40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Entry  Wed Aug 8 19:54:06 2012, Manasa, Configuration, IOO, MC trans optics configured Pic1.png
    Reply  Wed Aug 8 22:12:30 2012, rana, Configuration, IOO, MC trans optics configured 
       Reply  Wed Aug 8 22:17:43 2012, Manasa, Configuration, IOO, MC trans optics configured 
          Reply  Fri Aug 10 09:54:51 2012, Manasa, Configuration, IOO, MC trans optics configured 
             Reply  Fri Aug 10 11:05:33 2012, jamie, Configuration, IOO, MC trans optics configured 
                Reply  Fri Aug 10 15:05:52 2012, Manasa, Configuration, IOO, MC trans optics configured 
                   Reply  Thu Aug 16 17:28:51 2012, Manasa, Configuration, IOO, MC trans optics configured 
                      Reply  Tue Oct 2 14:20:33 2012, Manasa, Configuration, IOO, PDA255 not working 
Message ID: 7122     Entry time: Wed Aug 8 19:54:06 2012     Reply to this: 7126
Author: Manasa 
Type: Configuration 
Category: IOO 
Subject: MC trans optics configured 

Jan and I wanted to measure the ringdown at the IMC. Since the QPD at the MC trans is not fast enough for ringdown measurements, we decided to install a pickoff to include a faster PD while not disturbing much of the current MC trans configuration. The initial configuration had very little space to accommodate the pickoff. So the collimating lens along with the QPD were moved 2 inches closer to the incoming beam. A 50-50 BS was put in front of the QPD and the steering mirror was moved behind to reflect MC trans output to the new PD. The current configuration is shown below with the MC autolocker threshold mentioned in Jenne's elog

Pic1.png

The hunt for a faster PD wasn't satisfactory and we found a couple of PDs that were good for measurements actually didn't work after installing them. The one currently installed is also not satisfactorily fast enough for ringdown measurements. We'll hunt for faster PDs at Bridge tomorrow and replace PDA400. Also the IMC unlocked from time to time....may be we were noisy and didn't master the 'interferometer walk' very well.

 

 

ELOG V3.1.3-