Campuses:
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Homestake Meeting, 12/11/14
Attending: Vuk, Gary, Tanner, Gwynne, Victor, Pat, Daniel, Nelson
Homestake wiki: https://zzz.physics.umn.edu/groups/homestake/home
Our agenda:
1) Homestake status: Gary, Tanner, and Pat visited Homestake in Nov, installed 3 stations at 4850 (all but the 17-ledge one) and two stations on the surface (near Ross and near Yates). GPS antenna on the roof of Yates admin building, Q330 master and a GPS transceiver in IT room in the admin building, GPS receivers in all underground stations. All underground stations are AC powered, two via a small battery and one via a DC power supply. Radio antenna installed on the roof of Yates admin building.
- GPS system 2014_12_11_homestake_timing.pdf (Tanner): showing timing error for each of the three stations, how far each digitizer clock is from the GPS clock. Continuous GPS signal underground, but it appears there is a non-trivial drift over time, up to several ms. It appears the stations are receiving the GPS time, they are listed at >85% for each station, so it is not clear what this drift means and whether this is a problem. Probably need Tim to understand this, should hear from him soon. Also not clear why the clock quality is not at 100%. Manual indicates that the behavior at 48D and 48C could be due to a poor signal, will have to check with Tim and Jamey.
- radios (Gary): tested radios inside a building and they worked well, so they should be programmed correctly. However, at the moment the master radio is not communicating with the surface stations. Did spectral analysis and suspect the problem is that there are many wireless ports in the admin building that are in the same band as the radio antenna. Need to find out how to re-program the radios to operate in the upper part of the band (there are several free channels there). Currently the master radio is connected to one of the ethernet ports of the antelope server, but the port is probably configured wrong. Would be good if we could fix this remotely, Gary will look into this - need information (root password) from IRIS to do this.
Currently, the second network port of the antelope server is connected to the Homestake network, to which underground stations are also connected.
- antelope software: Gary remotely logged into the antelope server and configured it, so that we now have a real-time data stream. Need VPN to log into the antelope machine, can run antelope software such as dlmon to monitor the data etc. Have to figure out how to send/download data from this computer to other remote machines. Gary will try to set things up in his office, and will send the configuration files to others, so that we can keep several copies of the data in different locations.
- first data
2) Planning next visit: Jan 12 - ?
- meeting with PASSCAL?
- antelope at UMN?
3) Analysis of existing data