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Entry  Thu Feb 21 15:21:07 2013, yuta, Update, VAC, all heavy doors on, started pumping down annulus 
    Reply  Thu Feb 21 16:53:37 2013, Manasa, Update, PSL, PSL shutter 
       Reply  Fri Feb 22 13:03:49 2013, Manasa, Update, , MC REFL PD murder dead.jpg
          Reply  Fri Feb 22 17:33:25 2013, Manasa, Update, Electronics, MC REFL PD back from the dead 
             Reply  Wed Apr 22 17:04:11 2015, rana, Update, Electronics, MC REFL PD back from the dead 
                Reply  Thu Apr 23 08:43:40 2015, Steve, Update, Electronics, EG&G InGaAs diodes in stock 
    Reply  Thu Feb 21 18:01:27 2013, Steve, Update, VAC, pumpdown at 230 Torr 
       Reply  Thu Feb 21 21:12:42 2013, Koji, Update, VAC, pumpdown at 230 Torr 
          Reply  Fri Feb 22 08:01:25 2013, Steve, Update, VAC, pumpdown continuous 16hrs_pd75.png
             Reply  Fri Feb 22 11:12:16 2013, Steve, Update, VAC, pumpdown completed mag60min.pngpd75at20h.png
                Reply  Mon Feb 25 08:22:03 2013, Steve, Update, VAC, pumpdown at day 4 4d.png66d@atm.png
                   Reply  Fri Mar 1 14:50:36 2013, Steve, Update, VAC, pumpdown day 8 bgTP3d7.pngRGAonIFO.png
                      Reply  Wed Mar 6 08:40:03 2013, Steve, Update, VAC, first scan of this pumpdown pd75m12d.pngpd75mRGA12d.png
                         Reply  Mon Jun 3 09:46:40 2013, Steve, Update, VAC, RGA scan at day 100 d100Mpd75.pngd100Mpd75p.pngbadguys.png
                            Reply  Mon Jul 15 14:12:15 2013, Steve, Update, VAC, RGA scan at day 144 pd75mRGA144d.pngpd75m144d.png
Message ID: 8130     Entry time: Thu Feb 21 16:53:37 2013     In reply to: 8129     Reply to this: 8137
Author: Manasa 
Type: Update 
Category: PSL 
Subject: PSL shutter 

[Steve, Jenne, Yuta, Manasa]

We have kept the laser ON at low power through the pump down process. As we pumped down, at around 400torr, we found that the PSL mech shutter closed. Steve explained  that it was due to an interlock with a pressure gauge. To keep the IFO running, we switched the shutter from N.C (normally close) to N.O (normally open). This should be undone after the pumpdown.

In the process of figuring out, we reset the shutter and switched it ON and OFF a couple of times.

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