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ID Date Author Typeup 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
  
  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 :
  
  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.
  
  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 
  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
  
  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
  
  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
  
  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.
  
  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 
  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 
  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 
  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
  
  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,
  
  4438   Thu Mar 24 13:56:05 2011 josephbUpdateelogelog restarted at 1:55pmRestarted elog.   
  4441   Thu Mar 24 19:48:13 2011 Aidan, KiwamuUpdateGreen LockingDesigns for permanent electronics for ALSKiwamu and I looked at all the electronics
that are currently in place for the green
locking on the X-arm and have made a set
 GreenLockingElectronics.pdfGreenEndPDHsupportboxandLO.pdfVertexBeatnoteAmplifierandComparator.pdfMixerFrequencyDiscriminator.pdf 
  4443   Fri Mar 25 08:58:38 2011 AidanUpdateTreasureCleared stuff off SP tableI tidied up some of the stuff that was
on the SP table. The ISS box that has been
sitting on there for months is now underneath
 ISS_box.JPG 
  4445   Mon Mar 28 15:18:04 2011 josephbUpdateCDSCDS updates on FridayLast Friday, we discovered a bug in the
RCG where the delay part was not actually
delaying.  We reported this to Alex
  
  4446   Mon Mar 28 15:49:18 2011 josephbUpdateCDSLessons from LST[Koji,Joe]
PART 1:
Koji was unable to build his c1lst
  
  4448   Mon Mar 28 16:24:35 2011 kiwamuUpdateGreen Lockingpower budget on PSL table   I measured some laser powers
associated with the beat-note detection system
 RFPD.png 
  4449   Mon Mar 28 17:06:15 2011 kiwamuUpdateGreen Lockinga mixer schoolIn
the last week Matt and I modified the MFD
 mixers.png 
  4450   Mon Mar 28 18:13:32 2011 ranaUpdateGreen Lockinga mixer schoolUsing 2 dBm for a Level 7 mixer is so bogus,
that I will dismantle this as soon as I come
over.
  
  4451   Mon Mar 28 18:22:43 2011 kiwamuUpdateGreen Lockinga mixer schoolPLEASE DO
NOT DISMANTLE THE SETUP ! 
  
  4452   Mon Mar 28 21:12:14 2011 JenneUpdatePSLNew PMC Base Riser DesignI (think) I have finished the new PMC base
riser.  The eDrawing of it (so you can
view it on any computer) has been uploaded
 PMC_riser.eprt 
  4453   Mon Mar 28 22:56:14 2011 ranaUpdatePSLNew PMC Base Riser DesignIts going to need some kind of way to locate
the PMC on the top. In the previous design,
we had the 3 balls to decouple the body from
  
  4454   Mon Mar 28 23:51:54 2011 JenneUpdatePSLNew PMC Base Riser Design


   
        
            
  
  4455   Tue Mar 29 00:00:55 2011 KojiUpdateIOOFixing MC/Freq Divider BoxThis is the log of the work on Wednesday
23rd.
1. Power Supply of the freq divider
  
  4456   Tue Mar 29 15:01:58 2011 Larisa ThorneUpdateElectronicsLow pass filter for X arm laser temperature control This is the continuation of http://nodus.ligo.caltech.edu:8080/40m/4402
 
 DSC_2889.JPGLPFgraph.pdf 
  4457   Tue Mar 29 15:50:21 2011 KojiUpdateElectronicsLow pass filter for X arm laser temperature controlFor bode plot:

USE LOG-LOG plot for the amplitude
  
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