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40m Log |
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Mon Mar 19 23:44:00 2018, gautam, Update, IOO, IMC loop checkup 
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Tue Mar 20 16:53:03 2018, gautam, Update, IOO, IMC loop checkup
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Tue Mar 20 21:08:03 2018, gautam, Update, IOO, IMC loop checkup
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Tue Mar 20 22:44:45 2018, gautam, Update, IOO, IMC loop checkup
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Wed Mar 21 15:52:45 2018, gautam, Update, IOO, MC error point calibration  
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Wed Mar 21 17:31:21 2018, gautam, Update, IOO, MC error point calibration
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Wed Mar 21 21:13:44 2018, gautam, Update, IOO, IMC noise budget
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Tue Mar 27 01:39:44 2018, gautam, Update, IOO, PSL noise eater was off
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Tue Mar 27 19:32:03 2018, arijit, Update, IOO, PSL noise eater was off 
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Tue Mar 27 23:37:35 2018, gautam, Update, IOO, MC REFL PD removed
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Wed Mar 28 21:31:39 2018, gautam, Update, IOO, MC REFL PD removed
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Wed Mar 28 21:47:37 2018, arijit, Update, IOO, MCREFL_PD Optical response measurement 
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Thu Mar 29 17:57:36 2018, arijit, Update, IOO, MCREFL_PD Optical response measurement
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Fri Mar 30 06:14:31 2018, rana, Update, IOO, MCREFL_PD Optical response measurement
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Fri Mar 30 22:37:36 2018, Kevin, Update, IOO, MCREFL_PD Optical response measurement
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Thu Apr 5 04:36:56 2018, Kevin, Update, IOO, Coil driver noise  
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Thu Apr 5 12:13:18 2018, Koji, Update, IOO, Coil driver noise
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Fri Apr 6 21:39:09 2018, gautam, Update, IOO, MC2 suspension health checkup
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Mon Apr 9 18:46:03 2018, gautam, Update, IOO, Further debugging 
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Tue Apr 10 14:28:44 2018, gautam, Update, IOO, Further debugging
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Wed Apr 11 01:34:31 2018, gautam, Update, IOO, Activities today
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Thu Apr 12 18:12:49 2018, gautam, Update, ALS, NPRO channels hijacked  
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Fri Apr 13 11:02:41 2018, gautam, Update, ALS, EX fiber polarization drift
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Fri Apr 13 17:56:26 2018, gautam, Update, ALS, Fibers switched out
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Sat Apr 14 14:42:09 2018, gautam, Update, ALS, Fibers switched out
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Tue Apr 17 14:08:29 2018, gautam, Update, ALS, Fibers switched out
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Fri Apr 20 00:26:34 2018, gautam, Update, ALS, Fibers switched out
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Sat Apr 21 20:25:12 2018, gautam, Update, ALS, PSL fiber pickoff status
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Thu Apr 19 00:03:51 2018, gautam, Update, IOO, More IMC NBing 
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Thu Apr 19 17:15:35 2018, gautam, Update, IOO, More IMC NBing 
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Sun May 20 23:43:50 2018, gautam, Update, IOO, Coil driver noise re-measurement    
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Tue May 22 17:26:25 2018, gautam, Update, IOO, MC1 Coil Driver pulled out
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Tue May 22 23:28:01 2018, gautam, Update, IOO, MC1 Coil Driver pulled out
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Wed May 23 17:58:48 2018, gautam, Update, IOO, MC1 Coil Driver pulled out 
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Wed May 30 10:17:46 2018, gautam, Update, IOO, MC1 Coil Driver pulled out 
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Fri Apr 6 22:23:53 2018, Kevin, Update, IOO, Coil driver noise
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Message ID: 13719
Entry time: Thu Mar 29 17:57:36 2018
In reply to: 13716
Reply to this: 13721
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Author: |
arijit |
Type: |
Update |
Category: |
IOO |
Subject: |
MCREFL_PD Optical response measurement |
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Kevin, Gautam and Arijit
Today we performed the in-loop noise measurements of the MCREFL-PD using the SR785 to ascertain the effect of the Noise Eater on the laser. We took the measurements at the demodulated output channel from the MCREFL-PD. We performed a series of 6 measurements with the Noise Eater ''ON'' and ''OFF''. The first data set is an outlier probably, due to some transient effects. The remaining data sets were recorded in succession with a time interval of 5 minutes each between the Noise Eater in the ''ON'' and ''OFF'' state. We used the calibration factor of 13kHz/Vrms from elog 13696 to convert the V_rms to Hz-scale.
The conclusion is that the NOISE EATER does not have any noticeable effect on the noise measurements.
ALS beat spectrum and also the arm control signal look as they did before. coherence between arm control signals (in POX/POY lock) is high between 10-100Hz, so looks like there is still excess frequency noise in the MC transmitted light. Looking at POX as an OOL sensor with the arm under ALS control shows ~10x the noise at 100 Hz compared to the "nominal" level, consistent with what Koji and I observed ~3weeks ago.
We tried swapping out Marconis. Problem persists. So Marconi is not to blame. I wanted to rule this out as in Jan, Steve and I had installed a 10MHz reference to the rear of the Marconi. |
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