| Work Permit | Date | Description | alog/status |
| 6439.html | 2017-01-17 13:31 | Determine pointing of ITM and CP beams for scattered light investigation. Install viewport guillotine in ITMx and ITMy oplev housings, remove bellows between guillotine and oplev receiver, trace oplev beams. Drive CP and ITMs with offsets to determine which beams are which, compare to D1600385 ray trace map. Requires IFO to NOT be locked. | |
| 6438.html | 2017-01-17 11:15 | Remove h1tw0 channels from EDCU. | 33385 |
| 6437.html | 2017-01-17 07:05 | Remove large accumulation of snow from the roof of the CER. | |
| 6436.html | 2017-01-17 05:06 | Replace power board for the ISS AA chassis. It will mean that the first and second loop power stabilisation will be off-line for a short while as the board is replaced. | |
| 6435.html | 2017-01-13 14:30 | Perform regular every-two-months Calibration Run on PCAL Y following procedure T1500063. Will take 3-4 hours on Teusday Maintenance. | 33392 |
| 6434.html | 2017-01-13 14:25 | Update and restart weather station IOCs to fix unsigned to signed conversion. | |
| 6433.html | 2017-01-13 09:23 | Increase power of SR3 oplev laser to address recent glitching. It is possible this could be a clue/cause for our recent range drop (no SR3 oplev damping, so unlikely, but possible). No viewports will be exposed during this work. Will wait for H1 to lose lock before performing this work. | |
| 6432.html | 2017-01-12 16:50 | Ensure all power cords are pushed firmly into sockets on all computers and switches. Investigate switch sw-ey-aux power alarm. EX, EY, MX and MY. | |
| 6431.html | 2017-01-12 09:16 | Update and restart the Beckhoff PLC code on h0vacmr and h0vacex to reflect the change to Gamma controllers for IP5 and IP12. Update MEDM screens. Requires DAQ restart for change of channel names. Will trip off HV at end X. | 33385 |
| 6430.html | 2017-01-11 12:56 | Troubleshoot ion pump at Y2-8, 250 meter cable will be tested, trying to find a short, controller will be powered cycled several times during test. Controller is located inside the vacuum support equipment room @ Y-End station. | 33388 |
| 6429.html | 2017-01-11 07:39 | Clear snow from Y arm and X arm. | 33147, 33148 |
| Previous W.P. | |||
| 6423.html | 2017-01-09 15:00 | Install PEM STS on to Modified BRS Y Mounting Plate to explore for better coherence and/or subtraction of tilt at EY. Installation on Tue during maintenance. STS will remain there for the foreseeable future. No new digital infrastructure should be needed. For details, see SEI aLOG 1090. | 33128 & 33387 |
| 6415.html | 2017-01-03 08:03 | Install HVAC Controls Upgrade. This will involve accessing VAV boxes and pulling new thermostat wire in the OSB. Out building work will be scheduled on a "as we can get access to them" basis. | 33385 |