arnaud.pele@LIGO.ORG - posted 00:46, Tuesday 05 August 2014 - last comment - 17:40, Tuesday 05 August 2014(13203)
SRM-MC2-SR2 balanced - overnight measurements starting
[Jeff Arnaud]
Tonight we balanced the coils of the lower stages of MC2 SRM and SR2. The MC2 notes attached are explaining the procedure in detail. Below is summarized the ASD ratio after/before the exercise for each suspension and each level.
For some reason M3 stage of SR2 was harder to balance than the other ones, so we gave up on it for now and will come back to it later.
| SUS | STAGE | ASD RATIO before/after balancing | |
| PITCH | YAW | ||
| MC2 | M2 | 19.71 | 2.63 |
| M3 | 21.27 | 13.52 | |
| SRM | M2 | 9.95 | 38.53 |
| M3 | 6.96 | 3.8 | |
| SR2 | M2 | ||
| M3 | 107.7 | 5.12 | |
And the gains which were found optimum for each coils
| SUS | STAGE | OSEM | GAIN |
| MC2 | M2 | UL | 0.988 |
| LL | -0.992 | ||
| UR | -1.007 | ||
| LR | 1.012 | ||
| M3 | UL | 1.082 | |
| LL | -0.948 | ||
| UR | -1.051 | ||
| LR | 0.922 | ||
| SRM | M2 | UL | 0.935 |
| LL | -1.024 | ||
| UR | -0.971 | ||
| LR | 1.063 | ||
| M3 | UL | 0.972 | |
| LL | -1.014 | ||
| UR | -0.972 | ||
| LR | 0.964 | ||
| SR2 | M2 | UL | |
| LL | |||
| UR | |||
| LR | |||
| M3 | UL | 1.003 | |
| LL | -1.050 | ||
| UR | -0.951 | ||
| LR | 0.996 |
Measurements will be running overnight to measure the cross couplings transfer functions for SR2 SRM and MC2
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Comments related to this report
There is a discrepancy in the text. While it says that SR2 M3 was not balanced however in the results table it is SR2 M2 the one blank. I can confirm that SR2 M2 is the one not yet balanced.