daniel.sigg@LIGO.ORG - posted 10:49, Tuesday 27 August 2019 - last comment - 11:30, Wednesday 28 August 2019(51537)
Replacing external RF power amp, coupler and cables of SQZ AOM1
To address teh CLF power jumps, see alog 51451, we replaced the RF amp, E1700005/serial S1700249, the coupler, E1700035/serial S1700255, and cables, ISC_SQ_32 and ISC_SQ_368_1, with spare units S1700248 and S1700254, and new cables.
There was a piece of yellow electrical tape stuck to the TNC thread of the panel feedthrough. It was removed. The RF opwer monitor changed from 33.7dBm to 34.2dBm, whereas the CLF power currently is 1.43mW.
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This didn't fix the CLF power jumps. The CLF power jumps are about the same, so it looks like the effect seen in the RF power monitor has gone down somewhat.
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