Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot from approximately 6 PM Dec. 2 to 6 PM Dec. 3. Also attached are plots of the modes to show when they were running/acquiring data.

Earlier this morning, Dave modified the IOP models at ITMY to reintroduce the WD between SEI and SUS computer. Then, we figured the BS was part of the WD (tripping the ITM). Dave removed the BS from the IOP WD in H1susb123.

Model modifications were also made in h1isiitmy and h1susitmy (IPC channels for the WD). After swapping and plugging few cables, we were finally able to drive the ISI. But due to data errors in the dolphin, the SUS-ISI connection broke frequently (cf error during 2 hours) then tripping the ISI. The reason is still unknown (SUS CPU maxed out?). Also, the WD bit sent by the SUS model should be high when the SUS WD is not tripped and low when SUS WD is tripped (or model/connection is dead/broken). Currently, this is not the case.

I temporary allowed 150 errors per second of transmission error (4K native rate => 36ms) to run some measurements overnight.

[Filiberto / Kiwamu]

 We have installed some more Dsub cables in the field rack ISC R1 (the one near the PSL room and HAM1). These are necessary for the upcoming IMC locking.
A next step we have to do is to pull long Dsub cables from the remote rack place to the R1 field rack. This will fully allow us to do the remote control and monitoring of the IMC electronics.

Here is the cables installed today just for a record :
       cable name       cable type

-------------------------------------------------------
- CAB_H1_ISC_8    DB9MF 5'  (L-com)
- CAB_H1_ISC_9    DB9MF 5'  (L-com)
- CAB_H1_ISC_11   DB9MF 6'  (L-com)
- CAB_H1_ISC_12   DB9MF 6'  (L-com)

- CAB_H1_ISC_4    DB15MF 5' (L-com)
- CAB_H1_ISC_46   DB15MF 5' (L-com)

- CAB_H1_ISC_10  DB25MF 5'  (RND)
- CAB_H1_ISC_13  DB25MF 5'  (RND)

Combining vented volume of new pump into rest of annulus volume did not change PT410B implying that BSC6's inner annulus O-rings don't leak (significantly)

After an IPC channel count we realised we had two spare channels which we could use for the IOP and user model watchdog transmission from SUS ITMY and ISI ITMY. This would allow unattended operation of BSC1 with an active ISI.

IOP: we modifed the iop models (h1iopsusb123 and h1iopseib1) to reinstall the Dolphin IPC (SUS sender, ISI receiver). We modified h1boot to only run the iop models, and shutdown all running models on h1susb123 and h1seib1. We then started the IOP models and verified that the output of the SUS was being received by the SEI. We manually panic'ed the SUS DACKILL and verified the SEI DACKILL was activated (all DACS were disabled).

User Models: Mark and Vincent made the appropriate user model changes to h1susitmy and h1isiitmy. These models were then restarted. Watchdog testing for these systems was handed over to Mark and Vincent.

We verified the safe.snap burt restore of both h1susitmy and h1isiitmy.

[Rodica, Giacomo]

Saturday morning we went trough the list of small optics needed for HAM2. Most of them were already good to go. We applied FC to a few others, and inspecteed and selected 4x 2" mirrors for the MC REFL periscope and 1x 2" mirror as ROM RH9 (these optics will potentially see high power). We still need to locate the half wave plate that goes after IM1. Note, however, that this waveplate is not needed to set the beam in the proper polarization to do a meaningful alignment through the farady isolator; in fact, we already have a temporary half wave plate in the PSL to rotate beam polarization BEFORE the IMC (to have a better beam visibility).

After lunch, we went into the chamber and checked the alignment of the Faray Isolator, as left yesterday by Cheryl. We found it good. We then rotated IM2 in yaw to relieve the elctronic offset. At present, IM2 has 0 offset and the alingment looks good.

We also tried to optimize the pitch alignment through the FI: although the needed offsets (on IM1 and IM2) will change as we clamp down the HAUX (we observed the change to be in the ~1000 counts range) with the proper clamp layout, it seem to us that having the beam at the right height at the input and output of the FI implies having it a bit too high (with the respect to the center of the optic) on IM2, and too low on IM3. This needs to be confirmed when we do the "final" alignment (after clamping down the HAUX). If needed, we can consider reducing the problem by acting on the blade adjuster of the HAUX, thus rising/lowering the optic as needed. It is positive that the needed adjustments seem to be small enough that a mechanical adjustment of the pitch is probably not needed.

We finally observed that the beam looked already centerd on IM4 (without need to adjust IM3) and temporarily used one of HAM2 baffles to block it after IM4.

In this configurations, the offsets are:

NOTE: as observed during alignment operation, the alignment sliders accessed by clicking on the the "Alignment Offsets" don't seem to have any effect. We'll investigate where the problem is, but for the moment just keep it in mind, and use the test filters offset instead.

Sunday we brought all the auxiliary optics chamber-side, removed FC, inspected and cleaned as needed. Same for the corrisponding balck glass. We then installed optics and black glass in their mounts and positioned them on the HAM table (the forks use the right holes on the table, and the optics are roughly in the right position, but tno alignment whatsoever was done). The optics that we installed on the table are:

ROM RH2
AROM RH2
ROM RH9
ROM RH1
AROM RH1
ROM RH3
ROM RH4
ROM RH6
ROM RH5
ROM RH11
ROM LH2
ROM LH1
AROM RH4

We did not install ROM RH12 (pick-off mirror for the parking beam) as we need to locate the special post. We also run into a problem with AROM RH4: we accidentally installed it in the post with the wrong orientation, and when we tried to remove it we stripped the peek screw head. We solved the problem by moving the picomotors to a new unactuated mount (need to check with Keita that this is fine) and installing a spare in it. The original optic is still stuck in the mount and we'll have to find a way rescueing it...

[Cheryl V., Giacomo C., Rodica M., Chris M.]

To summarize the work completed on the input optics installation this week: We placed the best 2 inch optics we have in the beam line leading to the mode cleaner. Using irises placed with cookie cutters we aligned the input beam into the IMC to MC2 and back from MC2 to MC3.  We then used MC1 and MC3 to get the cavity flashing (see video below) and subsequently checked the centering on the mirrors by eye.  Afterwards we used pushers and pitch adjusters (thank you Travis) to bring the electronic offsets to within 10% of their electronic range.  The HAM Auxs had their first contact removed, OSEMs centered, and damping engaged.  As of now the beam is aligned through the Faraday to IM3.  In addition, we have assembled the rigid optic mounts and many of the baffles.

The offsets on the IMC suspensions currently are



SUS
Pitch
Yaw


MC1
-840
-320


MC2
150
580


MC3
1120
190



The offsets on the HAM Auxs are


SUS
Pitch
Yaw


IM1
0
-700


IM2
0
2200

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot from approximately 6 PM Nov. 29 to 6 PM Nov. 30. Also attached are plots of the modes to show when they were running/acquiring data.

Exhaust flow through piping is sustaining a mechanical vibratory resonance -> Increased flow by adjusting regulator 1 turn CCW -> this increase flow stopped the vibrations but will result in a lower dewar vapor pressure which will cause the nominal %open of the LLCV to increase -> trial and error should produce a happy medium -> if not, then piping will have to be clamped differently 

Randy, Mick, Mark, Chris & Zack
Pretty Straight forward here.  Flew Support Table Over Chamber, lowered into cleanroom.  Hovered over the Support Tubes, bolted up, dropped load, torqued bolts.  Jacked Support Tubes up into V-Blocks and clamped tubes to blocks.  Removed Support Table.  Apollo crew will conclude the job this afternoon with a bit of hardware removal.
Nice work guys--H

Couple photos, Zack & Mick.

Jim, Hugo,

HAM3-ISI was re-balanced for testing to start over today. It is now locked for IO work.

We will unlock after lunch. Measurements will be launched at the end of the afternoon.

Note: IO still needs to add a beam dump next week. Balancing will be re-adjusted then.

Mark B.

As mentioned in comment 4804 below, I'm going to do a set of DTT TFs for ITMy M0 and R0, starting now.

- Chris, Giacomo, Rodica, Cheryl

IO:
Input beam to MC was aligned to the irises in front of MC1 and MC2.  MC1/3 were aligned to get the MC flashing.  Remaining two HAM Aux's had FC pulled and surface issues handled (left over FC and possibly others that Rodica can comment on).  The two HAM Aux'es that were moved for MC alignment were reinstalled using their alignment templates.

I put in an alog earlier today that lists the 2" optics that are installed in HAM2 in the IO periscope and steering mirrors AROM RH1 and ROM RH1.

HAM2:
The day began with Chris putting in most of the effort to vacuum and wipe  surfaces in HAM2.  Betsy and I found particulate on MC1's cage and throughout the chamber yesterday, and Rodica saw that the HAM Aux optics were populated with particulate pretty much as soon as FC was pulled.  I vacuumed MC3 and found particulate everywhere, both black and white flecks, and shinny (clearly metallic) flecks.  

We have two silicon wafers on the HAM2 table to monitor particulate.  It's not clear to me now, that particulate that lands on these is necessarily particulate added to the chamber, because it seems possible that it could be particulate that's already there and just being moved around.

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot from approximately 6 PM Nov. 28 to 6 PM Nov. 29. Also attached are plots of the modes to show when they were running/acquiring data.

List of 2"optics in HAM2 in the IO periscope and the steering mirrors to MC1:

M-38-UNP, SN-01, upper periscope mirror
- no defects on front face

M-38-UNP, SN-22, bottom periscope mirror
- no defects on front face

M-38-UNP, SN-65,
- looks good, effects on the back, but not the front
- installed as AROM RH1

M-38-UNP, SN-12
- defect 4mm from center
- installed as ROM RH1

During the quiet lunch hour Mark ran 3 of the 6 DOF TFs on the ITMy main chain.  The TFs indicated the ITMy looked healthy with resonance peaks in appropriate places.  At 4pm, Vincent reported that he could not run ISI measurements because he ITMy watchdog was tripped.  A quick investigation by Mark, Vicent, Hugh and I on DV indicates that indeed the ITMy seems rung up in Transverse (a motion only driven by the single side BOSEM).  As well, while we can enable the damping loops and watchdaogs such that signals wiggle out the far right of the ITMy MEDM, we aren't convinced damping is actually happening on the ITMy as seen by BOSEM channels on DV, and a quick noisy TF of longitudinal motion.  No mechanical work was undertaken on the ITMy today.  Possible culprits:

SEI work up top in the morning and afternoon could have jarred the ITMy into an EQ stop - will check in the morning, but doubtful as the BOSEM (sensors) postions look unchanged from the morning.

IOP work to remove BS which was hindering measurements, including frontend and model reboots/restarts to everything related to the IOP - Maybe we need a fresh reboot/restart? Will press on with troubleshooting tomorrow.