aLIGO LHO Logbook

H1 AOS

jason.oberling@LIGO.ORG - posted 08:37, Tuesday 06 June 2023 - last comment - 12:18, Tuesday 06 June 2023(70177)

Expected PR3/SR3 Pitch/Yaw to End-Station ACB PDs 1 & 4

I’ve done a rough calculation of the expected pitch/yaw from PR3/SR3 to ETMx/ETMy ACB PDs 1 and 4. Results come out the same, only differing in direction depending on which PD we’re shooting for. One big assumption I made: aligned PR3/SR3 points to center of ACB (not sure if this is true in practice). This is to aid in our attempt at refining PR3/SR3 OpLev pitch/yaw calibrations after Sheila noticed discrepancies here.

PR3 to ETMx ACB
- PD1
  - Pitch: 40.1 µrad up
  - Yaw: 37.2 µrad CW
- PD4
  - Pitch: 34.2 µrad down
  - Yaw: 37.2 µrad CCW
SR3 to ETMy ACB
- PD1
  - Pitch: 40.1 µrad up
  - Yaw: 37.2 µrad CCW
- PD4
  - Pitch: 34.2 µrad down
  - Yaw: 37.2 µrad CW

Comments related to this report

jeffrey.kissel@LIGO.ORG - 12:18, Tuesday 06 June 2023 (70187)

Link

Here's some of the details of the calculation that results in the urad of PR3 / SR3 displacement needed to move from "centered within the baffle's hole" to each baffle PD position he quotes above.

Also, just to translate "up/down" and "CW/CCW" at the ACB into PR3 Euler Drive Basis at PR3 (using the right hand rule): 
    Up = - PIT
    Down = + PIT
    CW = Clockwise = -YAW
    CCW = Counter Clockwise = +YAW

Non-image files attached to this comment

PR3toETMxACB.pdf

SR3toETMyACB.pdf