Agenda

Operations
- Run 68: n,gamma coincidence with S101 (aka HV#4, Si HV prototype)
  - Cryogenic issues: 1K Pot keeps running dry, have to open needle valve wider every few hours
    - we've had to stop circulation over weekend, last couple nights to avoid possible fridge failure
    - not sure how to fix this. May need a partial warmup and retry
  - Noise amplitude measurements, worse than Run 62. This time we seem to have bias-related noise.
    - best threshold seems to be around 70 eV at 50 V
    - should study noise in more detail
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)
  - starting to work on impact ionization model
- Run 65 (Si 150mm 5Q 1/2-vacuum-interface)
  - 150 mm paper Posted to arXiv. Addressing NIM A reviewer comments, nothing major.
- LIPs search using Run 66 GeHV data.
  - Comparing limits and attenuation with depth (correction)
- Need to start Phonon Collection Efficiency paper (HV2, HV4, iZIP pathfinder)
- Run 62 (HV#4, Si)
  - planning to work on low-energy calibration, in prep for Run 67
- 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)