We investigated the SHV cable connectivity between the Ion Pump Controller at EY and the Ion Pump at Y2-8 checking for faults. We did not detect any obvious faults, we did detect the prior splice which was installed back in 2016. We used the Fieldfox in TDR mode with a 1.2 meter launch cable in low pass mode. I have attached scans of these findings:
First photo is a shot from the Controller, there is a large impedance change at 19 meters from the connection point, this is the same location of the splice made in 2016, the repair looks like we would expect a splice to look.
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=28847
Second photo is a shot from the Ion Pump back to the end station. There is a very small bump at 20 meters from the ion pump that is real, but is very very tiny, could be a kinked cable, but not enough to cause issues.
Otherwise, the cable looks fine. Future testing is warranted.
M. Pirello, G. Moreno, J. Vanosky
After the cable was deemed good, we took a look at the controller, and found some "events" recorded on the log, see attached photo, one such events pertains to the glitch noticed here. All events recorded were kept on the controller. We are going to look further into this.
