| Work Permit | Date | Description | alog/status |
| 6573.html | 04/11/17 01:37 PM | Move the high frequency lines to 5501.3 Hz and 6001.3 Hz | 35479 |
| 6572.html | 04/11/17 12:41 PM | Install SRC detuning time dependent tracking. Includes update to CAL-CS front-end model, GDS gst-lal calibration pipeline code, updates to the science frame channel list which need to be included in all down stream channel lists so that the GDS pipeline can use those channels. Requires DAQ restart, and modification to separate DMT Frame Broadcaster channel list. Corresponds to gstlal release 1.1.5. | 35462, 35474, 35478 |
| 6571.html | 04/11/17 10:16 AM | Duplicate of WP 6570 | |
| 6570.html | 04/11/17 10:16 AM | Add back in two PEM general ADC channels to the DAQ frame. Both will be 4kHz. DAQ restart required. | |
| 6569.html | 04/10/17 04:44 PM | Unlock MC to reduce ifo. light at End Stations, block OptLev beam, switch off ALS beam, energize illuminator, capture ETM photos for Pcal beam localization investigations. | |
| 6568.html | 04/10/17 02:35 PM | Reduce the cell phone texter alarm level for all LN2 Dewars from 20% to 15%. FRS7835 | |
| 6567.html | 04/10/17 01:39 PM | 1. Update DMT calibration code to gstlal-calibration-1.1.5-v1: i. Bug fix for time immediately before and after data dropouts. CALIB_STATE_VECTOR now marks this time as bad. For a description of the problem, see https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=32486 ii. New algorithm to compute SRC detuning parameters. These are written to the channels GDS-CALIB_F_S and GDS-CALIB_SRC_Q_INVERSE, but no corrections to them are applied to h(t). The calibration group wishes to further develop this so that corrections are applied to h(t), perhaps for O3. (Will turn this on only when new filters are ready.) iii. Addition of option --cancel-callines to remove calibration lines. This is a command line option, meaning we may choose not to use it yet. If used, GDS-CALIB_STRAIN is unaffected. Rather, an additional channel, GDS-CALIB_STRAIN_CLEAN, is written out, which has the calibration lines removed. 2. Run "yum update" to install all patches and updates on all 3 DMT boxes, h1dmt0, 1, and reboot. This is to install updated ROOT library packages and get latest OS patches to bring DMT boxes up-to-date. | 35471, 35472, 35478 |
| 6566.html | 04/10/17 10:31 AM | Spin up turbo pump attached to OMC vacuum tube in LVEA; run Kobelco dry purge air compressor system and QDP80 rouging pumps in mech. room. The purpose of this task it to test equipment needed for vertex vent. | 35465 |
| 6565.html | 04/10/17 09:57 AM | Swap the ITMy oplev laser for a new one. K. Venkateswara noted in LHO alog 35341 that the ITMy oplev had a feature at ~0.44Hz that appeared immediately after the March 7th laser swap and seemed to be causing range drop issues with H1. It is hoped a new laser will remove this feature. No viewports will be exposed during this work. | 35470 |
| 6564.html | 04/07/17 10:09 AM | Return ETMX PCIe card to ETMX HWS computer. | 35469 |
| 6563.html | 04/06/17 09:42 AM | Measure L2A TFs for MC2, Install L2A filters. | 35464 |
| 6562.html | 04/06/17 09:07 AM | Determine the left-right relation in the Hartman wave front sensor (HWS) image by intentionally tilting the ITMX mirror by several micro radians. This measurement will not let the interferometer stay locked. | 35364 |
| 6561.html | 04/06/17 08:23 AM | Regular bi-weekly calibration sweeps. Will be done during commissioning period between 9a - 1p. | 35361 |
| Previous W.P. | |||
| 6541.html | 03/27/17 08:40 AM | Perform scheduled maintenance to scroll compressors at Y-MID vent/purge-air supply skid. Maintenance activity will require for the compressors to run for brief periods of time to check compression. Lock-out/tag-out power to skid as required. | 35149, 35480 |