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ID Date Author Type Category Subjectup Text Attachments
  13772   Thu Apr 19 20:41:09 2018 KojiConfigurationGeneralAux Laser LD dying? (AS port laser injection)I suspect
that the LD of the aux laser is dying.
- The max power we obtain from this
 Aux_laser_adj_Pout.pdfAux_laser_RIN.pdf 
  13781   Tue Apr 24 08:36:47 2018 johannesConfigurationGeneralAux Laser LD dying? (AS port laser injection)In September
2017 I measured ~150mW output power,
which was already kind of low. What are the
  
  12106   Thu May 5 04:05:03 2016 ericqUpdateLSCAux X PDH checksWe took an OLG measurement of the green
PDH loop. It seems consistent with past measurements.
I've added a trace for the the post-mixer
 nom_noise.pngnom_olg.png 
  8244   Wed Mar 6 18:51:07 2013 AnnalisaUpdateAlignmentAuxiliary laser installed for FSR and TMS measurement of the PRCWe want to measure the g-factor of the
PRC using the beat note of the main laser
with an auxiliary NPRO laser.
 IMG_3-6-13.JPG 
  8313   Tue Mar 19 20:24:56 2013 AnnalisaUpdateAuxiliary lockingAuxiliary laser on PSL table I moved the auxiliary laser from
the ITMY table to the PSL table and installed
all the optics (mirrors and lenses) to steer
  
  342   Wed Feb 27 22:05:03 2008 JohnUpdateLSCAuxiliary lockingA summary of the status of the auxiliary arm
locking effort.
  
  16341   Fri Sep 17 00:56:49 2021 KojiUpdateGeneralAwesomeThe
Incredible Melting Man!

 
  
  11509   Fri Aug 14 23:49:34 2015 KojiSummaryGeneralB&K Shaker fixedI fixed a shaker that was claimed to be
broken. I had to cut the rubber membrane
to open the head.
 IMG_1947.JPG 
  10009   Mon Jun 9 10:55:48 2014 NichinSummaryElectronicsBBPD D1002969-v8 transimpedence measurementMy SURF
week-1 work...
 PD_transimpedence_measurement.pngresults.pdfcode_and_data.zip 
  10012   Mon Jun 9 16:55:31 2014 KojiSummaryElectronicsBBPD D1002969-v8 transimpedence measurementHow is the modulation depth assumed in
the calculation?
If you don't know the modulation
  
  10058   Wed Jun 18 15:25:06 2014 NichinUpdateElectronicsBBPD Transimepedence plot Motivation:  BBPD.pngBBPD_readings_06-18-2014.zip 
  10087   Sat Jun 21 01:46:28 2014 NichinUpdateElectronicsBBPD Transimepedence plotSorry for
the late update Koji.
There
 BBPD_06-18-2014.pdfBBPD_readings_06-18-2014.zip 
  10059   Wed Jun 18 16:44:55 2014 ManasaUpdateElectronicsBBPD installed for BEATX detectionThis BBPD is the spare that we pulled out
and is installed for ALSX-PSL beat note detection.
  
  17319   Mon Nov 28 18:21:50 2022 PacoSummaryBHDBH44 prepI checked the LSC rack to evaluate what
we might need to generate 44 MHz rf in the
hypothetical case we go from BH55 to BH44
  
  17152   Thu Sep 22 19:51:58 2022 AnchalUpdateBHDBH55 LSC Model Updates - part III updated follwoing in teh rtcds models
and medm screens:


c1lsc

Added
  
  17157   Fri Sep 23 19:04:12 2022 AnchalUpdateBHDBH55 LSC Model Updates - part IIIBH55

I further
updated LSC model today with following changes:


BH55 whitening switch binary
  
  17165   Thu Sep 29 18:01:14 2022 AnchalUpdateBHDBH55 LSC Model Updates - part IVMore model changes

c1lsc:


BH55_I and BH55_Q are now
being read at ADC_0_14 and ADC_0_15. The
  
  17191   Fri Oct 14 17:04:28 2022 RadhikaUpdateBHDBH55 Q abnormality + fix[Yuta, Anchal, Radhika]

Yesterday we attempted to lock
MICH and BHD using the BH55_Q_ERR signal.
 IMG_3805.jpegIMG_3807.jpegBH55_IQDemodMeasuredDiff_1349737773.png 
  17195   Mon Oct 17 20:04:16 2022 AnchalUpdateBHDBH55 RF output amplified[Radhika, Anchal]

We have added an RF amplifier to
the output of BH55. See the MICH signal on
 BH55_RF_Amp_Working.pngrn_image_picker_lib_temp_1b072d08-3780-4b1d-9325-5795ed099d3d.jpgrn_image_picker_lib_temp_9d7ed3c0-7ff0-4ff7-9349-0211be397dc5.jpgrn_image_picker_lib_temp_05da14e1-eae0-4a84-8761-1c42b122cb1b.jpg 
  17196   Mon Oct 17 22:27:25 2022 ranaUpdateBHDBH55 RF output amplified1) please remember to follow the loading
and power up instructions to avoid destroying
our low noise RF amplifiers. Its not as easy
  
  17200   Wed Oct 19 11:09:20 2022 RadhikaUpdateBHDBH55 RF output amplified[Anchal, Radhika]

We selected a 102K (1 nF) ceramic
capacitor and a 100 uF electrolytic capacitor
 IMG_3840.jpegIMG_3847.jpeg 
  17174   Thu Oct 6 11:12:14 2022 AnchalUpdateBHDBH55 RFPD installation complete[Yuta, Paco, Anchal]

BH55 RFPD installation was still
not complete until yesterday because of a
  
  17150   Wed Sep 21 17:01:59 2022 PacoUpdateBHDBH55 RFPD installed - part I[Radhika, Paco]

Optical path setup

We
realized the DCPD - B beam path was already
 IMG_3760.jpegIMG_3764.jpeg 
  17155   Fri Sep 23 14:10:19 2022 RadhikaUpdateBHDBH55 RFPD installed - part I[Radhika, Paco, Anchal]

I placed a lens in the B-beam
path to focus the beam spot onto the RFPD
 IMG_3766.jpegIMG_3770.jpegIMG_3773.jpeg 
  17156   Fri Sep 23 18:31:46 2022 ranaUpdateBHDBH55 RFPD installed - part IA design flaw in these initial LIGO RFPDs
is that the SMA connector is not strain releieved
by mounting to the case. Since it is only
  
  17159   Mon Sep 26 11:39:37 2022 PacoUpdateBHDBH55 RFPD installed - part II[Paco, Anchal]

We followed rana's suggestion
for stress relief on the SMA joint in the
 PXL_20220926_175010061.MOTION.jpgBH55_Transimpedance_Measurement.pdf 
  17176   Thu Oct 6 18:50:57 2022 AnchalSummaryBHDBH55 meas diff angle estimation and LO phase lock attempts[Yuta, Paco, Anchal]

BH55 meas diff

We
estimated meas diff angle for BH55 today
  
  17203   Fri Oct 21 10:37:36 2022 AnchalSummaryBHDBH55 phase locking effortsAfter the amplifier was modified with a
capacitor, we continued trying to approach
locking LO phase to in quadrature with AS
  
  17205   Sat Oct 22 21:36:28 2022 ranaSummaryBHDBH55 phase locking effortsgive us an animated GIF of this cool new
tool! - I'm curious what happens if you
look at 2 DoF of the same suspension. Also
  
  15524   Fri Aug 14 00:01:55 2020 gautamUpdateCDSBHD / OMC model channels now added to autoburtI added the EPCIS channels for the c1omc
model (gains, matrix elements etc) to the
autoburt such that we have a record of these,
  
  16954   Tue Jun 28 14:24:23 2022 yutaUpdateBHDBHD DC PD signals now also sent to c1lsc to circumvent IPC error[JC, Yuta]

To circumvent IPC error sending
BHD DC PD signals from c1sus2 to c1lsc, DB9
 C1LSC.JPGC1SUS2.JPGScreenshot_2022-06-28_16-03-16_BHDDCPDcopied.png 
  17265   Mon Nov 14 17:45:02 2022 yutaUpdateBHDBHD DC PD unwhitening and removing cables to c1lsc[Paco, Yuta]

We removed splitter to route BHD DC
 Screenshot_2022-11-15_13-08-17.png 
  16932   Tue Jun 21 14:17:50 2022 yutaConfigurationBHDBHD DCPDs re-routed to c1sus2After discussing with Anchal, we decided
to route BHD related PD signals directly
to ADC of c1sus2, which handles our new suspensions
 C1X07ADC1.JPGBHDDCPDs.JPG 
  17034   Mon Jul 25 18:09:41 2022 TegaConfigurationBHDBHD Homodyne Phase control MEDM screen[Paco, Tega, Yuta]

Today, we made a custom MEDM screen
for the BHD Homodyne Phase Control, which
 Screen_Shot_2022-07-25_at_6.12.08_PM.pngScreen_Shot_2022-07-25_at_6.18.09_PM.png 
  17024   Wed Jul 20 18:07:52 2022 PacoUpdateBHDBHD MICH test[Paco, Yuta, JC]

We did some easy tests on the BHD
readout in preparation for BHD MICH. With
 BHD_MICH_OSC.pdf 
  17037   Tue Jul 26 20:54:08 2022 PacoUpdateBHDBHD MICH test - LO phase control[Yuta, Paco]


TL;DR
Successfully
 20220726_BICHD.pdf 
  15357   Tue May 26 19:19:30 2020 HangUpdateBHDBHD MM-- effects of astigmatismPlease see the attached doc. 

I think the conclusion is that
if the AS1 RoC error is not significantly
 MM.pdf 
  15684   Mon Nov 23 12:25:14 2020 gautamUpdateBHDBHD MMT Optics deliveredOptics --> Cabinet at south end (Attachment #1)  IMG_8965.HEIC 
  15685   Mon Nov 23 14:52:10 2020 KojiUpdateBHDBHD MMT Optics deliveredBasically, they repeated our specs and
showed the coating performances for HR/AR
for 10deg P and PR/AR for 45deg P. There
  
  16198   Fri Jun 11 20:19:50 2021 KojiSummaryBHDBHD OMC invacuum wiringStephen and I discussed the in-vacuum OMC
wiring.

- One of the OMCs has already been
 40mBHD_OMC_wiring.pdf 
  16318   Thu Sep 9 09:54:41 2021 StephenSummaryBHDBHD OMC invacuum wiring - cable lengths[Koji, Stephen - updated 30 September]

Cable lengths task - in vacuum
cabling for the green section (new, custom
 bhd_cable_length_check_cable_bracket_to_components.pngbhd_cable_length_check_flange_to_cable_bracket.pngbhd_cable_length_check_cable_bracket_to_omc_bracket.png 
  16839   Mon May 9 22:19:06 2022 KojiUpdateBHDBHD Platform Progress status[Don, Koji]

Don is working on finalizing the
BHD Platform design. All the components on
 Screenshot_2022-05-09_220220.pngScreenshot_2022-05-09_222405.png 
  16840   Mon May 9 23:18:44 2022 KojiUpdateBHDBHD Platform Progress statusI quickly ran the FEA model to check the
resonant freqs of the BHD platform.
The boundary conditions were:
 6x 
  15901   Thu Mar 11 02:10:06 2021 KojiSummaryBHDBHD Platform vertical dimentionsStephen and I discussed the nominal heights
of the BHD platform components.


The beam height from the
 BHD_Platform_Vertical_Dimentions.pdf 
  16785   Mon Apr 18 16:09:07 2022 YehonathanUpdateBHDBHD Readout simulationI'm planning on simulating the BHD
readout noise in a manner very similar to
the ALS noise model using Simulink. I've
 BHD_Simulink_Sketch.drawio.pdf 
  16828   Tue May 3 21:07:17 2022 YehonathanUpdateBHDBHD Readout simulationI feel like there is an instability in
my thought process on this. Before my tendency
to try to scale and generalize this problem
  
  16834   Thu May 5 17:50:48 2022 YehonathanUpdateBHDBHD Readout simulationI have made a Simulink diagram to use in
the MICH modeling (attachment) for the homodyne
angle detection scheme. The model will be
 BHD_controls_40m_MICH.pdf 
  17264   Mon Nov 14 14:52:56 2022 PacoConfigurationSUSBHD SUS Coil output balance[JC, Paco]

We installed a steering mirror
intersecting the BHD beam path and put the
 PXL_20221114_224829547~2.jpgScreenshot_2022-11-14_16-07-26_AS1CoilBalancing.pngScreenshot_2022-11-14_16-23-17_AS4CoilBalancing.pngScreenshot_2022-11-14_16-38-16_LO1CoilBalancing.pngScreenshot_2022-11-14_16-54-14_LO2CoilBalancing.png 
  16815   Wed Apr 27 16:28:57 2022 AnchalSummaryBHDBHD Upgrade - Retreiving arm cavity alignment[Anchal, Paco, JC]

We had to open ITMY, ETMY chamber
doors to get the cavity aligned again. Once
  
  15540   Wed Aug 26 00:52:55 2020 gautamUpdateBHDBHD activitiesListing some talking points from the last
week of activity here.


  
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