cheryl.vorvick@LIGO.ORG - posted 13:19, Saturday 08 July 2017 (37363)
changes in H1 alignment: IMC, IMC WFS, IMs, ISS 2nd Loop QPD, PR2
H1 has a number of alignment changes pre-5.8M to post-5.8M Montana earthquake.
IMC optic alignment changes are listed here, in urad and beam position change in mm:
- these changes can reflect both a beam pointing change from the PSL and IMC optic alignment changes
- the IMC Trans camera no longer has the same image of the beam, which reflects the beam position change coming out of the IMC
- this beam change is then transmitted through the IMs to the rest of the H1 optics
| delta urad | delta mm | |
| mc1 p | 2.3 | 0.1 |
| mc1 y | 29.1 | 1.3 |
| mc2 p | 9.7 | |
| mc2 y | -13.2 | |
| mc3 p | 34.6 | 1.6 |
| mc3 y | 19.5 | 0.9 |
IM changes worth noting:
- I believe IMs were set back to the old nominal values, following my outdated instructions, however...
- IMs have been allowed to drift, so it's appropriate to return to pre-5.8M values
- I did communicate this, and thought the IMs were reset, but this check makes that unclear
- the pre-5.8M with unlocked H1, and IMC locked, time is July 4, 22:30:00UTC
- values used (and GPS times) are in the attached pdf file
| delta urad | |
| im1 y | 39.5 |
| im2 p | 11.4 |
| im2 y | 46.7 |
other optics/qpds worth noting:
| delta | |
| imc wfs a p (reflects IMC optic alignment / PSL beam) | -0.129 wfs qpd |
| imc wfs b p (reflects IMC optic alignment / PSL beam) | -0.203 wfs qpd |
| imc wfs b y (reflects IMC optic alignment / PSL beam) | 0.051 wfs qpd |
| iss 2nd loop y (reflects IMC beam and IM alignment) | -0.131 qpd |
| pr2 p (reflects IMC beam and IM alignment) | -20.0 urad |
| pr2 y (reflects IMC beam and IM alignment) | 22.6 urad |
Non-image files attached to this report
