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Entry  Thu Sep 20 17:05:26 2012, Jenne, Update, General, REFL, IPANG are coming out of the vac 
    Reply  Thu Sep 20 20:07:38 2012, Jenne, Update, General, REFL, IPANG are coming out of the vac 
Message ID: 7423     Entry time: Thu Sep 20 20:07:38 2012     In reply to: 7421
Author: Jenne 
Type: Update 
Category: General 
Subject: REFL, IPANG are coming out of the vac 

Quote:

[Jenne, Unni, Manasa]

I touched some in-vac steering mirrors, so we have REFL and IPANG coming out of the vacuum, not clipping.  IPPOS was done yesterday.  I re-checked a few optics in the AS path that were hard to see yesterday while the plastic light access connector was in place, and AS still looks good.

Except for POX, POY, POP, and putting the regular EQ stops back on PRM, I think we're done with the in-vac stuff.

 [Rana, Jenne, Manasa]

POX is coming out of the vacuum.  We'll do POY tomorrow.  We were able to hold the Watec outside the chamber and focus it on the pickoff mirror, and make sure it was roughly centered.  Then we took the lens off the camera, put the camera in the POX beam path, and I steered the pickoff mirror until we were hitting the camera.  POY will be done the same way.

POP is more challenging, since the transmission of the G&H mirrors is so low.  We're not able to see a beam on an IR card held in the POP beam path.  I had thought of removing PR2, getting the beam out, then putting PR2 back (using the same dog clamping some alignment markers technique that we use for the test masses), but the G&H mirrors have a 2 degree wedge, so this won't work.  It would be fine for pitch, since the arrow is on the side of the optic, but it wouldn't be correct for yaw.

Maybe we should do something similar to what Suresh et. al. did when they set POP up originally - I think they put a green laser pointer on the POX table, and aligned it such that they were hitting the correct spot on PR2 and PRM (correct = the same as the IR spot, which should be the center of the optics).  If we can do that with the POP in-vac steering mirrors, then we're fine, and POP should come out when we're back to high power.

All video capture snapshots of tonights pictures are on the pianosa desktop.

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