This morning, Giles, Travis, Mark, and Jason measured modes of the single pendulum monolithic: Bounce = 6.7 Hz Longitudinal/Transverse = 6.66 Hz Pitch = 1.1 Hz Yaw = 1.1 Hz All as expected. Roll and violin measurements to take place this afternoon.
Some photos of progress stuffing CDS racks, both in the H2 electronics building, and at EY. Plenty of cable trays mounted, too. i) nearly-complete (for entire diagonal) SUS electronics in racks in the e-building ii) DC power distribution racks in the e-building iii) SUS/SEI electronics, cabling and trays at EY
The M0 and R0 diagonalization measurements for the Yaw DoF were run today using the DTT templates"x1_susquad_M0_yaw_diag_111103.xml"and"x1_susquad_R0_yaw_diag_111103.xml", located in the SUS SVN in'~/SusSVN/sus/trunk/QUAD/X1/Common/dtt_templates/'. The first plot is of the M0 stage. The F1 OSEM is roughly ~20dB isolated from the Yaw DoF for the M0 stage. All other OSEMs are at least ~35dB isolated from Yaw. The Yaw excitation was a 1.353Hz sine wave with 250cts of amplitude. The second plot is of the R0 stage. OSEMs "F1" and "SD" are about ~25-30dB isolated from Yaw. The other two OSEMs are at least ~35dB isolated. The excitation was a 1.3Hz sine wave with 35cts of amplitude.
The"Load_MEDM_Values_X1.m"script to fill the X1 QUAD's matrix values, OSEM sensor gains, and turn on switches was run today to prepare the latest QUAD build for testing. The script can be found in the SUS SVN in'~/SusSVN/sus/trunk/QUAD/Common/MatlabTools'.The OSEMINF offsets for for the L1 and L2 stages were turned off manually. The outputs now oscillate about zero. M0 and R0 OSEMINF offsets are currently at 15,000cts such that the outputs now hover about zero. All OSEM input and output filters are on as well with gains of -1 for both input and output filters on both M0 and R0.
ICC continued in HAM-9. The detailed brushing (fins and hand-brushing around support tubes) work was completed this morning before the break for electrical safety training. After lunch, first vacuum was completed. We are ready to start wipe down in the morning.
Giles, Travis, Danny, Jason Today, after a few false starts*, the remaining 2 fibers were welded onto the ITMy After annealing, it was successfully hanging. The pitch error of the ITMy was found to be 2.17mRad up. The separation between the ITMy and PUM was measured to be 601.5mm (expecting 602mm). *2 fibers were removed as the first welds were poorly aligned.
Attached are plots of dust counts > .5 microns.
- EY: BSC6 H2 ETMY ISI craned on to test stand after cleaning by Kris and the crew.
- Many SUS visitors on site for fiber welding.
- Swagelok delivery for Hugh. Praxair delivery at 4:15pm at MY LN tank.
- TMS work ongoing at EY, CraigC and ChrisG assisting.
- PeterK, BennoW, and AEI/LZH group assisting with PSL installation
- Sam Waldman and squeezers continue investigating H1 OMC issues. Squeezers locked H1 this evening, LVEA in laser hazard.
- Two Control Room projectors need their bulbs replaced.
After a bit of a marathon afternoon/evening, Travis, aided by Danny and oversight by Giles, welded 2 of the 4 fibers on the monolithic suspension. Three fibers were actually welded on, but the first was removed due to a questionable brushing of the fiber. It was removed under the "when in doubt, pull it out" rule and the next 2 fiber welds commenced.
Attached are plots of dust counts > .5 microns.
Brushing began in HAM-9 and was ~95% complete by the end of the work day (which was a little early due to safety meeting). Only the fins remain to be brushed. There were a few problems with drills: three did not run for very long (less than 10 minutes) and then there was some difficulty getting a brush to detach from the chuck when a brush change was needed. The drills in question had been stored in N2.
The Test Stand and the Cleanroom was clean this morning--Thanks Terry & Christina We then promptly moved the clean room exposing the Test Stand (MTS) to receive the ISI. A few photos here will help: 1-The MTS is readied 2-Here it comes over the Cleanroom 3-Reverse Thrusters on 4-Touchdown The lifting gear was then unbolted and stored. Finally, the cleanroom was returned to the MTS and we secured the ISI to the Stand. Thanks Jim, Scott & Randy
Attached are plots of dust counts > .5 microns.
The test stand cleanroom was moved back into the VEA from the middle bay after the test stand re-build was completed. The work space and garbing/staging cleanrooms were moved into their nominal positions for the BSC-6 cartridge install. The test stand and work space cleanrooms are ready to be nested to clear the test stand for the ISI placement tomorrow.
Second vacuum, final inspection, and post-work FTIR sampling were completed in BSC-4 today. The crew got all the preparations completed to begin brushing in HAM-9 tomorrow.
Today, Travis, Giles, and Danny removed the remaining stock ends from the broken fibers on ITMY. Then, with Jason's help they finished setting the UIM, PUM, and ITMy (6each) DOFs appropriately in preparation for fiber welding. This included using the v-block refit with Doug's floating bearings. Other weld equipment was checked over and calibrated in prep (new tweezer tips, etc.). I used the DI N2 gun and the vacuum to do some further cleaning of the structure and the ITMy barrel. I had to dry wipe the top of the barrel mid vacuum to get particulate to come free from the surface. In the end, I think the vacuum with small OD PTFE hose lightly touching the barrel surface did the best job there. Numbers are being checked once more and we expect to be welding by tomorrow.
Attached are Giles' pictures of the breakoffs of the horns for re-welding. After some analysis of the horn-horn distances, he reports that "the scribing was very successful with all PUM welds looking good (and fairly similar within expected error of about 0.35mm). We just need to be aware of one weld on the ITM which broke 1.3mm too high and slightly above the scribe. This is easy to do with shortening the fibre."
The Seismic Test Stand (stormy) has been updated to RCG 2.3.1 New mbuf, daqd, nds, awgtpman installed. New IOP model installed with correct number of ADC/DAC parts to reflect actual installation. Test stand is currently running with only the IOP running, user models to be built and installed as needed.
Updated awgstream, gds tools, dataviewer to latest versions to match control room tools. Added utils package with filterfile, initcheck, and pdfmerge programs.
The high power laser (HPL) turned off at the weekend because the power watchdog was triggered. The system was running over a couple of day very stable, but on Saturday the output power started smoothly to decrease until the threshold for turning off the pump diodes was reached. The decrease was caused by setteling of the birefringence compensation lenses inside the oscillator as one can see by analyzing the signal at the DC channel of the photodiode downstream of the Brewster window (PDBP, misalignment of the birefringence compensation lenses corresponds to an increase of the voltage for this channel). This effect is already known from the LLO system and the reference system as well: A couple of days after delivery the components start to settle and need to be tuned. We realigned the corresponding lenses and and ended up with 185 W outside the laser box so far (205 W at the powermeter inside the expernal shutter). This is about 7 W less than we had directly after installation of the system and can potentially be improved.
