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IDup Date Author Type Category Subject Text Attachments
  4385   Tue Mar 8 15:20:31 2011 kiwamuUpdateGreen Lockingdifferential noise on Mar.8th   differential_noise20110308.png 
  4386   Tue Mar 8 15:23:16 2011 steveUpdatePEMclean room glovesAnsell
AccuTech
91-300 clean
  
  4387   Tue Mar 8 15:33:09 2011 kiwamuSummaryGreen Lockingplan on Mar.8th
  
  4388   Tue Mar 8 16:59:47 2011 josephbUpdateCDSSimulated Plant WorkThe screens for the simplified c1spx model
have been updated.  I re-introduced
the suspension point information into the
  
  4389   Wed Mar 9 04:46:13 2011 kiwamuUpdateGreen Lockingmore intensity noise measurement 
Here is a diagram for our intensity
noise coupling measurement.
 intensity_setup.pngIntensityNoise.png 
  4390   Wed Mar 9 16:07:42 2011 kiwamuUpdateVIDEOcable session[Koji, Steve, Suresh, Kiwamu]
The following video cables have been
newly laid down :
  
  4391   Wed Mar 9 17:29:11 2011 steveSummaryVACsingle O-ring protectionWe have one single O-ring on the 40m vacuum
envelope. It is on the OOC west side, facing
the AP table. This O-ring has to be protected
 so1.jpgP1070458.JPG 
  4392   Wed Mar 9 18:17:11 2011 kiwamuUpdateGreen LockingIntensity noise couplingHere
is a new plot for the differential noise
measurement. I plot a noise contribution
 diff_noise.pngIN_TF.png 
  4393   Wed Mar 9 23:19:04 2011 kiwamuUpdateCDSrebooted c1iooFor
some reason the c1ioo machine suddenly died
just 30 miteus before.
  
  4394   Thu Mar 10 01:28:47 2011 joe, jamie, rana, chrisSummaryCDSSimSuspension !Today was a banner day for  40mETMY.pngdvsim.pngredpill_bluepill.jpg 
  4395   Thu Mar 10 01:31:37 2011 KevinUpdateElectronicsAS55 CharacterizationsI measured the transfer function, shot
noise, and dark spectrum of AS55.
From the shot noise measurement,
  
  4396   Thu Mar 10 13:44:56 2011 josephbUpdateCDSAdded digitization noise to the c1spy model for simulated ADCs/DACsTo simulate digitization noise, the easiest
way I found was to use the MathFunction block,
found in the CDS_PARTS model, under simLinkParts. 
  
  4397   Thu Mar 10 14:06:54 2011 kiwamuUpdateGreen LockingIntensity noise limits the beatnote sensitivityWe are limited
by the intensity noise of the X arm transmitted
 diff_noise_Mar8.pngIN_TF_complete.png 
  4398   Thu Mar 10 14:22:58 2011 kiwamuUpdateGreen LockingIntensity noise limits the beatnote sensitivityThe next steps we should do are :
    - to investigate
a cause of the intensity fluctuation
         
  
  4399   Thu Mar 10 14:29:05 2011 KojiUpdateGreen LockingIntensity noise limits the beatnote sensitivityWe can modify the freq divider circuit
to make it a comparator.

  
  4400   Thu Mar 10 14:30:53 2011 ranaUpdateGreen LockingIntensity noise limits the beatnote sensitivityThere are 3 standard techniques to
reduce this effect:
1) Stabilize the end laser by sensing
  
  4401   Thu Mar 10 16:00:53 2011 Aidan, JoeUpdateGreen LockingIntensity stabilization loop using beatnote DC.Aidan: Joe and I have added a channel that
takes the DC output from the vertex beatnote
PD and sends it, via RFM, to a DAC at the
 P1000313.jpgP1000314.jpgP1000315.jpgGREEN_ISS_LOOP.pdfScreenshot-C1ALS_OVERVIEW.adl.png 
  4402   Thu Mar 10 17:03:48 2011 Larisa ThorneConfigurationElectronicscalculations for passive low pass filter on X arm[Kiwamu, Larisa] 
 
We want to increase gain in the lower
  
  4403   Thu Mar 10 21:45:34 2011 ranaUpdateGreen LockingIntensity stabilization loop using beatnote DC.Ridiculous
and hacky. Digital stabilization removed
as well as the old "leave a pile of
  
  4404   Fri Mar 11 11:33:24 2011 josephbUpdateCDSFixed mistake in Matrix of Filter banks naming conventionWhile fixing up some medm screens and getting
spectra of the simulated plant, I realized
that the naming convention for the Matrices
  
  4405   Fri Mar 11 16:30:42 2011 steveUpdateGeneralhigh speed servo unit is hereNew
Focus Servo Controller has just arrived.
We have 25 days to evaluate this product.
 P1070462.JPG 
  4406   Fri Mar 11 18:32:45 2011 josephb, Chris, JamieUpdateCDSDebugging simplant dampingThe FM1 filter module change for XXSEN
was propagated to the ETMX suspension. 
This was a change from a 30,100:3 with a
  
  4407   Sun Mar 13 00:00:58 2011 jzweizig, ranaConfigurationDAQNDS2 code change and restart John has changed the NDS2 code and
restarted it on Mafalda. The issue is that
it goes off the rails everytime the DAQD
  
  4408   Sun Mar 13 04:00:53 2011 ranaUpdateCDSETMY Sim workI did some work on the ETMY   
  4409   Sun Mar 13 16:46:48 2011 josephbUpdateCDSETMY Sim work4. The blue Output Filters  section
has been changed to agree with the new filter
of matrices row, column labeling.  My
  
  4410   Fri Mar 18 11:29:36 2011 josephbUpdateCDSMinute trend issues[Joe, Alex]
Steve pointed out to me today he
couldn't get trends for his PEM slow channels
  
  4411   Fri Mar 18 12:22:04 2011 kiwamuUpdateGreen LockingY arm plan for today Prior
to the works on the Y end setup I propose
to perform the temperature scan business
  
  4412   Fri Mar 18 14:18:00 2011 kiwamuSummaryGeneralnew laser pointersJust for a record. We got 4 new laser
pointers (2 greens, 1 blue, and 1 green and
 DSC_2883_ss.jpg 
  4413   Fri Mar 18 16:06:30 2011 kiwamuUpdateGreen LockingRe: Y arm plan for todayWe use
Alberto's laser for the Y end Green Locking.
  
  4414   Fri Mar 18 16:31:11 2011 Suresh UpdateGreen LockingRe: Y arm plan for todayThe
reason for using Alberto's laser is that
some amount of work has already gone into
  
  4415   Fri Mar 18 17:25:21 2011 josephbUpdateCDSLockins in c1sus update, suspension screens updatedI updated our lockin simulink pieces to
use the newer, more streamlined lockin piece
that is currently in CDS_PARTS (with new
  
  4416   Fri Mar 18 17:55:58 2011 SureshConfigurationGreen LockingWork Plan for Y-end Aux laser installationA rough
time-table and the various tasks are given
below: 
  
  4417   Mon Mar 21 13:26:25 2011 KojiUpdatePSLPMC Trans/RFPDDC PMC TRANS/REFL on MEDM showed red values
for long time.
TRANS (a.k.a C1:PSL-PSL_TRANSPD) was
  
  4418   Mon Mar 21 16:31:02 2011 steveUpdateSAFETYBryan Barr received safety trainingBryan Barr is visiting us from Glasgow
for a month. He received 40m specific safety
training on Friday.
  
  4419   Mon Mar 21 16:49:11 2011 kiwamuSummaryGreen Lockingplan for this week- Plan for this
week
  
  4420   Mon Mar 21 18:34:10 2011 kiwamuUpdateGreen Lockingadded a new ADC channel on 1X9I added a new ADC channel for a DC signal
from the X end green PD.
 aa_board_1X9.jpg 
  4421   Tue Mar 22 00:01:25 2011 kiwamuSummaryGreen Lockingplan for daytime tasksSome
tasks for the daytime tomorrow.
  * Beam profile measurements
  
  4422   Tue Mar 22 00:03:29 2011 BryanConfigurationGreen LockingPSL vs Y arm laser temperature pairing OK. Today we did the same type of
measurement for the Y arm laser as was done
for the X arm laser here: 
 PSL_vs_Y_arm_Temperatures.png 
  4423   Tue Mar 22 00:23:20 2011 JenneConfigurationGreen LockingPSL vs Y arm laser temperature pairing


   
        
            
  
  4424   Tue Mar 22 16:39:51 2011 kiwamuUpdateGreen Lockingcomaprator installed : 80 pm residual displacement A
comparator has been installed before the
MFDs (mixer-based frequency discriminator)
 noise_curve20110322.png 
  4425   Tue Mar 22 19:03:45 2011 BryanConfigurationGreen LockingPSL vs Y arm laser temperature pairing

    

       
            
  
  4426   Wed Mar 23 00:51:47 2011 kiwamuUpdateGreen Lockingplan for tomorrow  -
Plan for tomorrow
    * Video cable
  
  4427   Wed Mar 23 05:11:08 2011 kiwamuUpdateGreen Lockingservo handig offSucceeded
in handing off the servo from the green to
 stripTransit_edit.pngnoise_curve20110322_hUGF.png 
  4428   Wed Mar 23 08:50:36 2011 AidanUpdateGreen Lockingservo handig offNicely done!
 

 green-to-red.jpg 
  4429   Wed Mar 23 09:48:20 2011 steveUpdatePSLPSL enclosure: gets new window & laserSolid door, numbered 4 at south west corner
of PSL enclosure was replaced by laser protective
window.
 P1070471.JPG 
  4430   Wed Mar 23 09:54:46 2011 steveOmnistructurePhotosLSC visitorsThe 40m lab was visited by  ~ 30 LSC
members  the end of last week.
 P1070467.JPGP1000414.jpg 
  4431   Wed Mar 23 10:34:17 2011 josephbUpdateCDSTrend issue fixed[Joe, Alex]
Yesterday during the day, Alex ran
a script to fix the time stamps in the trends
  
  4432   Wed Mar 23 12:40:22 2011 Chief Recycling OfficerHowToEnvironmentRecycle stuff!The following is a message from the LIGO
40m Chief Recycling Officer:
  
  4433   Wed Mar 23 14:19:35 2011 KojiSummaryGeneralGrand PlanThis is the grand plan we talked about
in the beginning of the meeting.

    (Kiwamu) X-end Green cleaning
  
  4434   Wed Mar 23 16:06:20 2011 Larisa ThorneUpdateElectronicsUpdate on cable laying [Steve, Suresh, Larisa]
The following cables were laid today:
ETMYT, ETMY, IFOPO, MC1, OMCR, AS Spare,
  
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