View source for Minutes Jan2012 to Mar2012


<B>2/15/2012</B>: 
Present: Jixie, Min, Kalyan, Pengjia, Ryan, Melissa, Jie, Karl, Vince, Alex, JP, Aiden, Doug, Moshe

*JP, Karl:
1) We will have daily meeting in the 2nd floor of the counting house @ 4:15 PM from next Monday. <br>
2) Aiden will be the 1t run coordinator and he will book the meeting room. <br>

*Doug:
1) GEP will change to 6 deg 5.01 target field. No 2.5T target field for GEP now.

*Vince, Ryan, Jie, Melissa:
1) 70% of the electronics do not work any longer due to accident that the voltage pin switched <br>
in the power supply. Good news is that we have some spare electronics and know how to replace them.<br>
2) Left HRS DAQ will be rebuilt in the rest of this week. <br>
3) Remote rest on ROC1 is ready

*Moshe:
1) Working of GEP simulation.

*Pengjia:
1) Show beam position [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/02152012/Beam_Position_Reconstruction.pptx reconstruction plan]. 

*Min:
1) Tuning quardroples for both arm with snake. A report is [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/TuneQuads/QuadTune-02152012.pdf here]. Try to finalize them this week. 

*Chao:
1) A write up about the g2p helicity is ready [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/20120215/G2PHelicityStatus.pdf here]. 

*Jixie:
1) TOSP for target field measurement is ready for signature. It has been printed out and handed to Chris Keith.<br>
2) Got new septum tosca map (reduced gap) from Robin.  Will update G4 simulation and simulate the acceptance change.<br> 
3) Will update optics plan. <br>

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<B>2/8/2012</B>: 
Present: Jixie, Min, Kalyan, Pengjia, Ryan, Melissa, Jie, Karl, Vince, Alex

*Toby:
1) Target installation is going well. Pumping the vacuum right now. <br>
2) Will work on selecting output tree leaves for the replay program, under help from Vince. <br> 

*Vince, Ryan, Jie, Melissa:
1) Working on scaler scripts.  Will put some useful parameters into mysql database. <br> 
Alex can help to set up mysql database. <br>
2) The 3rd fastbus crate for R-HRS is now under installation. <br> 
3) Vince reported that 2 of the 3 fastbus crates of the L-HRS saw only 4.7v (instead of 5v) from <br>
the power supply, while the other saw 5v. All these 3 crates connected to the same power supply.<br>
4) Remote power cycling for the happex crates is available now. See the detail [http://hallaweb.jlab.org/halog/log/html/1202_archive/120207175758.html here].<br> 

*Min:
1) Tuning the quadrapoles for R-HRS.

*Pengjia, Chao:
1) Finished the helicity test, both gave a report. Pengjia's report is [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/02082012/happex_asym_report.pptx here].<br>
Chao's report is [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/20120208/Chao_WeeklyMeeting_02082012.pdf here].
2) In pengjia's report, he found that there will be double peak problem if connect V2F while copying <br>
BCM signal. Need to spend some time to understand it. <br>

*Jixie:
1) TOSP for target field mapping was sent out for another review. <br>
2) Updated simulation geometry: adding aluminum top, back and bottom plates to surround local dump.<br> 
the platform was also added. This update is mainly for simulate the radiation damage on septum coil.<br>
3) Simulation result of adding shim into septum will be found [https://hallaweb.jlab.org/dvcslog/g2p/159 here].<br>

*Kalyan:

1) Will coordinate another beam charge asymmetry test with hall-C and moller again when beam is available. <br> 
2) Working on puting lumi into the happex adc in the R-HRS. Need to change the ADC from voltage mode to <br> current mode. <br>

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<B>2/1/2012</B>: 
Present: Jixie, Min, Kalyan, Pengjia, Ryan, Melissa, Jie, JP, Vince, Alex, Aiden

*JP:
1) Decided to add 2 one-inched shims into septum. May cost additional 3 days of installation. <br>
2) New design of the chicane finished. Will be machined soon<br> 
3) Traget field direction is of importance, especially for GEP. Need target group to check this before run. <br> 

*Pengjia, Chao:
1) Working on the helicity issue

*Min:
1) Finished [https://hallaweb.jlab.org/dvcslog/g2p/157 VDC T0 calibration]. <br>
2) Analyzed the 600A septum data, looking for the elastic peak. See details [https://hallaweb.jlab.org/dvcslog/g2p/158 here].<br>
3) Tuning Right quadrapole. Need to turn to John for help <br>

*Toby:
1) Finished irradiating 16 cells of NH3 target at NIST. In total we have 24 cells now. See details of these<br>
cells [http://hallaweb.jlab.org/experiment/g2p/collaborators/toby/g2p_material.pdf here]. <br>
2) Scattering chamber installed onto the platform. Target insert also installed. NMR tested.

*Ryan, Vince, Jie:
1) Need a serial cable for LHRS ROC5 VME5100 CPU<br>
2) Jack will install the 3rd fastbus crate for R-HRS <br>
3) Happex DAQ does have a way to reboot remotely. However the subnet for the hareboots belong to MCC, not Hall A. Need to <br>
change it to Hall A subnet or add additional reboot switches. <br> 

*Melissa:
1) Updated wiki by adding 'expert shift' section, check details [https://hallaweb.jlab.org/wiki/index.php/G2p_Expert_Shifts here].<br>
2) Looking into the 2nd peak issue of the TDC of S2m in both L-HRS and R-HRS <br>

*Jixie:
1) TOSP for target field measurement already sent out for review<br>
2) Simulated septum acceptance after adding 2" shims <br>
3) Updated simulation geometry for accurate radiation damage simulation<br>
4) Test artificial beam charge asymmetry with moller polorimeter. Check result [http://hallaweb.jlab.org/equipment/moller/raw_results.html here]. <br> 


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<B>1/25/2012</B>: 
Present: Jixie, Min, Kalyan, Pengjia, Ryan, Melissa, Jie, JP, Vince, Alex

*Pengjia:
1) Try to test the helicity and beam charge asymmetry with artificial signal  <br>

*Melissa:
1) Analyze the double peak issue in GC's for both spectrometers. The 2nd peak (small one) comes from single PHE <br>
events, which hit the edge of the mirror. Check [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/TDC/cerTDC.pdf here]
for details. <br>

*Ryan:
1) Finished the [http://hallaweb.jlab.org/experiment/g2p/collaborators/rbziel/Deadtime_g2p_12512.pdf model] to predict the dead time. <br>

*Vince, Jie:
1) Working on remote reset for HAPPEX DAQ. Bob mentioned it might already exist, suggests to double check. <br>
2) Jack plans to installed the 3rd fastbus crate for R-HRS <br>

*Kalyan:
1) Bogdan said that the the resistor should not be used in the filter for ADCs. Need to double check before removing them out.<br>

*Min:
1) Learning how to tune quadruples. check her xls sheet [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/TuneQuads/ here].<br> 

*Jixie:
1) Preparing the TOSP for target field mapping <br>
2) Writing the final OPTICs plan. <br>
3) No more septum field measurement is needed. TOSCA model is proved to be wrong. With current setting, 1000 A <br>
power supply current can run only 2.32 GeV.  Need to increase the current otherwise will lost several kinematics points.<br> 

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<B>1/18/2012</B>: 
Present: Jixie, Min, Kalyan, Pengjia, Toby, Ryan, Melissa, Jie, JP, Vince, Alex, Chao Gu

*JP:
1) Javier is writing the readiness review report, will be ready soon. There is no major <br>
issues, just a few small questions and recommendations. <br>  
2) All documents have to be ready by Feb. 3rd, 2 weeks before start date. <br>
3) Another irradiation will take place at NIST next week. Toby, Chao and Pengjia will be<br>
the candidates to help over there. 3 of them and all students should try to learn the target<br>
as much as possible and become experts<br>
4) There will be 4 tests during g2p run. Gas CC test for A1n,  gas CC and PMT test for SOLID,<br>
GEM test and MRPC test. <br>

*Vince, Jie:
1) Left VDC is now turned off for installation of gas bubblers. <br>
2) Checked the remote reset for all left and right HRS crates. HAPPEX does not have a remote reset yet.<br>
3) Jack will install a 3rd fastbus crate on the Right HRS<br> 
4) Left HRS FASTBUS reset is not working. Jack will work on it once parts have arrived.<br>

*Melissa:
1) Found double peaks on GC TDC distribution for both Left and Right HRS commissioning data. <br>
Need to spend more time to isolate those event and study it. <br> 

*Kalyan, Ryan, Pengjia, Chao, Toby:
1) Ryan is creating a model to predict the dead time for HRS DAQ. Most of the dead time came from the HAPPEX<br>
DAQ, which cannot run in buffer mode. <br>
2) Pengjia showed the result of beam position determination. The project is trying to predict the beam <br>
position at the target by fitting it as function of position at BPM1 and BPM2. In the result raster is not <br>  
considered yet. Pengjia will also calculate the systematic uncertainty of it.<br>
3) Chao and Toby showed the beam asymmetry measured by Hall C,  which is about 5%. Their analysis shows that <br> 
the same measurement from Hall A is about 2%. After deep discussion in the meeting, we came to a realize that<br>
there could be a hardware problem or a decode problem in the helicity DAQ. Pengjia will have to find out a<br>
way to debug the DAQ. Chao and Toby will continue communication with Hall C and also debug the decoding part. <br>
4) Chao reported that the remote control for 3rd arm discriminator is ready <br>
5) Toby reported that one of the target nose have problems and was sent back to machine shop. Target group found<br> that the longitudinal entrance flange restrict to GEP to run the beam at 7 degrees.<br> 
6) Kalyan mentioned that the on-line prediction of helicity state should not be always on. It might affect <br> Qweak( need to find out how).  We will have to have a switch and run it in short interval only for diagnosis. <br>   
7) Vince and Chao will following the DAQ problem of the strategy in reading scaler. <br>
In order to clean the ring buffer which is filled up quickly, the DAQ will have to read then clean it <br>
frequently such that there is always buffer to fill new signals. However, the scaler is now coupled with<br> 
ring buffer therefore each time the ring buffer is read, the scaler (much larger data stream in size) will <br>
also be read.  This make the DAQ slow.  The solution is to decouple scaler with ring buffer and also read <br>
scaler not so frequently. Once per second might be good enough.<br>

*Min:
1) Tuning the quadrapole in SNAKE. After tuning, the central ray still have 2 mm shift in Q1 aperture. <br> 
This shift might be acceptable. Min also need to consider the change in acceptance during tuning<br>
2) Preparing the solid angle acceptance for Karl using the commissioning data.  <br>

*Jixie:
1) Need to check the optics run plan again to determine if we need straight through beam for all beam energies<br>
all run plan should be ready by Feb 3rd. <br> 
2) Need to check with Ed if we need to operate the sieve by our own <br> 
3) Preparing for the target field mapping need TOSP  <br>
4) Study the central ray angle for the septum field map again. Found that the center ray is 2.902+/-0.001 GeV/c <br> and the angle is 5.65+/-0.004 degree. (The old result is 2.956 GeV and 5.69 degree.) <br>
5) Preparing for septum mapping. Need to cooperate with Jack. The 1st measurement shows that there is a 20%<br>
deviation from the tosca model. The data also proof the real field is lower than tosca. Robin already found some<br> 
bugs in the tosca. Need to communicate with her and try to get this problem solved. <br>  

  
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<B>1/11/2012</B>: 
Present: Jixie, Min, Kalyan, Pengjia, Toby, Ryan, Melissa, Jie, JP, Karl, Vince, Alex

*Karl, JP:
1) Discuss if we need straight through beam for each energy. (optics needs this setting)<br>
2) 4-channeled BPM was told to be ready in one week

*Toby:
1) Doing lumi analysis, might need to put lumi into the ring buffer is one want to know the <br>
beam asymmetry<br> 

*Chao, Kalyan:
1) Setup 3rd arm DAQ to support buffer mode <br>
2) Working on the remote control for the discriminator <br>
3) working on decide the helicity in HAPPEX DAQ <br>
4) Show [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/20120111/ plots] from the septum measurement<br>

*Jixie:
1) Present simulation [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/20120111/ results] for answering questions of the safety review <br>  

*Jie:
1) working on the remote control for ROCs

*Melissa:
1) Looking at the [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/multitrack.pdf multiple tracks events] in the commissioning data <br>

*Pengjia:
1) Do we need to turn on the helicity prediction on-line?  How much will it slow the DAQ? <br>
Pengjia will study the affect then discuss again. <br>
2) Fitting the BPM1 and BPM2 positions to predict the beam position at the target. Not finished yet.
   
*Min:
1) Show her analysis for the commissioning optics data and the septum measurement [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/SeptaItune_01112012.pdf results] <br>

*Ryan, Vince:
1) Removing 2 TDC from roc5, reduce teh busy time from 90 to 60 us.  <br>
2) Found that the DAQ has defects in strategy to control reading the scaler data, which make it slow. <br>
In order to clean the ring buffer which is filled up quickly, the DAQ will have to read then clean it <br>
frequently such that there is always buffer to fill new signals. However, the scaler is now coupled with<br> 
ring buffer therefore each time the ring buffer is read, the scaler (much larger data stream in size) will <br>
also be read.  This make the DAQ slow.  The solution is to decouple scaler with ring buffer and also read <br>
scaler not so frequently. <br>

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<B>1/4/2012</B>: 
Present: Jixie, Min, Kalyan, Pengjia, Toby, Ryan, Melissa, Jie, JP, Karl, Vince, Alex, Aiden

*Karl, JP:
1) Readiness review will be taken place in Jan 17. All documents are expected to put to this <br>
location by next Tuesday: http://hallaweb.jlab.org/experiment/g2p/meetings/safety_011712/ <br>
2) Need new ESAD,COO,RSAD,etc  for this review <br>
3) Discuss the charge asymmetry issue. Finally agree to let hall c to control the feed back. <br>
We will dedicate someone to watch it closely. Charge asymmetry should also be monitored for each<br>
run by the 3rd person.
   
*Kalyan, Chao:
1) Working on remote control to 3rd arm discriminators <br>
2) Will prepare document for 3rd arm <br>
3) Karl suggested to consider the secure the HV cable for safety reasons <br>
4) Chao show the helicity stutus. He has compared the helicity from the trigger to scaler, they <br>
agree with each other. Need to work on the decoding the helicity from HAPPEX DAQ  then made another <br>
comparison. <br>

*Jixie, Min:
1) Measured the target foil position. Also talked to survey group and figured it out already. <br>
2) Updating the geant4 simulation with commissioning configuration. <br>
3) Analyzing the optics data. <br>
4) Will talked to John and learn how to tune quadrapoles again dipole. <br>     
5) Septum block might have some orientation, or the HRS angle is not correct. Ed has requested 
a new survey for them.<br>

*Alex, Pengjia:
1) Working on BCM|BPM. Analyzing the linearity.

*Jie:
1) Working on the remote control to IOC.

*Ryan:
1) Shown his analysis of the HRS [http://hallaweb.jlab.org/experiment/g2p/collaborators/rbziel/DT.pdf deadtime]. <br>

*Toby:
1) Analyzing the lumi data. Two channels (#4,#8) did not response. <br>

*Melissa:
1) Finished up efficiency check for CC, EC. Both > 99%. <br>
 
*Aiden:
1) A new graduate student from MIT will come in about Jan 16. Need to find some project for him. <br>