[Arnaud P, Stuart A]

Following doors being re-hung on the HAM5 chamber earlier today (see LHO aLOG entry 12915), Phase 3a DTT TF measurements have been taken this afternoon for SR3 (HLTS) suspension as follows:-  

- SR3 M1-M1 undamped results (2014_07_22_1200_H1SUSSR3_M1_ALL_TFs.pdf)

HAM5 ISI Status: ISI unlocked, no damping or isolation loops running.

SR3 alignment: No offset was applied during this measurement.

SR3 undamped measurements from above have been compared with previous measurements for H1 SR3 at Phase 3a of testing (allhltss_2014-07-22_Phase3a_H1SR3_UnDamp_ALL_ZOOMED_TFs.pdf). The plot key is as follows:-

Blue Trace = Model (hltsopt_metal)
Orange Trace = H1 SR3 M1 (2014−07−15_1089513028), (in-chamber, doors open)
Black Trace = H1 SR3 M1 (2014−07−21_1090036316), (in-chamber, doors hung)
Magenta Trace = H1 SR3 M1 (2014_07_22_1200), (in-chamber, doors hung)

It can be seen that despite having gone in-chamber to improve the M3 alignment and attempt to mitigate any sources of rubbing (which we thought we had) the peculiar damping of the first vertical mode persists. Furthermore, comparing before (Black trace) and after (Magenta trace) there appears to be no improvement.

Somewhat frustratingly, before closing up the chamber, higher resolution measurements of the vertical DOF TF had indicated that the potential rubbing issue had been alleviated (see SR3_V2V_Doors_Open_vs_Closed.png).

We had considered the possibility of hanging the door may have changed the air flow due to purge air, so we carried out a measurement both with purge air on and off (SR3_V2V_PurgeAir_Off_vs_On.png), but again this failed to improve the Q of the first vertical peak.

Finally, a measurement was made with damping loops on for comparison (see SR3_V2V_Damping_On_vs_Off.png), which seems stable.

Also, last night Arnaud repeated the vertical TF while applying +/- biases to various degrees of freedom to try and check in which way SR3 could have been hung up, but to no avail.

Attached below is a log of particle counts taken during the HAM5 work covering the duration 1035 to 1126 (local).

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

(Dan, with pointers from Jeff and Arnaud)

Yesterday and Friday I measured spectra and transfer functions for the tip-tilts in HAM6.   The transfer functions were taken with the tip-tilts in the undamped state, the spectra were taken with the damping both on and off.  The transfer functions all agree with the model.

These TTs are not in their final positions and they only have temporary dog clamps (two each, I think, instead of the nominal four, and they're not torqued to any precision), so these measurements will have to be repeated once the optics in HAM6 are aligned and clamped.

As for the OMC, Arnaud captured TFs a month ago; things looked good.

J. Kissel, R. Schofield

I discovered a lonely, forgotten, disconnected GS13 hiding under BSC9 (H1 ETMX) chamber today. I attach pictures. 

Things that Robert and I can surmize:
- It's serial number is 574, and has a "property of the USGS, greater than $5k" sticker on the side with the number G12077 and a bar code.
- It may have been used for S5/S6 feed-forward studies (Will check with Mike, Keita, Richard)
- Ski may have purchased it, given the bar-code on the side (Will check with John)
- It's a 2005-ish era model, based on the color of its can and unfinished look of the feet.
- It's currently configured as a horizontal
- It claims of a broken locking mechanism, but after a few turns the mass seemed locked enough for transport
- It's functionality is unknown.

Finder's keepers ...

J. Kissel, for R. Schofield and R. McCarthy

While in the EE Lab today, I discovered an STS peaking out of the corner under some boxes. Asking around, Robert / Filiberto confirm that this STS is the H1 Vault STS that has been retrieved for the recommended repair at the beginning of the year. Robert recalls removing it from the vault on 2014-Jun-18. It will be sent out to Quanterra for repair, in due time.

The STS's serial number is 89921. 

The breakout box / satellite box that goes with the STS has been left out in the vault. 

Note: this is a PEM STS2, NOT an SEI STS2. It should be returned to the vault once repaired.

J. Kissel, H. Radkins

To investigate the H1 EX GND T240's input matrix confusion, I drove down to the end-station to check the alignment of the T240. I've found the "N" label pointing in the North direction, which for LHO is the +X direction. Seems logical. 

However, looking further into the T240's user's manual, on pg 23, section 5.2, table 5-1 (for revision 6; in revision 4 has this table on pg 14, section 4.4, table 4-1) it states 

Axis    Orientation        Positive Voltage
 X       east-west         represents motion to the east
 Y       north-south       represents motion to the north
 Z       vertical          represents upward case motion

Hence, the "N" label should be aligned parallel to the Y axis, and it is not. 

We've misplaced all of our alignment rods (STS2s and T240s alike), so Hugh's ordering some stock to make several "swizzle sticks" which have ends that fit in both instruments (see SEI aLOG 523 for dimensions of the alignment holes). Once we have an alignment rod, I'll rotate the T240 and correct the input matrix.

The attached pictures show proof of the mis-alignment:
Page 1: From a distance, looking EAST (-Y direction), with the WEST wall at my back, and BSC4 to the left; the T240 sits in its black igloo at the focal point of the picture.
Page 2: A little closer now, igloo removed, looking in the same direction (EAST, -Y).
Page 3: Even closer, but now I've rotated to look DOWN, SOUTH (-Z,-X) direction, with the +X direction and BSC4 at my back.
Page 4: And ... scene. Looking in the SOUTH / -X direction I see the "N" staring me in the face. Eureka!

[Arnaud P, Stuart A]

Purge air was turned off at the valves near HAM4 and HAM6 in the LVEA at 5:20pm (local) while we take measurements on the SR3 (HLTS) suspension.

added 368 channels, removed 367 channels
The number of unmonitored channels dropped from 354 to 13. The list of unmonitored channels is attached.

Following doors being hung on the HAM4 chamber earlier today Phase 3a DTT TF measurements have been taken this afternoon for SR2 (HSTS) suspension as follows:-  

- SR2 M1-M1 undamped results (2014-07-22_1200_H1SUSSR2_M1_ALL_TFs.pdf)

HAM4 ISI Status: ISI unlocked, no damping or isolation loops running.

SR2 alignment: No offset was applied during this measurement.

SR2 undamped measurements from above have been compared with other H1 HSTS suspensions at the same Phase of testing (allhstss_2014-07-22_Phase3a_H1SR2_UnDamp_ALL_ZOOMED_TFs.pdf). The plot key is as follows:-

Blue Trace = Model (hstsopt_metal)
Orange Trace = H1 SRM M1 (2014_07_21_1400), Phase 3a (in-chamber, doors hung) 
Magenta Trace = H1 SR2 M1 (2014−05−07_1083546862), Phase 3a (in-chamber, no doors)
Cyan Trace = H1 SR2 M1 (2014−07−22_1200), Phase 3a (in-chamber, doors hung)

Summary:

It can be seen that back on May 7th SR2 M1-M1 TFs looked good (magenta trace). However, subsequently, SR2 appears to have developed an issue with the M1 LF BOSEM channel (cyan trace). This was not evident in recent TFs taken during close-out activities since there is a window of opportunity to take P and V DOFs. We next need to further investigate the actuation chain (applying offsets, measuring coil resistances etc.) to determine if the fault resides in-chamber or with the electronics.   

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

After HAM work subsided and we were able to get into the BSC, we worked on the ITMy reaction chain DOF alignment as well as the lower stage OSEM alignment.  More of the same tomorrow.

IAS needed a 0.2 mm shift to the North (+X) to bring the SUS into spec position.  I closed the RZ loop at the past (last few weeks while position loops were NOT closed) location(-16200nrad); then I drove the X degree 200000nm from its free hang position.  Jason was unable to see this change and it turns out that this amount of shift is barely out of the instrument resolution.  I drove it another 100um and the shift now is revealed.  The free hang position of the HEPI X Dof was -8000 so I've rounded the Bias Target to 300000.  I believe this position will satisfy IAS.

The Ry Dof was unstable so that will have to be worked out before HEPI can be unleashed completely.

LVEA laser safe

08:35 Scott from Apollo sheet metal on site
08:38 Several surf students going to End-X for PEM testing
08:52 Darkham & Forrest – Going to End-X
08:52 Matt, Kate, Apollo – Working on SR2 and reinstalling door on HAM4
09:22 – Richard – In LVEA for survey
09:25 Travis – Pulling PCal target at End-X
09:25 Nathan – Working in the Optics lab
09:57 Scott from Apollo sheet metal on site
10:00 Arron – Working on Illuminator switch and noise eaters at End-Y
10:00 Cyrus – Fixed JRE error on control room video monitor terminal
10:20 Apollo – Pulling HAM5 south door    
10:30 Matt, Jeremy, Stuart – Going into HAM5 to check for rubbing on SR3
10:41 Karen – Going to End-Y 
10:55 Dave & Jim – Working on hardware watchdogs software at End-Y
11:05 Mike V. – Going to End-X
11:30 Apollo - HAM5 Door replaced
11:42 Paradise Water on site for delivery
13:30 Matt & Jeremy – First contact work in BSC3
13:30 Betsy & Travis – Installing BS baffle in BSC2 and working on BSC1 alignment
13:58 Jim – Balance work in BSC2
14:03 Gerardo – Going to End-X to work on PCal viewport
14:05 Doug & Jason – Alignment work on ITMY
14:15 Jeff – Tilt meter investigation at End-X
15:05 Dave – Restart PEM models to pick up name changes and then will restart the DAC
15:19 Hugh – In LVEA to work on ITMY alignment

I went into BSC2 this afternoon and unlocked and rebalanced the ISI. I started by removing 2 kg of optical table mass in a pattern roughly evenly distributed around the SUS. I then unlocked St2 and looked at CPS's, but the level was still slightly out of spec. I then removed some side wall mass from St2 (a D071200 t1), which brought St2 into spec. I then unlocked St1, took another look at cps's, found everything happy enough, so I packed up. I left the ISI unlocked as I'm hoping to run tf's soon.

Robert, Christina and Dave.

Some PEM names were changed in the CS and EX models. The CS changes are to standarize channels with FLOOR in their names (e.g. FLOOR_XCRYO becomes LVEAFLOOR_XCRYO). The EX change was to fix an incorrect name  (ACC_OPLEV_ETMX_X becomes ACC_OPLEV_ETMX_Y).

the h1pemcs and h1pemex models were restarted, followed by a DAQ restart.

The DAQ restart cleared the 0x2000 errors on the ODC EX and EY models.

Jim and Dave.

After seeing some confusing trend data about what the default RMS-trip level and time-to-kill times are (should be 110mV and 20mins respectively), we went to EY and performed the following tests:

pre-test: put SUS, ISI and HEPI into safe states, no DAC drives anywhere. The IOP SWWDs for SUS and SEI were panic'ed.

1. powered down the HWWD, verified 3 ISI Coil drivers were powered down.

2. powerd up the HWWD, noted it would not boot until we pressed the front panel reset button.

3. read the HWWD settings via BIO connection to h1susetmy model's hwwd part, settings of 110mV and 20min confirmed

4. restarted the h1susetmy model, noted that the hwwd part in the model seems to program the HWWD without being asked to

5. unplugged the control BIO cable from the back of the HWWD (retaining the monitor BIO cable), restarted the h1susetmy model. Its hwwd programming part froze with lack of acknowledgements, but the LED monitoring continued to work

Lastly we plugged everything back in, un-panic'ed the IOP SWWDs, damped/aligned SUS, damped/isolated SEI.

Manual DTT transfer functions are now running on SR2 and SR3 for the next few hours.