aLIGO LHO Logbook

H1 AOS (CAL)

darkhan.tuyenbayev@LIGO.ORG - posted 13:20, Tuesday 21 July 2015 - last comment - 11:43, Wednesday 22 July 2015(19792)

Adjusted calibration line drive levels

RickS, Sudarshan, Darkhan

We've adjusted PCALX, PCALY and ESD calibration line drive levels to give a signal to noise ratio of about 100 (for 8 s FFT) over the mean science mode spectra from ER7.

The following lines have been adjusted:

Line	Frequency (Hz)	Old drive level (ct)	New drive level (ct)
PCALX	33.1	38	700
PCALX	534.7	6000	19300
PCALY	36.7	40	320
PCALY	540.7	5000	9900
ESD	34.7	0.50	0.22
ESD	538.1	0.20	2.40

Comments related to this report

evan.hall@LIGO.ORG - 02:28, Wednesday 22 July 2015 (19823)CAL

Link

I added pcal lines at 325.1 Hz, 3000 ct for X and 331.9 Hz, 1500 ct for Y. These are maybe not optimal because they are in the region of the PSL piezo mirror mount, but I wanted to stay close to the DARM pole and out of the bottom of the bucket.

darkhan.tuyenbayev@LIGO.ORG - 11:10, Wednesday 22 July 2015 (19837)

Link

Based on noise levels around calibration lines during ER7, to get SNR of 100 (with 8 s FFT) , drive levels adjustments needed for LLO calibration lines:

PCALX_TX_at_33_7_Hz should be increased 6.19 times;

PCALX_TX_at_533_3_Hz should be increased 3.19 times;

PCALY_TX_at_37_3_Hz should be increased 6.41 times;

PCALY_TX_at_539_9_Hz should be increased 4.42 times;

LINE_SUM_at_34_9_Hz should be increased 1.68 times;

LINE_SUM_at_535_1_Hz should be increased 1.51 times.

kiwamu.izumi@LIGO.ORG - 11:43, Wednesday 22 July 2015 (19839)

Link

I inserted a nototch filter for each of the two lines that Evan added last night. Because of the limitation in the number of the IIR coefficients, I had to put one in suscomp (in FM7) and the other in ResG (in FM3). The previous notch that we put for the cavity pole tracker (alog 18401) was removed from FM7 since we have not been using it.