Reports 1-1 of 1 Clear search Modify search
MIF (ASC)
hirose.chiaki - 10:40 Friday 02 December 2022 (23087) Print this report
Comment to Measurement of stability to sensing matrix of Yarm (23026)

I summarized the results of the sensing matrix.
We did measurement of Sensing matrix in 22, 23, 24, and 28 Nov.
Shift ±4 mm of PIT, YAW direction on ITMY beam spot (add to the set point: PIT's IY, EY by 2 urad: YAW's IY, EY by ±2 urad) from the determined center.
Good oplev of center : following the figure in klog23026.
Good oplev of center on 28th is changing from this work(klog23069), It is possible that the center from the previous day and the center on the 28th may be misaligned.
Replacement of signal generators(klog23008) has reduced the value of the WFS signal.

22th : center, PIT+4mm : IMMT2, PR2
23th : center : IMMT2,PR2,EY
24th : center, YAW±4mm : IY, EY, PR2, IMMT2 (also PR2 and IMMT2 on AS_WFS)
28th : Yaw ±4mm : PR2, IMMT2
We measured the degrees of freedom of each of these three times.
We originally wanted to measure three times on different dates,
but the number of measurements is not enough due to the high volume of measurements and the time it takes for the ADS to stabilize.
Also, PIT-4mm has not yet been measured.

  • The three data fluctuations are large relative to the error calculated from the coherence.
  • The ratio of the two QPD results has not changed significantly in the day-to-day measurements.
    In case the sensing matrices are fluctuating, I will set a larger phase margin for the ASC filter.

Sensing matrix : /user/Commissioning/data/ASC/2022/REFL_WFS/202211{22,23,24,28}/{center,p4mm_PIT, m_4mm_PIT, p4mm_YAW, m4mm_PIT}/TF_ASC_Yarm_REFLWFS_OVLEV_{mirrors}_{P,Y}{,_2,_3}.xml ->I haven't been able to organize some of the files.

Non-image files attached to this comment
Search Help
×

Warning

×