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.

J. Kissel, A. Pele, H. Radkins

We found the problem quickly, because we've seen it so often at this point, but the IOP software watchdog prevented HEPI and ISI ITMY actuation (zeroed DAC outputs) because the SEI shutdown bit was latched RED, when the SUS was still green. The ISI and HEPI overview screens have NOT been updated with the new channel structure yet, so the IOP WD trip warning is white -- and therefore the warning is not obvious.

Restoring actuation was a matter of resetting the SUS-ITMY DACKILL state (even though it was green), and then resetting SEI-ITMY DACKILL state.

We need to update the HEPI and ISI overview screens. 

(Note, we understand *why* the SEI shutdown bit was initial triggered -- Jim / Travis were unlocking the ISI with a free suspension.)

Jeeezz.   We (SEI) partially locked down HEPI for sealing up the vacuum system.  Partially because only the outer vertical screw and the two outboard radial screws of each of the four corners were brought to bear.  This was a mistake in many ways.  No alog can be found documenting this, the signs on the pier were not changed to reflect the state, and the partial nature of this lock, allows the Rz actuation to be realize albeit likely with some difficulty.  This state would have allowed some of the HEPI Position loops to function but likely poorly.  Rz would have dragged on these radial screws, Rx & Ry would have worked but only at Zs expense.  X & Y would be pushing directly on the screws.  I'm very surprised this was able to function at all.

HEPI TFs & other tests were run before this lock down so they are valid.

Hence forth, no HEPI shall be locked without the issuance of a work permit.

Hoping to alleviate ITMY quad weirdness.

ITMY diagnostics ongoing, will try unlocking ISI
Pulling IAS from spool
CPB install starting after, spool needs moved
TMSX work ongoing, measurements show rubbing


Remember to close your bags of pre-soaked wipes, after use

Safety was discussed. Watch for elk along 240.

ITMY diagnostics ongoing, will try unlocking ISI
Pulling IAS from spool
CPB install starting after, spool needs moved
TMSX work ongoing, measurements show rubbing


Remember to close your bags of pre-soaked wipes, after use

Safety was discussed. Watch for elk along 240.

Apollo, Matt

When we put the north door on HAM4 last week, we noticed that first contact was still on the inside and outside of the viewports. This morning Apollo pulled the two viewports in question off the door (I did particle counts of the cleanroom and of the purge coming out of the chamber through the viewport aperture on the door and all counts zero).

The top gun was used in the removal of the first contact to blow during and after the first contact was peeled. The first contact must of been some of the original first contact and been on there a long time as it took quite a bit of force to "break the seal" to get the first contact to start to peel (it was a pour application of FC on the viewport it appeared).

After peeling I inspected the viewports. The one that came off the centre of the door looks like it has a scrath..and I want to say its on the inside, and its not in the centre but off to one side, perhaps 1-1.5inches long,  but I only had a quick look and pass it off to the experts to do a more detailed look as I didnt have any swabs, etc on me to investigate it. I shoudl of taken a picture. Didnt even think of that I am sorry. In the meantime I asked Apollo to put a blank on that port. The other viewport looked fine and so I informed Apollo to put that one back on in the same spot it came off.

model restarts logged for Tue 29/Jul/2014
2014_07_29 12:05 h1iopsusauxey
2014_07_29 12:06 h1iopsusauxey
2014_07_29 12:07 h1iopsusauxey
2014_07_29 12:08 h1susauxey
2014_07_29 12:10 h1susauxey
2014_07_29 12:34 h1iopsusauxey
2014_07_29 12:40 h1susauxey
2014_07_29 12:42 h1susauxey
2014_07_29 13:11 h1iopsusauxey
2014_07_29 13:28 h1susauxey
2014_07_29 14:08 h1iopsusauxey
2014_07_29 14:45 h1iopsusauxex
2014_07_29 14:46 h1iopsusauxex
2014_07_29 17:11 h1iopsusauxex
2014_07_29 17:12 h1susauxex
2014_07_29 17:13 h1iopsusauxey
2014_07_29 17:15 h1susauxey
2014_07_29 21:42 h1fw0

maintenance day 2.9 testing on sus-aux. Unexpected restart of h1fw0.

During close-out work on the ETMX chamber, and while waiting for particle counts to drop, I took power spectra up to 50 Hz for both ETMX (QUAD) and TMSX (TMTS) suspensions (n.b. suspensions were still locked).

I observed a higher noise floor, of almost an order of magnitude, for the ETMX L2 (PUM) UL sensor channel (see ETMX_Original.png below).

To help determine if the source of the excess noise resides in-chamber or with the electronics chain I swapped the ETMX L1 and L2 stage in-air field cables at the Satellite Box (H1:SUS_ETMX-17 and H1:SUS_ETMX-17) and re-took the power spectra (see ETMX_Swapped.png below). It can be seen that the excess noise now moves from the L2 stage to L1, thus indicating that the source of the excess noise is down-stream i.e. with the field-cables or in-chamber.

Ideally, the above test should be repeated at on the air side on the vacuum feed-through to eliminate the field cable. However, most likely, this is an in-chamber AOSEM cabling/connector issue.

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...

Calum, Kate, Rich A, Nichole, Betsy

Reporting for the team last night:

After collecting all of the required equipment, we started the ITMx First Contact cleaning at ~5pm yesterday.  We used the spray cone to apply a nice coating to the CP-AR and then to the ITMx-HR.  When we did the ITMx-HR we had to slide the ACB wedge part way out in order to have the ACB swing back in such a way to not interfere with the spray cone attached to the front of the QUAD structure.  Reportedly there is a new cone somewhere that does not interfere with the ACB fully swung back.  Will continue tracking said cone.  The plan is to clean the chamber and continue with other mechanical closeout items before pulling the FC and closing the chamber door (the typical procedure).

Prior to starting the First COntacting of the ITMx-HR surface, we attached the green lantern fixture and inspected for particulate on the surface of the optic.  A few weeks ago, we used the fixture to spot ~2 particles per sq. inch on this surface.  Since then, much in-chamber activity has taken place.  Yesterday, we spotted ~5-10 particles per sq. inch.  We should inspect after we pull the FC.