 Tue Oct 22 15:54:59 2019, Koji, Electronics, Loan / Lending, Borrowed LB1005 from Cryo Cav
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From Cryo Cav setup
Borrowed LB1005 Servo box -> OMC
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Fri Dec 6 00:55:25 2019, Koji, Optics, General, Beamdump gluing 6x
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[Stephen, Koji]
20 glass beamdumps were bonded at the 40m cleanroom.
Attachment 1: We had 20 fused silica disks with a V-groove and 40 black glass pieces |
 Wed Dec 18 21:54:53 2019, Koji, General, General, OMC Beam Dump Production Cure Bake
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The beamdumps were taken out from the oven and packed in bags.
The bottom of the V are completely "wet" for 17 BDs among 20 (Attachment 1/2).
3 BDs showed insufficient glue or delamination although there is no sign of lack of rigidity. They were separated from the others in the pack. |
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Thu Feb 27 14:31:13 2020, Koji, General, General, Item lending
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Item lending as per Ian's request: Particle Counter from OMC Lab to QIL
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Mon Aug 10 15:29:54 2020, Koji, General, General, Item lending
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The particle counter came back to the OMC lab on Aug 10, 2020
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Mon Aug 10 15:34:04 2020, Koji, Facility, Loan / Lending, Glue bake oven
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| Black and Decker Glue Baking Oven came back to the OMC lab on Aug 10, 2020, Georgia had lent the unit for the SAMS assembly/testing. |
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Mon Aug 10 15:53:46 2020, Koji, General, General, Lab status check
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Check-in to the OMC lab to see the status. Nothing seemed changed. No bug. The HEPA is running normal. The particle level was 0.
Went into the HEPA enclosure and put a cover on the OMC. Because of the gluing template, the lid could not be close completely (that's expected
and fine). |
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Mon Sep 28 16:13:08 2020, Koji, General, General, OMC Beam Dump Production Cure Bake
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According to the past backscatter test of the OMC (and the black glass beamdump: not V type but triangular type on a hexagonal-mount), the upper limit
of the back reflection was 0.13ppm. https://nodus.ligo.caltech.edu:8081/OMC_Lab/209
I don't have a BRDF measurement. We can send a few black glass pieces to Josh. |
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Thu Oct 8 19:55:22 2020, Koji, General, Characterization, Power Measurement of Mephisto 800NE 1166A
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The output of Mephisto 800NE (former TNI laser) was measured.
The output power was measured with Thorlabs sensors (S401C and S144C). The reference output record on the chassis says the output was 837mW at 2.1A
injection. |
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Fri Oct 9 01:01:01 2020, Koji, General, General, TFT Monitor mounting
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To spare some room on the optical table, I wanted to mount the two TFT monitor units on the HEPA enclosure frame.
I found some Bosch Rexroth parts (# 3842539840) in the lab, so the bracket was taken for the mount. This swivel head works very well. It's rigid
and still the angle is adjustable. |
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Fri Oct 16 00:53:29 2020, Koji, General, General, TFT Monitor mounting
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The image flipping of the display unit was fixed. The vendor told me how to fix it.
- Open the chassis by the four screws at the side.
- Look at the pass-through PCB board between the mother and display boards. |
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Fri Oct 23 19:09:54 2020, Koji, General, General, Particle counter transfered to Radhika
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| See this entry: https://nodus.ligo.caltech.edu:8081/40m/15642 |
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Fri Nov 6 18:38:00 2020, Koji, General, General, Powermeter lent from OMC Lab to 2um ECDL
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Thorlabs' powermeter controler + S401C head was lent from OMC Lab. Returned to OMC Jul 15, 2022 KA
https://nodus.ligo.caltech.edu:8081/SUS_Lab/1856 |
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Mon Nov 9 22:06:18 2020, Koji, Mechanics, General, 5th OMC Transport Fixture
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I helped to complete the 5th OMC Transport Fixture. It was built at the 40m clean room and brought to the OMC lab. The fixture hardware (~screws) were
also brought there. |
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Fri Nov 20 18:51:23 2020, Koji, General, General, Instrument loan
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FEMTO DLPCA200 low noise preamp (brand new)
Keithley Source Meter 2450 (brand new) => Returned 11/23/2020
were brought to the OMC lab for temporary use. |
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Sat Nov 21 13:58:30 2020, Koji, Electronics, Characterization, Dark Current Measurement for InGaAs QPDs
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Dark current measurement for InGaAs QPDs (OSI FCI-InGaAs-Q3000) has been done using Keithley 2450 and Frank's diode test kit. Frank's setup uses
various custom instruments which are no longer exist, therefore the kit was used only for switching between the segments.
The diodes were serialized as 81, 82, 83, 84, continuing the numbering for the OMC QPDs. The numbers are engraved at the side and the back of |
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Sun Nov 22 13:49:12 2020, Koji, Electronics, Characterization, Impedance Measurement for InGaAs QPDs
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To know any anomaly to the junction capacitance of the QPD segments, the RF impedances were tested with a hand-made impedance measurement.
All segments look almost identical in terms of capacitance.
Measurement setup: |
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Mon Nov 23 23:17:19 2020, Koji, Electronics, Characterization, The dark noise of the Q3000 QPDs
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The dark noise levels of the four Q3000 QPDs were measured with FEMTO DLPCA200 low noise transimpedance amp.
The measurement has been done in the audio frequency band. The amp gain was 10^7 V/A. The reverse bias was set to be 5V and the DC output of
the amplifier was ~40mV which corresponds to the dark current of 4nA. It is consistent with the dark current measurement. |
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Tue Nov 24 12:27:18 2020, Koji, Electronics, Characterization, The dark noise of the Q3000 QPDs
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The amplifier BW was 400kHz at the gain of 1e7 V/A. And the max BW is 500kHz even at a lower gain. I have to setup something special to see the RF band
dark noise.
With this situation, I stated "the RF dark noise should be characterized by the actual WFS head circuit." in the 40m ELOG. |
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Thu May 20 17:03:50 2021, Koji, General, General, SRS LCR meter SRS720 borrowed from Downs
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Item loan: SRS LCR meter SRS720 borrowed from Downs. The unit is at the 40m right now for testing with an excelitas PD. Once it is done, the setup will
be moved to the OMC lab for testing the high QE PDs |
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Sun May 30 15:17:16 2021, Koji, General, General, DCPD AF capacitance measirement
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Attachment 1: System diagram. The reverse bias voltage is controlled by DS335. This can produce a voltage offset up to 10V. A G=+2 opamp
circuit was inserted so that a bias of up to +15V can be produced. The capacitances of the photodiodes were measured with SR720 LCR meter with a probe.
DS335 and SR720 were controlled from PC/Mac via serial connections. |
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Sun May 30 15:32:56 2021, Koji, General, General, DCPD AF capacitance measirement
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Measurement result:
The capacitance at no bias was 460~500pF. This goes down to below 300pF at 1.0~1.5V reverse bias. At maximum +15V, the capacitance goes down
to 200~220pF. |
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Thu Jun 23 21:03:33 2022, Koji, Facility, General, Moving the small optical table to CAML (TCS Lab)
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I've cleared the small optical table and wondered how to move it out of the room. Fortunately, the north side of the big table had wide enough clearance
and let the 36" wide table go through. This was easy without moving other heavy stuff.
From here to the door, a bit of work is required. A possibility is to roll the laser blocking wall to the south side of the big table. This will |
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Tue Jun 28 16:13:34 2022, Koji, General, General, The small optical table not small enough to get out
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The table width was an inch too large compared to the door width. We need to tilt the table and it seemed too much for us. Let's ask the transportation
for handling.
Photo courtesy by Juan |
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Fri Jul 15 22:14:14 2022, Koji, General, General, OMC Lab recovery for the OMC #002 test
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- The lab is chilly (18degC)
- Cleaned the lab and the optical table a bit so that the delicate work can be done. The diode test rig (borrowed from Downs - see OMC
ELOG 408 and OMC ELOG 409) was removed from the table and brought to the office (to return |
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Mon Jul 18 14:20:09 2022, Koji, General, General, OMC #002 Plan Portal
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== Initial Preparation ==
[Done] OMC #002 placement
[Done] OMC #002 locking
Details OMC
ELOG 414
== Measurements == |
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Tue Jul 19 03:17:56 2022, Koji, General, General, OMC #002 Power Budget before mirror cleaning
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o Power Budget (2022/07/18)
NPRO ADJ -50 (min)
Fiber incident 62.8mW |
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Thu Jul 21 02:55:06 2022, Koji, General, General, OMC #002 Power Budget after mirror cleaning
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o Power Budget after FirstContact cleaning (2022/07/20)
NPRO ADJ -50 (min)
Fiber incident --.-mW |
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Thu Jul 21 13:21:27 2022, Koji, General, Configuration, Windows laptop for WincamD Beam'R2 recovery
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The Windows laptop for WincamD/Beam'R2 (DELL Vostro3300) was not functional.
- Windows 7 got stuck in the starting up process (Google "startup repair loop")
- The battery can't charge and the adapter connection is flaky |
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Thu Jul 21 14:35:35 2022, Koji, General, General, Bond reinforcement blocks for the invar brackets
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Bond reinforcement blocks for the invar brackets:
Attachment 1: CLASS A glass prisms (the surplus of the 2016 repair)
Attachment 2: Dirty
reiforcement bars made of Aluminum
There are also many dirty prisms in the kit obtained from Stephen
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Thu Jul 21 14:55:48 2022, Koji, General, General, Optics bonding for the backscatter measurement
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The backscatter beam is supposed to appear in the backpropagation path. The transmission of the OMC has a couple of optics, it's not easy to access
that beam.
To try to deflect the beam either horizontally or vertically, small optical pieces were made. (Attachment) |
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Thu Jul 21 17:47:00 2022, Koji, General, General, The profile of the beam incident on the fiber input coupler
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The profile of the beam incident on the fiber input
The fiber input was deflected by a 45deg mirror. The beam profile was measured with WincamD. The beam was too strong (~60mW) even at the smallest
pump power (ADJ -50) of the NPRO. So the two ND20 filters were added to the lens right before the 45 deg mirror and the camera. |
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Fri Jul 22 00:31:17 2022, Koji, General, General, OMC #002 backscatter measurement
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Measure the power ratio between the forward-propagating and reverse-propagating beams.
Place a small deflecting mirror at the transmission.
Place a flat mirror at the deflected transmission. When the alignment
of this mirror is adjusted to retroreflect this beam, the DC of the cavity reflection PD increases, and also the CCD shows spurious fringes.
This |
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Fri Jul 22 17:41:01 2022, Koji, General, General, SRS LCR meter SRS720 returned to Downs
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SRS LCR meter SRS720 was returned to Downs as before.
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Fri Jul 22 17:47:38 2022, Koji, General, General, C&B request for the reinforcement blocks
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OMC Reinforcement blocks
1. P/N D1600316; Version v4; Type 01; Qty 30; Source Chemistry Machine Shop
2. P/N D1600316; Version v4; Type 02; Qty 15; Source Chemistry Machine Shop |
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Mon Jul 25 18:25:04 2022, Koji, General, General, A/C Filter was replaced
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New filter PN
Grainger
TK70457312T Mini-Pleat Air Filter, Style - Air Filters Box, Performance Rating MERV 14, Nominal Filter Size 12x24x2
Previous |
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Tue Jul 26 00:01:59 2022, Koji, General, General, OMC #002 delamination check 2
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More epoxy delamination check:
DCPD R (Attachment 1): Found half delaminated
DCPD T (Attachment 2): Found half delaminated |
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Tue Jul 26 00:12:58 2022, Koji, General, General, High QE PD: QE measurements
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- Installed the High QE PDs to OMC #002
B1-22@Cage B1 was installed to the transmission DCPD
B1-23@Cage B1 was installed to the reflection
DCPD
Upon the installation, the legs of the PDs were cut by 3mm. Also, the tab of the PD could not be embedded in the DCPD housing. |
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Wed Jul 27 10:09:51 2022, Koji, General, General, 4+4 wire clamp in hand
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Regarding: D1200971
- 4 CLASS A wire clamp obtained from the OMC spare
- 4 more DIRTY wire clamp obtained from WB experiments (they no longer use these) |
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Wed Jul 27 10:34:09 2022, Koji, General, General, High QE PD: QE measurements 2
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- DLPCA-200 trans-impedance amplifier was calibrated.
Keithley source meter 2450 was connected to the amp. Provide current and read the output voltage with the precision digital voltage meter
(Agilent/Keysight). |
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Wed Jul 27 10:34:30 2022, Koji, General, General, OMC #002 Protective FirstContact Paint
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The optical surfaces were coated with FirstContact to keep them clean / somewhat protected during the transportation.
The PD aperture was sealed with FirstContact "caps" (made by Kate in 2016?). |
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Wed Jul 27 23:52:18 2022, Koji, General, General, OMC #002 Cable bracket replacement (1)
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Parts check
- D1300052-V3 SN001 is going to be used (Attachment 1)
- This is the PEEK version of the cable bracket (Attachment 2). The side thread holes have no Helicoils inserted. This |
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Thu Jul 28 00:28:15 2022, Koji, General, General, OMC #002 Cable bracket replacement (2)
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Connector unmounting
- (Attachment 1) The connector nut rings were removed using an angled needle nose plier. The connector shell has a tight dimension
relative to the hole on the bracket. But of course, they could be extracted. |
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Thu Jul 28 00:46:47 2022, Koji, General, General, Subject: OMC #002 Cable bracket replacement (3)
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Checking the spare parts
- Conclusion for OMC#2: need PEEK cable ties
- for more OMCs: need more BHCS / PEEK cable ties / Helicoils |
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Wed Aug 10 18:42:27 2022, Koji, General, General, OMC #002 Cable bracket replacement (4)
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[Stephen Koji]
Now we got the C&Bed parts to continue to work on the cable bracket replacement.
1) Helicoil insertion |
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Thu Aug 11 15:24:57 2022, Koji, General, General, OMC #002 Cable bracket replacement (5)
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- The hole size extension is going forwared now.
- Madeline and Chub are cleaning (sonicating) a drill (29/64=0.4531") |
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Mon Aug 15 21:31:56 2022, Koji, General, General, OMC #002 Cable bracket replacement (6)
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The cable bracket was successfully replaced.
Looking from the QPD side (North side in Attachment 1), the connectors for the DCPDs and PZT are sticking out, and the
ones for QPDs are sticking to the other side. So only two rectangular holes (for QPDs) are facing north.
Top left is DCPDT
Top |
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Mon Aug 15 22:06:18 2022, Koji, General, General, OMC #002 new cable tie installed
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[Stephen Koji]
New cable ties were installed on the cable pegs attached to the long sides of the cable bracket.
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Mon Aug 15 22:43:35 2022, Koji, General, General, OMC #002 Delamination repair Part1 (1)
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[Stephen Koji]
Checked the delamination status:
The Invar bar on the cable bracket (DCPD side): Almost all delaminated (Attachment 1 left)
The invar bar on the cable bracket |
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Mon Aug 15 22:49:03 2022, Koji, General, General, OMC #002 Delamination repair Part1 (2) 7x
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EP30-2 preparation
Two Al foil cups + A sheet of Al foil (for test cure)
Set a tube on the glue gun
Attach an applicator tube
Push
a couple of times, and dispense the glue for a single stroke on a waste Al cup
Pour the 6g of glue to the other cup.
Add 0.3g of |