Wednesday, December 18, 2019, 11:00 EST

From Hall A Wiki
Revision as of 11:56, 18 December 2019 by Dalton (Talk | contribs) (Agenda)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Back to Main Compton Page >> Compton Meetings

1. Dial Toll-Free Number: 1-888-240-2560 (U.S. & Canada)
2. International participants dial:
Toll Number: 1-408-740-7256
3. Enter meeting ID:140287970

Desktop sharing: 


Meeting room = Cebaf Center F227


  • (still) Need to pick new meeting time - fill out Doodle poll
  • BPM offsets for laser table BPMs not yet loaded into epics

Electron detector

  • Detector status
  • QWAD adapter boards
  • Counting DAQ


  • Cavity/laser status

Photon Detector

  • Backgrounds at high current


  • Too busy for analysis!


Dave, Adam, Alex, Amali, Bob, Mark, Cip, Jinlong, JC, Kent,

  1. General
    1. 1pm on Wednesday seems like the best time with one response still needed.
  2. Electron Detector
    1. Detector: Hooked up to French electronics. Wait for beam to test.
    2. QWADS: Only 1 good one available. Can test by triggering on the photon. If it works then we can consider taking modules from Hall C.
    3. DAQ: A lot of work done by Bran, Brian, Jinlong and Iris.
  3. Laser
    1. PPLN output is now roundish and small enough to couple well.
    2. Cavity power up to 4 kW!!
    3. Cavity is unstable though, looses lock.
      1. Try lowering the input power by rotating the HWP.
      2. Try looking at laser power on short timescales when lock is lost.
  4. Photon Detector
    1. Test at 150 uA on 48Ca: we should be able to run a full gain. Laser off rates are 60 kHz, assumed to be from neutrons. No target out data was taken.
    2. Power on collimator was below the predicted 1/3 of PREX (simulated with 5x5 mm raster but we're running with 2x2 mm raster.)