KAGRA Logbook

DGS (GPS)

shoichi.oshino - 10:37 Tuesday 26 March 2024 (28969)

Common view server troubleshooting

The common view server has not been able to retrieve NICT data since 1 March. This is due to a change in the NICT data repository. We have applied a patch from the developer and confirmed that the data can be retrieved. However, there is a problem with the LCD display on the front of the server. It is unclear whether this is due to the update process. The server was shut down and sent to the development company on 25 March for repair.

Comments to this report:

shoichi.oshino - 16:14 Wednesday 17 April 2024 (29256)

Today Common View came back from repair and I plugged in the cables and tried to start it up.
During this process, the connector on the GPS antenna cable came loose.
I asked Shimode-san to try to solder the coaxial cable to the connector but it did not work.
The connector fittings are thinner than the coaxial cable core and cannot be attached as it is. So the shaft was shaved to make it thinner. However, the shaft had a copper coating on the aluminum and could not be soldered. We decided to buy a Better connector that matched the shaft.

Images attached to this comment

shoichi.oshino - 15:32 Friday 19 April 2024 (29278)

Shimode-san repaired the cable with a new connector.
After checking that there were no strength problems, all cables were connected to the CV and started.
Network configuration and NFS mount settings are fine.
After a short while, it was confirmed that the GPS signal was received.

shoichi.oshino - 13:14 Tuesday 23 April 2024 (29294)

I found that GPS differential files are not copied to NFS server.
This is due to the creation time of the differential file being changed to 11:20, which is later than the existing script execution time.
Therefore, I changed copy and plot script execution time to after that time.