Difference between revisions of "Compton Meeting, May 23, 2011"
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# Discussed the need for the new mount: the ability to align the optical axis of the GL and the rotation axis of the rotation mount. | # Discussed the need for the new mount: the ability to align the optical axis of the GL and the rotation axis of the rotation mount. | ||
| − | # Discussed the cavity power measurement. Electron detector group will do some analysis to see their sensitivity. | + | # Discussed the cavity power measurement. Electron detector group will do some analysis to see their sensitivity to this. We may want to revise how the power is measured. |
=== Photon detector === | === Photon detector === | ||
==== Replay ==== | ==== Replay ==== | ||
| − | # JC - working on BCM and BPM analyser code for replay | + | # JC - working on BCM and BPM analyser code for replay. BPM - waiting for commit from Paul - something will be out within the next week. Will allow absolute positions and position differences. Talked about the benefits of having the BPMs calibrated - a rough calibration should be sufficient. |
| − | # Dithering - we only have the flag since beginning of April. | + | # Dithering - we only have the flag since beginning of April but this should be enough to show that we aren't sensitive to the modulation. |
# Pedestals for replay, we will have long periods of constant pedestal for each detector-ADC combination. Mark to make plots of pedestal over time. Use 'beam off' pedestals. | # Pedestals for replay, we will have long periods of constant pedestal for each detector-ADC combination. Mark to make plots of pedestal over time. Use 'beam off' pedestals. | ||
| − | # Agreement that 'burst-mode' analysis not necessary for photon detector. | + | # Agreement that 'burst-mode' analysis not necessary for photon detector, will revisit later for electron detector. |
==== Detector ==== | ==== Detector ==== | ||
| − | # PMT in middle of 4 crystals, Hamlet found ice-box (Don to check if it fits), will mount 1 mm plastic fibers to reflect of mylar on the front (JC to talk to Vardan about this.) | + | # Summary of the separate meeting: PMT in middle of 4 PbWO4 crystals, Hamlet found ice-box (Don to check if it fits in beamline), will mount 1 mm plastic fibers from back to reflect of mylar on the front (JC to talk to Vardan about this.) |
# JC has Megan's paper on LED pulser linearity system and is beginning to work on it. | # JC has Megan's paper on LED pulser linearity system and is beginning to work on it. | ||
| Line 60: | Line 60: | ||
=== Electron detector === | === Electron detector === | ||
| − | # Busy organizing analysis into more systematic effort, DD says | + | # Busy organizing analysis into more systematic effort, DD says they plan to implement the suggestions here https://qweak.jlab.org/elog/DAQ+%26+Analysis/215 More in the next meeting. |
| − | https://qweak.jlab.org/elog/DAQ+%26+Analysis/215 | ||
Revision as of 13:36, 23 May 2011
Agenda
Doodle poll reminder
Laser
- Update on plans for laser work (Mark)
- Kent's Transfer function measurement note https://qweak.jlab.org/elog/Laser/93
- Designing mount for transfer function
- Summer intern (Brandon Cavness) arrives tomorrow
Photon detector
- Replay (wdc):
- On ifarml, aim for middle of June
- All resulting ROOT files will be stored on work disk
- Replay will include all macros as well
- Prereq: full BCM/BPM analysis
- Photon detector analyzer status:
- Scaler BCM/BPM read-out status (jc)
- What else? (excl. electron det)
- PbWO4:
- Summary meeting with Hamlet last Wednesday (kent/mark/dave/wdc)
- Dual pulser linearity test system (pulser logic) (jc?)
- DAQ summer plans:
- Increase data transfer speed to allow for more snapshots/longer sample windows
- Coincidence mode: What specs? Are we happy with what we have (Mark's accumulator mode response function)?
Electron detector
Attendance
Mark, Amrendra, Wouter, JC, Kent, DD, Don
Minutes
Laser
- Discussed the need for the new mount: the ability to align the optical axis of the GL and the rotation axis of the rotation mount.
- Discussed the cavity power measurement. Electron detector group will do some analysis to see their sensitivity to this. We may want to revise how the power is measured.
Photon detector
Replay
- JC - working on BCM and BPM analyser code for replay. BPM - waiting for commit from Paul - something will be out within the next week. Will allow absolute positions and position differences. Talked about the benefits of having the BPMs calibrated - a rough calibration should be sufficient.
- Dithering - we only have the flag since beginning of April but this should be enough to show that we aren't sensitive to the modulation.
- Pedestals for replay, we will have long periods of constant pedestal for each detector-ADC combination. Mark to make plots of pedestal over time. Use 'beam off' pedestals.
- Agreement that 'burst-mode' analysis not necessary for photon detector, will revisit later for electron detector.
Detector
- Summary of the separate meeting: PMT in middle of 4 PbWO4 crystals, Hamlet found ice-box (Don to check if it fits in beamline), will mount 1 mm plastic fibers from back to reflect of mylar on the front (JC to talk to Vardan about this.)
- JC has Megan's paper on LED pulser linearity system and is beginning to work on it.
DAQ
- Increase speed by going to DMA.
- There is a benefit to coincidence mode to find unexpected 'stuff' in both detectors but it's not a high priority.
Electron detector
- Busy organizing analysis into more systematic effort, DD says they plan to implement the suggestions here https://qweak.jlab.org/elog/DAQ+%26+Analysis/215 More in the next meeting.
