Evan, Elli

A 1611 photodiode has been added to ISCT1 in preparation for a schnupp asymmetry measurment. 

The new 1611 photodiode sits between the Refl Air A and Refl Air B photodiodes (see table layout D1201103).  An AR optic is placed before Refl Air B as a pickoff to divert a small amount of power to the 1611PD.  29mW of power was going toward Refl Air B, of which 0.4mW of power is now diverted to the 1611PD.  The beam is slightly larger that the PD area- we could focus the beam to get more power if needed.

The PD is powered by a +/-15V power supply which we placed on top of ISCT1. The cables for the PD are coming out through a patch panel on the left hand side of the table.  Evan has made a longer power cable in order to reach the power supply.

Tomorrow we plan to lock PRMI to the sideband and take a preliminary set of measurements for the schnupp asymetry.

Looks like h1conlog3 (the web server and replica) suffered a hardware failure on its disk yesterday afternoon at 15:00 PST, Saturday 27 December 2014. I have rebooted this machine, but it still only reports changes to 15:00 12/27 and the hourly reports are failing. We are investigating.

model restarts logged for Sat 27/Dec/2014
2014_12_27 06:27 h1fw1
2014_12_27 12:47 h1fw0

both unexpected restarts. Conlog reporting was offline yesterday.

I have just noticed that the corner station Hartmann Wavefront Sensor EPICS IOC server (h1hwsmsr) is not responding. It failed between 8pm and 9pm Wednesday night (12/24). If anyone needs the HWS for commissioning over the next week, please call me on my cell phone and we can try rebooting.

no restarts reported. Conlog frequently changing channels report attached.

model restarts logged for Wed 24/Dec/2014
2014_12_24 11:21 h1ioplsc0
2014_12_24 11:23 h1lscaux
2014_12_24 11:23 h1lsc
2014_12_24 11:23 h1omc
2014_12_24 11:25 h1iopiscey
2014_12_24 11:27 h1caley
2014_12_24 11:27 h1iscey
2014_12_24 11:27 h1pemey
2014_12_24 11:29 h1odcy

Recovery of LSC and ISC-EY from power glitch

model restarts logged for Thu 25/Dec/2014
2014_12_25 19:27 h1fw1

one unexpected restart over the two days. Conlog frequently changing channels list attached

Yend pumpdown.

Moving the right way now.

Tested the new off-loading feature for the integrator. The attached plot shows two changes in the bias value: the first near 4.5 sec is with the offload button off, the second transition near 8.4 sec is with the offload button on. In both cases the change is reflected on the integrator output value (OUT channel). In the first case, the bias change introduces a transient in the output drive (DRIVE). In the second case, no transient is observed and the integrator value is off-loaded into the bias value smoothly and instantaneously.

Had to restart the EY laser.

Looking at the EY SUS alignment it seems to have more or less recovered from the vent. The green return beam still hits the WFS, even so it somewhat high. Using bias sliders of 93.4/-50 for pitch and yaw for ETMY (75.6/-60.5 old) and 144.2/5.8 (no change) for TMSY steers the beam back onto the center of WFS_A.

The EX SUS alignment did not recover. I did not find the return beam. I only searched around the nominal good alignment, so. Trying to steer back by looking at the plots of SUS bias and oplev positions doesn't help. The EX VEA decided to increase its ambient temperature by 1°C.

Probably from the power glitch, the DAQ EPICS shows garbage data for iscey. EPICS readbacks are fine.

Most DTS systems were glitched by last night's power event. x1fe3, x1seibsc and x1susaux are currently offline. I restarted all the models on the running front ends, and the DAQ. I'll leave the complete recovery until we return to the site after the holidays.

Daniel, Stefan, Dave

To clear the IOP DAC error bit in the state words for h1lsc0 and h1iscey, I restarted all the models on these two front ends remotely. Procedure was: stop all user models; restart iop model; start user models. On each startup, I manually set the BURT_RESTORE channel to 1 after about 3 seconds of running. Finally I pressed DIAG_RESET on all models to clear the IPC errors raised by the restarts.

The LHO GC UPS reports going onto battery power from 19:56:21 to 19:56:26 PST Tuesday 23rd December 2014. This is the time Jeff reports the PSL developed problems. 

Looking at the CDS overview this morning (attached) several systems are reporting problems. I press the DIAG_RESET button on all models and got the second MEDM screen attached.

Looks like we are having DAC errors on LSC and ISCEY. We will most probably have to restart all the models on these front ends to clear. If any commissioners are on site today, could you call my cell phone and we can walk through this.

model restarts logged for Tue 23/Dec/2014
2014_12_23 10:29 h1iscex
2014_12_23 11:43 h1iscex
2014_12_23 11:44 h1iscey
2014_12_23 11:47 h1broadcast0
2014_12_23 11:47 h1dc0
2014_12_23 11:47 h1fw0
2014_12_23 11:47 h1fw1
2014_12_23 11:47 h1nds0
2014_12_23 11:47 h1nds1
2014_12_23 12:15 h1iopsusquadtst
2014_12_23 12:15 h1susquadtst
2014_12_23 14:39 h1iscex
2014_12_23 14:39 h1iscey
2014_12_23 14:44 h1broadcast0
2014_12_23 14:44 h1dc0
2014_12_23 14:44 h1fw0
2014_12_23 14:44 h1fw1
2014_12_23 14:44 h1nds0
2014_12_23 14:44 h1nds1

no unexpected restarts. Maintenance day builds of ISC EX,EY with corresponding DAQ restarts. Restart of susquadtst following DAQ problems when powering it down. Beckhoff restarts shown in attachment.

Conlog frequently changing channels report attached.

At John's suggestion, I checked the turbo bypass valve and found that it was still open (from rough pumping phase) -> Closed bypass valve -> OK

This is the first time that I have overlooked this in the "many" times that I have performed this procedure (there's a first time for everything!).  This proved (to me) to be a surprising explanation of the symptom since the bypass circuit is ~2' of 1.5" tubing (+ two 90s) connecting the turbo exhaust to the turbo inlet.  As such, I would have never guessed that a compression ration of ~500 could have been maintained with such a large conductance between exhaust-intake (who knew!) 

Also, isolated pump carts from BSC9 and BSC10 annulus volumes -> Both systems pumped only by ion pumps

~0635 - 0650 hrs. local -> In and Out of X-end VEA 

~0700 - 0710 hrs. local -> In and Out of Y-end VEA

J. Kissel

Just after the commissioning vanguard left for the evening (2014-12-24 03:57 UTC, Dec 23 2014 19:57:00 PST, 1103428636) the PMC / FSS went down, and it's been flashing and struggling to recover since. I attach a few relevant screen shots. Wish I could diagnose / fix...

Merry Christmas to all, and to all a good night!