EY Oplev pier disassembled (Thomas)

HEPI fluid work at EX (Hugh)

Craning Clean Room "skeleton" in preparation for move to EY (Apollo)

As-Built drawing check of racks at EX & EY (Dave, Jim)

TMS Assy work at EX (Andres, Cheryl, Jeff, Keita)

A couple of big tours of kids (with Dale)

[Kiwamu with a help from Christina@AEI remotely]

 Today I made some efforts to bring the ISS back on by following an instruction by Christina and made it sort of running --- the loop can be closed by the autolocker but the diffraction power seems bit too high and also the gain seems too low. Certainly the ISS needs further investigations.

• Reference signal
  • Initially I tried to set it to be 1/5 of the DC signal of PDA which was 8.5 V.
  • -1.7 V at the reference signal didn't work -- it unlocked the ISS loop because of a too big signal at OSCILLATION_MON_LP.
  • I empirically ended up with a reference of -1.62 V which seems giving us a stable lock.
  • However this gave me a big diffracted power of about 16 % and I guess this needs to be about 10 % according to the strip chart in the ISS medm screen.
• GAIN
  • Initially this was set at 7 dB.
  • I increased the gain by 6 dB but it seems that a higher gain induces an unknown oscillation at about 100 kHz. This was clearly visible at the outer loop PD output in an oscilloscope.
  • Toggling the noise eater didn't change the situation.
  • So the gain was set back to 7 dB.

Yesterday, after suffering severe brain damage via knocking the massive mechanical test stand numerous times with my head, I managed to connect the balance of the suspension wires between all stages of the ITMx QUAD while mounted to the ISI.  The QUAD is ready for coarse alignment which will take many days before assembling the OSEM control brackets and lacing cables.  Deepak has been helping us with this work, including getting the cable brackets mounted for upcoming testing.

The optical lever for ETMY that was used in the OAT and HIFO-Y has been de-installed and dis-assembled in preparation for the cartridge transfer from BSC6 to BSC10.  The leaner pylon will be placed in storage and an opposite-handed leaner will be used for the H1 optical lever configuration, but the transmitter pylon is transferable so it will stay at the EY until we re-install the H1 optical lever.

Late entry for Tues 6th Maintenance.

The Vacuum Controls VME system in the corner station mechanical room (h0vemr) was booted against the new Linux based vxworks boot server as a first test. The plan is to migrate all Vacuum VME sysems from the legacy Sun Solaris boot servers to the new server, at which point the Sun servers can be decommissioned. This will reduce the power and heat loading of the MSR, and remove reliance on an old RAID unit which is showing errors.

[Stefan, Jamie, Kiwamu]

 After a couple of small tweaks, the IMC came back to the point where it routinely locks.

Since there will be a couple of scheduled measurements tonight for HAM2/HAM3 HEPIs/ISIs/SUSs, we disabled the autolocker so as not to disturb the measurements and also not to drive the FSS crazily.

• Small Tweaks:
  • H1:SUS-MC2_M3_LOCK_L_GAIN was decreased from -600 to -300.
    • Since the LOCK filters had been changed to Livingston ones recently, the gain wasn't too high to have a cross over frequency of about 20 Hz.
    • Currenlty FM3 and FM9 are used for acquiring its lock. Once it grabs a fringe FM2, which is a boost, needs to be turned on.
  • H1:SUS-MC2_M2_LOCK_L_GAIN was set to be 0.2
    • This was somehow found to be zero.
    • Currently only FM4 is used.
    • During the acquisition GAIN is set to be zero and needs to be ramped up to 0.2 once it is in lock.
  • We checked the I and Q signals of the IMC length signal at the floor and made sure it hadn't changed.
    • It seems the same as that we had before (alog 7181) on the oscilloscope.
    • Therefore the WFS must be also the same as before.
  • We enabled MC1/2/3_M1/2/3_LOCK_P/Y_OUTPUT such that the WFSs can act on the top mass of the MC suspensions.
    • They were off for some reason and hence the WFSs wasn't properly working.
    • The WFS loops seem working fine.
  • We haven't do a characterization of the IMC lock loop after these little tweaks.
    • At some point the cross over frequencies need to be revisited.

TMS tele/table was released from the support bridge, stabilizer bars were detached, all on-table cables were installed, and then the entire structure was put on a scale using Genie lift with a TMS lift tooling.

It was measured 79.5kg. Nominally it should be 82 so we'll have to add some masses.

Then we wanted to balance the entire structure on a balance bridge tooling, we had the bridge itself but it turns out that we don't have a special bolt and a pin that provide pivot point for balancing, it seems like all units are still at LLO. We're stuck, so no mating to the SUS today.

Wrote an email to Matt Heinze, if he finds them we'll be back to business.

Attached are plots of dust counts requested from 4 PM August 5 to 4 PM August 6.

CP5 filled
Constantly high dust counts in all three OSB optics labs
Jim B. updated the control room CDS workstation GDS tools
09:06 Ace Portable Toilets on site
10:16 spike in dust counts at end Y, possibly coincident with Hugh R. flushing HEPI air lines
Hugh R. reported he could not control medm screens from end Y, had me update HEPI pump control settings from control room
10:21 - 10:30 Cyrus R. reconfiguring and rebooting the mechanical room vacuum VME crate, MR INST AIR went invalid for a short period
10:34 Paradise water delivery
11:13 Hugo P. updating HAM ISI master model
11:49 Hugo P. restarting HAM ISI models, DAQ restarted

(Josh Smith, Stefan Ballmer)

We estimated the IMC transmitted frequency noise due to the PSL intensity noise. The intensity noise explains the IMC frequency noise below 80Hz (the light discrepancy is likely due to me using ISS data from today). Interestingly, this noise also explains the HIFO-Y green readout noise between ~6Hz and ~50Hz (alog entry 7216).

At the time of data taking (7/25/2013, 06:23:53 UTC) the ISS was off, i.e. the MC RIN was high (plot 2).

Conversion:

IMC_trans_freq_noise = f0/L*PWR*(2+1+1)/c/mMC2/(2*pi*f)^2 * RIN

where
f0=2.818e14 Hz (red frequency)
L=16.4736 m    (IMC length, one way)
PWR=164 Watt   (Power in the IMC, = 1 Watt * Finesse/pi, Finesse=516)
mMC2=2.9kg     (Mass of MC2 mirror, same as for MC1 and MC2)
(2+1+1)        (effect of MC2 at 0deg, MC1 at 45deg, MC3 at 45deg)
f              (Audio frequency)

I installed the latest {master model/Medm/scripts} update from Stanford, on the HAM-ISIs (Details, ECR E1300548) 

This new version features the replacement of local biases with Cartesian Biases for the ISIs.  Doing so allows removing the DC value of the CPS readouts of the error signal (biases use) while still keeping information regarding the platform position, and alignment, in the cartesian basis (which we could not do with the local biases).

Master models, MEDM screens and scripts were updated for the HAM-ISI. Every H1 HAM-ISI model was recomplied and restarted. 

Safe.snap files were updated for HAM2 and HAM3 so the local biases are left off when the model is restarted. Snap files are commited under the SVN (r5268)

the DAQ was restarted.

Everything work as expected. Isolation loops are turned back ON on both HAM2 and HAM3 ISIs. 

Details about svn updates can be found in the attached log.

Work was performed under WP4082, which is now closed.

Updates are ready for installation on BSC-ISI as well. 

We added fluid to the main line piping today and the fluid is flowing under servo control at 40psi.

I talked with Richard at Craftsman Flooring today. It appears from the file at Craftsman that we ordered enough material to cover the balance of the VEA floor around the chambers. Bubba knows where at least a partial roll of flooring is (Y-End by emergency exit). So I asked Craftsman to schedule flooring install ASAP, which will be next week. They will call me if they can get here sooner.

It seems that the ISS has been preventing the FSS from locking since yesterday (see alog 7340).

I turned off the ISS autolocker for the moment so that we can go ahead with the IMC locking which is one of the main activities recently.

For the linux-x86_64 workstation, the gds tools have been changed to branch gds-2.16.5 to be consistent with the LHO control room.

The gds tools have been updated to branch 2.16.5.  The gds tools include diag, diaggui, chndump, foton, awggui, ezcaread, ezcawrite, ezcaswitch, ezcademod, ezcaservo, ezcastep, and some other utilites.  Here's a list of more significant changes:

GUI programs (diaggui, foton, awggui):

Expand channel field width in fields and menus that display channel names.

Ability to generate .png files for plots (bugzilla 420)

Update to allow more than 128 tp and awg responses from front ends

Release notes viewable from Help menu (if installed)

For foton:

Modify to report in much better detail errors that are encountered when reading a filter file.  Errors reading a file are indicated by changing the File... button to a red color.  When mouse clicking the red File... button, errors are displayed in a popup dialog box.  (see image 1)
Use caution if the File... button is red.  This indicates that saving the filter file will most likely result in some (defective) filters not being saved.

Change matlab merge batch mode to not display any ROOT graphics.  Batch mode foton returns 0 for successful operation or -1 (255) for failure.  Errors will be written to stdout if any are encountered.

Filters with output ramp set with 0 ramp time will be converted to immediate switching with a warning issued to the user.

Foton preserves filters that consist of only gain(1).

For ezcademod, expanded the number of channels it can read to 200,000.  This is inadequate, and is a stop-gap measure which will have a more permanent fix implemented.

J. Kissel, H. Paris, A. Pele, B. Shapiro

After spending all afternoon getting all the chambers up into their best (local) performance, I've used Stefan's instructions to lock the Y ARM on Red. So easy -- even I could do it! Thanks to all of those who've written scripts to automate the ALS and IMC :-). Interestingly, and I forgot to ask about it, but there's no need to run any down script when the lock is lost. One just runs the two scripts again (assuming your Beam Splitter alignment remains good).

OK, I wrote the aLOG too soon. There have been several lock stretches, and the ISI-BS has tripped. I detailed time line is written below, for as long as I stayed here.

Here's the configuration of the SEI/SUS during these stretched:

Cavity Lock: 
Chamber    HEPI                                   ISI                               SUS
HAM1       Locked                                 n/a                               n/a
HAM2       Floating, Alignment Offsets Only       Level 2 Isolated                  MC1, MC3, PRM damped Level 1.5; PR3 damped Level 1.0
HAM3       Floating, Alignment Offsets Only       Level 2 Isolated (eLIGO Blends)   MC2, PR2 damped Level 1.5 
BS         Level 2 Isolated (Position Locked)     Level 3 Isolated*                 BS damped Level 2.0
ITMY       Locked                                 Level 3 Isolated                  ITMY damped Level 2.1
ETMY       Level 2 Isolated (Position Locked)     Level 3 Isolated                  ETMY damped Level 2.1, TMSY damped Level 2.0

* I noticed ISI-BS had tripped around 2:53 UTC, but it may have been down for some time. I didn't bother bringing it back up, 'cause I didn't want to blow the cavity lock. Or another three hours.

All Optical Levers are well centered.

All BSC-ISIs have been brought up to the configuration outlined in LHO aLOG 7226, but just for posterity, this means:
Level 3 Isolation Filters
Blends at ST1 "T250mHz" and ST2 "250mHz"
GND to ST1 STS2 Sensor Correction is ON (The corner station ISIs are both using the beer-garden STS2)
ST1 to ST2 T240 Sensor Correction is ON
ST0 to ST1 HEPI L4C Feed-Forward is ON (with "FF01_2" filters)
The Input Gains for the L4Cs and GS13s are OFF (I *think* this means they're in low -gain mode). They're ON for the T240s.

----------
Time Line (all times UTC, Jul 25 2013)
2:27 Locked on Red
2:46 Lost Red Lock
2:47 Regained Red Lock
    2:50 Glitch in CARM_IN1!
    2:53 Noticed ISI-BS had tripped. All other ISIs are still fully operational
    2:57 Glitch in CARM_IN1!
3:00 Lost Red Lock
3:06 Regained Red Lock
    3:11:23 Glitch in CARM_IN1! 
    3:24:47 Glitch in CARM_IN1!
3:27 We begin to ignore the IFO and go home, be cause there's enough data in the can to get a 0.01 [Hz] measurement in the past (assuming those glitches don't spoil the spectra)... but may the lock last through the night!

(Jeff, Kiwamu, Stefan)

With the H1:LSC-REFLAIR_A_RF9_I calibrated in Hz, and the open loop transfer function measured, here is the noise it sees: Input Mode Cleaner transmitted frequency noise.
Also plotted is dark noise (shutter closed).

We do not know yet what the ugly noise ~1/f^3 noise is.