ryan.crouch@LIGO.ORG - posted 19:56, Friday 13 March 2026 (89510)
OPS Friday EVE shift summary
-
TITLE: 03/14 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: I touched up DRMI alignment but we're still having issues with DC centering.
LOG:
| Start Time | System | Name | Location | Lazer_Haz | Task | Time End |
|---|---|---|---|---|---|---|
| 23:24 | Cheta | Sophie | Cheta Lab | local | Workign on Cheta | 00:42 |
| 00:27 | OPS | Oli | LVEA | LOCAL | Unplug laptop charger | 00:33 |
- 01:20 UTC Oli and Jennie report that one of the light bollards in staging upper (the one closest to the stairs) shorted out, gave off a flash of light, a noise and started to lightly smoke. I informed Tyler who took a look using the remote cameras and determined its probably ok for the weekend, but he'll check up on it again.
- While we were locked in DRMI I maximized the power with BS, PRM, and SRM. I was only really to make any gains with PRM_P.
- "WFS DC centering railed" ISC_DRMI, I couldn't get the DC centering loops to turn on and stay on, PM1 was just railing constantly. I found an alog from Elenna with a possibly similar situation alog84782. The codes says its only checking DC1,2,3,4 at this stage and none of those are showing OUTPUTs greater than their LIMITS, only DC6 was showing OUTPUTs > LIMITS and the section of ISC_DRMI wfs_centering for REFL_AS should only check DC1,2,3,4, I'm not sure why its trying for DC6 (PM1?). I tried greatly reducing the gain, even setting it to zero for DC6 to no avail.
- 02:12 UTC I went DOWN and tried to come back up, it went quite quickly, ALS locked quickly on its own ( I reupped the gain on the TRX), IR went great then we locked DRMI within 3 minutes of entering the state ( I didn't raise any of the POPAIR or REFL RF gains) to get stuck by the WFS DC centering railed again. I now tried to reduce all the gains of the DC loops, turning DC6 to 0. After a few minutes ISC_DRMI was able to complete its DRMI_WFS_centering state that it had been stuck in, ISC_LOCK went into up to ENGAGE_ASC but we were constantly saturating RM1 with verbal calling out HTTS
- 02:35 UTC DRMI locked instantly this acquisition (without increasing the LSC gains again), I played with the gains on the DC loops, increasing DC2_Y from -3.5 to -4.0 allowing us to get past the centering, the RM1 HTTS sats started again after we entered ENGAGE_ASC until we lost lock when PRC1 started.
- 02:47 UTC DRMI unlocked, and I put us into IDLE for the weekend
Images attached to this report
