The west door of HAM 3 was installed and torqued. A total of 3 view ports were installed- PR2 video ZV-800-00-0099 on the east door- MC2 video ZV-800-00-0083 and ILLUMINATOR i LIGO 5.4' R011 and proctetive covers on all of the listed view ports.
Attached is a snapshot of the good starting point when we're under vacuum. Witness plates installed West side of HAM2 on stage-0.
6 L4-Cs were pulled from BSC 1 that didn't have their flanges pulled down metal to metal. I replaced the hardware and gaskets, purged them with Neon, and pulled the flanges down metal to metal. They were leak checked using the modified VBO A. All 6 passed, having lower leak rates than the 1e-9 leak rate limit. The 12/13/12 test shows a total pressure around the low e-7s torr while 12/11/12 shows a total pressure around the upper e-9 torr. I believe the difference was a small nick in the copper flange. The small jump in the Neon signal was most likely a combination of the larger air leak and doubly ionized Argon. The pods tested were: V155 V151 V39 H28 H142 H68
(Corey, Keita)
Continuing the work of building QPD Sleds for upcoming installations, Keita and I recently finished up the EX Transmon IR QPD Sled (we completed the Green Sled a couple of weeks ago; the overall Transmon document is T0900385).
Lisa B. roughly laid out the Sled during her last visit. We then used an IR laser/launcher for our light source and worked on setting up our lenses in a way such that our beam profile would be optimized for the QPDs (Desired beam profiles are posted in the Guoy Phase document T1000247). To measure our beam profiles we used the Mode Master PC; Nicolas Smith's "A La Mode" Matlab scripting was used to calculate & plot our Beam profile. (The matlab script used for this sled is attached to this entry.)
The toughest part is setting up the Mode Master, but once it is set up, it's fairly straightforward laying out the lenses for the Sled. Once the lenses were positioned & we had our desired beam profile, the rest of the Sled optics were laid out. The Mode Master results and Matlab Beam Profile plots are attached to this entry.
The QPDs were aligned by connecting them (via feedthrough) to a QPD LCD Readout Box, D1102092, (which powers the QPDs & has an LCD target on it). One thing with this Readout Box--make sure to have low enough laser power such that you don't saturate the Box at Low Gain (otherwise, you won't be able to center QPDs).
Wipes were draped over optical components, entire assy wrapped in foil & bagged, and is now stored in a plastic bin. This bin will be stored in the Optics Lab under our Optics Table until we are ready for installation. Keita will submit an a document about this Sled to the DCC separately.
Below are documentation notes for this Sled.
Optical Component Distances
For measurements below, the lenses are measured on the "backface" of their Lens Holder. The Mirrors & Beam Splitters are measured from their glass "front faces". Measurements were measured with a scale & all measurements are in mm.
Photographs
Several of photographs of the build for this Sled are attached to this entry, and ALL photographs are posted in ResourceSpace, here.
List Of Components Installed
This HAM1 WFS Sled was completed & bagged/stored back in Oct/Nov by Keita. I opened it up to document a few items (optical component distance, photos, & parts used). After noting everything I needed, the Sled was wrapped back up & stored in its plastic bin under the Optics Table in the Optics Lab. It will stay here until installation. Keita will submit an a document about this Sled to the DCC separately.
Optical Component Distances
For measurements below, the lenses are measured on the "backface" of their Lens Holder. The Mirrors & Beam Splitters are measured on their glass "front faces". All measurements in mm.
Photographs
An overall photo of this Sled layout is attached to this entry. All photos of this Sled are located in ResourceSpace, here.
List Of Components Installed
DCC document is this: T1200555
According to me, L1 to L2 was measured 198.5mm, not 198mm.
Transfer functions were measured on HAM2-ISI overnight. They show good concordance with their counterpart at LLO*.
Linearity test is clean and slopes are within requirements (variation from average <1.5%).
| Slope | Offset | Average slope |
Variation from average(%) |
|
| H1 | 1.82 | -3939.89 | 1.83 | -0.37 |
| H2 | 1.81 | -1903.29 | -1.05 | |
| H3 | 1.85 | -474.80 | 1.43 | |
| V1 | 1.34 | 1291.50 | 1.34 | -0.39 |
| V2 | 1.34 | 139.11 | -0.16 | |
| V3 | 1.35 | -993.25 | 0.55 |
All other tests are satisfiying.
SEI is comfortable closing up this chamber too.
Note: One should be careful not to touch the cables that make a loop from Stage-0 to Stage-1 when closing up.
* LLO measurements were taken with PR3 on.
Performed port scans on CDS, H1FE and H1AUX VLANS. Had problems scanning H1SLOW and ADMIN.
Relocated the cdsadmin machine from H2 building to MSR.
- Travis, Cheryl MC1 had significant bias settings in both pitch and yaw after aligning it to get the mode cleaner flashing. These were zeroed by moving the pitch adjustment mass, and tweaking the blade springs. OSEMS were recentered. MC3 OSEMS were recentered. This morning I'll get a good MC alignment while I have access in HAM2 if needed, and verify the health of the changes we made yesterday in regards to alignment.
Mark B. Starting TFs on MC2 and PR2.
Mark B. Checked at 7:30 am 12/19 - PR2 completed, apparently successfully, MC2 still chugging away happily but not quite done. Quiet around HAM3 appreciated.
Mark B. Undamped TFs for MC2 finished at 10:47. Damped TFs for MC2 were scheduled, but they aren't critical to the go/no-go so I aborted them. Analysis is underway and HAM3 is available for other uses in the meantime. Data so far: /ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/PR2/SAGM1/Data/2012-12-18-1039919876_H1SUSPR2_M1_0p01to50Hz_tf.mat (PR2 undamped) /ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/PR2/SAGM1/Data/2012-12-19-1039939277_H1SUSPR2_M1_0p01to50Hz_tf.mat (PR2 damped) /ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/MC2/SAGM1/Data/2012-12-19-1039958656_H1SUSMC2_M1_0p01to50Hz_tf.mat (MC2 undamped)
Mark B. Both plots have a dorop-out for L at the lowest frequency band, but that's not serious. PR2 looks good otherwise. MC2 has a Y peak in the L TF that should be there and likewise an L peak in the Y. Suspension should be checked for possible rubbing at the side of a mass.
Mark B., Betsy After some discussions we decided that to go with MC2 as-is, for several reasons. The ISI is now unlocked and one door is on, so a thorough inspection would be tricky. The peaks are not nearly as bad as most cases of rubbing, and could also be explained by slight mismatch in either the LF and RT sensors or the LF and RT actuators (which participate in both L and Y). Finally, although it's hard to see from the summary plot, the slightly suspicious peaks were also present in the old results from 4372, which we signed off on, and at least at that time they were well-suppressed by damping. Thus we gave Bubba the go-ahead to install the other door on HAM3.
- tumbleweed baler started at 8:00 am along X-arm. Baler was moved near the large access door for the LVEA, then to the front of the OSB by late afternoon.
- Unifirst change site mats.
- Ace port a potty drove in a drove out due to tumbleweeds.
- Apollo installated a couple of glass viewports on input tube.
- Removal of FC MC optics, see Betsy's entry below.
- Apollo is installing the East door on HAM03.
We ran a quick set of transfer functions on HAM3-ISI. We focused on the 500mHz to 5Hz frequency range. Results are a bit noisy due to a lack of averages, but they show good concordance with what we expected.
SEI-wise, doors can be closed on this chamber.
* Barring one more round of TFs.
Today, we finished locking nuts and tweeking OSEM centering on PR2 and MC2. The MC2 closeup task-list took a side trip as we had poor cable connection of the L2 external cable both at the satellite box and at the feedthru on the chamber at the other end. I called in the calvary who helped us hunt these joints. Meanwhile, I attempted to remove the FC from PR2. The AR sheet came off without a hitch. The IAS-compatible HR sheet tore in many places leaving only the ring of the sheet in my hand when I was done. The central portion of the sheet was too thin the pull so was torn in from numerous directions and would not lift off. I reapplied FC (using the red "nail polish" bottle) over the torn sheet, added a PEEK tab and waited an hour before pulling again. It came off. There are still a few wisps near the edge of the sheet which did not come off, but I left it alone for now. We won't use this optic until after the next vent so we'll revisit cleanup then.
Travis and Cheryl also spent some time adjusting mechanical pitch on MC1 to reduce the amount of electronic bias used. CHeryl will re-check MC flashes in the morning.
[Volker / Kiwamu]
This morning I went in the PSL room with an escort of Volker to replace a PD in one of the ALS paths. The PD (PDA100A) that had been in the ALS refcav transmission path [1] was replaced with a Thorlabs SM1PD1A as designed. The output DC current from the new PD was about 0.36 mA when the laser light is on the PD. Note that I used a standard Fluke digital multi-meter for reading out the photo current. So no DC bias was applied on the diode.
[1] LHO alog #4721
JimW, HugoP
The 200lbs mass stack used to account for the missing PR3 apreared to be causing unwated resonances around 113Hz. We could hear the bottom mass tilting against the optical table when being hit. We untorqued the stack and put a folded alluminium strip under its problematic corner. Everything is torqued down. We cannot hear the mass rocking anymore.
2 potentially rubbing cables were found on the North and South sides. They were adjusted.
HAM2-ISI is locked so suspensions can be adjusted in pitch. It will be unlocked to pursue testing afterwards.
(Corey, Keita)
My mode-matching lessons from master Jedi Kawabe continue with the building of the EX Green QPD Sled. This Sled is one of two on EACH Transmission Monitor Suspension (TMS); the other is an IR QPD Sled (to be assembled next). We actually built this Sled twice. After completing it the first time, Keita noticed, "this sled looks like EY. It's supposed to be a mirror image!" It was all a learning experience. So, we ended up re-building the sled (it went much quicker since we, in essence, already had an assembly dry run).
Once the Sled was completed, we draped wipes over all optical components, wrapped the entire assembly in foil, double-bagged it, and placed the entire thing in a large plastic bin for storage under our Optics Table in the Optics Lab (the HAM1WFS Sled is also stored here).
Keita has plots and data from our mode matching measurements and will post a more thorough document about our EX Green Sled work to the DCC.
Note: The "J-Clip" Black Glass Beam Dumps on our Steering Mirrors are tough to install. There's a screw on the mount which interferes with the J-Clip and makes installing/removing these parts tough.
I have uploaded all photos for this EX Green Sled on ResourceSpace, here.
Forgot to measure distance between optical components on this Sled, so it was opened up and these measurements were made.
For measurements below, the lenses are measured on the "backface" of their Lens Holder. The Mirrors & Beam Splitters are measured from their glass "front faces". The QPDs are measured from the QPD Housing plate (D1002110). Measurements were measured with a scale & all measurements are in mm.
