Agenda

Operations
- Run 68: n,gamma coincidence with S101 (aka HV#4, Si HV prototype)
  - Cryogenic status:
    - We saw no leaks to the IVC at room temperature, nor did we see a leak from bath to IVC at 77K
    - Cooled to base on Monday. Not our best: 36/34 mK with DCRCs on/off. But seems to be stable so far.
    - As of Wednesday the circulation pressures increased - may be an early sign of cryo trouble, again
  - Took bias-scan data: noise threshold looks like before, optimal bias is 40V
  - Took some data with reduced thresholds
  - Set up NaI detectors to digitize pulses, took NaI background data with no PuBe present
  - Took test coincidence data, triggering on both the SiHV and the NaIs.
  - Overnight took PuBe coincidence data, triggering on the SiHV
  - From earlier data, still need to look at neutralization hold time and the time-shifting glitch
- Future 150mm runs
  - 150mm w/phonons - 600 mK heatsinking?
- CDMS R&D Working Group: emails from Matt Pyle
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 67 (re-run of USD1)
  - probably time to reach out to Kyle Sundqvist, Aaron Phipps
- Run 65 (Si 150mm 5Q 1/2-vacuum-interface)
  - 150 mm paper published here
- LIPs search using Run 66 GeHV data.
- Need to start Phonon Collection Efficiency paper (HV2, HV4, iZIP pathfinder). Noah says he's willing to participate, should revisit in September
- Run 62 (HV#4, Si)
  - planning to work on low-energy calibration
- Run 63 (Ge iZIP pathfinder)
  - need to analyze Cf data
Old/continuing items:
- exploring ideas for improvements without upgrade: 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)
- 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
  - Update on He recovery efficiency, slow transfer test
  - 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)