After HAM2 doors went on, IMs tfs were ran last night (IM1 IM2 IM3 and IM4). The ISI was damped during the measurement. They are showing good agreement with the model, similarly as before HAM2 closeout. The results are attached below showing a comparison between all the IMs and the model.

Data and scripts were commited to the svn, particularly plothaux_matlabtfs.m (under sus/trunk/HAUX/Common/MatlabTools) with the corrected calibration (thanks to Jeff)

Travis S. Gary T. Matt H. Greg G.

Final (hopefully!) alignment of the in-vacuum optics for TCS was completed today. ITMx had already had an alignment done by Thomas Vo and myself last month, but Travis and I made sure things were well centered on SM1 in BSC3. A range of motion test showed no clipping throughout the compensation plate for ITMx.

For ITMy I was aided by Gary and Matt. ITMy was an initial alignment and took a little more finagling. The periscope on the table had to be adjusted a bit, and some small adjustment to SM1 was done; but otherwise alignment went smoother than I expected. The beam is traveling a little high through the outside viewport optic on BSC1 but is well centered on the inner optic. The range of motion test showed there to be clipping on the Y arm elliptical baffle towards the upper range of motion.

Matt noticed irregularities on the surface of the mirrors and will hopefully be able to post pictures later.

Following on after-HAM3-closeout tfs results of lowest stages of PR2 -which were showing high q resonant pole at 45 Hz in the M3 L-LR transfer function-, and in order to determine if the problem is in chamber or in the electronics chain, I swapped middle stage and bottom stage cables at the in-air vacuum flange of HAM3 (respectively H1:SUS_HAM3-25 and H1:SUS_HAM3-26), and took those measurements again.

As showed on the attached screenshot, the pole moves to the M2 LR-LR tf after swapping the cables, and disappear on the M3 LR-LR tf, which eliminates issues in the electronic chains, and indicates that the problem is in-chamber.

Obviously, the cables were swapped back to their nominal position

Matlab TFs are set to run at the X end station overnight as follows:-  

- TMSX (TMTS) M1-M1 undamped TFs

Starting now, and when complete the measurement status will revert to OFF and damping loops will be restored to the ON state.

These measurements have been initiated from the opsws2 workstation.

These should wrap up with plenty of time to spare before Jim's measurements start.

Gary, Matt, Danny, Keita, Stuart, Norna

-First contact was applied to an ALS view-port.
-UL AOSEM was swapped as a noise check.
-Noise spectra for the OSEM was ran in several scenarios.
-TMSX was checked for rubbing.
-TMS BOSEMS were centered without the offsets.
-UL AOSEM was put back into the PUM and its flag was re-centered. (seems as though the noise is from an SRS cable at the feed through)
-First contact was removed from the view-port.
-View-port was inspected with green light.
-Both suspensions were left unlocked for TFs.

Things left to do:

-Lock ETM for first contact removal.
-Remove first contact.
-Inspect the optic with the green light.
-Swing the baffle back down.
-Unlock suspension and set the EQ stops and lock the nuts.
-Center OSEMs if needed.
-Run quick TFs for rubbing check.
-One last wipe down.
-Replace door.

CC wafers will be added to the chamber at the proper time.

Note: The floor was wiped after every exit today totaling 3 times. 

Going to be lazy and do it via photos. The titles of the photos tells what was going on:

So one thing to look at is the later photos where side by side I have showed the counts reistered by the particle counter Jeff has been using (white casing Met one particle counter) compared to the syle of particle counters avaialiable to on-site personnel (grey casing Met one particle counter). These readings were taken at the same time, in the same place, for the same duration. Gary was the first to point out to me that to first order the White casing Met one counter is a factor of 10 lower than the grey casing met one particle counter. Is there perhaps a setting that is wrong on one of them, as this isnt the case for just one reading but al lthe readings taken side by side with the two counters.

Wanted to confirm the target numbers for the ETMY position loops.  The Rx & Rz positions have been at their target positions since it appears the HEPI was partly locked late March.  Before that lock and subsequent HIFOY the Rz was drifting to -20000nrads which was a good place for IAS--see alog 10765.  However, when the HEPI was locked, it was pushed and drifted by early April to ~6000nrads.  The Bias Target position is and has been set to 6700nrads.  If the IAS alignment is still valid under vacuum, these target might be more help at -20000nrads.  The Rx similarly moved from 2000 to -12000nrads when HEPI was locked.  The Bias Target is currently -10900; likewise, it might relieve TMS or others to be reset to 2000.

Attached is 120 days for Cart Basis Positions with the notes of use.

Giving Jeff and Stuart 6 hrs to run their measurements. I cut down on reps for less important frequency bins, so maybe done in the morning.

9:00 Travis, Me to ITMY to unlock ISI
9:00 Corey to lvea for 3ifo enclosures
9:15 JeffB to HAM6 for door pull, out at 10:15
9:30 Surf students to EX for EE work
9:30 Karen to EY, back at 10:45
10:00 Nathan to optics lab, turning on laser
10:15 JeffB to EX
10:45 Jason to LVEA to look at ITMY
11:30 Jason to LVEA, tearing down IAS, out at 12:00
13:00 Betsy, Greg to BSC3
13:00 Mitch to CPB install, out at 15:45
13:15 Manny to Ex looking for stickers
13:15 Gerardo to HAM6
13:15 Gary, Matt, Stuart to EX
14:45 Arnaud to HAM3, swapping pr3 cables
15:15 PEM crew to mids and ends to retrieve gear

ITMy

• X axis position: -200.8 mm*
  • Target: -200.0 mm
  • Error: -0.8 mm
  • Tolerance: ±1.0 mm
• Y axis position: 4982.7 mm
  • Target: 4983.1 mm
  • Error: -0.4 mm
  • Tolerance: ±3.0 mm
• Z axis position: -79.2 mm
  • Target: -79.8 mm
  • Error: +0.6 mm
  • Tolerance: ±1.0 mm
• Pitch: 366 µrad down**
  • Target: 340 µrad down (352 µrad down FC correction - 13 µrad up target pitch)
  • Error: 26 µrad down
  • Tolerance: ±50 µrad
• Yaw: 17 µrad CW
  • Target: 0 µrad
  • Error: 17 µrad CW
  • Tolerance: ±50 µrad

CPy

• Pitch: 833 µrad down***
  • Target: 1.296 mrad down (to match the ITMy AR surface assuming zero ITMy pitch error; the ITMy has a vertical wedge of 0.075°, or 1.309 mrad down)
  • Error: 463 µrad up
  • Tolerance: ±1.4 mrad
• Yaw: 31 µrad CCW
  • Target: 0 µrad (to also match the ITMy AR surface)
  • Error: 31 µrad CCW
  • Tolerance: ±1.4 mrad

*** This is the actual pitch of the CPy.  The listed error is relative to where the CPy needs to be to be parallel with the ITMy AR surface, assuming the ITMy has zero pitch error; this does not include any FC correction done on the ITMy.  Since we cannot verify the ITMy pitch after FC removal, we also cannot verify the CPy pitch relative to the ITMy AR surface after FC removal.  We have to assume that E1200791 is correct (we have only been able to test this one time at the ETMy, which moved upward by 442 µrad, but one data point does not a trend make) and that the ITMy will pitch up by ~352 µrad upon FC removal.  Therefore our expected relative pitch between ITMy and CPy upon FC removal is 490 µrad up (14 µrad down ITMy HR pitch + 1309 µrad down wedge - 833 µrad CPy pitch = 490 µrad up relative pitch).  As stated above we can weigh the FC to get some idea of the pitch change.

ACB (relative to the ITMy)

• Lateral position error: -0.3 mm
  • Tolerance: ±2.0 mm
• Vertical position error: +1.2 mm
  • Tolerance: ±2.0 mm

This completes IAS alignment of ITMy; our equipment has been removed from the Y manifold spool area to allow for the Cryopump Baffle installation.  This also ends the IAS alignment of the aLIGO H1 interferometer.

This morning the HAM6 south door was removed for view port work. Particle counts taken during the operation were over all very good. 

In cleanroom before work - 0,  0, 0
In cleanroom door off = 11, 4, 1
In cleanroom door out of cleanroom = 8, 6, 3
In chamber cover on = 12, 5, 0 

Particle size above are 0.3, 0.5, and 1.0   

Doing a DetChar measurement under work permit #4762.

The HEPI Master Switch is open.  Both Stages of the ISI is in HIGH Isolated state under Guardian control.  Operators should reset the watchdogs (after appropriate investigation) and let Guardian go.  I have updated the ISI Isolation 'Correct State Bits H1:ISI-ETMY_ST1_ISO_X_STATE_GOOD.'  This will allow the ODC bit to go green.  Of course now I need to do a Safe.snap, soon. With the Master Off. 

Due to high dust counts in BSC-9 on Tuesday 7-29, there was an early morning cleaning of the chamber this morning. The chamber was wipe as you go cleaned on the way into the chamber and again on the way out. Particle counts were taken before, during, and after the work. The stairs leading into the chamber were also wiped down.  

Description                           0.3  0.5  1.0
In cleanroom cover on           79   27    3
In chamber cover on             26   17    6
In chamber cover 1/2 open    83   44    8

In chamber first cleaning         215  121   26
In chamber second cleaning   267  121   56

In chamber cover 1/2 open      505  245   60
In cleanroom cover on             19    8    1
In chamber cover on +5 min     201   98   27      

Prior to closing-out the BSC9 chamber and after unlocking the TMSX (TMTS) suspension yesterday, a full set of Matlab TFs were run overnight as follows:- 

- TMSX M1-M1 undamped (2014-07-29_1090716348_H1SUSTMSX_M1_ALL_TFs.pdf)

BSC9 ISI Status: ISI locked.

TMSX alignment: No offset was applied during this measurement.

Undamped measurements from above, have been compared with previous 'good' references taken during Phase 3 of testing (alltmtss_2014-07-30_Phase3a_H1TMSX_M1_Doff_ALL_ZOOMED_TFs.pdf). The plot key is:-

Blue Trace = Model Prediction (tmtsopt_production)
Orange Trace = H1 TMSX M1 (2013−12−05_1070337667), Phase 3a (free-air). 
Black Trace = H1 TMSX M1 (2014−05−09_1083659254), Phase 3b (in-vacuum).
Magenta Trace = H1 TMSX M1 (2014−07−29_1090716348), Phase 3b (free-air).

Summary:

All DOFs, but for T, are consistent with previous measurements. However, the second T mode at ~1.4 Hz shows signs of splitting. This is most likely as a consequence of alignment work being carried out also affecting the stiffness of the cable routing, as we have experienced at LLO (see LLO aLOG entry 11656).

Keita has been informed and has some concerns regarding free-swinging spectra, and will need to investigate further.

A damped TF was taken for the T DOF to check the performance of damping loops on the split mode feature (see TMSX_T_DOF_Damped.png below).

All data, scripts and plots have been committed to the sus svn as of this entry.

I'm running a few short DTT TFs on the ITMx in prep for chamber closeout evaluation.  We'll try to sprint this closeout this afternoon.

ISI is unlocked, ACB is in it's nominal position with "appropriate"  ECD damping.

ITMx SUS is unlocked.

Stuart processed the results from ITMy measurements ran overnight yesterday. The attached pdf compares this measurement with the one taken over the week end that was showing noise around a ~2.6Hz Roll mode in vertical long dofs for both main and reaction chain. The main difference between the two measurements was the ACB was locked last evening and unlocked during the week end. The ISI was locked for both measurements. It looks like the noise was reduced with the ACB locked, especially in the Long and Vertical dofs of Reaction chain (page 7/9). Since the main chain was still a bit noisy (p1/3) we asked Jim to unlock the ISI, to take some quick dtt measurements, and make sure it is independant from sus.
 

Yesterday there was some work done on the PSL racks, specifically to the AA chassis. Once this work was complete (PSL offline for ~16 hours) the NPRO recovered automatically, but no light was making it to the PMC.

I went into the diode room and found that the flow sensor was tripped. I added water to the crystal chiller and reset the flow sensor. Then I opened the HPO external shutter and the PMC  was able to lock successfully..

There is currently still an out-of-range warning on the long range actuator, which I do not understand. I thought the LRA was inside the HPO which is offline, but normally the LRA indicator in the sysstat window is not in a warning state.

Sometime between the SUS and ISI payloading mid-week last week the alignment of the ITMy QUAD wandered off.  The ACB install and alignment proceeded late last week.  On Monday (yesterday) we resumed realignment of the ITMy SUS.  This involved the usual many day effort of realigning all 3 stages of sensors during the test mass and CP pointing alignment.  By COB on Monday we had good sensor alignment and good IAS pointing, however we had a strange 2.6Hz peek on V and P DOF TFs.  Overnight TFs confirmed these peeks.  Today, we have again spent all day trying to understand and mitigate crosscoupling of this peek via shifting the sensor mounting box around and realigning the OSEMs each time.  No help.

WED

SUS and ISI Payloaded

Good IAS alignment, Good sensor alignment, Main Chain rubbing

THUR/FRI

ACB Install and alignment

Closed the ring heater.

MON

Main chain rubbing had been alleviated, IAS and sensor pointing ongoing

2.6Hz in some DOF TFs of M0 and R0

TUES AM

Sensor mounting table cloth realigned in an attempt to improve sensor centering along x - pushed towards main chain, all BOSEMs realigned.

Major L1 and L2 OSEM alignment coupled with both chain pointing alignments.

Checked a few flags that possibly were crooked.  None found bad.

No problems with cables, EQ stops or flags found between chains.

2.6Hz peek found to have moved to 2.4Hz.

TUES AFTERNOON

Sensor mounting table cloth realigned in an attempt to change any coupling seen by the sensors to mis-pitched/mis-yawed/mis-rolled top mass flags.  All 12 top BOSEMs realigned.

Tweeked slightly miscentered L1 Upper and Left BOSEM centering.

No problems with cables, EQ stops or flags found between chains.

Opened the ring heater (grasping at straws).

2.4Hz still there on both main and reaction.

TUES LATE PM

Locked ACB with 1 bracket in an attempt to stop what we observed to be a 2-3Hz bounce resonance.

Story TBC...