Agenda

Operations
- Starting Run 68: n,gamma coincidence with S101 (aka HV#4, Si HV prototype)
  - using reduced (6.7 mΩ) shunt resistances, bare Am source mounted at center of Side 1
  - after thinking about it a bit decided to leave 4K heatsinking as usual
  - some trouble with pins on one SQUET, but it looks like it's ok
  - At 77K discovered a leak from bath to IVC. This happened twice last run - why does it keep happening?
    - warming up now, will redo bottom indium seal, tighten other seals
  - Modified cryocleaning somewhat, opening valve wider for faster flow. Seems maybe this cleans it more thoroughly.
  - PuBe source should be available after last lab on April 30. We won't need it that soon.
  - continue to work on determining optimal source position from sims
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)
  - Joseph has set up an external site for HTML documentation for Run 67
- Run 65 (Si 150mm 5Q 1/2-vacuum-interface)
  - 150 mm paper final edits
    - 80% hold time vs bias model at low negative bias
    - Interpretation of flashing tests
- LIPs search - planning to use Run 66 data, best GeHV data.
  - Planning work with Gina and Max for MXP project
- 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)