After Mark had calculated and loaded the offsets and gains, I entered the cleanroom and set the M1 stage BOSEMs to 50% OLV. We should be ready to run a set of TFs to check it's post-move health in preparation for glass install early next week. We'll continue to investigate the M3 UL issue thereafter. Status: suspended, covered, and ready for M1 level TFs.
Yesterday I spent the day rebuilding the HXTS prism gluing measurement apparatus in order to accomodate the HLTS sized optic. At the end of the day I finally glued the prism on. Today, Gerardo removed the fixturing and sees that the prism is 2mm out of spec in the pitch-direction. Ugh. The d-value direction (or distance up from the scribe line) has been corrected. Both of these dimension differences from the first round of gluing can be seen in the attached picture where the phantom footprint from the last glued on prism was. The new prism should line up with the phantom line on the left end of the prism, but should remain at the current horizontal position on the line. I estimate that this error would induce roughly ~40mRad of pitch error. Because this glue bond is still somewhat fresh (only an overnight room temp cure) and the position error is so large, Gerardo is placing the prism down into an acetone bath for the night to remove it.
Mulligan-again for tomorrow.
It is unfortunate that you cannot check any of the setup measurements once the prism is in the fixture and glued down. We *think* this happened because the measurement apparatus is not very good at staying alignment when traveling up and down (away from the optic) in order to adjust for focus. You focus on the scribe line on the optic during setup and then you must slide up to focus on the notches on the prism which are many mm of focus different. Likely this focal plane change has some sideshift (on the order of the 2mm error we now see). I'm not sure what a good fix for this is this. I'll try removing some of the brackets between the traveling bore-scope and the horizontally mounted height guage.
Playing with the measurement apparatus today, Gerardo and I discovered that the bore scope 1) wobbles up and down relative to g, and 2) runs downhill by ~3mm over a 300mm length due to the weight if itself hanging off the end of the horizontally mounted height guage (see pic attached). Both piggy-backed jacks have slop in this direction. I can remedy 2) via shimming the entire stack of joints, but I'm not likely to be able to improve 1) without rearranging the entire measurement motivation. Hopefully 2) was the larger contributor to Monday's error. The top portion of the apparatus is the same as what I used to glue prisms to MC2 and PR2, so we would have see some slop then as well, however since the optics were smaller, the travel (and subsequent shifting of load) must have been less noticeable.
Attached is the LLO gluing apparatus, shown with an HLTS optic. It also is stacked lab jacks.
[Mark B, Stuart A] Ref: WP#3588 PR2 is being used overnight, testing the functionality of automated testing scripts (TF's and Power Spectra), following the recent SUS infrastructure and CDS updates. The measurement status indicator will be ON, however, the Master Switch will remain OFF for the duration of the tests (i.e. no excitations will get though to the optic). I will update the log when the measurements are complete and damping loops are re-established.
Measurements on PR2 are complete. Master Switch remained OFF throughout the night. Master Switch engaged and Damping loops restored at 9:30am (CT), 7:30am (PT).
The alignment of the MC was checked with the IR beam from the PSL. The beam was well aligned through the 3 MC irises, and the MC was flashing. DavidT and I removed the iris in front of MC2, and installed it between MC3 and IM1. This allows IO to monitor MC alignment, and continue HAM2 alignment, all from HAM2, meaning that we have exited HAM3. However, we have about 30 minutes right now to check the alignment of the beam dumps behind MC2 with the IR beam something we were unable to do earlier today.
And now we are, as of 3:30 this afternoon. Hugo and Jim unlocked, rebalanced, and the table is floating.
Mark B. I took OL readings on PR3 (and calculated appropriate gains and offsets) after Travis installed OSEMs on PR3 and left them backed out. M1T1 26124.3 1.1483561 13062.15 M1T2 30353 0.98837018 15176.5 M1T3 28842.1 1.0401462 14421.05 M1LF 25990.7 1.154259 12995.35 M1RT 26134.2 1.1479211 13067.1 M1SD 28493.2 1.0528828 14246.6 M2UL 18073.3 1.6599072 9036.65 M2LL 20597.1 1.4565157 10298.55 M2UR 19602.2 1.5304405 9801.1 M2LR 17998.4 1.6668148 8999.2 M3UL -3.19153 -9399.8803 -1.595765 M3LL 23289.9 1.288112 11644.95 M3UR 24780.1 1.2106489 12390.05 M3LR 17455 1.7187052 8727.5 There's something wrong with M3UL (not fully backed out?), but I'll enter the remaining gains and offsets to the OSEMINF screen.
Mark B. I entered the above gains and offsets except that I used 1.000 and -15000 for M3UL. I then created a new h1suspr3_safe.snap file. I archived the old as h1suspr3_safe20121005.snap based on its modification date, and made a spare copy of today's new one as h1suspr3_safe20121204.snap.
Mark B., Travis Travis replugged the cable and M3UL came good. Its OL was M3UL 17553.2 1.7091 8776.6 I entered the gain and offset and redid the safe.snap file (spare copy as h1suspr3_safe20121205.snap).
Yesterday, frequent transmission errors were seen between the SUS-ITMY and ISI-ITMY models (6 errors per second once every 10 minutes). 150errors/s was authorized by the ISI model before tripping the ISI watchdogs. A similar issue is seen with the IOP models. However, transmission error are less frequent (6 times 1error/sec (on a 64K model) during a 15h period - cf attachment). Consequently, the measurements initiated last night didn't go through.
A red laser pointer was aligned to the irises in frony of MC1 and MC2. Beam dumps are in place. I need about 1 hour this morning to finish placing irises in HAM2 using HAM3.
Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot from approximately 6 PM Nov. 30 to 6 PM Dec 2. Also attached are plots of the modes to show when they were running/acquiring data.
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.
Ooops, by reverting to an earlier h1iopsusb123 model we undid my change covered by the original WP 3582 which took the Beam Splitter out of the trip logic. So after about 90 seconds the DACKILL was getting triggered due to the missing BS OSEM signals.
We shutdown h1susitmy, rebuilt and reinstalled h1iopsusb123 sans BS trigger, tested by waiting a couple of minutes with no trip, then restarted h1susitmy (manually safe.snapped to be extra safe).
We think now we have finished this change. We kept the SEI DACKILL triggers (DACs killed) because team ISI were shaking the stack manually out on BSC1.
[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:
| IM1 | IM2 | IM3 | IM4 | |
| Pit | 1000 | -1750 | 0 | 0 |
| Yaw | -700 | 0 | 0 | 0 |
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 |
| 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.
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.
Mark B. TFs taken, damping restored. Plots pending.
Mark B. Plots! There's a bit of noise in some traces, especially R and T for both chains, but overall it looks good enough to be getting on with.
