40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  PSL  Not logged in ELOG logo
Entry  Thu Aug 1 21:19:57 2013, tara, DailyProgress, BEAT, searching for beat 
    Reply  Fri Aug 2 12:18:16 2013, tara, DailyProgress, BEAT, searching for beat beat_2012_08_02.JPGnb_short_cav.png
       Reply  Fri Aug 16 22:05:27 2013, tara, DailyProgress, BEAT, noise hunting nb_short_cav.pngnb_short_cav.figbeat_psd.jpg
          Reply  Tue Aug 20 20:10:01 2013, tara, DailyProgress, BEAT, noise hunting beat_2013_08_20.png
       Reply  Thu Jun 26 17:10:09 2014, Evan, DailyProgress, BEAT, Beat 
Message ID: 1275     Entry time: Fri Aug 2 12:18:16 2013     In reply to: 1274     Reply to this: 1305   1438
Author: tara 
Type: DailyProgress 
Category: BEAT 
Subject: searching for beat 

Found the beat @ 116 MHz. RCAV SLOW =5.762V, ACAV SLOW = 1.209 V.

beat_2012_08_02.JPG

 

beat 1kHz input range, calibration  = 718 Hz/V

nb_short_cav.png

above, beat signal with 1kHz input range on Marconi.

Plenty of things that I need to optimize and add:

input optics (ACAV/RCAV):

  • beam alignment
  • optimizing quarter wave plates in front of the cavities.
  • block all the reflected beams properly
  • fixing the back reflection from vac window for ACAV.
  • measure error point noise from both servos and compare them with beat
  • optimizing TTFSS servo gain

Beat setup:

  •  mode matching lens
  • power on beat PD
  • optimizing PLL servo
  • implementing ISS

Seismic isolation

  • new table legs ( I have not ordered the new set yet). The current set is broken
  •  
ELOG V3.1.3-