This morning I changed the configuration of the EPICS gateway processes that serve the vacuum subnet IOC PVs to limit the allowed PVs to those actually available from the vacuum IOCs.  This is to eliminate the additional broadcast traffic that occurs when the gateway searches for PVs that do not exist in this subnet (and it does this a lot, each time a client broadcasts for a non-vacuum channel).  Searches are now limited to channels starting with "HVE-" or "H0:FMC-" (this last should probably be constrained further, but this is a good start).  Attached is a plot of the reduction in broadcast traffic as a result; the 'mini-peaks' that still occur near the start of the hour are probably from the hourly burt backup for H0:FMC channels not in the vacuum subnet.

J. Kissel, A. Pele

Given the confusion of installation status vs what guardians are running what and why, I've brought all corner station guardians down to their equivalent SAFE or OFFLINE or UNLOCKED or DOWN state, and then paused them. These should not be unpaused again until we close up a given chamber and the install is complete. 

ETMX and EMTY should still be maintained under guardian control, and operators should make sure that they are fully isolated / aligned at all times until further notice.

The latest results from the X1 QUAD08 tfs -after Joe Odel/Jeff B/Andres R reworked on the quad to replace the top mass blades and rebalance the masses- are attached below and compared with the previous measurements from last week. This work was initiated to resolve the 10% discrepancy seen between the measured and modeled 2nd pitch mode frequency (1.32Hz) cf 5th page of 1st attachment. Though, the comparison shows this mode has stayed unchanged, except for a new pitch to vertical coupling at 2.25Hz.

PeterK, MattH, ChrisM, RickS

This morning, Peter found that the Crystal Chiller would not restart (apparently the laser has been down since last Friday).

He went to the Laser Area Enclosure and found a puddle on the floor near the High Power Oscillator.

Removing the HPO covers revealed that a small (~3/16" ID) hose had separated and was leaking.

Hose was replaced, water mopped up, chiller restarted, water level topped off.

More details and photos to follow.

model restarts logged for Mon 30/Jun/2014
2014_06_30 10:45 h1iopsush2a
2014_06_30 10:46 h1suspr3
2014_06_30 10:46 h1susprm
2014_06_30 10:48 h1susmc1
2014_06_30 10:48 h1susmc3
2014_06_30 10:49 h1iopsush34
2014_06_30 10:50 h1suspr2
2014_06_30 10:50 h1sussr2
2014_06_30 10:52 h1iopsush56
2014_06_30 10:52 h1susmc2
2014_06_30 10:54 h1susomc
2014_06_30 10:54 h1sussr3
2014_06_30 10:54 h1sussrm
2014_06_30 10:56 h1hpiham1
2014_06_30 10:56 h1hpiham6
2014_06_30 10:56 h1iopseih16
2014_06_30 10:56 h1isiham6
2014_06_30 10:58 h1iopseih23
2014_06_30 10:59 h1isiham2
2014_06_30 10:59 h1isiham3
2014_06_30 11:01 h1hpiham2
2014_06_30 11:01 h1hpiham3
2014_06_30 11:02 h1iopseih45
2014_06_30 11:04 h1hpiham5
2014_06_30 11:04 h1isiham4
2014_06_30 11:04 h1isiham5
2014_06_30 11:06 h1hpiham4

no unexpected restarts. Install of SWWD on HAMs

Jeff, Patrick, Dave.

I installed the latest IOP SWWD models on the following systems: h1iopsusb123, h1iopseib1, h1iopseib2, h1iopseib3. All SUS and SEI models on these front ends were stopped (using guardian to first put them into a safe state) and then restarted.

This completes the SWWD FE install, I am now cleaning up the MEDM screens.

In the corner of the "cleaning area" adjacent to the door to the LVEA there is now a fully stocked Contamination Control (CC) Area and 3x fully stocked Contamination Control Portable Kits.

These are available for all to use. In fact if you have an open chamber there is no reason you shouldn't have a Contamination Control Portable Kits. How do I know what a Contamination Control Portable Kits looks like? Don't worry they are the BIG PINK Really Useful boxes, and as such pretty noticeable. See attached pdf  for picutres of the portable kits and the main CC area.

Further details can be found here LIGO-T1400310: Contamination Control Kits - Parts list, poster and kiting plan and use. At this DCC link you will find slides descirbing the area, a poster of all of the items included in the kits, a correspoding parts list, labels and a chamber entrance guide.

Please see Jeff Bartlett if you have any questions and liaise with Jeff for re-stocking of the portable kits and areas.

Calum Torrie

Last week at LHO (Travis, Betsy, Kate and Calum) tested the TM Green Lantern, LIGO-D1400060-v4, on the ITM in the WBSC3 chamber. The Test Mass (TM) Green Lantern gives a system which allows us to: -

i) Illuminate the optic (in chamber) in a consistent manner at grazing angle to face of optic. (The TM Green Lantern can be installed while first contact (FC) in place. In addition the FC can be removed while TM Green Lantern is in place.)

ii) Highlight dust on the surface of the optic cf. previous methods of illumination (flashlight) which couldn't operate at grazing angle. As such the previous methods illuminatated substrate defects instead of dust on the surface.

iii) Image the dust on the optic (as a result of the effective illumination).

iv) See (and image) the effectiveness of the FC on a dusty optic. (This has not yet been tested.)

The TM Green Lantern is now on site at LHO (class B) under Betsy's ownership. See attached image below.

Calum Torrie (and team listed above).

After this mornings boots (just happened, see more from Dave I suspect shortly), I see that the guardians for all of the SUSes come back in EXEC mode.  THey were previously set to PAUSE or other state.  Why does it reset to EXEC after boots?

Since we got the "All Clear" from SUS this morning on ITMx suspension health, the following are the final alignment numbers for the ITMx and CPx.  For ACB final alignment numbers see alog 12542.

• X Axis Position: 5012.6 mm
  • Target: 5012.9 mm
  • Error: -0.3 mm
  • Tolerance: ±3.0 mm
• Y Axis Position: -199.8 mm
  • Target: -200.0 mm
  • Error: +0.2 mm
  • Tolerance: ±1.0 mm
• Z Axis Position: -83.1 mm
  • Target: -83.1 mm
  • Error: 0.0 mm
  • Tolerance: ±1.0 mm
• Pitch: 574 µrad down
  • Target: 619 µrad down
  • Error: 45 µrad up
  • Tolerance: ±50 µrad
• Yaw: 17 µrad CW
  • Target: 0 µrad
  • Error: 17 µrad CW
  • Tolerance: ±50 µrad

CPx

• Pitch: 2.043 mrad down
  • Target: 1.945 mrad down
  • Error: 98 µrad down
  • Tolerance: ±1.4 mrad
• Yaw: 533 µrad CW
  • Target: 0 µrad
  • Error: 533 µrad CW
  • Tolerance: ±1.4 mrad

reset ITMX and ETMY
BS and ETMX IPS are close to trip levels, did not reset

ITMX suspension is healthy, ready for handoff
TCS installing computer at end X, connecting to camera, running ring heater to test the Hartmann sensor
Richard: cabling at end stations

This brought the level to just about the max.

In cleanroom start of 4pm session:

All counts zero

In chamber start of 4pm session

0.5um...20 counts

remainder....zero counts

In chamber end of session:

0.5um...30 counts

remainder...zero counts

J. Kissel, A. Pele, T. Sadecki, B. Weaver,

After another day's worth of fumbling and hand-waving, we've finally traced the discrepant transfer function magnitude to a loose cable connection at the air-side of the feedthrough. In the course of attempted fixes, we measured a few more things, moved a few more things, replaced the R0 F2 and F3 OSEMs, but the only thing that fixed it was the cable connection. This flaw with the electronics chain should have been found earlier with our cable swap on Friday, with remeasuring the open light current, and with Arnaud's DC actuation test below, but frustratingly, it did not. But we found it. 

I'm in the process of getting formal transfer function measurements now, but I'm confident from what I'm seeing thus far that this SUS is read for close-out. Will post comparison TFs once they're finished.
We have exORSIIIIIIIZED the demons. This SUS is clee-uh.

Details (In rough chronological order)
-------
- Arnaud compared the ETMY and ITMX R0 F2 to F2 and F3 to F3 drive at DC using the alignment offsets (the only QUADs available, so take ERM and TCP chain comparison with a grain of salt), and concluded that the chains are driving with comparable and within a chain F2 and F3 are of comparable strength with such a quick study. 
- Betsy retook an L2L transfer function (just for sanity's), saw the same discrepant factor of two -- and some more Yaw resonant cross-coupling. Still F2 shows the majority of the badness.
- Decided just to swap the OSEMs, and hopefully move on. Below are the new serial numbers, open light current, and compensation gains and offsets. These *have* been installed. We'll take a new safe.snap this evening after all the commotion has died down.
- Betsy & Travis poked at this, looked at that, iterated with measurements several times on the floor.
- At last, Betsy went a long the signal chain, and made sure all connections were secure, and finally found this bad connection at the in-air connection at the feedthrough.
- Simultaneously, Travis loosened up the the cable loop from the optical table to the top mass. This may have alleviated the extra Yaw peaks that had shown up today. 

Open light current values and serial numbers for the new OSEMs.
      Raw    New     New        S/N
      ADC    Gain    Offset      
R0F2 25646   1.170   -12823     077
R0F3 26554   1.130   -13277     147

We'll also update the OSEM chart and grab a new safe.snap once transfer functions are finished.
 

B. Weaver, T. Sadecki, A. Pele, J. Kissel

In hopes of find a smoking gun in a dead OSEM LED or photo-diode, we backed off the H1 SUS ITMX's R0 F2 and F3 OSEMs and gathered a new measurement of their open light current. Sadly, the difference is at most 5-10%, and does not explain the factor of two seen last Friday (LHO aLOG 12522). Thus far we haven't changed the OSEMINF compensation values to match the new reading, because we're not sure if we're gunna swap out the OSEMs yet. Or next step is to drive alignment offsets and compare against other suspensions to see if the coil / actuation side of the OSEM is the culprit. We'll also measure coil resistance. (Remember, the electronics chain has been exonerated with the cable swap test we did on Friday).

For reference:
      Raw   New    New      Former   Former
      ADC   Gain   Offset   Gain     Offset
R0F2 28600  1.049  -14300   1.003    -14958
R0F3 26320  1.140  -13160   1.063    -14114

Obtained using the following matlab script:
/ligo/svncommon/SusSVN/sus/trunk/Common/MatlabTools/
[resultstring gains offsets] = prettyOSEMgains('H1','ITMX');

Joe and Andres finished adjusting QUAD08 so I started a round of TFs on both chains at 12:52. Order is undamped M0, R0, then damped M0 and R0.