Agenda

Operations
- Run 68: n,gamma coincidence with S101 (aka HV#4, Si HV prototype)
  - Cryogenic status:
    - stable. Have been more careful during LHe transfers to avoid strong thermal shocks.
    - Base temperature is slowly falling, down to 32 mK now
  - Have taken over 50 hours of PuBe coincidence data, triggering on the SiHV. 2-hour data sequences with 40-minute pause between for flashing
  - Neutralization hold time study suggests we can go 4 hours after a flash (test done at 50V, may be a little less hold time at our 40V standard)
  - First look at some neutron data
  - Analysis plan for neutron data
    - Dividing tasks and sharing code
    - Condor issues
  - Changes going forward
    - NaI-triggered data?
    - Trigger study
    - Adjust NaI signal range(ADC saturation above ~3 MeV)
    - Fine tune optimal Vbias?
    - Try prebias with no flashing
    - Fix vuk-01 clock (Vbias, Vleak, Ttower log times are sketchy)
- Future 150mm runs
  - 150mm w/phonons - need to design 600mK rod to accommodate 150mm cans
  - Received 4/3-inch DIBs from TAMU - now we can house either detector for phonon readout (would need to machine faces on 4/3-inch housing for DIBs)
  - Both S1501 and S1502 removed from housings and packaged to return to TAMU
- CDMS R&D Working Group: should we report on 150mm plans?
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)