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Homestake meeting minutes, 02/05/15

Attending: Gary, Terry, Daniel, Jan, Noah, Vuk, Tanner

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

Our agenda:

1) Homestake status

Vuk: All instrumentation from PASSCAL has arrived, total 25 seismometers and digitizers. During the last visit we solved the problem of GPS signal transmission to the underground stations. The solution required converting between the TTL format (used by transceivers) and the RS232 format (used by Q330) for the 1PPS signal. Installed instrumentation at the 300, 800, and three 4100 stations, and implemented the solution at the existing 3 4850 stations. Also solved the radio problem for the surface stations, the Ross and Yates surface stations are now operating. Also installed instruments at the Water Treatment Plant station, but the radio signal was not working probably because of the line-of-site issue. In total, we have 10 working stations (8 underground and 2 surface) plus one more surface station that is not communicating with the main computer. The main computer has reboot problems, trying to get help from Jaret, but at the moment the data is not flowing.

2) Planning next visit: probably Mar 23 - Apr 3

Vuk: Asked SURF whether these two weeks would work, waiting for reply. The idea would be to have the following coverage:

Week 1: Tanner, Pat, Victor Week 2: Tanner, Daniel, Vuk (probably only 3-4 days)

What we want to accomplish:

• Build and install the 4850 station near 17 ledge, including huts and the battery pad (if necessary).
• Install the two 2000ft stations. Power and network should be available by the time we arrive (network is currently down).
• Install the 1700 station nearest to Yates. Will not have network.
• Potentially install another station at 2000, further northwest. Discussions with SURF are in progress on this.
• Fix the radio issue with the water treatment plant station.
• Potentially install other surface stations, depending on weather.
• Improve the stability of the data flow.

Proposed battery operation/charging: batterydeploymentproposal.pdf

3) Analysis of existing data

1. Estimation algorithms (Shivaraj, Eric, Noah)

Noah's note on Rayleigh wave recovery: https://support.physics.umn.edu/svn/ligo/radiometer/doc/Rwavetests/Modified%20Tests2/