Reports until 15:33, Tuesday 30 July 2019
H1 ISC
matthew.withers@LIGO.ORG - posted 15:33, Tuesday 30 July 2019 (50932)
Tuesday Maintenance - RF Noise Injections and Continued Noise Profiling

Dick Gustafson, Marc Pirello, and Matthew Withers

We performed a series of RF signal injections by passing RF signals to the shielding of several cables via a ferrite transformer. The following table summarizes our work.

Time (UTC) Cable Name Cable Frequency [MHz] Injection Frequency [MHz] Injection Amplitude [dBV] Measured Frequency in DARM [Hz] Measured Amplitude in DARM [m/Hz^(1/2)]
15:56 - 15:59 ISC-C4-41-5 9.10023 9.10028 -30 50 1.8537*10^-19
15:59:45 - 16:03:45 ISC-C4-37-1 9.10023 9.10028 -30 50 4.12905*10^-19
16:05 - 16:09 ISC-C4-41-6 45.50115 45.5014 -30 No discernable effect No discernable effect
16:10:15 - 16:14:15 ISC-C4-37-2 45.50115 45.5014 -30 No discernable effect No discernable effect
16:17 - 16:21 ISC-C3-41-4 35.5 35.50005 -30 No discernable effect No discernable effect
16:22:45 - 16:26:15 ISC-C4-33-4 72 72.00005 -30 No discernable effect No discernable effect

From roughly 16:30 to 19:00 UTC, we collected the noise profiles of the following cables:

ISC-C4-41-5

ISC-C4-37-1

ISC-C4-41-6

ISC-C4-37-2

ISC-C3-41-4

ISC-C4-33-4