[Rick S., Volker Q.]
Yesterday we hooked up the "new" RF cables coming from outside the PSL enclosure to the EOM. Before connecting the following drive levels were measured using a 50 Ohm terminator and an oscilloscope.
9.10 MHz 2.72Vpp 24.08 MHz 3.10Vpp 45.50 MHz 2.78Vpp
We began construction of the h1seih16 system today. We powered down h1susauxh34 and its IOChassis (which is broken). We removed its upgraded One Stop card and install it into the h1seih16 IOChassis. We ran a new timing fiber optics cable from the PEM/PSL fanout to this chassis and connected DC power. We connected the One Stop cable from the IOChassis to the front end computer h1seih16 in the MSR. We checked the DHCP, hosts files and rtsystab to verify the front end would boot. We performed a first power-on of h1seih16. It is on the Dolphin network but no gliches were found on other front ends. The IOP model h1iopseih16 was built from a copy of h1iopseih34 and cut down because of the smaller size. All appeared well but on closer inspection we have a ADC channel hopping error.
We tried a variety of h1hpiham1 models from L1, but could not find consistency with the HEPI drawing referenced by the model. But this is moot at the moment until we can get the IOP model running without channel hopping errors. After Mode Cleaner work is completed we will reboot and investigate.
[Filiberto / Kiwamu]
This afternoon we spent a couple of hours to double-check which cables are missing and which had been installed. During the work we found that some of the cables around the remote rack C2 were a bit too short to reach the electronics. All of them need to be elongated by 20 cm at least. They are :
- CAB_H1:ISC_48
- CAB_H1:ISC_27
- CAB_H1:ISC_28
We tried pulling the first cable to drag out more of its length, but it is still too short.
Filiberto will give it another shot when he climbs the cable tray for installing some new cables.
Mark B. Starting TFs on MC1 and MC3 at 17:05.
Mark B. Checked at 06:35. MC1 was done: /ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/MC1/SAGM1/Data/2012-12-19-1040023911_H1SUSMC1_M1_0p01to50Hz_tf.mat L and T plots are pristine but V, R, P, and Y have major dropouts in centre section, so can't for sure say healthy. Will redo everything with DTT. MC3 was still running, reporting 167 minutes to go, i.e., about 09:00 am finish. Will probably let run while working on MC1 and then decide whether to redo with DTT.
Mark B. MC3 data also had dropouts: /ligo/home/controls/mark.barton/0sussvn/HSTS/H1/MC3/SAGM1/Data/2012-12-20-1040041998_H1SUSMC3_M1_0p01to50Hz_tf.mat Redid both MC1 and MC3 with DTT: /ligo/home/controls/mark.barton/0sussvn/HSTS/H1/MC1/SAGM1/Data/2012-12-20_0930_H1SUSMC1_M1_WhiteNoise_*_0p01to50Hz.xml /ligo/home/controls/mark.barton/0sussvn/HSTS/H1/MC3/SAGM1/Data/2012-12-20_1030_H1SUSMC3_M1_WhiteNoise_*_0p01to50Hz.xml Both look good to go.
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.
