jaclyn.sanders@LIGO.ORG - posted 14:33, Thursday 30 May 2013 - last comment - 16:40, Thursday 30 May 2013(6564)
Green beam in the cavity again!
(Jax, Sheila)
The green beam is officially on ITMY again!
Unfortunately we no longer have the baffle photodiodes at our disposal, so we can't reproduce the OAT calibration. The rough alignment was achieved by viewing the beam on the pitch and yaw axes of the ITMY and averaging the counts on either side of the optic.
measurements - (pitch, yaw) in counts:
| (-19300, 9170) | ||
| (-14400, 11870) | optic | (-14400, 6470) |
| (-4900, 9170) |
The nominal TMS alignment is (-14400, 9170).
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Comments related to this report
The HEPI is controlled in position with a 100mHz UGF. The location of the HEPI structure is:
| May 30, 2013 - 12h00 PT | IPS | Raw count |
| H1 | -5730 | |
| H2 | -5670 | |
| H3 | -7646 | |
| H4 | -8630 | |
| V1 | -6783 | |
| V2 | -387 | |
| V3 | 2123 | |
| V4 | -2334 |
No YAW offset was added.
I worked more on getting the beam back to the ETM. I got the beam visible on the cage but need to turn the illuminators on to align onto the ETM. The beam is visible on the ETM cage at (P,Y) = (220, -230).