Rick, Michael R
We have shut down the PSL after discovering the diode chiller flow had dropped from 22 lpm to 13 lpm over the weekend. This appears to be caused by a collapsed water filter (photo is attached). The current filters in use are 1 micron, but we plan on swapping them out with 5 micron filters this week.
Lots of prep work so that the optic can go back into the chamber. Work permits have been signed for staging and cleaning at BSC8 and for the venting of YBM. Below please find a checklist of items that need to be completed prior to entry, (ETA) and whose responsible for those items. I'll *note items as they get completed. -Garbing/staging cleanroom moved into place on west side of chamber cleanroom (*Completed 09 April 2012) Apollo-Dodson -Engine hoist located and moved into position (*Completed 09 April 2012) Apollo-Dodson -Locate BSC arm parts and stage (*Completed 09 April 2012) Apollo-Dodson, CIT-Buckland and Anderson -Locate and move garbing/staging cleanroom contents into position. (*Completed 09 April 2012) Apollo-Dodson and me -Vent BSC8 (~09 April 2012) Gerardo -Stage special equipment (~09-10 April 2012) Travis -Box up ITMy lower structure (~09 April 2012) Travis and Gerardo -Cleanings (~10 April 2012) Terry and crew -Door removal (~10 April 2012) Apollo -Install BSC arm (~10 April 2012) Apollo, CIT-Buckland and Anderson -Crane lower stucture in storage container to chamberside (~10 April 2012) Apollo?
The doors were removed from the chamber and the support table was preserved clean for later use (if needed). The crew pulled off early.
The following list summarizes the latest phase of testing on the H2ETMY Quad. Diagonalization of TOP stage OSEMs: Alog #2448 Data: '~/sus/trunk/QUAD/H2/ETMY/SAGM0/Results/2012-03-14_H2SUSETMY_M0_Vert_Diagonalization_1000cts.pdf '~/sus/trunk/QUAD/H2/ETMY/SAGR0/Results/2012-03-14_H2SUSETMY_M0_Yaw_Diagonalization_25cts.pdf Lower stage OSEMs are aligned and centered - all four L1 stage OSEMs are fairly well-aligned, but two of the remaining L2 OSEMs need to be adjusted. The remaining two are within range, but about ~5000cts from the limits. Damping loop functionality - Damping loops close robustly, but performance has not been fine-tuned. The QUAD has gone several continuous nights with the damping loops closed and not triggering watchdogs. Closed loop transfer functions with damping enabled have been taken. Alog #2482 Latest top stage TFs: aLOG 2445 Data: - ~/sus/trunk/QUAD/H2/ETMY/SAGM0/Data/2012-03-14_H2SUSETMY_M0_0p01to50Hz_allDoFs_tf.mat - ~/sus/trunk/QUAD/H2/ETMY/SAGR0/Data/2012-03-15_H2SUSETMY_R0_0p01to50Hz_allDOFs_tf.mat Hammer tests of QUAD cage with vibration absorbers off + ISI unlocked: Data: ~/sus/trunk/QUAD/H2/ETMY/Common/VA_Testing/2012_03_26_h2etmy_hammer_test/
In-chamber cleaning at HAM2 was completed on Friday and the doors were returned to the chamber.
Attached are plots of dust counts > .5 microns. The dust monitor at location 15 in the LVEA (under the clean room over BSC8) was reading a sensor failure for some time today. It seems to have gone away for now. I have included a plot of the mode (H0:PEM-LVEA_DST15_MODE) to show when it was not valid.
HAM-ISI Unit #4 Phase I testing report is posted on the DCC. This temporary version is waiting for validation.
Reports regading the previous units tested/validated (Phase I) at LHO are also available:
We plugged in the in-vacuum ISC cables for TMS-Y this afternoon, following the schematic D1003085-v6. The two QPD cables (type D1000924) were connected to the top feed-thru connector of sub-flanges #1 and 2 on flange F2. The picomotor and beam diverter cables (type D1000223) were connected to the bottom feed-thru connectors on the same sub-flanges. The picomotor cable is on sub-flange #2, the beam diverter is on sub-flange #1. (Sub-flange #1 is on top, 2 and 3 are on the bottom, in flange F2. Sub-flange #3 is a blank at the moment, I think it's supposed to be the ESD feed-thru?) The cables were loosely coiled together with a cable-tie and the attachments at the feedthru are nicely strain-relieved. Then, we tested the picomotors and beam diverter. All the picomotors were heard to squeal when driven from the in-air side of the flange. The beam diverter moved when ~4V were applied across the coil. The reed switch that is not stuck was seen to change state. The reed switch that was known to be stuck is...still stuck. In the chamber, there are three SUS cables that are currently not connected to feed-throughs. Two are for the TMS SUS, and are intended for flange E3. The other is (I think) meant for flange F3. We left them unplugged since we didn't think we'd need to damp anything. When we looked at the in-air side of flange F2 there were two cables connected to the ISC feed-throughs. These cables were labeled H2-SUS-TMSY, so I think they're supposed to go to flange E3. We unplugged them and left them in the cable tray.
GregG, JimW Today Stage 1 Vibration absorbers were mostly installed. This required removing the Stage 1 doors and driving out some 1/2" dowels that were part of the pre-vibration-absorber design. The "buckets" were then added and filled with their viton pads and steel masses. Install couldn't be completed because some precision shims have gone MIA, so the lids are just held in place with screws, not tightened down. Hope to have the correct shims in hand soon. Stage 0-1 spring TMD's were also installed and cable routing to the racks was electronically verified, the only things missing are the cable isolation brackets and the routing of the sync cables between the CPS racks. All in all we are in good shape to float and rebalance whenever other subsystems are ready.
Found 10-5 torr*L/sec leak(s) at NW40 joint(s) at the exhaust of the MTP. This size of leak(s) ~10ft away from the the application of helium at the new CF joints was causing some confusing results -> Tightened NW40 clamps (they were nearly falling off!) and OK now Kyle, Gerardo Valved-in IP9*Valved-out MTP*Dumped GV10 and GV11 gate annulus volumes into aux. pump carts*Opened GV10 and GV11
I connected the air-side Capacitive Position Sensors Cables to the Feed thrus and installed the feedthru protectors. The protection shrouds aren't secured very tightly as I was unable to find usable tools and I expect leak checking will require their removal anyway. The cable is not strain relieved also for the second reason. A photo below for your pleasure.
35W beam
200W beam
Rick and I adjusted the pointing into the DBB mode cleaner. Our procedure is as follows:
With these changes we increased the light on the TPD from 7V to 9V. The power in the 10 and 01 modes was reduced to ~5mV. A modescan of before (msc-001) and after (msc-005) are attached.
We found some strange behavior on the PZTs. If we lock the mode cleaner and turn the auto-alignment on, the PZTs will be driven from their nominal (0 counts) position. If we switch to scan mode, freezing the PZTs in their new configuration, we find that the modescan actually looks worse - in particular the 01 mode increase by a factor of 10 (msc-004). This looks like it's only for the 200W beam however. 35W beam with PZTs zeroed (msc-006) and in their locked position (msc-007) modescans are attached.
Yesterday, Travis started unsecuring the ETMy suspension in prep to fully suspend it early next week. He also plugged in all of the in-chamber SUS cables to the appropriate feedthrus.
The SUS ETMY Coil Driver boxes (5) were initially powered off prior to entering the chamber. To confirm the cable connections via medms, the five SUS ETMY coil drivers were powered on for this confirmation. All of the OSEM channels for each cable were confirmed "alive" on the corresponding medms. The coil drivers are now powered OFF.
Attached are plots of dust counts > .5 microns. I have also included a plot of H0:PEM-LAB_DST1_MODE to show when I stopped the IOC for the OSB optics labs dust monitors to test new code. This stopped data collection for H0:PEM-LAB_DST1_5, H0:PEM-LAB_DST2_5 and H0:PEM-LAB_DST3_5.
Will continue tomorrow
HughR,JimW BSC6 stage 2 ballast was replaced today, as well as the viton padding. All cabling was fed below as well. Hugh plugged seismic in, and SUS is currently in progress. See our intrepid leader fine tune the position of one of the mass stacks in the attached image.
(Betsy, Travis) The ITMy has been hung in the main chain lower structure in a double configuration (TM and PUM hanging from a non-suspended UIM). IAS measured that with the UIM sitting level to within 0.1mm over it's length, the ITMy is hanging at 3.4 mRad down. Recall that we have introduced a metal PUM with wire clamps, a wire loop around the ITMy, and new wire prisms on the ITMy all of which contribute to this error. As well, the level measurement of the UIM has a larger error bar than we would like as there is little lever arm to gauge the level on. As well, there is not a trusted way to measure the pitch of the now all-metal PUM, so we do not know exactly which knob to turn to fix the 3.4 mRad pitch error. Because this error is well within our course mechanical adjustment range higher up in the full suspension, we are concluding to adjust it out once we are back inside BSC8, mated to the rest of the QUAD suspension. The height of the lower chain was also checked by IAS today. We are working on chewing on the numbers to verify that we have hung the ITMy at the correct height.
D. Cook, J. Oberling
Measured the center of mass separation of the ITMy and metal PUM this morning.
