camilla.compton@LIGO.ORG - posted 16:31, Thursday 29 February 2024 - last comment - 00:34, Monday 20 May 2024(76056)
Measured Distance between ALS table and Viewport
At LLO, Aidan and Karla found the ISCTEX/Y tables (ALS/HWS) tables were further from the BSC viewport than designed which would change Aidan's T1000717 mode-matching calculations. Ours are also different, EY more than EX.
Distances are from the ISC table horizontally to the viewport outside edge, as in D0902168 and D0902163.
Measured to the back edge of VP closest to chamber and removed 2" for VP flange thickness, in photos the tape measure distance is 3".
| Design | Measured (+/-0.5") | Difference | |
| ISCTEX to BSC10 right VP | 16.5" D0902168 | 19.5" photo | 3" = 75mm |
| ISCTEY to BSC9 left VP | 16.5" D0902163 | 24.5" photo | 8" = 200mm |
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Comments related to this report
Madison Simmonds, Camilla Compton
G1100873-v4 shows this center of VP to table distance is 18.6" which is closer to what was measured but not what was used in the HWS calculations.