Work Permits Summary, Maintenance Day 2016 August 9
| WP Number | WP Date | Description | alog(s) or comments |
| 6052 | 08/03/16 09:35 PM | Activity: Separately power and move CPS timing distribution boxes. Possible comb source. | End station CPS timing fan outs running on separate power, BSCs re-isolated. Alog 28915 |
| 6053 | 08/04/16 02:38 PM | Activity: Add capacitor from HV stage to LV stage per ECR E1600230. This is to allow PI signals to work in both HV and LV states. This will take each end ESD down for hour or so each. Area of Activity: ETMx Low Voltage ESD driver | |
| 6054 | 08/04/16 04:48 PM | Activity: take ETM images using Pcal camera at EndY | |
| 6055 | 08/04/16 04:58 PM | Activity: Replace 20 in-air metallic mirrors on HWS X and Y table | |
| 6056 | 08/04/16 08:15 PM | Activity: Relocate existing fabric and add new fabric to wind fence at E X. Fabric will be placed 4' above ground level and extend up approximately 16' above ground level. This work will require the use of the LIGO outdoor boom lift. | |
| 6057 | 08/04/16 08:22 PM | Activity: Replace the batteries in the scissor lift that is located in the west bay of the LVEA. | |
| 6058 | 08/04/16 08:24 PM | Activity: Degas PT170 & PT180 Inficon wide range nude ion gauges, one at a time. | Alog 28927 |
| 6059 | 08/05/16 04:54 PM | Activity: After hours and weekend work in the LVEA and VEAs. This permit does not cover activities that would require a work permit during regular hours. A buddy system will be used for risky activities such as operating heavy equipment. Typical work includes investigations of environmental coupling, such as set up of sensors and injection equipment. | |
| 6060 | 08/05/16 05:55 PM | Activity: Bake RGA using manual variacs and heat tapes * RGA isolated from Y-end vacuum volume via closed 2 1/2" metal valve * RGA pumped by turbo which is bolted to the RGA assembly and which is backed by cart-mounted turbo which is then backed by free standing scroll pump * scroll pump and pump cart are strapped together and C-clamped to BSC6's stand weldment * Vent protection provided via an electropneumatic isolation valve mounted between the two turbos which closes upon a programmed pressure threshold or by a loss of power. A second spring/solenoid isolation valve is mounted at the scroll inlet and closes upon a loss of power * All pumps have vent valves removed and vent ports plugged | |
| 6061 | 08/05/16 06:04 PM | Activity: Finish surveying viewports on site to inspect hardware on viewport covers. | Alog 28928 |
| 6062 | 08/06/16 10:34 PM | Activity: Bake RGA using manual variacs and heat tapes * RGA isolated from Y-end vacuum volume via closed 2 1/2" metal valve * RGA pumped by turbo which is bolted to the RGA assembly and which is backed by cart-mounted turbo which is then backed by free standing scroll pump * scroll pump and pump cart are strapped together and C-clamped to BSC6's stand weldment * Vent protection provided via an electropneumatic isolation valve mounted between the two turbos which closes upon a programmed pressure threshold or by a loss of power. A second spring/solenoid isolation valve is mounted at the scroll inlet and closes upon a loss of power * All pumps have vent valves removed and vent ports plugged | |
| 6063 | 08/08/16 04:10 PM | Activity: Replace temporary Coil Driver for ITMX Corn2 with repaired original unit: De-Isolate ISI, swap CD Chassis, repower, reisolate. Duration ~1hr, blend w/ commissioners. |
H1 ITMX ISI Corner2 Coil Driver Original Unit Swapped back in. Alog 28948 |
| 6064 | 08/08/16 04:49 PM | Activity: Replace annulus ion pump on GV3. Ladders only needed. Area of Activity: LVEA VE GV3 AIP R&R | Alog 28965 |
| 6065 | 08/08/16 05:53 PM | Activity: Relocate HAM6 shutter controller from ISCT6 to ISC-R5 to eliminate the long cable run for the shutter trigger. Change R23 from 26.7K ohms to 12.4Kohms in the QPD transimpedance amplifier chassis. This is to increase the maximum threshold for the AS port trigger PD as seen by the shutter controller. See alog https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=28909 | |
| 6066 | 08/09/16 03:44 PM | Activity: This task is to finish the timing upgrade. This includes the Master, Fanouts and any comparitors that might have been missed. This will require a full restart of all Computer and IO chassis. | Alog 28967 |
| 6067 | 08/09/16 03:45 PM | Activity: remove extra binary io card from chassis. Area of Activity: H1SEI 16 adn h1sei23 | done, card installed in psl for ISS 3rd loop work alog 28967 |
| 6068 | 08/09/16 05:40 PM | Activity: (The following work to be performed while leaving the Vertex RGA isolated from the Vertex Vacuum Volume via a closed 2 1/2" metal valve) * Bag RGA assembly * connect and run leak detector (LD) * valve-in LD to RGA volume * Open Cal-Gas isolation valves * evacuate bag (at bottom) with O2 sensors (w/internal pumps) while filling bag (at top) with helium * Restore configuration to as found when complete. Area of Activity: Vacuum, Vertex RGA, LVEA | Alog 28964 |
| 6069 | 08/09/16 09:52 PM | Activity: Copy minute_raw files from h1tw1 SSD RAID to /frames/trend/minute_raw. Once files are copied, remove them from the SSD RAID. This is routine maintenance. Will require a restart of h1nds1 daqd at the start of the copy and again at the end to allow continuous access to the data. Area of Activity: h1tw1, h1nds1, control room. | |
| 6070 | 08/09/16 11:15 PM | Activity: Lead film crew for shoots in LVEA, roof, control room and possibly sites outside (e.g. overpass). Nominally 6am - 6pm, with the early start to avoid commissioning. |