Mitchell, The two monolithic plates have been assembled and the 0-1 blade spring posts have been added. A cleaning in the granite table clean room has been set up. Apollo will be working with C&B tomorrow to wrap and deliver the optical tables which are next up for a helicoil makeover.
Maintanence: - Ace on site for portables - Update .Net4 on Windows Virtual Machine - PraxAir at EX - DAQ Restart - Sheila adding OpLev BLRMS to suspension models, prototype of ECR 1400155 - Cycle GV7 for craning - Crane cleanroom at HAM5 - Move TCS tables to position - Crane TCS cabinets - Jodi at MY for 3rd IFO - Karen at MY for cleaning - Gerardo and Dave O. in H2 PSL enclosure for OFI alignment, using laser. - Betsy and Travis in west bay - Andres and Jeff B at HAM4&5
ISC is working late(r than me) so I've got a pending HEPI measurement planned to start between 8 & 830 tonight. I need the payload untripped as well as the HEPI to allow this to work. JeffK has agreed to untripped all the necessary watchdogs. ISC--please let him (or his handoff) know when you are done. Or you could untrip the payload and HEPI when you are done for me. Thanks all--H
Part of pre-Y1 accumulation test preparations -> Y1-1 10" gate valve open now -> PT124B measuring BT pressure again, i.e. normal confifuration
Note,
We are prepping for BT accumulation measurements and therefore Kyle is mounting and commissioning an RGA at the Beam Tube pump port which houses PT124. Reference Work permit #4508.
Expect PT 124 to range from 1E-9 to 1 E-6 torr while this work takes place. For the actual accumulation the mid station gate valve will also be closed and PT 124 as well as PT243 will begin to rise. The accumulation period may be as long as 48 hours.
J. Kissel, S. Dwyer, K. Izumi As of LHO aLOG 10702, we'd identified that the sign convention for the lower two stage coil/magnet compensation of all HSTS and HLTS (i.e. the signs of the gains of the COILOUTF banks) had been wrong since basically forever, in that a +L request results in a -L. Today we've gone through each SUS, flipped the COILOUTF signs to obey convention, and compensated for the sign flip in all affected LSC loops (ASC loops are not affected, since we're only sending signals to the TOP mass at this point). We have since confirmed that the IMC re-locks and we've checked that PRMI stuff is OK by re-locking PRX. We have captured all new safe.snaps for all the SUS and the LSC model, and subsquently committed all snaps and changes to guardian to the svn repo. Change list: (1) Changed sign in all M2 and M3 COILOUTF banks for MC1, MC2, MC3 PRM, PR2, PR3 SRM, SR2, SR3 to the following WAS IS NOW UL - + LL + - UR + - LR - + (2) For IMC L, we changed the analog sign on the slow (MCL) path in the IMC common mode board, just before the signal enters the LSC ADC, to change the overall sign of the LSC requested signal, as well as the top mass, M1 stage, LOCK filter sign, since it had already obeyed convention WAS IS NOW H1:IMC-REFL_SERVO_SLOWPOL - + H1:SUS-MC2_M1_LOCK_L_GAIN + - (3) The IMC Guardian only touches the MC2 M1 LOCK L filter gain (to turn it on and off during lock acquisition), so we made sure that it sets the gain sign correctly. (4) For the PRC, we changed the overall sign of the PRC loop in the LSC-PRCL bank, and then changed the MICH2PRM output matrix sign (the MICH2BS element is not affected, since it already obeyed convention). WAS IS NOW H1:LSC-PRCL_GAIN - + H1:LSC-OUTPUT_MTRX_5_2 - + (5) We've modified the two Guardians responsible for PRX/PRY locking and 3f PRMI locking to make sure they set these gains correctly. /opt/rtcds/userapps/release/lsc/h1/guardian/lsclib/prxy/carrierlock.py (PRX /PRY locking guardian) /opt/rtcds/userapps/release/lsc/h1/guardian/lsclib/prmi/sidebandlock.py
E1100846-v3. Still an early version, and I'm missing 2 minor tests, so when TMS feels they can give me a couple hour block. Otherwise SEI is in good shape, there.
Sheila, Jeff, Jim
We have added OpLev BLRMS to the suspension models for suspensions that have opLevs, this change is described in ECR E1400155
This involved changes to h1susetmx h1susitmx (since these are not using the quad master right now) QUAD_MASTER BSFM_MASTER and HLTS_MASTER
There is also a new medm screen in sus/common/medm/SUS_CUST_OPLEV_BLRMS
I also added a link to this screen in the op Lev screens :SUS_CUST_QUAD_L3_OPLEV.adl SUS_CUST_HLTS_M3_OPLEV.adl and SUS_CUST_BSFM_M3_OPLEV.adl
All of these changes are now committed to the svn.
The models are running, and Jim has restarted the DAQ so the new channels are avaiable. We also checked using dtt and a spectrum that the values diplayed are accurate.
Restarted the DAQ to add h1pemmy model channels, and for suspension model changes. The h1broadcast0 computer was running slowly, with a heavy load average and memory swapping occurring constantly. Rebooted h1broadcast0. It currently has 12G of RAM, may need more.
The aLOG maintenance has been completed.
Changes:
Took VM snapshot, then installed all current updates available in WU on h0dust. Also installed the .NET 4.5.1 update and associated patches. Patch process took about an hour, two rounds of updates.
Work Permit 4509, update windows virtual machine for dust monitors
Done at 10:47 AM
As a reminder the aLOG is down for maintenance today starting at 12:15pm pacific. Please save your log entries as drafts or post them to the log book prior to this time, or they will be lost.
The maintenance is completed.
TMS Work (Corey, Jax, Keita, Margot)
Apollo roughly positioned the ISCT-EY Table (via floor markings).
Chamber Floor was first cleaned upon entry for work (did not do an exit floor wipe). Margot then entered the chamber to remove First Contact from inside surface of pair of TMS Viewports (then went out and removed First Contact off outer surfaces). She mentioned "finger prints" on the outside surface of one of the TMS viewports; Margot will document in the DCC.
By eye, we checked position of the table, we ended up pushing the table about 3" west. We then attached ducting between the chamber and the table. Then we went in to check our line of sight from the TMS Table to the Table Periscope. This required us to move the GREEN periscope an inch east, and also the top periscope mirror down 4-6". At this point the laser wasn't quite making it down the ductThis is about where we ended things last evening.
Dust Monitor Check Of Purge Air For BSC10 (Corey, John, Keita)
John whether there was dust coming from the purge air. So I, with handheld Dust Monitor in hand, crawled under the ACB, and took a few measurements from the Dust Monitor (which was running continuously). I took measurements at four spots above the input of the purge air. At the highest point, I had readings which would hover between 1500-2500 counts of 0.5um particles. At the lowest point (with sensor of Dust Monitor right at the input), the 0.5um counts could be kept at basically 0-counts (with flashes of a few hundred possibly. So, it would seem the purge air is relatively clean.
These 2 statements seem contradictory:
"At the highest point, I had readings which would hover between 1500-2500 counts of 0.5um particles. [At the lowest point ...] So, it would seem the purge air is relatively clean."
Maybe can John elaborate at where he thinks the high counts are "coming from" if not the purge? Is it just that the air is turbulent in chamber and stirring up the 1500-2500 counts already in the chamber?
Corey saw high background levels in the beam manifold but was able to drive the particle counts to zero by moving the detector close to the purge port at the floor of the beam manifold. I walked around the VEA sampling and found low levels throughout. Counts inside cleanrooms were close to or equal to zero except at the open BSC door. There was activity here as well as equipment staged. Corey was inside and Keita was outside at the BSC entrance. The overhead work platform reduces the effectiveness of the clean room in this location. Inside, the arm cavity baffle obstructs access to the beam manifold so any work in the beam manifold requires a person to laydown and slide under the baffle. This may very well abrade clothing. I recommend we establish a horzontal clean flow as we have while working in HAM chambers.
A reminder that the purge air can only provide 25--50 cfm of air flow into the chamber. In a 6 foot diameter tube (beam manifold) this translates to air velocities of only 0.6 to 1.2 feet per MINUTE. Think how far you walk in a minute.
My impression is we have a reservoir of particulate in the vacuum chamber from the series of operations which have taken place - for example there have been two cartridge installs and one removal. Also this cartridge is an early assembly - probably assembled prior to some of the "in process" cleaning steps we have adopted.
Yes, I should elaborate a little (was quickly entering alog during Morning Meeting). So we did measure counts while I was in BSC10. And seemed like we had steading counts in the several thousands [for 0.5um counts with continuous sampling]. When I took measurements along the Purge Air plume, I would get up to 2500 at the most at the top of the plume (6' high). As I went closer and closer down to the Purge air inlet, the counts started to drop. And it was zero right at the inlet.
So the picture looked as though we have a baseline of particles floating in the chamber. And in the turbulent air above the Purge Air inlet the counts waiver a bit, but counts decrease the closer you are to the inlet. So above the purge we have particles moving around more (vs further away from purge these particles are more "statically" floating...perhaps they are more on the floor when someone like me isn't shuffling them into the air).
Basically we have particles all over the surfaces in the chamber/tube. They may be gently floating around or resting on the floor. They get rustled around when we work in-chamber & also get blown around and away from the Purge Air inlet. We need to remove these particles...which I know is obvious and daunting.
We're going to coninue wiping these particles on the floor toward door, but not sure what that does. Hopefully, particles get attached to our wet wipes, but I wonder if particles just get pushed to the edge of the floor and then fall over the edge of the temporary floor and then rain down to the bottom of the chamber. Sad sad.
Are these raw or normalized counts?
After Travis had notified me of a problem on ETMy where the copper clamps on the ring heater were touching when it was moved into final position I went in chamber and made some adjustments to keep the upper and lower clamps separated. Decided to check if the same problem existed on ITMx and ITMy. Unfortunately, ITMy had part of its macor break while I was adjusting the copper clamps. ITMx had the glass former break sometime after it's installation onto the lower quad. Both lower ring heaters have been removed.
[ FYI ... There is a specially designed Ring Heater Segment Replacement Fixture (D1101253), which is to be used ANY time a segment needs to be removed from a QUAD, if a dummy mass or a TM is also on the QUAD ]
Note, the ITMx unit has already been stripped of it's lowest dummy mass in prep to load the new glass mass later this week. So, the ITMx unit had extremely easy access for this RH work and no fixturing was required.
It's worse than I originally thought. The glass former broke along with the macor on the ITMy lower ring heater.
Apparently, damage was done (also) to the very tip-end of the glass former when the adjustment was made (14-March) to the copper clamp plates of the lower RH segment (assembly D1001895-v8 SN-210) on the ITM-Y quad. This damage was not revealed until the lower segment was dis-assembled. Photos are attached.
Regarding the lower ITM-Y assembly issues, see the attached (PDF) package of images.
The following feedback (attached) has been received, as guidance, from SYS
Dave O and Stefan B We measured the round trip gouy phase of the PRC using the same phase-locked sub-carrier that we used to measure the PRC length. We scanned the sub-carrier offset frequency over a full spectral range of the PRC (2.6 MHz) from 68.4 MHz - 72.4 MHz. We then monitored the amplitude and phase of the beat- note as measured by Refl-Air-B diode. Two plots are shown. The first shows the full sweep. Three tracs are shown. The blue trace is the transfer function for the full beat-note signal scanned over a full PRC FSR. The other two show the traces, when half the photo-diode is blocked and the sub-carrier is locked on either side of the main carrier. Unfortunately the interferometer lost lock half-way through both of these scans. The broader bumps show the resonance of the TEM01 modes. The second plot is the same trace zoomed in around this area. From this plot we can determnine that TEM01 modes resonate at 375kHz +/- 10 kHz off the main resonance and hence the round trip guoy phase for the PRC is 52 +/- 3 degrees.
I did some comparison of these results with some predictions from a Finesse model of the PRMI, and also compared with the results of the beam size measurements reported here
I attach plots with the predicted PRX Gouy phases over ITMX substrate lens power and PR2-PR3 distance offset.
The left-most solid diagonal line is the line that comes from the beam size measurements, and the right-most solid diagonal line is the one coming from the Gouy phase measurements (with two dashed lines representing the error bars there). The blue line is the expected ITMX substrate lens power (f=230km, 1/f~4.35uD).
It would help to know if the PD was covered left-right or top-bottom to know if you measured Gouy phase in x or y direction, but for now I just considered both possibilities.
One possible explanation for the larger measured Gouy phase than expected from the beam size measurements is if PRX and PRY were not ideally matched when the measurement was made. If ITMY was not heated enough to match ITMX, the PRC has a kind of "average" Gouy phase that is larger than the PRX Gouy phase on its own.
The contours of equal Gouy phase over the two varied parameters is the same as the contours of equal beam size, so there is still no chance to distinguish between ITMX substrate lens and PR2-PR3 offset (or PR3 Rc).
I also placed two strip tools, the top one for at the microseism frequency, 30-100mHz, and one for the suspension resonance frequencies, 0.3-1Hz. on the monitor on the wall next to the PEM FOMs. I moved the Osem screen over to the other side of th control room. We can change around the settings on these plots to make them more usefull if it turns out they are too hard to read.