peter.king@LIGO.ORG - posted 05:18, Monday 29 January 2018 - last comment - 10:19, Monday 29 January 2018(40305)
Laser trip
Came in this morning to find the oscillator off. The front end was still running. Looks like the watchdog kicked in
some ime around 5:30 pm Saturday.
The power decay from head 1 is the reason for the decay in laser output power. I upped the current of the 3 other
diode boxes by 0.5 A.
Laser restarted without any major hiccups. Other stuff came on-line pretty quickly. Witnessed a couple of
occasions where the injection locking was lost.
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In an attempt to stabilize HPO DB1, I adjusted the operating temperatures of the 7 individual pump diodes in DB1. The changes are summarized below:
| Operating Temperature (°C) | ||
| Old | New | |
| D1 | 24.0 | 24.5 |
| D2 | 24.0 | 24.5 |
| D3 | 22.5 | 21.5 |
| D4 | 24.0 | 23.5 |
| D5 | 24.0 | 23.0 |
| D6 | 24.0 | 24.5 |
| D7 | 24.0 | 24.5 |
This took the output power of the HPO from 138.9 W to 140.4 W, an increase of 1.5 W simply from temperature tweaks. We will continue to monitor.