I reset all the watch dogs on the ITM HPI and ISI. ITM ISI is in damping state. Didn't press the isolate stage command.

I try to lock the arm (remotely), but it seems that H2:ALS-Y_FIBR_SERVO_FASTMON (e.g. the CMB-A fast output, which is the fiber locking feedback signal to the laser PZT) is railed at -10V. The beatnote frequency readout is at 60 MHz, but not sure if that is real or not. Should go out to EY to make sure all is well. (PS. to engage the fiber locking open the 'Laser' screen and press 'on' at the lower left).

I turned off the FIBR servo (CMB-A), to make sure the temperature doesn't walk away.

The OAT RefCav monitor signal seems to be ok (~0.1 mW).

Turned off ETMy ring heater

[David T, Cheryl V and Deepak K]

• Most of the parts required for assembling the FI has been hunted down.
• The Granite Block for the FI is kept on the H1 PSL Table.
• Almost all the parts that have been located are kept in the H2 PSL Enclosure.
• The Tools are also stored at the same place.
• The Hardware for the FI is in the C&B load.
• The H1 FI Spacer, H1 FR Heat Sink(?) and the H1 RWHP height adapter are also in the Clean and Bake.
• The Siskiyou mounts are also stored in the H2 PSL enclosure.
• The alignment optics are also in the H2 PSL Enclosure.
• A cart with a optical table is also stored in the Enclosure for transporting the Faraday Isolator.
• An Aluminum Box is being designed to cover the FI during transportation and can be locally made onsite @LHO.

[David T, Cheryl V and Deepak K]

• The Siskiyou mounts for the 2 inch Optics (2 AROM RH, 2 ROM RH, 1 ROM LH and 1 Spare ROM RH) where assembled and stored in the HAM 3 Chamberside IO Racks.
• The pico Motors for the AROMs are assembled with the mounts.
• The 2" optics themselves were selected and stored on the racks alongside the Siskiyou mounts.
• The 3" optic is also stored with the 2" ones.
• All the posts and the Forks are also stored on the rack.
• The Spare Optics are in the H2 PSL Enclosure along with the HAM2 Optics.

The backup of h1boot and h2boot still slows the EPICS associated with the front end systems. Even though I only backup at 5am daily, the slow down is still evident at that time. Until the root cause of this problem can be resolved, Jim and I came up with a totally inelegant solution of slowing down the data rate of the network switch ports which connect h1boot and h2boot to the backup machine. These ports were demoted from 1GB to 100MB. We tested both h1boot and h2boot backups. They take about an hour each (compared with 20mins previously). The disk I/O rate keeps below 5MB per 5 second average. The EPICS problems were previously observed to occur when the disk I/O exceeds 8MB per 5 second average.

A large percentage of the backups concern the awgtpman log files which can be many 100MB each. We will work next Tues on installing new awgtpman code to reduce the logging content of these files.

The arm cavity is unlocked right now due to issues with the HEPI on ITMY.

I have installed the IOP SUS watchdog system for the H1 HAM2,3 systems. The sus systems are h1sush2a and h1sush34, the seismic system is h1seih23. Following the LLO system, the suspension systems being monitored are

HAM2: PR3

HAM3: PR2 and MC2

If any of these sus system trip, the DACs on h1seih23 (HEPI and ISI in HAMS 2,3) are tripped via the Dolphin IPC.

Currently SEI HAM2,3 is permanently tripped due to missing PR3 OSEMS. I will reconfigure the system into a working state when the ISI are unlocked in HAM2/3.

The H1 IOP watchdog MEDM is available from the H1 SITEMAP

I turned on the ETMY ring heater around 23:47 UTC, requesting 630mA in each segment. I'm going to leave it running overnight and into the weekend to get a good measurement of the thermal time constants.

After finishing assessing and adjusting the roll and pitch of the suspensed PR2 optic, we started adjusting the 14 OSEM positions.  During the coarse of this, we broke a magnet off of the PR2 optic.  Mark Barton and Travis are looking into regluing it onto the optic within the suspension, in an effort to retain some sort of schedule for next week while our team is stretched over to LLO.  Lesson learned is that the EQ stops need to be set very close while adjustments are being made.  I thought this was the case when we were working on it, but clearly not close enough.  It's unfortunate that the top BOSEM adjustment tools and your hand are very close to the suspension wire making knocking the suspended masses around easy.

Mitchell, Jim & Hugh
The first layer of the additional payload mass (D0901075) on the West side of HAM (90kg) has been bolted down to the table; we did this Thursday.  There is still 210kg to go.

Remain to Do:
At ISI: Complete Cable SN Inventory, Replace Act Windows, Confirm Cable security for flight.

At HAM5: Loosen Door Bolts, Clean around Doors, Remove Doors, Remove Top Conflat, Remove Legs from A-Frames, Position A-Frames at Chamber, Install I-Beams, Position I-Beams per Procedure, Position Cart under Beams, Fly ISI, etc...

Thanks to Christina, Karen, Cris, MarkD, ScottL, DevilEd, Jim, Mitchell, Greg, & Eric

Prior to venting, I sprayed helium around the welds which join the thin-wall MC tube to the thick flanges.  The LD background was 3.5 x 10-9 torr*L/sec -> no responses.  I did not spray all of the welds on the MC nozzles, roll seams or roll butt joints, however.  

Also, PT120A wasn't working today.  I think that I had drug my fall protection tether across the gauge pair the other day during leak testing and must have interrupted the cable connection.  I eventually had to remove and re-installed its cable to get it going which fixed it.  

Cheryl moving TCS lasers into HAM 6 bay
Kyle soft closed GV-5, venting vertex for ISI install into HAM5

Restarted models on the sei test stand (stormy), cpu for the iop was pegged.

The H2 ITMY and ETMY have been re-centered with the cavity beam locked at approximately 10:05 for ITMY and 10:55 for ETMY.  The cavity was locked at the time.

One particular note, all of the electronics for the ETMY optical levers (laser, whitening chassis, power supply) were running off a power strip that was disconnected sometime in the past few days and this caused a loss in signal.  Please don't do this.

Morning (8-noon) Notes

OAT Work:  Aiden & crew had the reins for Ring Heater work

Craning activity:  HAM5 ISI had it's Container top removed and the ISI is staged in a cleanroom

H2 ITM/BS CPU Meter went to a MINOR alarm state (value = 13) at 8:27am

Thomas centering oplevs for ITMy & ETMy

Mark Dodson making measurements around BSC8 10-10:15

Kyle is inquiring about venting section of HAM5.

Patrick is covering the afternoon.

I turned on the Ring Heater this morning to a nominal 30W of electrical power. We've yet to fully determine the ratio of the radiated power to electrical power, but the most recent number is approximately 2.5W radiated power per 6W electrical power.

I measured the spherical power of the HWS beam -  probing the ETM thermal lens and surface deformation and compared it to the results from a simple COMSOL model of the predicted thermal lens + surface deformation [no fitting]. The results are shown in the attached plot. Bear in mind that the scale of the predicted model will be affected by the delivered power (dependent on the radiated to electrical power ratio) and that the HWS is still operating on a nominal calibration for the optical system - rather than a measured calibration. 

The results are quite similar but there are obvious differences in the time constant. At the moment I would put that down to the simplicity of the COMSOL model - it doesn't include the flats on the sides of the ETM, or the reaction mass or the time constant associated with the ring heater itself.

However, this is the first real aLIGO measurement of thermal lensing with the HWS.

Caution: this is not solely the surface curvature of the ETM - the optical path distortion from the thermal lens is roughly 10x larger than that of the surface curvature.

10-Aug-2012 11:34AM - replaced plot. I had added the incorrect sign to the surface deformation in the model. I've fixed this.

Thomas tried to add a python script (with extension .py) to his LHO aLOG 3758, but was thwarted and needed to change the extension to .txt in order upload it. Please add this to the acceptable files.