Agenda
- Operations
- Run 66: re-run of HV#2
- Tower = 21.6 mK!
- HV-scan randoms data suggests optimal HV is 70V, based on widths of 0 keV peaks
- Optimal QET biases set using IbIs data
- Fridge shield complete
- PuBe source moved to PAN, alternating between lab and storage in 443
- Thick lead shield in lab to reduce gamma rate at HV#2 and the NaI detectors
- Background rate without source 32 Hz, with PuBe 73 Hz
- Beginning to take data with alternating periods of N-exposure, look for growth of 10keV line, estimate N flux Some initial plots
- Working on getting all channels stable, avoiding electrothermal oscillations
- Lab infrastructure
- He-3 circulation pumps
- still need to send back-up He-3 pump to Oerlikon/Leybold for service/repair
- Processing and Analysis
- Run 65
- a few more studies to do
- LIPs search - idea to look in our HV data, Runs 61 (Ge) and 62 (Si). How sensitive are we?
- quick back-of-the-envelope suggests we can improve on CDMS2
- Run 63 (Ge iZIP pathfinder)
- need to analyze Cf data
- Run 62 (HV#4, Si)
- n,gamma coincidence OF timing
- Old/continuing items:
- exploring ideas for improvements without upgrade: float DCRCs for symmetric biasing Proposed Scheme, decrease Rshunt in SQUETs (had a look at this, a little hard to set up: SQUET picture), sidewall sources?
- Run 62 (HV#4, Si) post-mortem: two “bad” channels seem not to be wiring problems, maybe the problem is on the detector (photos)
- Run 60, 6“ detector paper - Plan to edit and publish without 5Q data
- Lab infrastructure
- plans to try to improve helium recovery
- add length of copper tubing to recovery line, to warm helium on the way to the meter. We have used it and it seems to do something. But no indication yet that it is improving recovery.
- maybe try to recover helium while waiting for the transfer stick to cool before hookup
- DAQ and data pipe
- DAQ upgrade - discussed with Bruno about IbIs tool development
- Data storage and backup:
- Need to copy all Run 60 and some Run 61 data to SLAC
- Autoprocessing and data organization development:
- currently autoprocessing suspended, no “official” processing for Runs 60, 61, 62
- clean up database - some info missing. Consider adding additional info
- Possible plan to modify DCRCs (resistor swap) so we can increase front-end gain, improve IbIs (suggestion from Bruno)
- IF (not likely) new DCRC RevC.2 arriving from Bruce in Denver then
- missing resistors on 3 QET channels, we've ordered some
