Difference between revisions of "Beam Polariazation Measurement (How to)"

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<b>Back to main [[Moller]]</b>
 
<b>Back to main [[Moller]]</b>
 
=Polarization measurement with Hall A Moller polarimeter=
 
=Polarization measurement with Hall A Moller polarimeter=
−
Please, read these useful documents
+
Please, look at these useful documents
 
* [https://hallaweb.jlab.org/equipment/moller/docs/PawSlides.pdf Slides: DAQ signals and PAW analyzer output (pdf)]
 
* [https://hallaweb.jlab.org/equipment/moller/docs/PawSlides.pdf Slides: DAQ signals and PAW analyzer output (pdf)]
 
* [https://hallaweb.jlab.org/equipment/moller/OSP/20190219_moller_manual.pdf Hall A Møller Polarimeter OSP 2019 ] (need to update)
 
* [https://hallaweb.jlab.org/equipment/moller/OSP/20190219_moller_manual.pdf Hall A Møller Polarimeter OSP 2019 ] (need to update)

Revision as of 11:01, 8 April 2019

Back to main Moller

Polarization measurement with Hall A Moller polarimeter

Please, look at these useful documents

Check list before measurements

Helicity, BCM signals in Hall A Counting Room

Patch panel in Counting Room with cables going to the Hall A: 

Connector# Signals (all NIM level) (width)
4  - BCM signal for Moller (1us)   from VtoF unit (??) Dx10 
14 - Helicity signal       (33ms)   ----_____---
15 - QRT signal            (33ms)   ----_____----
16 - MPS signal            (200 us) ---__----     front with 1us ahead of front of Helicity signal

Helicity, BCM, 100kHz signals in Hall A Moller electronics rack

  • NIM Module type of PS757 (Fan in/out) in NIM crate of FADC electronics rack
 #input  Signals width
 1 Clock 100kHz  (50ns) 
 4 Helicity      (33ms)
 7 MPS           (200us)
  • ADC V792 in FADC VME crate:
 #CH 00  Helicity signal
 #CH 01  QRT signal
 GATE    1.5us after front of MPS signal, width=130ns
  • Check APERTURE THRESHOLD with digital multimeter on NIM 16ch discriminator module type of PS708 in NIM crate before old DAQ rack. 
 APERTURE THRESHOLD = -300mV (readout with digital multimeter)
  • Check calorimeter OFFSETs with digital multimeter on NIM modules type of PS748 in slot #1 and PS740 slot #2 NIM crate in old DAQ rack.
    • Dec 1, 2015 
 PS748 (slot #1) 
Ch #   OFFSET(mV)
  0    +11.
  1    +12.
  2    +11.
  3    +11.
  4    +12.
  5    +10.
  6    +10.
  7    +12.

  PS740 (slot #2) 
Ch #   OFFSET(mV)
  0    +18
  1    +22
  2    +14
  3    +15
    • Nov 25, 2014 
 PS748 (slot #1) 
Ch #   OFFSET(mV)
  0    +18.5
  1    +18.6
  2    +20.4
  3    +21.7
  4    +19.5
  5    +25.5
  6    +19.3
  7    +10.3

  PS740 (slot #2) 
Ch #   OFFSET(mV)
  0    +21.5
  1    +21.6
  2    +22.
  3    +21.5

Helmholtz coils power supply

Target motion

Start CODA Moller database (msqld)

Login to adaq1 (since January 2016 we have moved our old DAQ from adaql1 to adaq1) as moller and check if msqld daemon is running: 

 adaq1> ps -u moller | grep msqld

if output like that: 

 22600 ?        00:00:01 msqld

that means msqld is running.
If not, type to start it: 

 adaq1> run_daemon_db msqld &

CODA LED test run

Check Helicity signals and scalers data in CODA data file

In ~/paw/moller start paw.
To check helicity, QRT signals type in paw: 

 paw> exe run run=15623
 Run=15624 is attached to lun=21
 paw> nt/sca //lun21/1 nsca>0 50 1 ! itick itrig(1) itrig(6) itrig(8)

This is output for 30Hz helicity (pair): 

+-------+-------------+-------------+-------------+-------------+
| Event |   itick     |   itrig(1)  |   itrig(6)  |   itrig(8)  |
+-------+-------------+-------------+-------------+-------------+
|     2 |  11155369   | z'0'        | z'1'        | z'0'        |
|     5 |  11155373   | z'0'        | z'0'        | z'1'        |
|     8 |  11155377   | z'0'        | z'0'        | z'1'        |
|    11 |  11155381   | z'0'        | z'1'        | z'1'        |
|    14 |  11155385   | z'0'        | z'0'        | z'1'        |
|    17 |  11155389   | z'0'        | z'1'        | z'1'        |
|    20 |  11155393   | z'0'        | z'1'        | z'1'        |
|    23 |  11155397   | z'0'        | z'0'        | z'1'        |
|    26 |  11155401   | z'0'        | z'0'        | z'0'        |
|    29 |  11155405   | z'0'        | z'1'        | z'1'        |
|    32 |  11155409   | z'0'        | z'1'        | z'1'        |
|    35 |  11155413   | z'0'        | z'0'        | z'1'        |
|    38 |  11155417   | z'0'        | z'1'        | z'1'        |
|    41 |  11155421   | z'0'        | z'0'        | z'1'        |
|    44 |  11155425   | z'0'        | z'0'        | z'1'        |
|    47 |  11155429   | z'0'        | z'1'        | z'1'        |
|    50 |  11155433   | z'0'        | z'1'        | z'0'        |
+-------+-------------+-------------+-------------+-------------+

Where: 

 itick   -  VxWorks time ticks (set in ~/daq/coda2/crlppc/moller_onl.crl to 8.33mS)
 itrig(1) - ADC gate on input #1 of TIR board
 itrig(6) - Helicity signal on input #6 of TIR board
 itrig(8) - QRT signal on input #8 of TIR board

To check scalers data type in paw: 

 paw> nt/sca //lun21/1 nsca>0 50 1 ! itick isca(1) isca(2) isca(3) isca(4) isca(5)
+-------+-------------+-------------+-------------+-------------+-------------+-------------+
| Event |   itick     |   isca(1)   |   isca(2)   |   isca(3)   |   isca(4)   |   isca(5)   |
+-------+-------------+-------------+-------------+-------------+-------------+-------------+
|     2 |  11155369   |  9315       |  9315       |  9315       |  0          |  0          |
|     5 |  11155373   |  9463       |  9463       |  9463       |  0          |  0          |
|     8 |  11155377   |  9611       |  9611       |  9611       |  0          |  0          |
|    11 |  11155381   |  9760       |  9760       |  9760       |  0          |  0          |
|    14 |  11155385   |  9909       |  9909       |  9909       |  0          |  0          |
|    17 |  11155389   |  10057      |  10057      |  10057      |  0          |  0          |
|    20 |  11155393   |  10205      |  10205      |  10205      |  0          |  0          |
|    23 |  11155397   |  10353      |  10353      |  10353      |  0          |  0          |
|    26 |  11155401   |  10502      |  10502      |  10502      |  0          |  0          |
|    29 |  11155405   |  10650      |  10650      |  10650      |  0          |  0          |
|    32 |  11155409   |  10798      |  10798      |  10798      |  0          |  0          |
|    35 |  11155413   |  10946      |  10946      |  10946      |  0          |  0          |
|    38 |  11155417   |  11095      |  11095      |  11095      |  0          |  0          |
|    41 |  11155421   |  11243      |  11243      |  11243      |  0          |  0          |
|    44 |  11155425   |  11391      |  11391      |  11391      |  0          |  0          |
|    47 |  11155429   |  11539      |  11539      |  11539      |  0          |  0          |
|    50 |  11155433   |  11688      |  11688      |  11688      |  0          |  0          |
+-------+-------------+-------------+-------------+-------------+-------------+-------------+

Where: 

isca(1)  - Left arm (LG and Ap)
isca(2)  - Right arm (LG and Ap)
isca(3)  - Coincidence Left and Right arms
isca(4)  - Accidentals Left and Right arms
isca(5)  - BCM
isca(6)  - PLU out 7; in LED setup - number of LED flashes
isca(7)  - 
isca(8)  - 
isca(9)  - 
isca(10) - (Helicity delayed)*Clock(100kHz)
isca(11) - !MPS
isca(12) - PLU out #6 (TimerGenarator * helicity window)	
isca(13) - 
isca(14) - 
isca(15) - Clock TimerGenerator 100kHz

ADC Pedestals check

  • Set HV ON on moller detector. (Need link to HV ON)
  • Select configuration "moller_puls" in old CODA, download it.
  • In "mpc" programm load configuration "PULSER_SET" to detector electronics and start CODA run.
  • Take 3000-5000 events and stop run.
  • In ~/paw/moller start paw:
 > paw
 paw> exec run run=15627
 paw> exec lg_pedes run=15627 pulschk=1
  • Copy output results into text file with name "pedes_#RunNumber.dat", where #RunNumber is CODA "pulser" run.
  • Edit file "lg_spectra.kumac", replace:
 ...
 else
   ve/read pedes,pedcut pedes_14754.dat
 endif
 ...

with: 

 elseif [run]<#RunNumber then
   ve/read pedes,pedcut pedes_14754.dat	
 else
 ve/read pedes,pedcut pedes_#RunNumber.dat
   endif
 ...

Software to start

  • CODA
    • old DAQ ( data in /adaq1/data1/raw ): 
 ssh moller@adaq1  
 adaq1> start_coda
  • Detector settings and HV control GUI
 ssh moller@adaql2
 adaq2> cd Java/msettings/
 adaq2> mpc
  • FADC DAQ ( data in /data1/raw ) : 
 ssh moller@hamoller (open 3 terminals)
 hamoller> start_coda_fadc
  • FADC settings: 
 hamoller> cd crl/FADC/
 hamoller> gui_fadc_par
  • FADC online monitor:
 hamoller> cd fadc_online/mollmon/
 hamoller> mollmon -n moller25 -h hamoller
  • EPICS control
 ssh adaq@adaq1
 adaq1> monticello (OS Menu -> EDM -> Hall A -> HallA Moller polarimeter control)

OR 

 adaq1> jtabs (Beam Setup -> HallA-> Magnets-> Moller-> Combo)

Epics screens

Start JMenu (login to 'adaq1' as 'moller' and type): 

 jmenu

input password for user 'adaq'
Then select from JMenu:

  • Helicity Control
 JMenu->Beam Setup->Injector->Parity->Helicity Control
  • Moller Combo (Magnets Q1-Q4, Dipolem Solenoid (sup.cond.) control, Target motion control, )
 JMenu->Beam Setup->Hall A->Hall A Moller->Combo
  • Target Motion Control
 JMenu->Beam Setup->Hall A->Moller Measurements->Moller Target Control
  • BPMs position
 JMenu->Operations->Bpms->Hall A Absolute Spikes

or 

 JMenu->Operations->Bpms->Hall A Relative Spikes

Moller magnet settings and beam tuning

  • Ask target operator to remove the main Hall A target
  • Raster OFF
  • Moller magnet settings: (Q1,Q2,Q3,Q4, Dipole-OFF)
   1st Moller quadrupole magnet Q1 - MQO1H02 
   2nd Moller quadrupole magnet Q2 - MQM1H02 
   3rd Moller quadrupole magnet Q3 - MQO1H03
   4th Moller quadrupole magnet Q4 - MQO1H03A
   Moller dipole magnet            - MMA1H01
  • Get magnet settings for energy (as example) e0=7.37GeV
   paw> lcd mag_optim
   paw> exec sett_magp11 e0=7.37 	
   Eb=7.37GeV
   .       Q1          Q2         Q3          Q4         Dipole
   kG   -4.2742     -1.85808     1.994       4.345     10.8837
   kG*m -30791.3    -16358.5     14315.3     30839.5     1.78793E+06
   A    -197.853    -93.5748     97.3212     208.451     399.068
  • Ask MCC operator for beam current 0.5uA
  • Beam position tuning with magnet settings (Q1,Q2,Q3,Q4) on IPM1H01 BPM ~0.2mm (absolute X,Y)
  • Turn Beam OFF
  • Turn ON Moller Dipole
  • Ask Beam current 0.5uA
  • Beam position tuning with Dipole ON on IPM1H01 BPM ~0.2mm
  • Set Moller target on beam (as on March 15, 2019)
 1: Empty,  2: Fe 10.0um,  3: Fe 4.0um,  4: Fe 1.0um

Detector HV tuning

  • HV for Moller detector:
  portserver: hatsv5:2003
  slot #5: ch:(0-3) - Calorimeter Left  (1-4); 
	   ch:(4-7) - Calorimeter Right (1-4)
  slot #6: ch:(0-3) - Aperture Left  (1-4); 
	   ch:(4-7) - Aperture Right (1-4)
  • HV prediction (printout predicted HV calorimeter values for energy e0):
 paw> exec hvlg e0=7.3 set=0
  1. Tune detector HV
  2. Start CODA run
  3. Check signals peak position at ADC channel.
 paw> exec run run=15625
 paw> exec lg_spectra run=15625
  • Change HV for calorimeter in order to align the Møller peak position at ADC channel 300 for each block.
  • Repeat from #1
  • FADC DAQ: check signals peak position on online monitor 'mollmon'

Thresholds tuning

Polarization measurements

  1. Start dbedit on adaq1, select "mollerpol_l" database and set in "beam_pol" configuration table in row "code" parameter "adcevents" from 9 to 2: " ... adcevents=2"
  2. Make at least two CODA runs in order to use both coil polarities.

Data analysis

  1. old DAQ: adaq1:~/paw/moller/ 
      > paw
  paw> exec run run=15625
  paw> exec lg_spectra run=15625
  paw> exec time run=15625
  paw> lcd mag_optim
  paw> exec anpow_set e0=7.37 (E0 - beam energy in GeV)
  paw> lcd ..
  paw> exec asym19 anpow=0.7735 gate=0.033 run=15625 (gate=0.033 for 30Hz helicity frequency and gate=0.0008 for 1kHz)

    2. The above steps have been tested and are up to data as of November 17th, 2018 - Bill H.

  2. FADC DAQ: hamoller:~/fadc_analysis/moller_fadc-17Dec2015/ 
      > bash
  > source root-setup.sh
  > cd onlana
  > analyser
  analyser> replay_test(3023)
  analyser> .x do_analyse(3023)

Bugs To Fix in Software[1]

Results presentation

  • Results of all runs from "asym19" stored in files: runs.tab, res.dat
  • These files are not rewritable (just add new lines)
  • Do copy these files to paw/moller/meas:
 > cp runs.tab meas/runs.tab.#RunBeg-#RunEnd
 > cp res.dat meas/res.dat.#RunBeg-#RunEnd
  • 1. To plot and average results, edit file: ~/paw/moller/asym_avt.kumac
    comment old beam polarization data and add new one, modify output of 'ps' file and titles with date then run it.
  • 2. To plot and average results, run (plot is stored in file 'paw.ps'):
PAW> exec asym_avv run1=#RunBeg run2=#RunEnd

Spin dance

Troubleshooting

  • VME crates reboot
  1. Software reboot if VME crate is running:
    1. old DAQ hallavme5: 
      	  > telnet hatsv5 2004
  	  > reboot
	  Ctrl and "]"
	  telnet> quit

      2. Boot parameters of VME CPU (as on 26 Oct 2016): 

      VxWorks (for Motorola MVME2300 - MPC 604r) version 5.3.1.
Kernel: WIND version 2.5.
Made on Mar 25 1998, 08:54:04.

         boot device          : dc
   processor number     : 0 
   host name            : adaq1
   file name            : /adaqfs/home/moller/vxworks/vx2306_14
   inet on ethernet (e) : 129.57.192.31:ffffff00
   host inet (h)        : 129.57.192.102
   gateway inet (g)     : 129.57.192.1
   user (u)             : moller
   flags (f)            : 0x20 
   target name (tn)     : hallavme5
   startup script (s)   : /adaqfs/home/moller/vxworks/hallavme5_c4.boot


    2. FADC DAQ: 
      	  > telnet hatsv12 2005
  	  > reboot
	  Ctrl and "]"
	  telnet> quit

      Boot parameters of VME CPU (as on 26 Oct 2016): 

      VxWorks (for Motorola MVME6100-0163 - MPC 7457) version 5.5.1.
Kernel: WIND version 2.6.
Made on Feb 23 2009, 15:41:51.

          boot device          : geisc
    unit number          : 0 
    processor number     : 0 
    host name            : adaq1
    file name            : /adaqfs/home/moller/vxworks/vx6100_v4.1big
    inet on ethernet (e) : 129.57.192.55:ffffff00
    host inet (h)        : 129.57.192.102
    gateway inet (g)     : 129.57.192.1
    user (u)             : moller
    flags (f)            : 0x20 
    target name (tn)     : bbspare1
    startup script (s)   : /adaqfs/home/moller/vxworks/fadcmoller.boot
  2. Hardware reboot if crates not response:
    1. On adaq1 start firefox old DAQ hallavme5:
      Go to: http://hareboot26
      (outlet #3) 
      	  user: hlauser
	  select in "ON" box Outlet #3,	
	  select in small box Outlet #3,	
	  select Action "Reboot Immediatly" and
	  press "Next" button to activate menu.
	  press "Apply" button to activate action.

      Wait for few minutes while VME crate is rebooting.

    2. FADC DAQ crate:
      Go to: http://hareboot26
      (outlet #1) 
      	  user: hlauser
	  select in "ON" box Outlet #1,	
	  select in small box Outlet #1,	
	  select Action "Reboot Immediatly" and
	  press "Next" button to activate menu.
	  press "Apply" button to activate action.

      Wait for few minutes while VME crate is rebooting.

  • Moller target softIOC reboot
    You can reboot it from jtabs. Here are the steps: 
          ssh hlal00
    jtabs
    select Control System
    select Individual IOC and iocsofthamol
    select Reboot Reason first and then Reboot

    Or you can call MCC to have operator reboot it for you.

  • HV control
    HV GUI is running on adaq1 computer.
    To check measured voltages of detector go to directory and type 
      adaq1> cd ~/daq/coda2/scripts   
  adaq1> get_hv hatsv5:2003
    To disable or enable HV channels for Moller detector type: 
      adaq1> ch_ce.sh 0   (disable all channels)
  adaq1> ch_ce.sh 1   (enable  all channels)
  • Data analysis
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