Difference between revisions of "Thursday, September 29, 2016, 10:00am EDT - Compton"

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(→‎Photon Detector)
 
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=== Photon Detector ===
 
=== Photon Detector ===
−
* Detector installation
+
* Detector installation and DAQ (Update from Juan Carlos and Abel)
−
** Update from Juan Carlos and Abel
+
** PbWO4 and Tungsten Collimator system on table
 +
** Collimator system controller reachable from network (need to ask network people to provide DNS records)
 +
** Checked limits of table motion
 +
*** Maximum height (y-position) now ~29 mm (this is down from 39 mm during Spring running). At 30mm foam touches top plate.
 +
**** However, we presently cannot reach ideal height due to interference of PMT connectors and a bolt from top plate.  Will attempt to rotate or adjust detector to clear it.
 +
*** Will need to find an elbow HV connector to prevent accidentally bumping HV cable on the back of the table.
 +
** Aluminum collimator left open (1cm radius) and removed old sync shield.
 +
*** Still have enough room to insert the smaller Al-collimator if needed.
 +
** Camera temporarily "taped" to top plate. Want to get a clamp to better secure it.
 +
** Integrating mode DAQ brought back to life (finally).
 +
*** Had issues with some missing signals/cables but managed to track them all down.
 +
*** PMT triggers (for snapshots, etc..) works, but Pulser triggered (min-Megan) still needs work.
 +
*** Once Spring DAQ up and running like normal, will test new CRL file for fall running.
  
 
=== Electron detector ===
 
=== Electron detector ===

Latest revision as of 23:07, 28 September 2016

*********BLUEJEANS CALL-IN INSTRUCTIONS*********
----------------------------------------------------
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:
https://bluejeans.com/140287970

Agenda

Meeting room=F228 in Cebaf Center

General

  • Ole is getting serious about turning off compton-old
    • I've copied some stuff to /home/compton/compton_old on the new machine
    • Check and see if there's anything I've missed that you think is important (Alexandre...)
    • VNC and StripTool now working
  • Simulation: unified GEANT4-based Monte Carlo update
  • Alignment was done last week. Laser table was several mm low --> likely due to replacement of laser table leg valve.

Laser

  • Removed 5 W fiber amplifier and handed off to Shukui (Injector group) - he says it's working "fine," but hasn't looked at it with fast photo diode
  • Installed 30 W amp
    • Polarization direction found
    • Producing 1-1.1 W at nominal 5 W out of fiber amp (similar to what we were getting before when things were working well).
    • Not yet able to lock - tried to reproduce configuration and settings from previous running; no luck. Perhaps PZT response different for this seed laser?

Photon Detector

  • Detector installation and DAQ (Update from Juan Carlos and Abel)
    • PbWO4 and Tungsten Collimator system on table
    • Collimator system controller reachable from network (need to ask network people to provide DNS records)
    • Checked limits of table motion
      • Maximum height (y-position) now ~29 mm (this is down from 39 mm during Spring running). At 30mm foam touches top plate.
        • However, we presently cannot reach ideal height due to interference of PMT connectors and a bolt from top plate. Will attempt to rotate or adjust detector to clear it.
      • Will need to find an elbow HV connector to prevent accidentally bumping HV cable on the back of the table.
    • Aluminum collimator left open (1cm radius) and removed old sync shield.
      • Still have enough room to insert the smaller Al-collimator if needed.
    • Camera temporarily "taped" to top plate. Want to get a clamp to better secure it.
    • Integrating mode DAQ brought back to life (finally).
      • Had issues with some missing signals/cables but managed to track them all down.
      • PMT triggers (for snapshots, etc..) works, but Pulser triggered (min-Megan) still needs work.
      • Once Spring DAQ up and running like normal, will test new CRL file for fall running.

Electron detector

  • Detector in Hall
    • FSD and "photon stopper" valve: need to test masking
    • Measured noise still ~ 20 mV. Too large
  • QWAD tests: JLab (Hoskins/Camsonne)
  • QWAD tests: Manitoba

Minutes

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