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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: 11237     Entry time: Wed Apr 22 17:04:11 2015     In reply to: 8138     Reply to this: 11238
Author: rana 
Type: Update 
Category: Electronics 
Subject: MC REFL PD back from the dead 

Just randomly found this old entry from 3 years ago. We should never have installed a GAP 2000 - they are an inferior type of InGaAs diode. We should add to our list replacing these with a 2 mm EG&G diode.

How many 2 mm EG&G InGaAs diodes do we have Steve? Can you please find a good clean diode case so that we can store them in the optics cabinet on the south arm?

Quote:

 [Yuta, Manasa]

We replaced the dead photodiode on MC REFL PD with a new one (GAP 2000). We measured the frequency response of the PD and tuned the resonant frequency using inductor L5 (in the circuit diagram) to be 29.575MHz - over an average of 10 measurements.

 

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