Kyle, Gerardo Preparation for Monday's vent -> Spun turbo up but shut it down shortly thereafter -> pirani card in gauge controller isn't working for some reason so now turbo safety valve won't close when foreline threshold is exceeded -> will swap cards tomorrow and get turbo going then
Locked the ISI so we (w/ Thomas) could do the HAM4 ISI Optical Table Optical Lever alignment. I left the ISI locked.
I had the EPICS gateway processes for the vacuum subnet* re-read their access security files to add a missing channel prefix to the whitelist. This is a zero downtime action. *h0ve-ws, h0ve-cds, h0ve-h1fe
While assessing the IMC alignment for SR work, we (Kissel, Kiwamu, me) noticed a significant amount of scattered light from the transmitted part of the PR3 OpLev beam. See photos. It looks to be a bit low of center on PR3 and is scattering off a nice shiny round aluminum piece in the MC REFL periscope directly behind PR3. Looking for advice on what to do about it.
I also noticed that last week when I was up there, and we noticed this at LLO also and unfortunately it seems that all the op lev mirrors appear to transmit some % of HeNe light (I wont go into details as to why), and after much round discussion when we were closing up at LLO (we discussed putting black glass behind every optic) it was decided to just leave as is at LLO. We dont seem to have run into any problems because of it.
Matt is referencing Bug-108.
*********************************************************** QUAD08 model fitting I ran the model fitting algorithm on QUAD08 to see if any more insight could be gleaned from the measured TFs towards what is causing the error in the 2nd pitch mode. The fitting algorithm is on the svn at: .../SusSVN/sus/trunk/QUAD/Common/MatlabTools/QuadModel_Fit/QuadPend_GaussNewton_fit_v3_X1QUAD08.m The results confirm what others have already seen, in that increasing dm or dn (the top mass wire flexure heights relative to the center of mass) makes the model match the measured pitch modes. Specifically, the model says that either +1.4 mm on dm or +1.7 mm on dn equivalently brings the model in line with the measurements. You can also trade offset between one and the other because these two parameters are degenerate in the model. I also changed h1 = 0 to h1 = 2 mm. h1 is a horizontal front-back shift in the center of mass for the UIM stage. Betsy and Arnaud observed that the pitch adjusters here are pushed far forwards. This parameter reproduces much of the vertical to pitch cross coupling seen the the vertical-vertical and pitch-pitch TFs. It does not influence the mode frequencies. I put a QUAD08-tuned model on the svn here: .../SusSVN/sus/trunk/QUAD/Common/MatlabTools/QuadModel_Production/quadopt_wireloop_QUAD08.m The physical cause of the increased pitch frequencies remains a mystery. Drooping top mass blades would do this, as would improperly seated wire clamps for the top most wires. Since the top mass blades have been replaced without altering the pitch modes, it is unlikely to be those. A 0.15 mm increase in the top wire diameter would also do this, but Arnaud and Betsy checked the wire with calipers and it is correct. *********************************************************** wireloop model updates In the process of doing this analysis, I updated the wireloop model on the svn, which was quite out of date. See: .../SusSVN/sus/trunk/QUAD/Common/MatlabTools/QuadModel_Production/quadopt_wireloop.m Based on the most recent drawings for the wireloop quad (all metal, wireloop under PUM) I updated * all mass and inertia values * 3 of 4 wire lengths: ln, l1, l2 (these were based mostly on previous work with Mark Barton on the fiber quad model updates) * transverse wire spacings: n3, n4, n5 * and the d values: d2, d3, and d4 The adjustments on the n parameters helped bring roll more in line. The pitch inertias helped pitch a bit as well. The other parameter corrections had little influence on the dynamics, but are at least more representative of the as-built system. This work also found an error in some of the assembly drawings where the PUM wire clamp was flipped upside down. This has now been corrected in the drawings. The clamps had been installed correctly. *********************************************************** The attachment shows a comparison of TFs of the original wireloop model, the new wireloop model, the QUAD08-tuned wireloop model, and the QUAD08 measured TFs.
Andres R. & Jeff B. The regluing of the LL magnet/standoff was successfully completed. The repair jig has been removed from HAM5 and the AOSEMs have been remounted. They have been gross aligned. The suspension EQ stops have been released. NOTE: Found several Top Mass EQ stops touching the mass, (these stops were not put on for the magnet repair). When I released these stops there was a visible jump movement of the top mass. We will see if this is a contributor to the SR3 pitch misalignment. Particle Counts Before Work: In cleanroom cover on: 0.3 = 0, 0.5 = 0, 1.0 = 0 In chamber cover on: 0.3 = 17, 0.5 = 10, 1.0 = 2 During work: In chamber cover off: 0.3 = 46, 0.5 = 27, 0 After work: In cleanroom cover on: 0.3 = 0, 0.5 = 0, 1.0 = 0 In chamber cover on: did not get
It may have been forgotten that last week I had locked up all three SR3 stages so that HWS work could proceed and we could investigate pitch problem. I locked from top down so I am surprised to hear about a"jump" when unlocking
Day's Activities:
Nathan will work past 4pm in the Optics Lab, but he will be with Dick G ("they will be done by 5").
I was informed this morning that the laser was off, as there was no infrared light showing up on the video cameras. Went to the diode room and saw that the crystal chiller was indicating a flow sensor error. The water level was about the same as it was previously, so there were no water leaks. I turned the crystal chiller on from the PSL Computer, the flow rates indicated were normal. Turned the laser back on, everything seems okay. I do not know what triggered the flow sensor error in the first place.
The WHAM5 HEPI was locked for the Septum pull 23 April-- believe it has been locked since that time.
The HEPI Position Sensors (IPS) have been real since 18 April and during these five days I managed to do TFs & other static test. As I say, these measurements tend to destress the system and shift the IPS readings but the Cartesian numbers tend to not change much as the local shift cancel out in the cartesian basis. Attached are the cartesian trends and I'll use these values to update the position loop's target. Remember these channels are calibrated in nano units so the locked drifts and shifts from initial zero are pretty small.
Updated the safe.snap to save these. The position loops have not been done yet so these can't turned on. So lots more matlab work and more safe.snaps to go.
Since the platforms are unlocked, closing the loops seems right. No issues with HEPI. The ISI drives seem a bit high for level 1 even though I zero'd out the position biases. THis could just be the purge air or neighboring floor activities.
HAM5 SR3: magnets found, osems to replace, lock up sus until HAM5 isi balanced. Most morning locking and BOSEM adjust
BSC3: rebalanced BSC3 & locked ISI for SUS (ACB swung back)
BSC1 (Travis): checked ESD cables (some issue), coarse PIT work complete & ready for IAS check, spool out & ready for IAS (will take ~day for set up), really want to determine if a HEPI translation will be needed, because this would be a major schedule hit
EX Vent Prep: Laser Hazard at EX, Sheila staged for QPD work, EX first cleaning complete (2nd cleaning Fri or Mon), Doors off on Tues, 1st week: ISC & PCal 2nd week
HAM4 TF: tripped last night, so will want to run 8hr TF (after Apollo noisy work): avoid noisy work near HAM4
Output Arm Oplevs: ready for HAM4/5 retroreflection
Viewport Inspection work brought up with chambers being closed soon.
Business:
please see attached. only unexpected h1fw0 restarts up to the time the solaris QFS box was power cycled.
[Thomas Greg Gerardo Arnaud]
Today we finished setting back the optical lever at ETMx, all went well, we just need to check for digital comp filters.
Pulled the covers away from the ISI table. Attempted to close position loops on HEPI but was not stable in horizontal, decided to leave it off. After I got the TFs started, I looked again and found the HP L4C blend filter off so this signal was getting through and I'll guess is the problem. Don't want to stop the TF so I'll check that tomorrow.
After turning on the HP (horizontal pringle) L4-C filter, the position loops work just fine.
Andres R. & Jeff B. We reglued the second magnet broken off the Intermediate Mass (the Lower Left). There were no problems encountered during the repair. We will remove the jig after 24 hours. If the bond is good, we will remount and align the BOSEMs and put the baffle (mover for access to the magnets) back into its position for ISI balance work. Both broken magnets were removed from the chamber. Particle Counts Before Work: Cleanroom Cover on: 0.3 = 0, 0.5 = 0, 1.0 = 0 In Chamber Cover on: 0.3 = 0, 0.5 = 0, 1.0 = 0 During work In chamber: 0.3 = 17, 0.5 = 10, 1.0 = 0 After Work: Cleanroom Cover on: 0.3 = 0, 0.5 = 0, 1.0 = 0 In Chamber Cover on: 03. =0, 0.5 = 0, 1.0 = 0
Andres R. & Jeff B. We reglued the UR magnet on the SR3 Intermediate Mass this morning. We will check the bond tomorrow. When all is well with the repair of the UR magnet, we will replace the LL magnet, which was also knocked off. Both missing magnets have been found and are not in or on the suspension. To use the magnet repair jig we had to remove the baffle located behind SR3. Its location was marked. The baffle will be returned to its installed position when the magnet repairs are completed.
HAM5 Particle Counts Before work: Outside Chamber Cover On 0.3 = 0, 0.5 = 0, 1.0 = 0 In Chamber Cover On 0.3 = 0, 0.5 = 0, 1.0 = 0 During Work: In Chamber Cover Off 0.3 = 140, 0.5 = 30, 1.0 = 30 After Work: Outside Chamber Cover On 0.3 = 0, 0.5 = 0, 1.0 = 0 In Chamber Cover On 0.3 = 0, 0.5 = 0, 1.0 = 0
Both broken magnets have been removed from the chamber.
