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ID Date Author Type Categoryup Subject Text Attachments
  14583   Mon Apr 29 16:25:22 2019 gautamUpdatePSLPSL turned on againI turned the 2W NPRO back on again at ~4pm
local time, dialing the injection current
up from 0-2A in ~2 mins. I noticed today
  
  14593   Fri May 3 12:51:58 2019 gautamUpdatePSLPSL turned on againPer instructions from Coherent, I made
the some changes to the NPRO settings. The
value we were operating at is in the column
  
  14595   Mon May 6 10:51:43 2019 gautamUpdatePSLPSL turned off againAs we have seen in the last few weeks,
the laser turned itself off after a few hours
of running. So bypassing the lab interlock
 NPROshutoff.png 
  14597   Wed May 8 19:04:20 2019 ranaUpdatePSLPSL turned on again
Increased PSL HEPA Variac from
30 to 100% to get more airflow.
All
of the TEC setpoints seem cold to me, so
  
  14599   Thu May 9 19:50:04 2019 gautamUpdatePSLPSL turned off againThis time, it stayed on for ~24 hours.
I am not going to turn it on again today
as the crane inspection is tomorrow and we
 Screenshot_from_2019-05-09_19-49-29.png 
  14600   Thu May 9 22:26:39 2019 JonOmnistructurePSLSecond ADC added to PSL Acromag crateThis evening I added a second ADC module
to the prototype Acromag chassis. This chassis
can now read out all the PSL diagnostic channels.
 IMG_3291.jpg 
  14602   Fri May 10 15:18:04 2019 gautamUpdatePSLSome work on/around PSL table
In anticipation of installing the
new fan on the PSL, I disconencted the old
fan and finally removed
 IMG_7427.JPGIMG_7428.JPGIMG_7429.JPGnewPSLAcro.png 
  14604   Sat May 11 11:48:54 2019 JonUpdatePSLSome work on/around PSL tableI took a look at the error being encountered
by the modbusPSL service. The problem is
that the 
  
  14605   Mon May 13 10:45:38 2019 gautamUpdatePSLPSL turned ON againI used some double-sided tape to attach
a San
Ace 60 9S0612H4011 to the Innolight controller
 IMG_7431.JPG 
  14609   Wed May 15 10:56:47 2019 gautamUpdatePSLPSL turned ON againTo test the hypothesis that the fan replacement
had any effect on the NPRO shutoff phenomena,
I turned the HEPA on the PSL table down to
  
  14662   Tue Jun 11 00:00:15 2019 MilindHowToPSLSteps to lock the PMCToday, Rana had me key the PSL crate.


Locating the rack:
the crate is 1X1. This
 pmc_locked_settings.pdf 
  14817   Tue Jul 30 09:13:31 2019 gautamUpdatePSLc1psl keyed, Agilent setup cleared
IMC would not lock. c1psl EPICS
channels were unresponsive. I keyed the crate
and went through the usual burtrestore/PMC-relocking
  
  15004   Thu Oct 31 10:44:40 2019 gautamUpdatePSLPMC re-lockedPMC got unlocked at ~4am. I re-locked it.
Also tweaked the input pointing into the
cavity. The misalignment was mostly in pitch.
  
  15005   Sat Nov 2 16:36:55 2019 YehonathanUpdatePSLUp to date sketch of the 1x1 and 1x2 EurocratesI reproduced Gautam's sketch of the
1x1 and 1x2 Eurocrates into a pdf image
that contains links to the appropriate DCCs
 1x1_1X2_Eurocrates_with_links.pdf 
  15006   Sat Nov 2 17:08:34 2019 YehonathanUpdatePSLUp to date sketch of the 1x1 and 1x2 EurocratesThanks. Please update this wiki page too.

https://wiki-40m.ligo.caltech.edu/Electronics/ElectronicsRacks#A1X1
  
  15008   Mon Nov 4 13:26:04 2019 YehonathanUpdatePSLUp to date sketch of the 1x1 and 1x2 EurocratesDone.




  
  15011   Mon Nov 4 19:02:25 2019 YehonathanUpdatePSLMapping the PSL electronicsI created a spreadsheet (Attached) by taking Koji's
c1psl sheet from slow_channel_list and filtering
out the channels that do not need an Acromag.
 PSL_Wirings_-_Sheet1_(1).pdf 
  15017   Wed Nov 6 19:26:57 2019 gautamUpdatePSLSome PSL cable adminKoji and I taked about cleaning up some
of the flaky cable situation on the PSL table
a while ago. The changes were implemented
 PSLcableAdmin.jpg 
  15087   Mon Dec 9 19:19:04 2019 YehonathanUpdatePSLAOM first order beam alignment{Yehonathan, Rana}

In order to setup a ringdown measurement
with perfect extinction we need to align
 20191209_193112.jpg20191209_193203_HDR.jpgimageedit_2_7551928142.gifimageedit_3_5863650538.gif 
  15089   Tue Dec 10 01:24:17 2019 YehonathanUpdatePSLAOM first order beam alignment 




  
  15090   Tue Dec 10 13:26:46 2019 YehonathanUpdatePSLAOM first order beam alignmentnvm the PZT can scan over many GHz.




  
  15091   Tue Dec 10 15:17:17 2019 YehonathanUpdatePSLPMC is locked{Jon, Yehonathan}

We burt-restored the PSL and the
PMC locked immediately.
  
  15092   Tue Dec 10 18:27:22 2019 YehonathanUpdatePSLPMC is locked{Yehonathan, Jon}

We are able to lock the PMC on
the TEM00 mode of the deflected beam.
  
  15093   Wed Dec 11 15:01:57 2019 JonSummaryPSLPMC cavity ringdown measurement[Jon, Yehonathan]

We carried out a set of cavity
ringdown measurements of the PMC. The 1/e
 IMG_0101.jpg 
  15094   Wed Dec 11 15:29:17 2019 YehonathanUpdatePSLPMC is lockedMake sure
to measure the power drop of the beam downstream
  
  15096   Thu Dec 12 19:20:43 2019 YehonathanUpdatePSLPMC cavity ringdown measurement{Yehonathan, Rana, Jon}

To check whether we laser is being
shut fast enough for the ringdown measurement
 IMG_0105.jpegTEK00001.PNG20191212_151642.jpg 
  15097   Fri Dec 13 12:28:43 2019 YehonathanUpdatePSLPMC cavity ringdown measurementI grab the data we recorded yesterday from
the scope and plot it in normalized units (remove
noise level and divide by maximum). See attachment.
 Ringdown_InitialProcess.pdf 
  15098   Mon Dec 16 18:19:42 2019 shrutiUpdatePSLPMC cavity ringdown measurement : beat-note disruptionI have removed the PD55 + ND filter attached
to it (see Attachment) and placed it
next to the oscilloscope, after disconnecting
 IMG_0040.jpg 
  15099   Tue Dec 17 00:23:28 2019 YehonathanUpdatePSLMapping the PSL electronicsI added to the PSL wiring list the
ioo channels and the laser shutter (See attached
pdf for an updated list).
 PSL_Wirings_-_Sheet1_(2).pdf 
  15100   Tue Dec 17 18:05:06 2019 YehonathanUpdatePSLMapping the PSL electronicsUpdated the channel list (Attached):

1. Removed the MC steering mirror
PZT channels
 PSL_Wirings_-_Sheet1_(3).pdf 
  15102   Tue Dec 17 20:45:30 2019 ranaUpdatePSLPMC cavity ringdown measurementidk - I'm recently worried about the
'thermal self locking' issue we discussed.
I think you should try to measure the linewidth
  
  15103   Fri Dec 20 18:33:21 2019 YehonathanUpdatePSLMapping the PSL electronicsFinal (hopefully) PSL channel list is attached
with allocated Acromag channels. Wiring spreadsheet
coming soon.
 PSL_Wirings_-_Channel_List.pdf 
  15104   Mon Dec 23 19:30:20 2019 YehonathanUpdatePSLMapping the PSL electronicsPSL wiring spreadsheet is ready. (But the
link was stripped. Koji)

Link
  
  15105   Fri Dec 27 15:01:02 2019 YehonathanUpdatePSLPMC cavity ringdown measurementI measured PMC ringdowns for several input
powers. I change the input power by changing
the DC voltage to the AOM.
 PDAOMResponse.pdfPMCTransmission.pdfRingdownsAndRefs.pdfTwoExponentialFitAOM0.3V.pdf 
  15106   Fri Dec 27 16:26:11 2019 YehonathanUpdatePSLPMC Linewidth measurementI try to measure the linewidth of the PMC
by ramping the PMC PZT. 

I do it by connecting a triangular
 PMCTransmissionSpectra.pdf 
  15107   Tue Dec 31 03:03:02 2019 gautamUpdatePSLPMC cavity ringdown measurementWhen I was looking at this, the AOM shutdown
time was measured to be ~120 ns, and while
I wasn't able to do a ringdown measurement
  
  15108   Wed Jan 1 04:53:11 2020 gautamUpdatePSLMapping the PSL electronicsFor the IMC servo board, it'd be easiest
to copy the wiring scheme for the BIO bits
as is configured for the CM board (i.e. copy
  
  15109   Wed Jan 1 14:14:00 2020 YehonathanUpdatePSLPMC Linewidth measurementTurns out the 35MHz sidebands are way too
weak to resolve from the resonance when doing
a PZT scan.
 150MHzSideBandCreation.pdfLinewidthMeasurment.pdf 
  15110   Wed Jan 1 16:04:37 2020 YehonathanUpdatePSLMapping the PSL electronicsDone.




  
  15111   Mon Jan 6 15:36:55 2020 JonUpdatePSLAssembly underway for c1psl upgrade[Jon, Yehonathan]

We've begun assembling the
new c1psl Acromag chassis based on Yehonathan's
  
  15112   Mon Jan 6 16:07:12 2020 gautamUpdatePSLAssembly underway for c1psl upgradeRTFE.
Where did the spares go?

  
  15113   Mon Jan 6 19:05:09 2020 not gautamUpdatePSLAssembly underway for c1psl upgradeI found them, thanks. After c1psl, there
are 4 2GB DIMM cards and 1 SSD left. I moved
them into the storage bins with all the other
  
  15114   Tue Jan 7 18:51:51 2020 JonUpdatePSLNew c1psl server assembledI've assembled a new SuperMicro rackmount
machine to replace c1psl. It is currently
set up on the electronics bench.
  
  15115   Fri Jan 10 14:21:19 2020 YehonathanUpdatePSLc1psl rebootPSL controls on the sitemap went blank.
Rebooted c1psl. PSL screens seem normal again.
  
  15116   Fri Jan 10 19:48:46 2020 yehonathanUpdatePSLAssembly underway for c1psl upgrade{Yehonathan, Jon}

I finished pre-wiring the PSL chassis.
I mounted the Acromags on the DIN rails and
 20200110_194429.jpg20200110_194516_HDR.jpg 
  15118   Mon Jan 13 16:05:18 2020 yehonathanUpdatePSLAssembly underway for c1psl upgrade{Yehonathan, Jon}

I configured the Acromag channels
according to the Slow
  
  15119   Mon Jan 13 23:30:53 2020 YehonathanSummaryPSLChanges made since Gautam leftAs per Gautam's request, I list the
changes that were made since he left:

1. The AOM driver was connected
  
  15120   Tue Jan 14 17:16:43 2020 yehonathanUpdatePSLAssembly underway for c1psl upgrade{Yehonathan, Jon}

I isolated a BIO Acromag completely
from the chassis and powered it up. The inverted
  
  15124   Wed Jan 15 10:12:46 2020 gautamUpdatePSLAssembly underway for c1psl upgradeI don't think this is an accurate statement.
XT1111 modules have sinking digital
outputs, while XT1121 modules have sourcing digital
  
  15125   Wed Jan 15 14:10:28 2020 JonConfigurationPSLNew EPICS database for C1PSL + C1IOOSummary

I have completed the
new EPICS channel database for the c1psl
and c1ioo channels
  
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