BMOD 06142019

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

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PREX Main << Expert Tools << Beam Modulation << Meetings

Logistic information

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 Offline room:   CEBAF Center F324-325

Agenda

• Introductions
• Overview - Victoria
• Status - Ye
• Controls - Tao
• Aggregator - Sakib
• Documentation needed
  • From Expert Tools
  • From Documentation Portal
• meeting times

Minutes

Figure 1 - Summary and status of BMOD prep filled in during meeting. Red is needed; green is good to go.

• Introductions
• Overview - Victoria
  • detector response to changes in beam
  • sequentially move in set of directions (beam modulation)
  • detector yield vs. <beam position> => slopes
  • partial derivative of bpm (or detector) vs. driving coil => sensitivities
    • correlation plot or fit -> matrix, allows to calculate the slope
  • regression on natural beam motion also
• Status - Ye and Victoria
  • coils work, know which direction
  • don't know whether positive current means a certain direction
  • modulation controls - sends current to coils, pause FFB
  • know which BPMs, and which work (tested during APEX)
    • x motion the noise of the beam seemed larger
    • probably because of energy lock not being on
    • BPM12X at a location - should have large correlation with energy
  • don't know for a given coils - position and angle of beam (at target)
  • 5 BPMS 4AX, 4EX, 12X,
  • 3 x coils, 3 y coils - which is best to do analysis (Ye)
  • coil 1 and 3 for x may be different for PREX tune
  • Need a plan - Victoria will write it and circulate it
  • modulated data in main rootfile with a lot of branches
  • can make a special rootfile for only modulated data
  • "stuff" in the data stream indicating FFB paused, coils modulating, etc. - flags
• Software - Tao
  • Generic tools for analysis - multiple runs
  • calculating the slopes from cycles vs. runs from incomplete supercycles
  • more robust if data-taking is not ideal
• Aggregator - Sakib
  • Tao's scripts in aggregator
• Documentation needed
  • From Expert Tools
  • From Documentation Portal
• meeting times

Attending: Juliette, Paul, Victoria, Ye, Tao, Sakib, Quinn, Dave Armstrong, Zeke