J. Kissel, S. Dwyer, D. Sigg, J. Rollins, A. Pele, H. Radkins, D. Gustafson, F. Clara, C. Reed, J. Batch, D. Barker

So, maintenance day was awesome. In summary, we had two problems that took us 4 hours to identify:
(1) The h1sush2a IOP model's DAC enable bit had gone bad after Sheila's restart of the h1suspr3 model. This resulted in the mode cleaner misalignment, because alignment offsets were not getting out to the SUS. This has happened several times before, see for example LHO aLOGs 10375, or 8964.
(2) Some of the /opt/rtcds/lho/h1/ directory structure has disappeared for an as yet unknown reason. This resulted in the mode cleaner blowing up the FSS every time it tried to LOCK.

The story, in chronological order for the record:

- Kiwamu and I flip HXTS signs, store new safe snapshots, and leave with the IMC locked. (see LHO aLOG 10837)
- Sheila installs optical lever BLRMS into PR3 by restarting the h1suspr3 front end code, which is on h1sush2a computer. (see LHO aLOG 10837)
- Restarting the SUS front end model trips the HAM2-ISI watchdogs (but NOT HPI), because the ISI loses communication with the SUS.
- Found the IMC TRANS and REFL cameras appearing grayed out, appearing to be broken / not reporting real data
- Sent Fil out to check if the camera's analog path has been screwed up some how. Confirms OK.
- Fil launched Cyrus and had him reboot the camera server processes on the relevant cameras and there's no affect.
- Sheila, Arnaud, Hugh, and Daniel launch on the "has the alignment changed since we last had a good lock, and to what SEI trips does the change correspond" DataViewer trending game. Red herrings everywhere, Daniel finally identifies that the IMC is just misaligned. The cameras look bad because of some automatic exposure or gain or aperture were searching for light and found none.
- Jim restarts the DAQ (see LHO aLOG 10832)
- Jamie identifies the h1sush2a IOP model's DAC enable bit had gone bad, because of his previous experience with the problem. We all look at the h1sush2a's IOP CDS bit word (one bit in the middle of a bit word, that is un-intuitively related to MC1 and MC3), and find, sure enough, the bit is red.
- Talk to Jim who says the way to solve the problem is to kill all user front-end processes, and restart the IOP process, and restart all the user processes.
- Performing Jim's FIXIT works, and we can drive out of MC1 and MC3 (and the rest on h1sush2a, PRM and PR3) again.
- We used the guardian to bring each SUS back into the aligned state, and turned on the IMC guardian.
- The IMC aligns, but is constantly flashing, breaking the FSS lock constantly during attempts to lock.
- After bringing up all the front end processes, while the DAC enable problems disappeared, we were left with IPC errors in the CDS bit words for 3 of he 4 SUS.
- Looking to clear these errors because they're a suspect, we tried opening the GDS TP screens to hit the "Diag Reset" button, only to discover that MEDM throws and error when SUS GDS_TP screens are called, complaining they don't exist.
- Looking into the /opt/rtcds/lho/h1/medm/ folder, we find that *all* SUS, and several more automatically generated MEDM directories have disappeared.
- Launched Jim and Dave to investigate, continuing to explore why the IMC won't lock (see LHO aLOG 10850)
- Sheila and I toggle switches, BURT restore h1lscepics, h1ascimcepics, h1ecatc1plc2 to 2014-03-18 14:00 PT with no affect
- Sheila checks analog IMC error signal (demod phase) and cabling at ISC racks. Everything looks great.
- Jim, beginning to replace all of the missing MEDM files, begins systematically make-installing all missing models.
- When he gets to h1susmc2 BLAMO -- the IMC locks right up.
- Dick titles the aLOG.


As I said, still unclear why all of these files when missing, but some ~200 files were apparently *non-MEDM* files, and *some* of those files were essential for the IMC to lock. YAAAAAAAY MAINTENANCE DAY YAAAAAAAAY.

The investigation continues on why we lost files from /opt/rtcds continues, in the mean time, Jim has reinstalled all models with the missing files, and things appear functional, but we've test little else than the IMC.

A massive number of files were deleted from /opt/rtcds under mysterious circumstances this afternoon between 1:20 and 4:20 PM PDT.  We checked for intruders, and inquired about creative or rogue scripts, but found nothing.  The largest number of files were deleted from /opt/rtcds/lho/h1/medm.

To restore the medm files, make install was performed on the following models:

h1iopsusb123, h1susitmy, h1susbs, h1susitmx, h1susmc1, h1susmc3, h1susprm, h1suspr3, h1iopsush2b, h1susim, h1susmc2, h1suspr2, h1sussr2, h1sussr3, h1sussrm, h1susomc,
h1iopsusauxb123, h1susauxb123, h1iopsusauxh2, h1iopsusauxh34, h1iopsusauxh56, h1susauxh56, h1iopseib1, h1iopseib2, h1iopseib3, h1hpiitmx, h1iopseih16, h1hpiham6
h1isiham6, h1hpiham3, h1isiham2, h1isiham3, h1iopseih45, h1hpiham4, h1hpiham5, h1isiham5, h1ioppemmy, h1pemmy, h1ioppsl0, h1pslfss, h1pslpmc, h1psldbb, 
h1iopoaf0, h1peml0, h1tcscs, h1odcmaster, h1omc, h1iopasc0, h1ascimc, h1sushtts, h1ioppemmx, h1pemmx, h1iopsusey, h1iopsusex, h1iopseiey, h1hpietmy, h1isietmy,
h1isietmx, h1iopiscey, h1pemey, h1iscex, h1odcy, h1odcx, h1iopsusauxey, h1iopsusauxex, h1susauxex.

Additionally, h1susetmx required a make, make install to be performed because the h1susetmxepics directory was missing from the build, even though it had been built shortly after noon today.

The SITEMAP.adl file or symbolic link was missing from medm, so a symbolic link was created to the SITEMAP.adl file in userapps.  Links to other adl files were missing as well.

We do have a complete list of missing files and will evaluate which files should be restored from backup tapes tomorrow.

I was logged in to see why the system wasn't running, and the machine crashed.  It restarted and I burt restored all three pls (h1ecatx1plc, 2, and 3) to 14:00 today.

We are currently investigating a loss of files from the h1boot /opt/rtcds file system. It appears to have happened between 1pm and 4:20pm (when it was discovered). We are restoring the files both from tape backup and by reinstalling from model RCG install scripts. We are investigating the cause of the loss.

(Corey, Jax, Keita)

Continue with getting a GREEN beam onto the TMS table.  We had to make more position changes for the GREEN Top Periscope Mirrors (this required using longer screws for the top dog clamps [see photo]).  Then most of the time was spent pointing the beam onto TMS.  Once on the TMS, the beam was then pointed onto the QPDs first with a TMS Periscope mirror, but most of it was via ISCTEY mirrors by Jax.  We went through several iterations of tweaking to stay centered on the mirrors and to also have a beam nice & centered on the ISCTEY periscope mirrors (this involved some nap time in the chamber while Jax did all the work outside [see photo]).

Through this alignment work, we could see the retro-reflected beam off the ETM on the TMS Telescope Mirrors.  On the Secondary mirror the spot looks to be low and little off in yaw.  To fix the pitch, we will need to pitch the TMS "back" via the slider weights under the table.

Additionally, during this alignment work, the QPD servo was engaged & is operational!

We aligned the ALSY green beam to the TMSY, and confirmed that the QPD servo works.

Tomorrow we'll rebalance the TMSY to get the ALS beam retro-reflected off of the ETMY.

Filiberto & Jeff

  The Apollo crew spotted a frayed nylon tag line in the cable tray over HAM5 (good catch Apollo). This tag line has been removed from over the HAM5 chamber, and will be replaced before any more cable pulling is done in this area.  

This afternoon, while adjusting the AOSEMs on the H1-SR3 Intermediate Mass, the UL Magnet/Dumbbell assembly was knocked off by making contact with the ceramic boards holding the PD/LED. We will reattach a new Magnet/Dumbbell assembly tomorrow. 

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.

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.

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.