Beam Modulation

In the process of editing and updating this page. Please contact Juliette Mammei crowder@jlab.org with questions or suggestions.

PREX Main << Expert Tools

How to Run Beam Modulation

• First, make sure Coda is running

• You need to be logged in apar account on adqa3:

  •  ssh apar@adaq3 

• Go to directory:

  •  cd /adaqfs/home/apar/vowen/BMWClient/PyGreenMonster/ 

• Run beam modulation code:

  •  python3 ProductionModulation_Pause10Min.py 

• 1. Beam modulation will automatically run for 7 days
  2. In order to quit beam modulation

     •  control+c 

       to crash out of the beam modulation program.

     •  python3 gm_bmw_clearall.py 

       to clean up the DAQ records and release the EPICS FFB pause states.

Modulation online plots

Task for the analysis shift expert:

For each run, 

• Check the online plot ( the top plot on the BMW plot page), we should see all 7 coils (colorful bars) at least for one super cycle (one bunch). If not, check the beam trips, if this run has a lot of beam trips, then check the other more stable runs. If you still miss one or more coils, then please call Ye: 803-553-3570.
• Check the online plot ( on the BMW Cycle page ).

• BMOD meetings
• Beam Modulation Documentation Portal

Beam Mod Corrections

• Dithering slopes extraction

Getting Started

First, you will need to find the slopes that you will use to perform the correction.

1. Login to the apar account on aonl2: ssh apar@aonl2
2. cd ~/PREX/prompt/beam-mod/scripts
3. If you haven't done a "gojapan" yet then source setup_japan.tcsh
4. Choose a list of runs that you would like to analyze and put them in a file called "filename.list"
   • To analyze a slug, choose the corresponding list in ~/PREX/prompt/collector/run_list/
5. Next, run ./dit_runlist.sh filename.list