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takahiro.yamamoto - 22:55 Monday 15 May 2023 (25235) Print this report
Candidate of new frequencies for calibration lines

Abstract

I investigated the new candidate frequency for calibration lines.
I plan to move ETMX_TM line from 31.51Hz to 27.1Hz,
Pcal_1 line from 32.7Hz to 28.21Hz, and Pcal_2 line from 32.7Hz.
 

Details

For the better parameter estimation, I searched the non-peak frequency band in more lower frequency region.
But because of the relation between the pcal power and the sensitivity, it's difficult to use below 20Hz.
So I focused on moving from above 30Hz to below 30Hz and I found the non-peak band around 26-30Hz as shown in Fig.1.
Overall plot and exact frequency values can be found on DAC Wiki

Finally, I decided to move ETMX_TM and Pcal_1 lines to below 30Hz and Pcal_2 line to the frequency for Pcal_1 in previously.
I will compute the reference value of various transfer functions at the new line frequencies for tracking calibration lines on the real-time front-end.
After finishing the calculation, I will move to the calibration lines.

Images attached to this report
Comments to this report:
takahiro.yamamoto - 1:30 Wednesday 17 May 2023 (25263) Print this report
I changed line frequencies as follows.
- ETMX_TM: 27.1Hz
- Pcal_1: 28.21Hz
- Pcal_2: 32.7Hz

Used pcal was also change from Y to X.
But I found spectral peak around 27Hz on the RxPD of X-Pcal as shown in DAC Wiki.
This spectral peak is ~1/1000 amplitude of injected line height. So hopefully it can be ignored.

For checking the effect of this spectral peak, I keep these line frequencies during tonight.
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