BMOD 06142019
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PREX Main << Expert Tools << Beam Modulation << Meetings
Logistic information
BlueJeans calling instructions: Toll-Free Number (U.S.& Canada): 888-240-2560 International toll number: 408-740-7256 Bluejeans CODE: 348 778 076 Bluejeans link: https://bluejeans.com/348778076 Offline room: CEBAF Center F324-325
Agenda
- Introductions
- Overview - Victoria
- Status - Ye
- Controls - Tao
- Aggregator - Sakib
- Documentation needed
- meeting times
Minutes
- 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
- meeting times
Attending: Juliette, Paul, Victoria, Ye, Tao, Sakib, Quinn, Dave Armstrong, Zeke