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Homestake meeting minutes, 05/28/15

Attending: Vuk, Levi, Tanner, Victor, Daniel, Gwynne, Gary, Pat

Homestake wiki: https://zzz.physics.umn.edu/groups/homestake/home

Our agenda:

• Homestake status (Gary, Tanner, Daniel, Pat):
  • Yates station: there was water in the dog house which ruined the power box. Replaced the power box, working well now. Likely that the water came in through a vent, sealed it now. Did not do the same fix on other dog houses.
  • Installed 3 far stations. The main concern is with the Deadwood site is that they hit the water level, so made a bit of a trench around it.
  • 1700-1: after some troubleshooting, took the hardware to the surface, tested some more. Eventually found a bad pin in a connector - fixed it, and now working.
  • 2000-A: Q330 found in a strange state. Rebooted it and now working again. PASSCAL did not know about this failure more. Gary thinks it is the firmware, will have to watch how things behave over time. Data is saved on the baler, but did not harvest it.
  • 2000-E: observed that the grout around the granite tile was drying and flaking off. The tile is firmly attached to the concrete, but the concrete is old and crumbling. The site is also wet. Not sure if the tilt events are related to the grout or to the concrete. We'd have to make a significant change to this station (probably pour a new piece of concrete), so decided to leave it for later. Gary: the tilt events are rather low-frequency events, so we should be able to filter them away. Fixing this will require 2 underground trips.

• Next Homestake trip (August/September)
  • planning for active excitations

• data analysis
  • calibration
  • radiometer method
  • data analysis workshop
  • other analysis plans
  • when do we harvest data from balers? Surface balers will fill up in about 1 year, underground ones in 1.5 years. Some of the surface sites are not accessible in the winter. August/Sep is when we should do this on at least some of the surface stations.