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Full | Summary | Threaded     -- All entries -- Last day Last 3 Days Last week Last month Last 3 Months Last 6 Months Last Year -- Type -- General Facility Clean Supply Mechanics Optics Electronics  544 Entries

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ID Date Author Type Category Subject Text   402   Sat Nov 21 13:58:30 2020 Koji Electronics Characterization Dark Current Measurement for InGaAs QPDs Dark current measurement for InGaAs QPDs (OSI FCI-InGaAs-Q3000) has been done using Keithley 2450 and Frank's diode test      403   Sun Nov 22 13:49:12 2020 Koji Electronics Characterization Impedance Measurement for InGaAs QPDs To know any anomaly to the junction capacitance of the QPD segments, the RF impedances were tested with a hand-made impedance measurement.      404   Mon Nov 23 23:17:19 2020 Koji Electronics Characterization The dark noise of the Q3000 QPDs The dark noise levels of the four Q3000 QPDs were measured with FEMTO DLPCA200 low noise transimpedance amp.      405   Tue Nov 24 10:45:07 2020 gautam Electronics Characterization The dark noise of the Q3000 QPDs I see that these measurements are done out to 100 kHz - I guess there is no reason to suspect anything at 55 MHz which is where      406   Tue Nov 24 12:27:18 2020 Koji Electronics Characterization The dark noise of the Q3000 QPDs 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      407   Fri Feb 5 07:40:37 2021 Stephen Supply General OMC Unit 4 Build Machined Parts OMC Unit 4 Build Machined Parts are currently located in Stephen's office. See image of large blue box from office, below.      408   Thu May 20 17:03:50 2021 Koji General General SRS LCR meter SRS720 borrowed from Downs Item loan: SRS LCR meter SRS720 borrowed from Downs. The unit is at the 40m right now for testing with an excelitas PD. Once      409   Sun May 30 15:17:16 2021 Koji General General DCPD AF capacitance measirement Attachment 1: System diagram. The reverse bias voltage is controlled by DS335. This can produce a voltage offset      410   Sun May 30 15:32:56 2021 Koji General General DCPD AF capacitance measirement Measurement result: The capacitance at no bias was 460~500pF. This goes down to below 300pF      411   Wed Jul 7 14:21:50 2021 Stephen Supply General OMC Unit 4 Build Machined Parts More explicit insights into the inventory for the Unit 4 build. Image of inventory included below.      412   Thu Jun 23 21:03:33 2022 Koji Facility General Moving the small optical table to CAML (TCS Lab) 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      413   Tue Jun 28 16:13:34 2022 Koji General General The small optical table not small enough to get out 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      414   Fri Jul 15 22:14:14 2022 Koji General General OMC Lab recovery for the OMC #002 test - The lab is chilly (18degC) - Cleaned the lab and the optical table a bit so that the delicate work can      415   Mon Jul 18 14:20:09 2022 Koji General General OMC #002 Plan Portal == Initial Preparation == [Done] OMC #002      416   Tue Jul 19 03:17:56 2022 Koji General General OMC #002 Power Budget before mirror cleaning o Power Budget (2022/07/18) NPRO ADJ -50 (min) Fiber incident 62.8mW      417   Thu Jul 21 02:55:06 2022 Koji General General OMC #002 Power Budget after mirror cleaning o Power Budget after FirstContact cleaning (2022/07/20) NPRO ADJ -50 (min)      418   Thu Jul 21 13:21:27 2022 Koji General Configuration Windows laptop for WincamD Beam'R2 recovery The Windows laptop for WincamD/Beam'R2 (DELL Vostro3300) was not functional.  - Windows 7 got stuck in the starting      419   Thu Jul 21 14:35:35 2022 Koji General General Bond reinforcement blocks for the invar brackets Bond reinforcement blocks for the invar brackets: Attachment 1:      420   Thu Jul 21 14:55:48 2022 Koji General General Optics bonding for the backscatter measurement The backscatter beam is supposed to appear in the backpropagation path. The transmission of the OMC has a couple of optics, it's      421   Thu Jul 21 17:47:00 2022 Koji General General The profile of the beam incident on the fiber input coupler The profile of the beam incident on the fiber input The fiber input was deflected by      422   Fri Jul 22 00:31:17 2022 Koji General General OMC #002 backscatter measurement Measure the power ratio between the forward-propagating and reverse-propagating beams. Place a small deflecting      423   Fri Jul 22 17:41:01 2022 Koji General General SRS LCR meter SRS720 returned to Downs SRS LCR meter SRS720 was returned to Downs as before.        424   Fri Jul 22 17:47:38 2022 Koji General General C&B request for the reinforcement blocks OMC Reinforcement blocks 1. P/N D1600316; Version v4; Type 01; Qty 30; Source Chemistry Machine Shop      425   Mon Jul 25 18:25:04 2022 Koji General General A/C Filter was replaced New filter PN Grainger TK70457312T Mini-Pleat Air Filter,      426   Tue Jul 26 00:01:59 2022 Koji General General OMC #002 delamination check 2 More epoxy delamination check: DCPD R (Attachment 1): Found half delaminated      427   Tue Jul 26 00:12:58 2022 Koji General General High QE PD: QE measurements - Installed the High QE PDs to OMC #002 B1-22@Cage B1 was installed to the transmission DCPD B1-23@Cage      428   Wed Jul 27 10:09:51 2022 Koji General General 4+4 wire clamp in hand Regarding: D1200971 - 4 CLASS A wire clamp obtained      429   Wed Jul 27 10:34:09 2022 Koji General General High QE PD: QE measurements 2 - DLPCA-200 trans-impedance amplifier was calibrated.   Keithley source meter 2450      430   Wed Jul 27 10:34:30 2022 Koji General General OMC #002 Protective FirstContact Paint The optical surfaces were coated with FirstContact to keep them clean / somewhat protected during the transportation.      431   Wed Jul 27 23:52:18 2022 Koji General General OMC #002 Cable bracket replacement (1) Parts check - D1300052-V3 SN001 is going to      432   Thu Jul 28 00:28:15 2022 Koji General General OMC #002 Cable bracket replacement (2) Connector unmounting - (Attachment 1)      433   Thu Jul 28 00:46:47 2022 Koji General General Subject: OMC #002 Cable bracket replacement (3) Checking the spare parts  - Conclusion for OMC#2: need PEEK cable      434   Wed Aug 10 18:42:27 2022 Koji General General OMC #002 Cable bracket replacement (4) [Stephen Koji] Now we got the C&Bed parts to continue to work on the cable bracket      435   Thu Aug 11 15:24:57 2022 Koji General General OMC #002 Cable bracket replacement (5) - The hole size extension is going forwared now.      436   Mon Aug 15 21:31:56 2022 Koji General General OMC #002 Cable bracket replacement (6) The cable bracket was successfully replaced. Looking from the QPD side      437   Mon Aug 15 22:06:18 2022 Koji General General OMC #002 new cable tie installed [Stephen Koji] New cable ties were installed on the cable pegs attached to the long sides      438   Mon Aug 15 22:43:35 2022 Koji General General OMC #002 Delamination repair Part1 (1) [Stephen Koji] Checked the delamination status:      439   Mon Aug 15 22:49:03 2022 Koji General General OMC #002 Delamination repair Part1 (2) EP30-2 preparation Two Al foil cups + A sheet  7x    440   Wed Aug 24 02:51:23 2022 Koji General General OMC #002 Delamination repair Part1 (3) Inspection of the bonding on the suspension interface side. All look good.  8x    441   Wed Aug 24 02:53:46 2022 Koji General General OMC #002 Delamination repair Part2 (1) Inspection of the delaminations in the optics side      442   Wed Aug 24 02:57:43 2022 Koji General General EP30-2 bonding setup EP30-2 bonding setup      443   Wed Aug 24 03:20:59 2022 Koji General General OMC #002 Delamination repair Part2 (2) Bonding  11x    444   Wed Aug 24 03:26:43 2022 Koji General General OMC #002 Delamination repair Part2 (3) Inspection    8x    445   Wed Aug 24 11:29:47 2022 Koji General General OMC #002 ready for shipment [Stephen Koji] The OMC #002 is ready for shipment.      446   Thu Aug 25 14:22:08 2022 Koji General General LLO OMC #001 Ballast Mass investigation Inspected the past LLO add-on mass configuration. There are unknown masses at the DCPD side. It looks like a small SS mass      447   Thu Aug 25 20:05:00 2022 Koji General General LLO OMC #001 Ballast Mass investigation Here is the balance mass info for the LLO OMC#001 analyzed from the photographs Added masses are: 50+10g,      448   Fri Aug 26 22:29:02 2022 Koji General General Tool Shipping Prep Shipping preparation for the LLO trip Started July 15, 2022 and finished Aug 30. So it      449   Tue Sep 20 08:54:33 2022 Koji General General PD cage arrangement Upon the LLO work, the current PD arrangement in the cages are: CAGE B      450   Mon Sep 26 14:27:49 2022 Koji General General LLO OMC ICS work OMC #001 ICS Link: https://ics.ligo-la.caltech.edu/JIRA/browse/ASSY-D1201439-1 Already      451   Mon Nov 7 21:16:16 2022 Camille Optics Configuration Setting up the fiber couplers [Camille, Koji] Began setting up fiber assembly for OMC testing:

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