Reports until 11:10, Tuesday 26 March 2019
H1 CAL
thomas.shaffer@LIGO.ORG - posted 11:10, Tuesday 26 March 2019 - last comment - 11:49, Wednesday 27 March 2019(47883)
Started HIGH_FREQ_LINES Grd with new starting freq

Pep Covas, T. Shaffer

Started the HIGH_FREQ_LINES Guardian node to sweep H1:CAL-PCALX_PACALOSC1_OSC_FREQ from starting frequency to 2000Hz by 500Hz steps. The steps will happen every 12 hours, but it will wait until we are not locked to change the frequency, so it could be longer than the 12.

Line amp = 35000

Starting freq = 5950.0Hz

Step size = 500Hz

Comments related to this report
pep.covas@LIGO.ORG - 15:45, Tuesday 26 March 2019 (47901)
Link

We unmonitored H1:CAL-PCALX_PCALOSC1_OSC_FREQ in SDF.

pep.covas@LIGO.ORG - 17:55, Tuesday 26 March 2019 (47912)CAL, DetChar
Link

J. Kissel, P. Covas

We found that the PCALX saturated, so we turned off the line at 5950.0 Hz, then turned off the optical follower servo and then reenabled it. Then we turned up the line around 0:18 UTC. We saw the non-linearity (down-conversion) seen previously in O2 is still there, which produces a line at 86 Hz, as can be seen in the attached plot. At 0:24:45 the frequency of the line was changed to 3 kHz.

Images attached to this comment
pep.covas@LIGO.ORG - 11:49, Wednesday 27 March 2019 (47929)
Link

We have seen that the line had been reverted back to ~6kHz. At 18:47 UTC we have changed it to 3001.3 Hz