Uninstalled one of two Mad City Labs PZT controllers and the PZT connected to it on the EY ALS table.

The driver is a fanless Nano-Drive (not Nano-Drive 85 with a fan) which is at the bottom of the overhead rack. The PZT is the one with 1" mirror close to the Faraday. These are sent back to the manufacturer.

Before pulling the PZT out, we restored HEPI, ISI, EY and TMS suspension so that everything is at roughly the right angle, injected the green beam, enabled the QPD centering servo so the beam hits the center of green QPDs, confirmed that the beam retroreflected by EY was coming back to the table, held the output of the PZT output and turned the servo off, and marked the beam path using irises. This will allow us later to reinstall the PZT without losing the input pointing.

For future reference, here is the cable numbers on the front panel:

X (PIT) cables:

WBSC6-RF28-1: Input X

RF29-1: Sensor X

RF29-2: HV/10 X

Y (YAW) cables:

RF28-2: Input Y 

RF29-3: Sensor Y

RF29-4: HV/10 Y

X and Y DB9 cables are connected to the X and Y feed through on the ALS table.

The mirror was dirty (some pictures to be attached later). Most of them went away with a gentle wiping, but some big ones persisted. Also, we couldn't find any obvious way to remove mirrors. It seems as if it was glued, so we're sending it back to the manufacturer with the mirror.

I installed modified IOP models for the three LVEA test stand front ends: h1iopsusquadtst, h1iopsusbstst and h1iopseitst. I completed the H2 to H1 renaming and added user switches to enable and disable the watchdogs via EPICS records. The WD MEDM screen was changed to include the WD control buttons.

We started up the H1 BSC1,2,3 SUS frontend for the first time (h1susb123). I created an IOP model with SUS Watchdog for the ITMY and BS top OSEMS.

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot from approximately 7 PM Nov. 13 to 7 PM Nov. 14. Also attached are plots of the modes to show when they were running/acquiring data.

[Paul, Giacomo]

After moving the HAUX on the HAM table, we observed an overall reduction in OSEMs open light values (OLV), with relative changes spanning from a few % increase to up to almost 30% decrease (see entry 4603). This triggered the need for some debigging, that is summarized here.

First of all, we discovered that there was an error in the out of vacuum connections: as a results, different electronics channels were reading different OSEMs, making the measurement not directly comparable with the ones taken chamber-side (channels and OSEMs have all different "gains", so when you change the pairing...).

Once proper connections were restored we took a series of OLV measurements in which each OSEM of a single HAUX was read by each of the same HAUX's electronic channels. Nothing magic in this particular combination, just a way of having an "OSEM vs channels" matrix to use for some statistics. We obtained a matrix like the following for each suspension:

As we wanted to calculate a sort of "gain" for each OSEM, independent from the channel it was connected to, we proceeded as follows:

- took the OLV reading of UL_OSEM with UL_CH, and divided it by the average OLV read by UL_CH on all 4 OSEMs (same row)

- repeated the above calculation using UL_OSEM and LL_CH, UR_CH and LR_CH

- averaged these 4 values (same columns) to obtain the "gain" for the UL_OSEM

We repeated the exact procedure for all 4 OSEMs of a single suspension.

We then calculated a "gain" for each channel as well, using the exact same procedere but swapping rows with columns. The following table reports the OSEMs and channels "gains" calculated this way (the full set of data is available in the attached pdf):

From this table, the channels seems to have very consistent "gains" (to within a few percent). The OSEMs show somehow more variability, as probably expected. particularly "bad" is the spread in the IM1 OSEMs...

As of now, the OLVs are as follows (with the "Aug-12" column reporting the values read in august during chamber-side testing):

Overall, there is a reduction in the 5-10% range, maybe due to increase resisitance in the new cables (as observed by Jeff in entry 4541); I don't have the data for the previous and current lenght and/or resistance of the cables, so I cannot confirm this.

In addition, IM1_UR and IM3_LR both show a reduction significantly bigger than the others (and the lowest absolute OLV values); also, for some reason they were reading even lower values (by about 10-15%) during the OLV matrix measurements than reported in the above table. A closer look at the recorded data (see attached png) shows that the change happened "during" the OLV matrix measurements: they were both reading about 20k before the OLV matrix measurement (also taken as the first value for the diagonal elements in that measurement); after being disconnected and reconnected several times, they were put back in their original positions and the readings increased to about 22k. The reason for this is unclear and may require further investigation.

  We put ITMY in stops for the BSC2 cartridge install.

  We had a small issue with the bump stops between the CP and Test mass touching. We could not engage the face stops enough to hold the Teflon strips in place without the inside bump stops coming together. This occurred even when the barrel stops were in so tight the fluorel cap distorted. Therefore, we put Teflon transport caps on the CP face stops to cover the fluorel & fused silica tips. We put the Teflon strips, freed up from the CP face stops, between the bottom and both side bump stops between the CP and Test Masses. This will prevent glass to silica contact between the two masses during transport.      

M. Barton, (J. Kissel)

After the IAS/SUS team performed the final tweaks on H1SUSITMY, Mark (late last night!) remeasured each chain's TOP to TOP transfer functions. I attach the processed results. Baring noise arising from the in-air measurement, the mechanics look as good as they did at-vacuum in chamber, back in late May. In fact, it appears as though the alignment tweaks had little to know affect on the dynamics. Nice work all!

I approve this QUAD for re-re-re-installation. (Don't worry, we've still got one more!)

Interesting note (which is of no consequence but academic): this QUAD's Thin CP has been flipped, as per E1200943. Because we've assembled the TCP and ERM prisms to have a physical d4 of 0 mm (i.e. the prism break off is "exactly" ([+/- 1 [mm]) parallel to the optic's horizontal centerline, see T1200487), the dynamics should not have changed after flipping the TCP. However, as can be seen on pg 11 (R0 P to P) of allquads_121115_H1SUSITMY_Phase2a_ALL_ZOOMED_TFs.pdf, the (poorly modeled) P/L mode that was (measured) formerly at 0.74 Hz has moved up to 0.77 Hz. This mode is known to vary almost entirely due to changes in effective d4 ( = physical d4 + flexure correction). Assuming that the flexure correction (dependent on wire parameters and the tension on them from the optic mass) has not changed substantially (if at all), this implies that the physical d has changed with the flip, further implying that indeed the prisms are not bonded exactly along the optic centerline, but slightly below the center line (where "below" is defined by its original orientation, yet presumably still within the +/- 1 [mm] tolerance). That pitch is too sensitive, I tell you!

[Joe Gleason, Chris Mueller, Alberto]

Yesterday we set the lenses on the ALS path on the PSL for mode matching to the ISCT1 table.

The ideal solution had a R=75mm lens and a R=257mm lens placed after the ALS Farady and separated by about 60cm (see LIGO-T1200471-v5 for details). Ideally this should have given us a waist of 68um radius between thw two lenses and a collimated beam of 3mm radius after the second lens. In actuality we measured a waist radius of 75um between the two lenses and becasue of this the second lens was placed at a different distance than designed. The beam coming out of the second lens had the desired size, however, due to the limited room on the table to do a long range beam scan, it was not easy to assess whether the beam was actually colimated, rather than diverging/diverging.

To be sure that the beam would not further diverge on its path to ISCT1, we set the second lens such that the beam would slightly converge over the 50cm or so that it covered over the table.

When the ISCT1 table is installed, someone will have to finely tune the position of this lens, if the beam size at its arrival on the table is not as desired. 

Mode matching on ISCT1 is designed to accept basically any relatively large beam (~>1mm) which arrives to the table almost collimated.

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot from approximately 8 PM Nov. 12 to 8 PM Nov. 13. Also attached are plots of the modes to show when they were running/acquiring data.

Apollo, Jax, Thomas

We completed the mechanical installation of the H1 ITMY Optical Lever, all of the components fit together as designed and the QPD currently reads back a signal into EPICS via these channels:

H1:SUS-QUADTST_L3_OPLEV_PIT_OUTMON
H1:SUS-QUADTST_L3_OPLEV_YAW_OUTMON
(with H2 ITMY calibration parameters but these are no longer valid, will re-run test for new parameters once the cartridge is installed, the optic damped, and the chamber pumped down)

These channels run into the test stand electronics in the LVEA at the moment but will soon be plugged into the permanent H1 OptLev channel in the H1 electronics bay, cables to be ran. 

Next we have to align, measure the waist and calibrate the signal.

[Joe G., Luke W., Cheryl V., Chris M.]

Today we realigned the paths on the PSL table according to D0902114 with a few minor exceptions.  The first exception is that the ALS beam path was moved two inches closer to the reference cavity to give some more room between the EOM and ALS Faraday.  The second exception is that the optics which were moved to accommodate a possible periscope shift (alog 4662) were left in place even though the periscope was not shifted significantly.  

In addition the periscope was removed in order to fix the damping goo problem and put back in place.  

As of now the PSL is ready to inject a beam into the HAM 2 chamber for IMC flashing and alignment, which we expect to do tomorrow evening.

Purge air depressurized for ~15 minutes around 1615 hrs. local

BSC1 (Cartridge)

• Cartrdige/ITMy Alignment work (Doug):  requiring Laser Hazard soon---MAKE SURE TRANSITION CORRECTLY!!!
• Cartridge Insertion:  Not today most likely (prep)
• Prism Photo Survey (Margo/Kate): 
• Cleanroom/Platform moves (Bubba)
• Cabling Satelite -> feedthrus in the morning (Filiberto)
• Dial Indicators (Hugh)----wait for after Robert

PSL/IO: 

• PSL Table:  New spacers under PSL Periscope
• HAM2 work
• Michael turns laser ON at 9:47am

Septum viewport install HAM1/2

Viewports installed on top of HAM2 (center & north)

BSC2 Cartridge

• Mass pulled
• cable routing
• float

Optical Lever (need for Robert's test)

• transmitter complete
• receiver being installed for ITMy (Thomas & Jax)

DAQ Work

• h1daq restart (for slow controls)
• front ends going down (as bring in new front ends)
• lsc & asc

EX--clean & dome ready to be removed (maybe this afternoon)

Bubba said, "Clean stainless is being loaded into bin"

The LVEA is now in LASER HAZARD from about 10am - 1pm.

EY Dust Alarm (gerardo, worden, jodi)---note:  Access System is not communicating to EY & EX

EY Chiller Yard alarm (due to Robert measurements)

Maintenance:

Pallets picked up near Staging (two loads)

Fire Dept on site.

A staging cleanroom was moved from the HAM1/2 area to BSC1/HAM3 area and then the central curtain partition was installed to create a garbing/staging cleanroom. Cris cleaned once the cleanroom was in place. Folks working in BSC1 (Lower Level) and in HAM3 should be able to garb and stage from this cleanroom.

Mark B. 

Commencing DTT TFs on ITMy. Will get as far as possible this afternoon and then continue this evening. Priority is M0 and R0 undamped, then M0 and R0 damped.

• ITMy/CPy Gap: 20.35 mm
  • Target: 20 mm
  • Tolerance: ±0.25 mm
  • A verbal waiver on the 0.1 mm out-of-spec on the gap was given by N. Robertson, since this is not the final CP (there will be a switch at a later date)
• CPy Pitch: 1.16 mrad down
  • Target: 1.33 mrad down
  • Tolerance: ±1.4 mrad
• CPy Yaw: 582 µrad CCW
  • Target: 0.0 mrad
  • Tolerance: ±1.4 mrad

• ITMy Pitch: 29 µrad down
  • Target: 12.5 µrad up
  • Tolerance: ±160 µrad
• ITMy Yaw: 7 µrad CW
  • Target: 0.0 mrad
  • Tolerance: ±160 µrad

[Giacomo, Paul]

Yesterday we made some preliminary tests of the HAM AUX suspensions in the HAM2 chamber. We released the earthquake stops and checked that we could read sensible data from the OSEMs, and actuate the mirrors too - all of them looked fine, so the questionable cable connection mentioned in entry 4593 doesn't appear to be a problem. We then put the earthquake stops back in place and moved the HAM AUXs into the middle of the table to keep them out of the way for the moment (since we don't have dog-clamps to hold them down). We pulled the OSEMs out to make open light measurements (see comment from Giacomo in the near future). At first glance these look fine.