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  40m Log, Page 26 of 344  Not logged in ELOG logo
ID Date Author Type Categoryup Subject Text Attachments
  15801   Wed Feb 10 17:18:03 2021 KojiSummaryBHDSatellite Amplifier Output Offset measurementsTesting the satellite amp i.e. 
PD driver
- To test the noise of the PD transimpedance
  
  15803   Thu Feb 11 11:10:05 2021 AnchalSummaryBHDSatellite Amplifier Very Low frequency noise After modificationsHere is a proper measurement for PD transimpedance
amplifier circuit in the Satellite amplifier
box D1002818 S2100029. The input from rear
 AfterChangesSpectrum_AC.zipD1002818_S2100029_OutputNoiseSpecAfterChanges.pdfD1002818_S2100029_InputRefCurrentNoiseSpecAfterChanges.pdfD1002818_S2100029_InputRefDispNoiseSpecAfterChanges.pdf 
  15804   Thu Feb 11 16:58:52 2021 ranaSummaryBHDSatellite Amplifier Very Low frequency noise After modificationsI expect that a single OSEM channel can't
be better than 1e-10 m/rHz above 5 Hz, so
probably something wrong in the calibration.
  
  15808   Tue Feb 16 13:13:39 2021 YehonathanUpdateBHDSOS assemblyGautam pointed out that there are extra
Sm-Co magnets stored in the clean optics
cabinet.
  
  15810   Tue Feb 16 15:29:01 2021 KojiUpdateBHDSOS assemblyThe curie temp of SmCo seems about x2 (in
K) of the one for NdFeB. i.e. 600K vs 1000K.
So I believe 177degC = 450K is not an issue.
  
  15811   Tue Feb 16 22:59:36 2021 YehonathanUpdateBHDSOS assemblyDone.

Also, the magnets are nickel-plated.
I guess that doesn't matter for the baking
  
  15821   Fri Feb 19 12:21:04 2021 YehonathanUpdateBHDSOS assemblyA summary of things that need to be fabricated/purchased/done:




  
  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 
  15909   Fri Mar 12 03:23:37 2021 KojiUpdateBHDDO card (DO-32L-PE) brought from WBI've brought 4 DO-32L-PE cards from
WB for BHD upgrade for Jon.
 P_20210311_232742.jpgP_20210311_232752.jpg 
  15922   Tue Mar 16 14:37:36 2021 YehonathanUpdateBHDSOS SmCo magnets InspectionIn the cleanroom, I opened the nickel-plated
SmCo magnet box to take a closer look. I
handled the magnets with tweezers. I wrapped
 20210316_142906.jpg20210316_165626.jpg20210316_165838.jpg 
  15931   Wed Mar 17 14:40:39 2021 YehonathanUpdateBHDSOS SmCo magnets InspectionContinuing with envelope number 2




Magnet
  
  15964   Thu Mar 25 14:58:16 2021 YehonathanUpdateBHDSOS SmCo magnets InspectionRedoing magnet measurement of envelope
1:

  
  15969   Fri Mar 26 10:25:37 2021 YehonathanUpdateBHDSOS assemblyI measure some of the dowel pins we got
from Mcmaster with a caliper.

One small pin is 0.093" in
  
  15999   Tue Apr 6 15:42:57 2021 YehonathanUpdateBHDSOS assemblyWe got some dumbells from Re-Source Manufacturing
(see attached). I picked 3 in random and
measured their dimensions:
 20210406_150724.png 
  16011   Fri Apr 9 20:54:54 2021 YehonathanUpdateBHDSOS assemblyToday I assembled the skeleton of 6 towers,
without clamps and sensor assembly (attachment
1).
 20210409_202717.jpg20210409_202755.jpg 
  16018   Mon Apr 12 17:30:11 2021 YehonathanUpdateBHDSOS assemblyToday, I screwed the plungers on the sensor
plates and installed them on the Towers.
I also installed the wire clamps on the suspension
 20210412_170913.jpg 
  16111   Mon May 3 16:49:04 2021 YehonathanUpdateBHDSOS assemblyI found a "vice" in the cleanroom
(attachment 1). I used it to push dowel pins
into the last suspension block using some
 20210503_161422.png20210503_161456.jpg 
  16158   Mon May 24 20:55:00 2021 KojiSummaryBHDHow to align two OMCs on the BHD platform?Differential
misalignment of the OMCs

40m BHD will employ two OMCs on
  
  16170   Tue Jun 1 16:17:06 2021 YehonathanUpdateBHDSOS assemblyI tried to push the clean Viton tips into
the vented screws just to find out that the
vented holes are too small. We need to drill
  
  16172   Wed Jun 2 01:03:19 2021 KojiUpdateBHDSOS assemblyCan you just cut the viton tips smaller?
If you cut it to have some wedge (or say,
taper), it can get stuck with the vent hole.
  
  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 
  16215   Fri Jun 18 19:02:00 2021 YehonathanUpdateBHDSOS assemblyToday I glued some magnets to dumbells.

First, I took 6 magnets (the maximum
I can glue in one go) and divided them into
 20210618_115017.jpgUntitled_2.png20210618_160041_HDR.jpg 
  16216   Fri Jun 18 23:53:08 2021 KojiUpdateBHDSOS assemblyThen, can we replace the four small EQ
stops at the bottom (barrel surface) with
two 1/4-20 EQ stops? This will require drilling
  
  16221   Tue Jun 22 17:05:26 2021 YehonathanUpdateBHDSOS assemblyAccording to the schematics,
the distance between the original EQ tap
holes is 0.5". Given that the original
  
  16227   Mon Jun 28 12:35:19 2021 YehonathanUpdateBHDSOS assemblyOn Thursday, I glued another set of 6 dumbells+magnets
using the same method as before. I made sure
that dumbells are pressed onto the magnets.
 toomuchglue1.pngtoomuchglue2.pngdirtydumbell.pngcleandumbell.pngassembly_on_metalbracket.png 
  16229   Tue Jun 29 20:45:52 2021 YehonathanUpdateBHDSOS assemblyI glued another batch of 6 magnet+dumbell
assemblies. I will take a look at them under
the microscope once they are cured.
 20210629_135736.jpg20210629_135746.jpg 
  16235   Thu Jul 1 16:45:25 2021 YehonathanUpdateBHDSOS assemblyThe bonding test passed - the weight still
hangs from the dumbell. Unfortunately, I
broke the bond trying to release the assembly
  
  16259   Tue Jul 27 17:14:18 2021 YehonathanUpdateBHDSOS assemblyJordan has made 1/4" tap holes in
the lower EQ stop holders (attachment). The
1/4" stops (schematics)
 20210727_154506.png 
  16260   Tue Jul 27 20:12:53 2021 KojiUpdateBHDSOS assembly1 or 2. The stained ones are just fine.
If you find the vented 1/4-20 screws in the
clean room, you can use them.
  
  16262   Wed Jul 28 12:00:35 2021 YehonathanUpdateBHDSOS assemblyAfter receiving two new tubes of EP-30
I resumed the gluing activities. I made a
spreadsheet
  
  16271   Fri Aug 6 13:13:28 2021 AnchalUpdateBHDc1teststand subnetwork now accessible remotelyc1teststand subnetwork is now accessible
remotely. To log into this network, one needs
to do following:
  
  16273   Mon Aug 9 10:38:48 2021 AnchalUpdateBHDc1teststand subnetwork now accessible remotelyI had to add following two lines in the
/etc/network/interface file to make the special
ip routes persistent even after reboot:
  
  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 
  16344   Mon Sep 20 14:11:40 2021 KojiUpdateBHDEnd DAC Adapter Unit D2100647I've uploaded the schematic and PCB
PDF for End DAC Adapter Unit D2100647.

Please review the design.
 D2100647_End_DAC_Adapter.pdf 
  16359   Thu Sep 23 18:18:07 2021 YehonathanUpdateBHDSOS assemblyI have noticed that the dumbells coming
back from C&B had glue residues on them.
An example is shown in attachment 1: it can
 dumbell_before.pngdumbell_after.png 
  16370   Fri Oct 1 12:12:54 2021 StephenUpdateBHDITMY (3002) CAD layout pushed to BoxKoji requested current state of BHD 3D
model. I pushed this to Box after adding
the additional SOSs and creating an EASM
 3002_20211001_ITMY_BHD_for_Koji_presentation_images.easm40m_upgrade_layout_20200611-ITMY_Beam_Dim.pdf 
  16424   Mon Oct 25 13:23:45 2021 AnchalSummaryBHDBefore photos of BSC[Yehonathan, Anchal]

On thursday Oct 21 2021, Yehonathan
and I opened the door to BSC and took some
  
  16425   Mon Oct 25 17:37:42 2021 AnchalSummaryBHDPart I of BHR upgrade - Removed optics from BSC[Anchal, Paco, Ian]


Clean room etiquettes


Two
people in coverall suits, head covers, masks
 rn_image_picker_lib_temp_44cb790a-c3b4-42aa-8907-2f9787a02acd.jpgrn_image_picker_lib_temp_0fd8f4fd-64ae-4ccd-8422-cfe929d4eeee.jpg 
  16426   Tue Oct 26 10:17:14 2021 YehonathanUpdateBHDSOS assemblyThings that I need to start suspending
optics:

1. Winch adapter plate (D970314).
  
  16429   Tue Oct 26 16:56:22 2021 PacoSummaryBHDPart I of BHR upgrade - Locked PMC and IMC[Paco, Ian]

We opened
  
  16431   Wed Oct 27 16:27:16 2021 AnchalSummaryBHDPart II of BHR upgrade - Prep[Anchal, Paco, Ian]

Before we could start working on
Part II, which is to relocate TT2 to new
 OMCNorthBefore.jpegOMCNorthAfter.jpeg 
  16432   Wed Oct 27 16:31:35 2021 AnchalSummaryBHDPart III of BHR upgrade - Removal of PR2 Small SuspensionI went inside the ITMX Chamber to read
off specs from PR2 edge. This was required
to confirm our calculations of LO power for
  
  16433   Wed Oct 27 16:38:02 2021 AnchalSummaryBHDPart II of BHR upgrade - Relocation of TT2 and MMT1/2 alignment[Anchal, Paco]

We opened BSC and Injection Chamber
doors. We removed two stacked counterweights
  
  16434   Wed Oct 27 18:11:37 2021 KojiSummaryBHDPart II of BHR upgrade - Relocation of TT2 and MMT1/2 alignmentClosed the PSL shutter @18:11
During the vent, we want to keep the
cavity unlocked if not necessary.
  
  16435   Wed Oct 27 18:16:45 2021 KojiSummaryBHDPart II of BHR upgrade - Relocation of TT2 and MMT1/2 alignment- Moving the MMT2 south by a cm is fine.
This will give you ~0.5cm at TT1 without
changing the other alignment much.
  
  16437   Thu Oct 28 16:32:32 2021 PacoSummaryBHDPart IV of BHR upgrade - Removal of BSC eastern optics[Ian, Paco, Anchal]

We turned off the BSC oplev laser
by turning the key counterclockwise. Ian
  
  16438   Thu Oct 28 17:01:54 2021 AnchalSummaryBHDPart III of BHR upgrade - Adding temp fixed flat mirror for PR2[Anchal, Paco, Ian]


We added a Y1-2037-0 mirror
(former IPPOS SM2 mirror) on a fixed mount
  
  16439   Thu Oct 28 23:13:19 2021 YehonathanUpdateBHDSOS assembly{Tega, Yehonathan, Koji}

Suspension
 OpLev_Setup.jpgsuspended_optic.png20211029_113011.jpg20211029_113052.jpg 
  16440   Fri Oct 29 14:39:37 2021 AnchalSummaryBHD1Y1 cleared. IY3 ready for C1SUS2 I/O and FE.[Anchal, Paco]

We cleared 1Y1 rack today removing
the following items. This stuff is sitting
 RemovedStuff.jpeg1Y1.jpeg1Y3.jpeg 
  16443   Tue Nov 2 15:02:03 2021 YehonathanUpdateBHDSOS assembly{Yehonathan, Tega}

We took the free-swinging spectra
of the OpLev in the X and Y direction.
 FreeSwingingSpectra.pdf 
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