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Reports until 14:36, Wednesday 20 November 2013
H1 ISC
alexan.staley@LIGO.ORG - posted 14:36, Wednesday 20 November 2013 - last comment - 15:02, Wednesday 20 November 2013(8648)
HAM 6 Beam Diverters

(Alexa, Rich)

We tested the two beam diverters in HAM 6. We found that BDIV-C in beckhoff is connected to BDIV2 in the OMC REFL AIR path, and BDIV-D is connected to BDIV1 in the AS AIR path (this follows schematics). The readback and controls are all okay; however BDIV1 failed everytime we tried to open it. BDIV2 also had difficulty opening, but did not always fail. It seems that the beam diverters get stuck as they move. 

Also, if the beam diverters remain as currently placed on the table, we will need to switch the open/close functionality in software. I will wait until final alignment before implementing this. 

Comments related to this report
rich.abbott@LIGO.ORG - 15:02, Wednesday 20 November 2013 (8650)
There's so much friction in the bearing surfaces.  You can hear the metal squeaking each time the diverter swings its big head from side to side.
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