View source for Minutes July2011 to Dec 2011

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<B>11/30/2011</B>: 
Present: Jixie, Min, Kalyan, Pengjia, Toby, Ryan, Melissa, Jie, JP, Karl,Vince, Alex, Aiden

*JP, Karl:
1) Don will do another cool down at UVA from Dec 8 to 16. Toby will be there to help for the whole <br>
period. Chao will go there and help from 8 to 12 and Jie will help from 12 to 16. <br>   
2) We will have the analysis meeting every day at the meeting room located in the 2nd floor <br>
of the counting house from next Monday till the end of the commissioning.<br>
3) Karl sign each component with manpower, check the wiki for details 

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<B>11/23/2011</B>: 
Present: Jixie, Min, Kalyan, Pengjia, Toby, Jie, JP, Karl
*Karl and JP:
1) Commissioning will take place from 12/12 to 12/22, straight through beam, C12 target. All subsystems <br> 
are supposed to be ready by 12/9. <br>
2) Software for BPM will not be ready for this commissioning. Old SCE readout electronics of the BPM will <br>
be installed. They are supposed to work at beam current no lower than 100nA. <br> 
3) Chicane, target and local dump will not be tested. <br>
4) About shift: cancel all shift in Jan. and early Feb.  Allow user to sign up shift for the real run. <br>

*Toby: 
1) In the irradiation event in NIST, 2-3 cups of target material have been irradiated. Don plan another cool <br>
down at UVA at early December.<br> 
2) The hall b magnet is already in the machine shop, waiting for machining.<br>

*Pengjia:
1) Gave a status update of the scaler and Intel CPU: see details [d here]. <br>

*Min and Jixie: 
1) Gave a update of the "sieve to target" reconstruct. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/11232011.pptx here]. <br> 
2) Min will provide the self consistency check of this reconstruction for single beam energy version and also <br> combined beam energy version next week. <br>
3) Bremsstrahlung damage study: Jixie got the equivalent damage tables for n,pr,pi and e- from FLUKA. Will <br> implement them into the Geant4 program. Here is a [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20111123_RadDamage/Damage.png plot] of the damage as a function of momentum. Check [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20111123_RadDamage  here] for more details.<br>  


*Jie:
1) Learning the G4 program.

*Chao and Kalyan: 
1) Started work on magnet shield for 3rd arm PMTs, waiting for rubber collar to fix the inner tubes <br>
2) Hardware for DAQ is almost done. Working on decoding. Will work on online monitor scripts later. <br>

*Ryan, Melissa:
1) An update of the HRS status can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/rbziel/Deadtime.pdf here].


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<B>11/16/2011</B>: 
Present: Jixie, Melissa, Min, Kalyan, Alex, Ryan, Jie, JP, Karl

Pengjia, Chao and Toby went to NIST helping target irradiation.

*JP: 
1) In the coming commissioning, 1,3 or 5 passes beam will be available for Hall A.<br>
The beam energy is about 580 MeV per pass, we prefer to 3 pass beam. <br>
2) Need to write the TOSP for the commissioning.

*Kalyan:
1) Working on the HV crate. 
2) Bogdan suggested to replace all the TDC to 1877s. Need to evaluate how much work and how much risk <br>
it is to implement this upgrade.

*Jixie, Min :
1) HRSMC v0.99 released.  In this version, HallB magnet geometry and field is built in. Full size <br>
scattering chamber is built. The local dump stand is also in position. <br>
2) Talked to Jack about measuring the septa field.  Jack still working on the power supply, might be <br>
ready next week. Jixie need to get the TOSP ready as soon as possible. <br>
3) Finished checking the tosca map with the fortran routine for the HallB target magnet. They match each<br>
other very well. <br>
4) Studied the homogeneity of the hallb magnet. See the figure [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20111116_HallBCoil/Homo_HallBTgField_RZ.png here].<br>
Compare this coil to the SANE coil, see plot [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20111116_HallBCoil/Tg_SANEVsB.png here]. <br>
5) HallB field data map for snake is ready. Download it [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20111116_HallBCoil/snake_targetfield.map here]. <br>
6) Working on a new model for sieve to target reconstruction.  The one from MUDIFI is not good at all. <br>
Trying to improve it with new fits. <br>
7) We would also like to have optics runs in the commissioning. Those runs will be used to improve the <br> reconstruction based on MC data. Need to know the target position before hand.

*Alex:
1) Commissioning todo list (run plan) is already in the Elog, see entry [https://hallaweb.jlab.org/dvcslog/g2p/143 143] and [https://hallaweb.jlab.org/dvcslog/g2p/144 144] for details. <br>

*Jie:
1) Learning to run the G4 program.

*Ryan, Melissa:
1) EDTM for left arm is working now. <br>
2) Run left HRS in buffer mode. Found 40% dead time. Will investigate this issue in the rest of this week.<br>


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<B>11/09/2011</B>: 
Present: Jixie, Melissa, Min, Kalyan, Alex, Vince, Ryan, Jie

Pengjia, Chao and Toby went to NIST helping target irradiation.
Alex  is still working on the commissioning plan.
 
*Kalyan:
1) Prepare to move 3rd arm DAQ behind the green wall <br>
2) Setting up the helicity scaler gates <br>
3) Decided to use the beam line HV crate <br>
4) Making magnetic shielding for PMTs <br>
5) Trying to improve the reconstruction matrix from sieve to target <br>

*Jixie, Min:
1) Posted the optics discussion and TODO list in [Elog https://hallaweb.jlab.org/dvcslog/g2p/136] <br>
2) Put HallB coil geometry into the G4 model, field module also ready to use. <br>
3) Working on compare the TOSCA model with the routine from Peter Bosted <br>
4) Running simulation for GEP to determine the magnetic angle, (Urgent! need to finish by Thursday) <br>
5) The bremsstrahlung result can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20111108_Brem here] <br>

*Jie:
1) Learning to run the Geant4 program

*Vince, Ryan,Melissa:
1) Jack finish install the 3rd fast-bus crate for left arm. Ryan updated the crate map and <br>
took cosmic run to check left HRS DAQ <br>
2) Melissa continue her work on identify the source of low efficiency of right shower. She found that
there is 1~2 blocks of shower give low signal. She will spend more time to look into this.
3) Vince, Alex, Ryan will meet with Bob in Thursday to plan a DAQ rate test.  This test is trying to <br>
learn how much will be the improvement after install the 3rd fast-bus crate.  They might test it again once<br>
Pengjia finished installing the HAPPEX crate into the left HRS.


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<B>11/02/2011</B>: 
Present: Jixie, Melissa, Min, Chao, Pengjia, Kalyan, Alex, Vince, Toby, JP, Aidan, Ryan, Jie, Yawei Zhang

*Alex: 
1) Got permission to use Hall-B magnet, will be ready around mid Feb. <br>
2) Will have commissioning from 12/9 to 12/24  <br>
3) will work out the commissioning plan then determine the shift schedule <br>
4) Need to finalize the GEP angle. 7 +/- 2 degrees are all acceptable. <br>
Jixie will put the geometry into the G4 model and help to finalize that<br>

*Kalyan, Chao:
1) Find out a way to disable any channel of the ADC for the 3rd arm DAQ. After disable some unused channels,<br> 
The DAQ rate can go to 9k Hz in the pulse test. <br>
2) Found the pedestal threshold for ADC <br>

*Jixie, Min, Chao:
1) Got some Hall-B coil drawings, also got a fortran routine to calculate the field from Peter Bosted. <br>
Click [https://hallaweb.jlab.org/dvcslog/g2p/135 here] to download them. <br>
2) Will add the geometry and field to the Geant4 modle <br>
3) Will have optics meeting tomorrow from 2:30 to 3:30 right after target meeting at A110. All is welcome to join.<br>
4) Finalize the synchrotron radiation at Chicane: when the photons energy reach 50keV, the rate drops below 1Hz. The<br>
photos came form the 1st magnet will not be able to hit the target because they are blocked by the 2nd magnet. Those <br> 
photons came from the 2nd magnet will not hit the target neither.<br>
5) Still working on the bremsstrahlung radiation within the scattering chamber <br>
6) Min is running the simulation for optics <br>
 
*Pengjia, Jie:
1) working on installing the intel CPU with HSR DAQ <br>
2) Jie is test the ADC of HAPPPEX DAQ for Left and Right HRS <br>

*Ryan:
1) Checking preshower|shower to make sure it works. <br>

*Toby: 
1) Work with target group.  Took HallB magnet chamber down and shipped to EEL building.  Will cut it and take the <br>
magnet out soon. <br>
2) continue learning the G4 <br>

*Melissa:
1) check the preshower|shower using Xgt2 data. Found the one in right HRS have low efficiency(as low as 97%). Vince mentioned<br>
this could be due to the low electron momentum (~0.8 GeV). Melissa will check it with high energy data set. <br>

*Vince:
1) Jack is working on adding a third Fastbus crate for left HRS.  When he finishes, Vince will work on checking the left HRS DAQ with the new crate.
  
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<B>10/26/2011</B>: 
Present: Karl, Jixie, Melissa, Min, Chao, Pengjia, Kalyan, Alex, Vince, Toby, JP, Aidan, Ryan

*Karl: 
1) There is an update to the G2P schedule. The start date of this experiment could be middle of Feb (not official date yet). <br>
We have to give up the 12.5 degree runnings. <br>

*JP:
1) Discussed the g2p commissioning before the target is ready. We can do a lot of detector and DAQ test.<br>   
2) There will be 2~3 irradiation carried out at NIST. 3 students will go to learn and help.  Pengjia and Toby <br>
will go. There 3 person could be rotated among students. Chao volunteer to go. <br> 

*Kalyan, Chao:
1) Test the 3rd arm detector with source (Cs137, average momentum is 150keV, maximum about 500keV). <br>
2) 3rd arm stand is assembled in the hall. <br> 
3) keep working to the DAQ, need to find a way to subtract the pedestal in VME. <br>
4) Chao report [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/WeeklyMeeting10262011.pdf the calibration] <br>

*Jixie, Min:
1) Built chicane into the Geant4 simulation, see 3D plots [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20111026_Syncrotron/HRSMC_v0.98_p05/ here] <br>
2) Show the study about the synchrotron radiation at chicane. Here is a [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20111026_Syncrotron/SynchrotronRadiation.pdf document] about the details of synchrotron. <br>  
According to our calculation, the radiation power of all beam energy at chicane magnet B1 is about 20~30 micro-watt.<br>  
Jp suggested to calculate the rates for high energy photons which will tell if it will affect the physics result. <br>  
3) Still working on the bremsstrahlung radiation at target chamber <br>
4) Min reported the [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/102611-opticsSimu.pdf optics status]. <br>
5) Pengjia told that we can use the slow raster to change the beam position during cross scan for optic runs. This will <br>
have only 5 minutes of change over, which can save lot of time. JP suggested to check with Yves Roblin about that. <br>

*Pengjia:
1) Put ADC back to happex daq with voltage mode. <br>

*Ryan, Melissa, Vince:
1) Working on the HRS DAQ.  <br>
2) Bogdan agreed to fix the bad PMTs on the left HRS Cherenkov detector <br>
3) Bogdan requested 2 plots for lead glass: "pedestal vs channel" and "cosmic peak vs channel". Ryan will provide them. <br>
4) Vince set up a separate DB for the Right HRS CODA, which solves the platform interference problem. <br>

*Toby:
1) Working with target group <br>
2) Learning the G4 program <br>
 
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<B>10/19/2011</B>: 
Present: Karl, Jixie, Jie, Melissa, Min, Chao, Pengjia, Kalyan, Alex, Vince, Toby, JP, Yuxiang Zhao, Yawei Zhang, Yi Zhou
*JP:  
1) Update of the target:  2 places of short to ground found.  Will need to open the coil package for deep <br> 
diagnostics.  2 more weeks of delay is expected if we plan to fix the short to ground problem. <br>
2) Looking for feasibility of using the magnet of Hall B.  There is lot of constrain to use this magnet.  A delay of <br>
2 month will be expected if use it. <br>

*Karl: 
1)Readiness and safety review will take place next Monday, 1 PM.  Everybody are welcomed to attend and <br> 
support us.  Check [https://hallaweb.jlab.org/wiki/index.php/G2p_safety_102411 here] for details. <br>

*Toby:
1) Presented the [http://hallaweb.jlab.org/experiment/g2p/collaborators/toby/g2p%20meetings/10.19.11/scalers.pdf scaler map]<br>
2) Determined the beam incline angles at target center for various settings using Geant4 program HRSMC with<br> 
NEW target field.  The vertical and horizontal offset of the beam at 1.1 meter away from the target center are also <br> 
extracted. Check [http://hallaweb.jlab.org/experiment/g2p/collaborators/toby/G4%20Plots/ here] for figures. <br>

*Jixie:
1) Presented some [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20111019_Readiness/ figures] prepared for the readiness review, including beam spot at local dump, 'flame of sheet', etc... <br>

*Melissa:
1) Re-did the analysis for the HRS gas Cherenkovs.  Three channels in the left arm seem to have a low number of photoelectrons, <br>
check [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/Cherenkov_Analysis.pdf here] for details. 
Need to report to Bogdan and request for replacement. <br>

*Pengjia:
1) Reported the HAPPEX DAQ status.  Check his [https://userweb.jlab.org/~pzhu/report/Happex%20DAQ%20Status%2010.18.2011.pptx talk] for details.

*Vince:
1)  Figured out the reason for CODA interference of left HRS and right HRS.  The platform uses an account name to identify <br>
the database.  Both the left and right HRS use the same database name: adaq.  Therefore killing the right HRS platform will also <br>
disconnect the left HRS run control.  The solution is to change the user account for the platform to run the right HRS DAQ.


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<B>10/12/2011</B>: 
Present: Karl, Jixie, Jie, Min, Chao, Pengjia, Kalyan, Vince, Toby, JP, Yuxiang Zhao
*Karl:
1) In order to improve students' skill of doing presentation, we will have 2-3 students each week to give <br>
feature presentation about what they are doing in the part weeks. <br>
2) Latest schedule can be find [https://hallaweb.jlab.org/wiki/index.php/G2p#Runplan.2FSchedule here]<br>

*JP:
1) Target status update: <br> 
A) There is enough space to put the sodium pad into the coil container <br>
B) Found about 2~3 short grounded place in the coil. Not clear if can fix them all. Waiting for suggestion from Oxford<br> 
C) Try to get Hall B Helmholtz coil and make it work for the experiment in the meanwhile (2 magnet are prepare in parallel).<br>   
2) Running schedule have been officially changed to Dec. 1st <br>
3) 2-channeled BPM has been tested in hall C and works now. 4-channeled BPM is expected to finish design in 2 more weeks.<br>

*Jixie, Min:
1) A preliminary draft of optics plan can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/OpticsRate2.pdf here], still need to run more simulation to check some items <br>
2) Jixie is working on the simulation for bremsstrahlung photons and other safety review related items <br>

*Vince, Ryan, Melissa:
1) Ryan gave a nice report of the DAQ status, check [http://hallaweb.jlab.org/experiment/g2p/collaborators/rbziel/DAQ_STATUS.pdf here] <br>

*Pengjia, Jie:
1) optimizing the HAPPEX ADC module <br>
2) The "buffer full" issue in the HAPPEX DAQ is suddenly gone after recalling. The reason is not figured out yet.<br> 

*Toby:
1) Finished the scaler <br>
2) Worked with Pengjia in optimizing the TDC which is using an Intel CPU <br>
3) Learning the geant4 program <br>

*Kalyan, Chao:
1) Test E plane PMTs with cosmic rays, check the details [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/E_CosmicRay.pdf here]


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<B>10/05/2011</B>: 
Present: Karl, James, Jixie, Jie, Melissa, Min, Chao, Pengjia, Kalyan, Aiden, Vince, Toby, JP, Yuxiang Zhao, Yawei Zhang, Yi Zhou, Zhao Zhang
*Karl:
1) Welcome James joining g2p! James will working on the target related projects for this experiment <br>
2) Latest schedule is available [https://hallaweb.jlab.org/wiki/index.php/G2p#Runplan.2FSchedule here]<br>
3) Encourage all users to upload documentation to this [https://hallaweb.jlab.org/wiki/index.php/G2p#Documentation location] <br>

*James:
1) Got permission from Oxford that the target coil can be cut and opened for investigation. The coil <br>
is now in machine shop. <br>
2) Will work on target operator training procedure and put it on the wiki. Will also arrange target <br>
operator training sessions. <br> 

*Kalyan, Chao:
1) Finished gain match (HV adjusting such that each PMT will have the same peak location) for dE planes using <br> cosmic ray, will do this to the E planes. <br>
2) Try to optimize the DAQ rate to reach 10k Hz. <br>
3) Will do the OSP for the 3rd arm. <br>
4) Show the dE planes gain match result [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/dE_ADC.pdf here]. <br>

*Jixie, Min:
1) Run elastic simulation with C12, CH2, LHe and Al targets for all possible combination configurations of <br>
beam energies, target field and HRS angles. Calculate the elastic rates for w/o sieve. Also calculate rates for<br>
some single sieve holes.  Check the details [https://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20111004_Optics here]. <br>
2) The 1st draft of the optics plan is [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/OpticsRate.pdf here]. <br> 
In this draft, no changing time is considered yet. Will improve this draft and update it. <br>
 
*Vince, Melissa, Ryan, Toby:
1) Problem of CODA script: killcoda on adaql1 will also cause the run on adaql2 to end, need to find the reason <br> and solve it. <br>
2) After installing an Intel CPU in ROC 1, the right HRS does not get any triggers.  Vince will help Ryan and Pengjia <br> investigate it after the meeting.<br>
3) Ryan reported the S1 bad PMTs to Bogdan. Some more figures were requested to prove these PMTs are really bad. <br> He will generate figures for that. <br>
4) Melissa will redo the fit to Cherenkov NPHE with new fitting function (Gaussian+Poisson). She has also redone the <br> fits for the SPE.  With the improved analysis the NPHE will be higher than previous fit. <br>  
5) Toby is working on scalers. He needs to verify their connections to both HRS and make sure they work including the <br> helicity-gated scalers. <br>

*Jie:
1) The 2nd version of [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2011_10_05_fieldmap_report/Target_Field_Map_Report.pdf field analysis note] is ready for review. <br>

*Pengjia:
1) Connecting HAPPEX crate to Left HRS, (not finish yet) <br>


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<B>9/28/2011</B>: 
Present: Karl, Jixie, Jie, Melissa, Min, Chao, Pengjia, Kalyan, Alex, Vince, Toby, JP, Yuxiang Zhao, Yawei Zhang
*Karl:
1) Target coil quench protection part will be opened today or tomorrow for investigation. 
 
*Kalyan, Chao:
1) 3rd arm daq: have 1 ADC and 1 TDC working so far. Working on the scaler right now. Will make a copy <br> of ADC and TDC for backup. <br>
2) Tested the dE plane ADC signal with cosmic ray. The trigger is the coincidence of 2 dE planes. The <br> [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/ADC.pdf figure] shows that PMTs in the left<br> have narrower signal compared to those in the right.  Need to check reasons for that.  <br>

*Jixie, Min:
1) Updated the Gean4 program HRSMC to support titled beam simulation. A uniform field model have been<br> coded to correct the incident angle of the incoming electron. The effective scattering angle will be<br> calculated and the elastic scattering energy then will be determined based on the effective scattering<br> angle. Here is a [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20110928_SieveSlit/HRSMC_v0.98.png picture] of current version.<br>
2) Simulated the elastic events with C12, CH2 and liquid Helium target with sieve slit in position. <br>
50 mil, 100 mil and 200 mil thick of C12 have been simulated. Check details [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20110928_SieveSlit/ here].<br>  
The result shows that for 1.2 GeV beam, elastic peak of C12 will be overlapped with that of helium.<br>
3) Considering the fact that the uncertainty of deltaP between H peak and C peak is dominated by H peak, <br>
(in other words, the overlap of C peak and He peak will not be the major source of uncertainty), we <br> 
will not warn up the target during optics.  <br>
4) The optics plan is still under discussion. Min is working on snake and mudifi to verify the plan. <br>
Min also show a few [https://hallaweb.jlab.org/wiki/index.php/Image:OpticsII-0928.pdf slices] about that. <br>
5) G2P work disk will be upgraded to 1T space from 14:30. 

*Jie:
1) Work with Pengjia on HAPPEX DAQ project.<br>
2) HAPPEX crate has been merged with the right HRS DAQ.

*Vince, Ryan, Melissa:
1) Took cosmic data for the left and right HRSs. <br>
2) Left HRS, checked S1 PMT signals for after-pulsing issue. About four PMTs have a large amount of after-pulses, bars 5 and 6. <br>
3) Found that the ADC amplitude of some of the PMTs is very low. Will compare to cosmic data in the Spring to find out if the low amplitudes existed then. <br>
4) Initial conversation with Bogdan resulted in him requesting more plots for the ADC amplitudes. Melissa is making those plots now.<br>
5) We probably need to replace the PMTs.  However, Bogdan only has about half the PMTs for both S1 detectors (left and right). <br>
(Those PMTs are out of production, we may need another solution.) <br> 
Check the details [http://hallaweb.jlab.org/experiment/g2p/collaborators/rbziel/s1_pmt_check.pdf here].<br>


*Toby:
1) Working on the coda scripts. <br>
2) Updated the root to version 5.28 in the farm for analyzer.  Ole has updated the root for adaq machines<br>
to 5.30. Toby will update the root to this version too. <br>

*Pengjia:
1) HAPPEX DAQ works for right HRS. Working on making another copy to left HRS.  Will check the dead <br>
time on the HRS DAQ due to adding the HAPPEX crate
 

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<B>9/21/2011</B>: 
Present: Karl, Jixie, Jie, Melissa, Min, Chao, Pengjia, Kalyan, Alex, Vince, Toby, JP, Yuxiang Zhao, Yi Zhou, Zhao Zhang 

*Pengjia:
1) Copied HAPPEX DAQ (HARDWARE) into the right HRS and got it work. <br>
2) Tungsten colorimeter is still under testing by Arne's student. We was told <br>
that it need two more weeks to finish.<br>
3) Show a few [https://userweb.jlab.org/~pzhu/report/Helicity%20setting.pptx slices] about the helicity signal that will be used during in g2p.<br>

*Kalyan:
1) Working on 3rd arm DAQ.  It is basically working right now. Doing the test with dE plane. <br>
2) Worked with Whit(Engineering group) to design the support of the magnetic shielding.  <br>
The shielding material has been ordered. <br>

*Jixie:
1) Working on the simulation of C12, LHe, CH2 and LH2 with sieve slit in position.  Trying to finish <br>
the reconstruction code and verify if the we can separate the elastic peak of C12 from that of LHe. <br> 
Check [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20110921_SieveSlit here] for details. 
This [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20110921_SieveSlit/SieveHole33_5.69deg_E1.159_combined.png figure] shows the CH2 elastic peak at 1.159 GeV beam energy. <br> 
The momentum elastic peak of helium and Carbon start to overlap after energy loss. Note that the momentum are not <br> reconstructed momentum.  Smeared be the VDC resolution and reconstruction resolution, these 2 peak will overlap even more. <br>

*Min:
1) Working on mudifi to fit Geant4 sieve slit data for target field reconstruction routines<br>
2) Tuning the snake field map <br>

*Jie and Toby:
1) The target field measurement with translation table [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2011_09_21_fieldmap/Target_Field_Map_Report.pdf analysis note] is ready for group review. <br>

2) The target field measurement on can surface [https://hallaweb.jlab.org/dvcslog/g2p/131 analysis note] is also ready for group review. <br>
Toby also show some figure [http://hallaweb.jlab.org/experiment/g2p/collaborators/tbadman/g2p%20meetings/09.21.11/finalreport.pdf here.] 
 
*Melissa, Vince and Ryan :
1) Working on HRS DAQ. The DAQs for both arm are basically working. <br>
2) Melissa Updated start_coda script such that it starts left HRS DAQ on adaql1 and right HRS DAQ on adaql2<br>
3) Took cosmic run with left HRS. Will take cosmic run for right HRS soon. <br>
4) One rack keep losing power, Jack will take care of that <br>
5) A couple HV channels were tripping for S2m, the HV card was suspected and replaced. <br>
6) Ryan also looked into S1 and S2m TDC signal, some channels looks abnormal. 
Need to spend more time checking that. <br>

*Chao: 
1) Working on 3rd arm DAQ with Kalyan. Will do pedestal run soon.
2) Measure the sieve slits for hole positions. They are all match the design.

*Alex:
1)Working on test the intel CPU in DAQ.


----

<B>9/14/2011</B>: 
Present: Karl, Jixie, Jie, Melissa, Min, Chao, Pengjia, Kalyan, Alex, Vince, Toby

*Kalyan:
1) Working on 3rd arm DAQ with Chao <br>
2) The magnetic shielding (netic cylinder + co-netic foil) order has been placed <br>

*Jixie:
1) Shift schedule is ready to sign. Called for checking the description. Karl suggested not to <br> 
open the 2nd period for user now. For those who have signed shifts in the 2nd period we will honor <br>
them the shifts they signed. <br>
2) Working on the TOSP for septum field mapping <br>
3) Compare SANE TOSCA map with our NEW TOSCA map together with Oscar. Could not find the reason. <br>
4) Running simulation to check optics plan <br> 

*Alex:
1) Try to use intel CPU to replace the CPU board. 6~10 kHz DAQ rates is expected. <br>

*Vince:
1) Working on HRS DAQ with Melissa and Ryan; Roc3 is now not running <br>
2) Check the lumi HV crate, one channel keep tripping off. (Nothing we can do so far) <br>
3) Plan to change the Left HRS HV operation interface as the one used for the right arm. <br> 

*Min:
1) Prepare for optic plan <br>
2) Working with Pendjia for helicity signal in the HAPPEX DAQ <br>

*Jie:
1) Writing tech note for field measurement with translation table <br>
2) Working with Pendjia for helicity signal in the HAPPEX DAQ. Made a [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2011_09_14_DAQ/Delay_time.pdf comparison] of time delay for
3 modeules. <br>

*Melissa:
1) Show the pre-shower|shower analysis [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/preshower:shower%20calibration.pdf result]. <br>

*Ryan: 
1) Working on left HRS ROC3. Took the structure fastbus interface from BigBite, but it does not work in roc3. <br>
Will try to use an old CPU. <br>

*Toby:
1) Updated the G2p  wiki with README (instruction) for replay <br>
2) Writing the tech note of the target field measurement on the can surface <br> 

*Pengjia:
1) Tested the dead time for various DAQ configurations. Check Elog entry [https://hallaweb.jlab.org/dvcslog/g2p/129 129] for details. <br>

*Chao:
1) Working on 3rd arm DAQ with Kalyan<br>
2) Glued the broken dE plane scintillator <br>


----
<B>9/7/2011</B>: 
Present: Karl, Jixie, Jie, Melissa, Min, Chao, Pengjia, Kalyan, JP, Alex, Vince,Toby, Yi Zhou, Yuxiang Zhao

*Karl:
1) The draft of run schedule is available [https://hallaweb.jlab.org/wiki/index.php/G2p#Runplan.2FSchedule here].  <br>
2) Discuss the safety and OSP|TOSP document issues

*JP:  
Welcome 2 USTC visiting scholar Yi Zhou and Yixiang Zhao. They will work on GEM and SOLID projects.<br>

*Jixie:
1) Agree to work on the TOSP for septum <br>
2) Discuss the shift schedule and related things. Collaborators need to take 10 shifts to fulfill<br>
the authorship requirement.  Collaborators is not allowed to take TO shifts until got trained or<br> agree to receive the TO training well before shift starts.  <br>
3) Will talk to Oscar to find out the difference between old TOSCA and new TOSCA map for the target field. [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20110907_ThirdArm/targetfile_cmp.png Here] is the figure showing the difference between these models.<br>
4) Design the magnetic shielding for the 3rd arm PMTs. Need to block 70 gauss field. Current chosen thickness, 0.062 inch, is over designed. <br> 

*Min:
1) Reading tech notes and thesis. Prepare for optic plan.

*Kalyan:
1)Remind the student that helicity signal in the HRS is delayed <br>
2)Setting up DAQ crate for the 3rd arm <br>
3)Working on the magnetic shielding  <br>

*Jie:
1) Show his field analysis [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2011_09_07_fieldmap/ result]

*Toby:
1) Not finalize his field analysis result yet, will show the result later

*Melissa:
1) Looking into the HRS s1 & s2m TDC, check Elog [https://hallaweb.jlab.org/dvcslog/g2p/128 entry 128] for details <br>
2) Check the Cherencov TDC spectrum, see Elog [https://hallaweb.jlab.org/dvcslog/g2p/127 entry 127] for details <br>
3) Still working on checking shower|preshower TDC <br>

*Chao:
1) working on 3rd arm simulation<br>
2) working on 3rd arm SC, made a holder and will glue it at the rest of this week<br>

*Pengjia:
1) Ring buffer for HAPPEX DAQ works for helicity signal in the left arm. Will work on the right arm soon
 

----

<B>8/31/2011</B>: 
Present: Karl, Jixie, Jie, Melissa, Min, Chao, Pengjia, Kalyan, JP, Alex, Vince

*Jixie:
1) Working on optics plan with Min. Need to recalculate e-C and e-H elas rates for 5.7 deg 2.5T. <br>
2) Confirm septum polarity before Howard connect it to the power supply <br>
3) Will perform B vs I curve for septum in middle Sep.  Chao and Min will join, Toby too. <br>
4) Karl suggest get (from Doug) the long cable which is used to connect to the hall probe. <br>
5) Will simulate what thickness will be good for a mu-medal to shield low energy protons. <br>

*Kalyan:
1) Working on the 3rd arm DAQ with Chao. <br>
2) The dE plane of the 3rd arm is 6'(width) x 12'(height) in size, not 12 x 12. This is found <br> 
after it was opened. Chao will need to peel off the remainder glue and reglue it.  Jixie will <br>
check with Al about this change. <br>
3) Kalyan agree to following replacing PMT for S1L2 (check minutes of Aug. 17 for detail). <br>
   
*Vince:
1) Will join G2P and work on HRS DAQ. A 3rd crate might be added in order to improve DAQ rates. <br>
2) Will following the issue of HV crate of Lumi. (check  minutes of Aug. 17 for detail). <br>

*Min:
1) Working on optics plan with Jixie.<br>

*Chao:
1) Working on the 3rd arm DAQ<br>
2) open the SC with Kalyan. Will clean the opened SC and glue it back tomorrow<br>
3) Need to run the simulation again for the 3rd arm using 6x24 size and latest design positions.<br>

*Melissa:
1) Checking on shower preshower. She will post her results to the elog.

*Pengjia
1) Make a [http://www.jlab.org/~pzhu/report/Happex%20DAQ%20for%20g2p%20experiment.pptx presentation] about the DAQ plan for BPM|BCM. <br>
After discussion we all agreed to put hardware into both left and right HRS crates such that each arm will have 
a complete DAQ system. <br>

*Jie:
1) Report that our measurement of the target field agree with the NEW tosca model with 1%. <br>
Check his results [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2011_08_31_fieldmap/field_map.pdf file1] [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2011-08-24_fieldmap/2011-08-24-fieldmap.pdf file2]. <br>  



----

<B>8/24/2011</B>: 
Present: Karl, Jixie, Jie, Melissa, Ryan, Toby, Kalyan, JP, Chao, Min, Pengjia

*Jixie: 
1) The tosca model from SANE group was proved to be different from the one Robin recently <br>
created. Check [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20110824_TgFieldAna/Helm_OldVsNew.png  this plot] to see how they vary. Both the field analyses from Jie and Toby also confirm that. Jixie will <br>
talk to Robin to verify this.  <br>
2) Working on the Optics with and Min. A discussion with Jin Huang is ongoing. <br>
3) The 3rd arm design is done. Karl mentioned that Al might have some small change in the design of <br> of the stand. Jixie will check this with Al. <br>
4) Jixie will check the neutron background with the shielding with Poval. <br>  

*Pengjia:
1) Got some progrss on the HAPPEX DAQ:  <br>
A) The ring buffer works with helicity signal now, will move on to ADC signal  <br>
B) Still working on the TCPIP program <br>
2) Compared the BPM|BCM signal of HAPPEX DAQ and that from the scaler. It looks like HAPPEX DAQ give <br> better resolution. Pengjia, Kalyan, Alex and Bob will make the final decision which one to choose. <br>
3) Arne's student is testing the tungsten colorimeter with an external heat source in the Hall. Pengjia
is watching on this.
4) There are 2 options to put BCM|BPM signal into the data stream: <br>
option A: use socket program to insert the signal into the ET ring; <br>
Option B: integrate the hardware into HRS crate; <br>
Pengjia will compare these 2 options then make a choice.<br>

*Min:
1) Working on the optics. Join the discussion with Jin and Jixie. See her report 
[https://hallaweb.jlab.org/wiki/index.php/Image:24082011.pdf here]

*Jie:
1) Show the difference between old tosca map and new tosca map of the target field. Also show the 
field analysis result. [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2011-08-24_fieldmap/2011-08-24-fieldmap.pdf Check details here]. <br>

*Toby:
1) Showed his field analysis [http://hallaweb.jlab.org/experiment/g2p/collaborators/tbadman/g2p%20meetings/8.24.11/results.pdf result] using the new target field. The current ratio from his result <br>
is consistent with Jie's result. But the position offsets still have some difference. <br>

*Chao:
1) Writing a tech note about the design of the 3rd arm with Jixie <br>

*Ryan:
1) installed S1 back to HRS, will connect the cables and DAQ <br>

*Melissa:
1) Practice the calibration of shower and pre-shower using xgt2 data <br>

*Kalyan:
1) Confirm that the trigger has been settled as the way we discussed in last meeting <br>
2) Confirm that the 3rd arm DAQ can go up to 10KHZ <br>



----

<B>8/17/2011</B>: 
Present: Karl, Jixie, Vincent, Jie, Mellisa, Ryan, Toby, Doug, Alex, Kalyan, Zhihong<br>
By Phone: Chao, Pengjia, Min

<B>Discussion about the trigger</B>
*Zhihong, Karl, Doug, Alex, Vince ... : <br>
1) The HV of 3 channels in the  (Left?) Cherencov  are too high, need to be adjusted; <br>
2) According to xgt2 data, the efficiency of S1 and S2 are still larger than 99% <br>
3) The 2nd PMT in the Ledt S1 (S1_2_L) need to be replaced <br>
4) S0 is already in the right HRS. We need to remove it <br>
5) The HV of 2 channels of the Lumi crate (Slot 15, #7 and #8) should not be turned on, <br>
otherwise they will cause the whole crate crashed;  <br>

<B>After 3) and 4) fixed, the trigger for G2P will be the same as the regular HRS trigger.  </B><br>

*Chao, Min, Pengjia:
1) Reported from UVA that the target have been cooled down and with 5T field on Tuesday, they are trying<br>
for 2.5T field today. <br>

*Karl:
1) Bodgan told that S1m will not be ready for G2p; <br>
2) Will organize rad.con.2 training and electrical lead training <br>
3) As discussed with Jixie we need to place hall probe in the tunnel of both septa,  encourage students <br>
to help Jixie in measuring "B vs I" curve for septum coils; <br>

*Jixie:
1)  Show the detection efficiency of the 3rd arm. It is about 85%. 
Check [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20110817_ThirdArm/InelasPrBg/ThirdArmEff_E2.257.png here] for details. <br>
The following table is the rate of the 3rd arm for current design: <br>
{|border=1
|- 
!Beam(GeV)   
!Mom_Range(MeV)  
!Hoffset(cm)  
!Voffset(cm)   
!Time(hours)    
|- 
|1.159       
|270~410         
| 6           
|0            
|9.5 
|- 
|1.706       
|320~460         
|0            
| 7         
|9.9    
|- 
|2.257       
|320~460         
|0           
| -4        
|7.1    
|}
Please note that the detector efficiency is not considered yet. <br>

2) Both of the 2 target field analysis from Jie and Toby shows that the current ratio is closed to 1.15.  Jixie will <br> 
talk to survey group for checking the position for mistakes.  Jixie also suggested Jie and Toby to compare the new target<br>
field map from Robin to the exist one. If we can not explain this 1.15 current ratio, we need to measure the field on the can surface again. <br>
3)Will measure the "B vs I " curve for septa when power supply ready.  We need 2 gauss meters and 2 probes to place in the septa<br>
during experiment. <br>
 
*Jie:
1) Found that the current ratio is about 1.15. Will check bug for Toby and try to improve the field analysis <br>

*Toby:
1) Found that the current ratio is about 1.14.  <br>
2) Will check bug for Jie's program and try to improve the result <br>

*Melissa:
1) Checking the ADC of preshower and shower <br>

*Ryan:
1) Will look into the HV problem mentioned above. <br>
2) Check the Y distribution at S1m to see if S1m will lose acceptance. This position is projected <br>
from the focus plane.  See the [http://hallaweb.jlab.org/experiment/g2p/collaborators/rbziel/YDistributions.pdf details here].<br>
Note: we will not be able to use S1m. <br>
3) Will clean the unnecessary cables for the HRS ; <br>


----
<B>8/10/2011</B>: 
Present: Karl, Jixie, Chao, Pengjia, Min, Vincent, Jie <br>
By Phone: Mellisa, Ryan, Toby

*Karl: 
1) Target is not cool down yet, still filling helium. Ryan, Toby and Mellisa are already there. <br>
2) Can not find 2 cm SC <br>
3) Got approved that we will have 12 days of 1.7 GeV beam (may be a old news to someone). <br>
4) Tried to extend to run the experiment during Christmas <br>

*Jixie:
1) Talked to Bogdan and Albert for 2cm SC. There is no EXTRA 2 cm SC that can be used for us. <br>  
2) Talked to Brad and Bob about 10K Hz DAQ rate with ADC. Both of them are said there need some <br>
efforts to make this happened. <br>
3) Finalized the 3rd arm design: <br>
A) Since 2cm SC is not available, we will switch back to 1 cm SC for the 1st plane;  <br>
B) The neutron shielding will be 30 cm thick and we will use the exist borated plastic; <br> 
C) The width of of SC plane will be extended from 6 to 8 inches; <br>
D) We will put a removable 2mm aluminum shielding to shield low energy background from the target.<br>
We will not use this shielding for 1.2 GeV. For 1.7 and 2.3 GeV, we will use it only if the DAQ rate<br>
can not reach 10k Hz<br>
E) We changed the detected energy range for 1.7 and 2.3 GeV. <br>

4) Calculated the maximum raster size (requested by Karl). It is ok to extended to 11 mm.
[http://www.jlab.org/~jixie/HallA/meeting/20110810_ThirdArm/RasterVsBeamAngle_D25.4mm.png raster size assuming 25.4mm target cell diameter]. <br> 
We will have the target cell diameter of 27mm, [https://hallaweb.jlab.org/dvcslog/g2p/125], which will allow to <br>
extend to 11.5 mm.

*Chao:
1) Simulated the 3rd arm. There is a bug in calculating the asymmetry. Need to recalculate the time<br>
2)After fixed the bug in the code, found the final position and rates: <br> 
Check details [http://www.jlab.org/~cg2ja/Chao_WeeklyMeeting_08102011.pdf here].

*Min:
1) Solve the snake problem in linux by using -fno-automatic option. <br>
2) Wrote a [http://hallaweb.jlab.org/experiment/g2p/technotes/E08027_TN2011_03.pdf note] about the optics discussion with Jixie. 

*Pengjia:
1) Will looking to the low current data taken during Xgt2 to check noise of adc in BCM|BPM <br>
2) Arne will test the tungsten colorimeter with heater some time next week <br>
3) The ring buffer is working, will move on to read ADC and helicity signal, and TCPIP program which <br>
will be used to communicated between the ring buffer and HRS DAQ <br>

*Jie:
1) Shown improved result. After optimizing the fitting ranges, the variation of data to tosca reduce to 3%,<br>
and the position offsets are all within 1 cm.  Check [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/fieldmap3.pdf | this] for details.<br>
----
<B>8/3/2011</B>: 
Present: Karl, Jixie, Chao, Pengjia, Mellisa, Vincent, Ryan, Toby, Jie 

*Karl: 
1) Organized student go to UVA to participant the target cool down

*Jixie:
1) The detector response function is ready in the Geant4 simulation program. <br>
[http://www.jlab.org/~jixie/HallA/meeting/20110803_ThirdArm/Edep_ElasPr.png | Energies deposited by elas proton] <br>
[http://www.jlab.org/~jixie/HallA/meeting/20110803_ThirdArm/n_EdepVsPid.png | Hits in neutron simulation] <br>
[http://www.jlab.org/~jixie/HallA/meeting/20110803_ThirdArm/n_Edep_E2.257.png | Total energy deposited by neutron.] 
(Please note that the top panel is still for the 2nd plane, not the 1st plane.) <br>
The energy deposited into the 2nd plane indirectly from the neutron is about 188 MeV per 100K 2.3 GeV electrons<br>
or 160 ns with 100 nA beam current. It turns out we must have the neutron shielding!

2) To shield the neutron, 20 cm thick plastic (Polyethylene) can block 80~85% of the neutron flux. <br>
Check detail here: [http://www.jlab.org/~jixie/HallA/meeting/20110803_FLUKA/] <br>

3) Third arm detector design: Al confirm that we can put 20 cm thick plastic shielding. <br>
The detector will be located 70 degrees, 2.1 meter away from the target. The SC plane size is 6'X 24', <br>
with rotation by the vector (r=1, theta=70, phi=0) about 36 degrees (for 5T target field) or 18 <br>
degrees(for 2.5T target field).  The 60 degrees of rotation about Y axis is not necessary since the shielding<br>
for neutron is in place. The first layer of SC will be 2cm, and the 2nd layer will be 5 cm or 2 inches. <br>
We need to find 2cm scintillator. The center position for each beam energies are the following: <br>
1.159  Horizontal_offset = 6 cm,  Vertical offset = 0 cm OR Horizontal_offset = 0 cm,  Vertical offset = 18 cm <br> 
1.706  Horizontal_offset = 0 cm,  Vertical offset = -21 cm <br>
2.257  Horizontal_offset = 0 cm,  Vertical offset = -15 cm <br>
The position can allow 1~2 cm off, and the angle can allow 2 degrees off. <br>
4) Have already inform Al with this design. <br>

*Chao:
1) Ran Geant4 simulation for the 3rd arm. Verified the rotation and position. <br>
2) Recalculate the rates. It will take about 14, 10, 7 hours to measure Pb*Pt to 5% uncertainty with 1.2, <br>
1.7 and 2.3 GeV beam. If we increase the SC wider it will shorten the time for 1.2 GeV but longer the time for<br>
the others due the the signal to background noise get worse. We still need to optimize the design. <br>

*Ryan:
1) Working on trigger on S1m <br>
2) Looked in the Y distribution of S0, it is about 15 cm, it seems ok for acceptance. 
[http://hallaweb.jlab.org/experiment/g2p/collaborators/rbziel/s1m_proj.pdf | Figure 1]
[http://hallaweb.jlab.org/experiment/g2p/collaborators/rbziel/s1m_proj_25.pdf | Figure 2]<br>
3) Got the timing module working after replacing the broken cables. Bob suggested to unplug HRS cable and reconnect them.<br>
4) Will work on the HOWTO wiki pages <br>

*Toby: 
1) Checked the probe with known field in the magnetic group with Jixie, Chao and Jie. Both the 3-axis probe and <br>
the axial probe seems within 1% accuracy. But we did not check the variance of the axial probe in rotation. <br>
Plan to do this in UVA.  <br> 
2) Determined the current ratio to be around 1.0. Jixie suggested to check again.

*Jie:
1) Improved the field analysis result. He analysis the data X_table=44 or X_table=46, which is most closed to the z axis. <br>
The new current ratio is 1.151, the position offsets are Xoff~=1.2 cm, Yoff=-0.5 cm, Zoff=0.4cm. Rotation and Xoff is not <br>
sensitive at all in this data set because the field is almost flat when x is closed to 0. <br>
Check the detail here: http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/fieldmap.pdf <br>
2) Will use large X data to fit for rotation and Xoff. <br>

*Min:
1) Tried to pull fortran routines from cern packages. But too many to pull! Jixie suggested stop doing this. <br> 

*Pengjia:
1) Successfully build the ring buffer to store BCM|BPM signal on HAPPEX DAQ <br>
2) Will post the target connection diagram which can help to understand the target cool down. Check Elog entry 124 <br>
for detail https://hallaweb.jlab.org/dvcslog/g2p/124 <br>


----
<B>7/27/2011</B>: 
Present: Karl, Jixie, Chao, Pengjia, Mellisa, Vincent, Ryan, Toby, Jie 
*Jixie: 
1)Neutron flux simulation.[http://www.jlab.org/~jixie/HallA/meeting/20110727_Neutron/try1 | details]<br> 
There will be about 1.3~1.5 neutrons for each 2.3 GeV electron hitting the local dump. <br>
For 6'x24' 3rd arm detector located at 70 degrees and 2.1 meters away from the target, <br>
there will be about 0.0012 neutrons per 2.3 GeV electron. If converted to rates, <br> 
it will be about 800 MHz @ 100 nA beam current.  This result has been confirm by a FLUKA program ran<br>
by Lorenzo Zana (who is checking the radiation for PREX2).<br>
''Jixie will work on shielding the neutron.'' 
2)Working on third arm simulation. [http://www.jlab.org/~jixie/HallA/meeting/20110727_ThirdArm |details ]<br>
If rotated the 3rd arm by Y axis with 60 degrees (the the SC plane will be 10 degrees with <br>
respected to X axis), we can have 3 advantages: <br>
A)reduce the neutron flux by a factor of 5 (=sin(70deg)/sin(10deg)) <br>
B)do not need to cut the scintillator plane <br>
C)effective thickness doubled and will have better ability to cut ADC for triggers. (need to simulate ...) <br>
But it require more space in the target platform. Need to check with Al <br> 

3)Can not understand how the neutron will affect the 3rd arm trigger without the detector response<br> 
simulation. Jixie will add detector response into the Geant4 simulation.

*Chao:
1) Working with Jixie on the 3rd arm simulation. Confirm the rotation angles and tried to find<br>
the best positions for each beam energies. <br>
2) Recalculated the rate for the 3rd arm.

*Jie:
1) Tried to improve the analysis on the target field <br> 

*Min:
1) Checked the self consistency of the HRS transportation packages. <br>
2) The SNAKE works only in SunOS but not. MUDIFI works on jlabl2 but not on jlabs3. It was assumed to<br> 
be the cernlib problem. Karl suggested to pull the needed fortran routines out of cern packages and <br>
build a stand-alone snake program. <br>

*Mellisa:
1) Finished checking the [https://www.jlab.org/~melissac/cherenkov_analysis.pdf Cherencov]. <br>
2) Will move on to check the ADC signal of pre-shower and shower. <br> 
 
*Ryan:
1) Checking timing for L1A (Level 1 acceptance)
2) Working on the trigger on S1m

*Toby:
1) Optimized the fitting range in the field analysis 


----
<B>7/20/2011</B>: 
Present:Karl, Jixie, Chao, Pengjia, Mellisa, Vincent, Ryan, Toby, Alexandre, Jie Liu

*Jixie:
1) The design of the 3rd arm:  <br>
A) We need to place the 3rd arm at 70 degrees, not 72. We also have to move the detector <br>
from 1.5 meter to 2.1 meter such that the local dump itself could block some background.<br>
B) [http://www.jlab.org/~jixie/HallA/meeting/20110720_ThirdArm/ThetaAcc_R1B2G5.png | Figure 1 ]
shows the hit positions on the SC plane. The distribution look like a rotated strip. <br>
In order to select a small range of theta, the SC need to be rotated to some angle. <br>
C) [http://www.jlab.org/~jixie/HallA/meeting/20110720_ThirdArm/ThetaAcc_N17.png | Figure 2 ]
and [http://www.jlab.org/~jixie/HallA/meeting/20110720_ThirdArm/ThetaAcc_removed.png | Figure 3]
show the hit position for protons within and out of the theta range. <br>
Please note that these protons are generated in a flat distribution of theta and Energy. <br>
they are not elastic proton. Jixie will run with elastic proton again to check the rotation. <br>
D) We might need to cut the SC from 12 inches width to 6 inches. <br>
E) JP mentioned that it might help if the SC plane be rotated about Y axis by 70 degrees. <br>
With this rotation the whole SC will have minimum cross section area facing the local dump. <br>
2) Still working on neutron flux simulation.

*Chao:
1) Simulate the 3rd arm detector located at various distance from the target (1.5, 1.75,2.0, 2.25 meter).<br>
The detector size in the simulation is 6' x 24'. According to his result the dilution factor is about 17% <br>
and the total time to accumulate 5% accuracy data is about 9 hours. <br>

*Min:
1) Check the no target field HRS transportation code

*Pengjia:
1) learning the HAPPEX DAQ

*Toby:
1) Show field analysis result on the can surface data set. After improve, the variation of measured field<br>
to the map are within 1%. But the position offsets are still in 2 cm level. This analysis used only point A <br>
position to calibrate all the data set, which leaves room for further improve. Jixie ask Toby to check <br>
the code carefully. <br> 

*Jie:
1) Show field map analysis. His result does not agree with Toby's.

*Ryan: 
1) Working on mapping the HRS HV.  Finish ROC3 and ROC4. Check Elog entry 122 for detail: <br>
https://hallaweb.jlab.org/dvcslog/g2p/121 <br>
2) Will work on DAQ with Alex <br>
3) Will check PMT signal for S1 and S2m <br>

*Mellisa:
1) Working of the safety documents which is drawn from SANE group. <br>
2) Checking the Cherencov, found the ADC for 1 photon-electron, but this result still need to be improved.<br> 

----
<B>7/13/2011</B>: 
Present:Jian-ping, Jixie, Chao, Pengjia, Mellisa, Vincent, Ryan, Toby, Alexandre, Jie Liu, Karl

*Mellisa:
1) Continue checking the Cherencov detector. Applied geometry cut to the ADC. She need to find out <br>
the ADC value that 1 PHE corresponding to. Check her plots in the Elog, Item 120: <br>
https://hallaweb.jlab.org/dvcslog/g2p/120 <br>  

*Toby:
1) Showed the preliminary result for the field map analysis with the can surface data set. Most data <br>
points are within 6% variation. But the position offsets are as large as 2 cm. 

*Jie:
1) Showed his result of the field map analysis. Most data points are with 10% variation to the <br>
TOSCA map. Jie's result does not agree with Toby's in position and current ratio. Both of them are <br>
requested to check their results more carefully.

*Pengjia:
1) Tried to build ring buffer in HAPPEX DAQ. Will do the tungsten calorimeter calibration in August. 

*Ryan: 
1)Looked into the HV for HRS <br>
2)Finish the splitter box. Check Elog entry 121 for detail: https://hallaweb.jlab.org/dvcslog/g2p/121

*Chao:
1) Tried to learn and run the Geant4 simulation for the 3rd arm.

*Jixie:
1) Looking into the neutron background data provided by Pavel.
2) Designing the 3rd arm.
 
----
<B>7/6/2011</B>: 
Present: Jian-ping, Kalyan, Jixie, Chao, Pengjia, Mellisa, Vincent, Ryan, Toby, Alexandre, Jie Liu

*JP: 
1) Discussed the run plan with QWEAK group, ask for 12 days for 1.7 GeV. Not be granted yet. <br>
Currently Hall C allow only 5 days, or If they are down then we can take the time for 1.7 GeV. <br>
The plan is still under discussion. <br>
2) If Hall B is not available, we need to be able to run 1.2 GeV. We should be very flexible and 
ready for changes. <br>
3) Karl has the readiness review available. Everyone is encouraged to read and comment. <br>
4) JP will leave from 7/22 to 8/17. Kaylan will leave to India from 7/8 to 7/29. <br>
Alex will on vacation from 7/23 to 8/11. Karl will be on site from 7/11.

*Min:
1) Just back from the summer school. Will continue working on the HRS package issues.

*Chao:
1) Taking the detector geometry into account, recalculated the background of the 3rd arm using the epc code.<br>
2) Discuss the 3rd arm design: 12 inch width will accept +/-4 degrees in theta. With such a wide <br>
range it will take about 16 hours to measure Pb*Pt to 5% accuracy. It is too long ...  <br>
3) Finish the target field measurement with Jixie and Toby. <br>

*Pengjia:
1)Leaning HAPPEX DAQ, will use it for BCM and BPM <br>
2)will do calorimeter test. The tungsten calorimeter will eventually used to calibrate BCM. <br>
3)Learning how the Harp work and how to use it to calibrating BPM. <br>

*Toby:
1) Finish Target filed mapping with Jixie and Chao. <br>
2) Working on analyzing the field mapping data. <br>
  
*Ryan:
1) Working on Left HRS trigger <br>
2) Will check the material of the target with Josh <br>

*Mellisa:
1) Checking the Cherencov detector in HRS. Tried to find how many photon-electron (PHE) each PMT has <br>
in the Xgt2 data set. She need to apply the geometry cut and try again.

*Jie:
1) Analyzing the filed measurement data.

*Jixie:   
1) Just Finished the field measurement with help from Chao and Toby. Pengjia and Jie also provide appreciable help.<br>
2) Measured the field in 2 ways. One is measuring the field on the can surface with an axial probe (borrowed <br> 
from Josh) fixed in a aluminum block. <br>
http://www.jlab.org/~jixie/HallA/meeting/FieldMeasurement/IMG_0804.JPG <br>
Another is measuring the filed with a 3-axis probe on the translation table. <br>
http://www.jlab.org/~jixie/HallA/meeting/FieldMeasurement/IMG_0800.JPG <br>
The survey group came to the target lab and survey some positions. Just got the survey data yesterday. <br>
Jie and Toby are working on analyzing the field map measurement. Jie is focus on translation table data set <br>
and Toby is working of the can surface data. <br> 
3) Talk to Pavel in the Rad. Con. group for the neutron background simulation. Pavel will provide <br>
the neutron distribution and model information such that Jixie will be able to work on radiation calculation. <br>

----
<B>6/22/2011</B>: 
Present: Kalyan, Jixie, Chao, Pengjia, Mellisa, Vincent, Ryan, Toby, Alexandre, Jie Liu

*Toby:
1) Tested 4 cables for the slow raster with Ryan <br>
2) Worked with Chao and Jixie to prepare to measure the target field

*Ryan:
1) Continue working on the HRS trigger

*Melissa:
1) Replaying xgt2 data. Looking at the pedestal of adc to find out if there are dead channels <br>
2) Updating the safety document for g2p based on the one used in SANE experiment
 
*Chao:
1) Preparing a computer in the hall for the DAQ of the 3rd arm
2) Preparing for the target field measurement 


*Pengjia:
1) Continue working on the remote control program for the function generator

*Kalyan:
1) Continue designing the 3rd arm <br>
2) Got confirmed from Al that 3rd arm can not be used in GEP
 
*Jixie:
1) Learning the optics from Nilanga, will meet with Vince to discuss the optics plan <br>
2) Tried to test the magnetize effect of the translation table. Replaced some steel bolts and nuts <br>
with plastic ones. Toby and Chao will make a coil to test the stainless steel. <br>
3) Running simulation to get local beam dump opening for Al.  But the HRS transportation routines
from Min do not work. <br>