NAOJ GW Elog Logbook 3.2
Displaying report 1-1 of 1.
NaokiAritomi - 19:22, Monday 23 December 2019 (1955)
CCFC error signal on 20191223
First I increased green power from 40mW to 50mW. Carrier and CC resonance frequency is as follows. CC PLL frequency is same as last week.
| AOM frequency (MHz) | |
| carrier | 109.035827 |
| CC | 109.035977 |
CCFC error signal when AOM is scanned around CC resonance is shown in Pic. 1 channel 2. It is different from the error signal last week and seems very noisy. I also measured spectrum of CCFC error signal when CC is locked on resonance (Pic. 2). There is a very strong 113Hz peak in CCFC error signal.
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113 Hz is the frequency of the line sent to the rampeauto perturb channel to test LO alignemnt with the technique proposed by Raffaele. I guess we forgot to switch it off last friday.
I connected remotely and switched it off now. Sorry for the inconvenience!