State of H1: locking DRMI1F but not able to get through Engage_DRMI_ASC - Sheila working on alignment by hand to get through this stage

Locking Struggles:

• excitation on PZTs was on - now off - no indication if effected locking
• small eathquake - locking impaired for about an hour
• PSL FSS has needed help to stop oscillating - turned loop on and off to recover - probably 5-8 times today
• alignment has been an issue all day
• first locking attemps got to DRMI but not ENGAGE ASC
• ran an alignment
• DRMI and PRMI had issues locking
• ran an alignment
• currently, Sheila is adjusting alignment by hand in DRMI to engage the DRMI ASC

Site Activities:

• Gerardo to Mids
• Kyle to Mids and Ends
• Dick to ECR
• Sheila to LVEA
• Mark to LVEA and ECR
• Bubba to all outbuildings
• Platt Electric here mid0day
• everyone is out of VEAs and LVEA

Changes made to the Ops overview medm screen include:

• Master Switch "OFF" on all BSC ISIs will also cause a "RED" condition. It was brought to my attention that this calculation hadn't been included in the previous edits.
• The x/y arm (normalized) power indicators have been removed as they served no relevant purpose. 

Please refer any other suggestions for changes to me regarding this screen.

RobertS suggested a look at the BS OpLevs for position drifting.  I would say there isn't a lot of drifting looking at three days--First Attachment.

But--HEPI moved BS Optic pitch 3 or 4 urads based on Optical Lever

The first attachment is a 3 days showing the BS HEPI work done yesterday 29495 based on the HEPI Catesian location monitors.  You can see that the HEPI Cartesian positionas are exactly the same as before the work but the YAW and moreso the Pitch are shifted immediately following the work on HEPI.  The second attachment zooms into 9 hours and OpLev change is pretty much immediate with the reisolation of the SEI.  I did a quick scan of a few months of this and see most of the time, the OpLev Pitch and Yaw don't change drastically after a de/re-isolation of HEPI.  So I think the amount of change seen here yesterday is not the norm.

On the third attachment we see the actual change with the local Sesnors.  For the four Horizontal sensors you can see that all shift about positive 4 - 500 counts.  These actuators face opposite directions so these shifts essentially cancel and no YAW or Translation should occur.  For the verticals, with different Actuator positions, it is hard to imagine not actually shifting the tilt of the table even with the same resolved cartesian position.  Certainly the platform strain (in the actuator psoitions) as quantified by the Pringles is different.  This is what we have though with AC couple pringle loops.  I recommend we study the isolation sequence and maybe we can achieve better repeatability.

It is hard to imagine how this can affect the Optic Pitch but...

In general; Varying levels of higher-than-normal humidity levels in the LASER room and the Osc box and the corresponding temp fluctuations in the xtals are all related to the ongoing chiller issues. The resulting tripping/shutdowns are also evident in these trends as well. The ongoing DB3 issue is addressed here.

System Updates:

- SEI

• yesterday BSC2 change - no issues last night, but suggested to see what it did last night
• today - possible ITMY HEPI change

- SUS, working, no update

- CDS/Electronics

• Richard:
  • no reports from last night
  • continuing to work on Fault Reports
• Jim:
  • fr0 and fr1 - new software yesterday, look stable, no diagnosis on data shifting
  • offsite access - engaged 8am-4pm - web page is being modified

I increased the chilled water set point at the corner station chiller to 40 degrees F. Up from 36 degrees F. 

Jenne, Stefan

- lowered CFSOF gain from 0.5 to 0.2. This avoids an instability due to gain peaking and possible radiation pressure feed-back at 2.15Hz.

- With that the coil driver switching was no longer an issue. In fact we reduced the ramp times all to 1 sec - it worked fine.

- We still keep dropping the sideband recycling gain and lost lock after  ~36min. THus we decided to do some loop gain tracking.

- We added a laser frequency modulation line at 900Hz, and demodulated it in REFL_9_I (blue - LSC-LOCKINM_1_DEMOD_4_I) and REFL_45_I (brown - LSC-LOCKINM_1_DEMOD_3_I in the attached plot).

- Additionally we suspected that the BS ASC controls are going wacko. So we but pitch and yaw dither lines on the BS, and demodulated everything.

- Attached are two plots (with different time axis) of the result during a 50W lock.

Remarks:

- The REFL45 gain INCREASED by more than a factor of 2! This is consistent with less 45 sideband going into the cavity, and thus more being available as reference in REFL.

- The AS36_A gains seem to reflect that - i.e. a slight gain drop due to less 45MHz being available.

- The AS36_B gains initally agree, but then go completely nuts:  AS36_B_Q_P (orange) keeps dropping, while AS36_B_Q_Y (red) turns around.

- Additionally, the AS36_B_Q_Y- Q dither demoduilation is growing significantly (not plotted). Not sure what to make of that. (the Q dither demodulation of all other signals remaind reasonable.)

Conclusion:

- We suspect that our lock losses might be due to the BS ASC signal becoming unsable. In addition, we have to carefully look at loop gains of all WFS that use 45MHz in REFL - their gain is expected to shoot way up.

- At lest for REFL ASC, it might be time to use the dynamic power normalization.

LEGEND for plot:

H1:LSC-LOCKIN_1_DEMOD_4_I_OUTPUT         LSC: laser frequency to REFL_9_I  (blue)
H1:LSC-POPAIR_B_RF18_I_NORM_MON          9MHz 2-f in PRC                           (green)
H1:LSC-LOCKIN_1_DEMOD_3_I_OUTPUT         LSC: laser frequency to REFL_45_I (brown)
H1:ASC-ADS_PIT4_DEMOD_I_OUTPUT           ASC: BS pit to AS36_A_Q_P           (cyan)
H1:ASC-ADS_PIT5_DEMOD_I_OUTPUT           ASC: BS pit to AS36_B_Q_P           (orange)
H1:ASC-ADS_YAW4_DEMOD_I_OUTPUT           ASC: BS yaw to AS36_A_Q_Y      (purple)
H1:ASC-ADS_YAW5_DEMOD_I_OUTPUT           ASC: BS yaw to AS36_B_Q_Y      (red)

Jenne, Stefan, Terra, Jamie and Sheila commissioning.

Peter and Jason finished work on the PSL at the beginning of the shift. Stefan started and I finished an initial alignment. Jenne and I had to change the fiber polarization in the MSR. We encountered issues with engaging the DRMI ASC loops again. This was mostly dealt with by stopping at LOCK_DRMI_1F and moving the optics to minimize the ASC error signals before engaging the control loops. The striptools for these are in /opt/rtcds/userapps/release/isc/h1/scripts. They are PITCH_ASC_ERROR_SIGNALS.stp and YAW_ASC_ERROR_SIGNALS.stp. There was a 300nm dust alarm in the PSL102 room. I trended the channel back and it appears to have happened a number of times before. I changed the ISI configuration from 'very windy' to 'windy'.

23:12 UTC Jenne to LVEA to measure noise of seismometer
23:18 UTC Jenne back

Jason and Peter done in PSL, Stefan starting initial alignment

23:52 UTC Jenne and I changed polarization in MSR
00:11 UTC Initial alignment done
01:55 UTC PSL102 300NM dust alarm warning
03:16 UTC Changed ISI configuration from 'very windy' to 'windy'

Friday I had improved by a factor of 2x or so the persistent air leak in the Vertex RGA by torquing the suspect "factory" flange between the analyzer and it's protective nipple.  This leak turned out to be only a small fraction of the total leak rate observed, i.e. there was more than one leak.  Today I again removed all of the heat tapes and aluminum foil to gain access to the CF joints for additional helium leak testing.  Note that all joints had been tested individually at various times prior to this most recent bake exercise as well as collectively via bagging the complete RGA assembly.  Again, the joints tested good today so I decided to do a "fire hose" test and upped the flow of helium to "audible" values.  John W. was physically present this time and his well documented aura was in full effect so we immediately found that the turbo vent valve was the culprit.  This is consistent with all of the previous observations as the Turbo vent valve had not been sprayed in earlier hunts, the reasoning being that it is an O-ring seal with a very small cross section and permeates to the point of being a nuisance when leak hunting (normally!).  Also, the rate at which is was leaking was just smaller than that which would show up on the foreline pressure gauge but just big enough for the portion that reverse flowed through the turbo stages could account for the value of observed leaking at the turbo inlet - Arrgghh!!!!! 

I took scans and decoupled the turbo and pump carts and shut all noise sources off.  

I'll make an entry tomorrow with the scan data.

No overfill required today as we had an LN2 delivery and I had to reduce the LLCV %open from 21% to 18%.  

~1635 - 1700 hrs. local -> I visually confirmed that CP3's exhaust line was frosted - dewar vapor pressure at 20 psi.  

Next overfill to be Friday, Sept. 9th.

State of H1:  PSL crew continue to work on plumbing - crystal chiller was filled in preparation for turning it back on

Additional Activities:

• Gerardo to LVEA - labeling - done
• Kyle to LVEA - vertex RGA work - done
• Kyle - Mid-Y - CP3 fill - ongoing, left around 4PM to do this

Sitewide:

• two loads of LN2 delivered
• Platt electric delivery
• pest control in LVEA and all out buildings

State of systems that might effect H1 locking:

• ISC_Lock guardian in DOWN
• IMC_Lock guardian in DOWN
• BRS at EX and EY set to "Not in use"
• IMC common mode board was worked on today in the EE shop and reinstalled, but not yet used for an IMC lock
• HEPI for BS chamber, BSC2, had alignment drive load reduced, with changes in ofther DOFs (alog 29495)

TJ, Jim

This afternoon TJ walked me through making a guardian node for the Compact BRS in the Biergarten. This BRS is only destined to be used for Newtonian Noise studies, but has been drifting a bit since install. Up to today, the monitoring system has been Krishna watching from off-site, then sending me an email when the PZTs go out of range, if I don't catch it before then. Now there is a guardian that monitors the PZT readouts and recenters them automatically.

This is not a critical node, so if CDS needs to kill the node for any reason, we can do that, but it's nice having BRS babysitting automated. I've added this node to the Guardian Overview, in the top right above the TCS nodes, but that screen is getting pretty busy. I've also added/commit the guardian code to the userapps/isi/h1/guardian repository.

The node has 3 states:

1. INIT which returns to RUN, 

2. RUN which monitors the outputs to the PZTs and

3. RECENTER, which ramps off the damping, then the outputs of the PZTs, clears the histories of the PZT CTRL filters, ramps the CTRL gains on, then restores the damping and returns to RUN.

During today’s maintenance, I looked into a couple of peaks in DARM that have been present in recent weeks, even though we have been at low sensitivity. The peak at 56.8 is from the EX HWS. We should power it on a separate 18V supply like EY, or remember to shut it off for the O2 run. The peak at 451.5 was associated with Kyle's RGA bake-out pumping by HAM4, but I think he completed that today, so the peak should go away.

Re-Installed Common Mode Servo Board S1102626 for use with the mode cleaner.  This is the unit that had problems when the filter board was installed 23 Aug.  This unit has the 200kHz filter installed.  
Took advantage of the PSL work to fix the first channel on the DeMod board.  This has been re-installed and the mode clean is again going through the first channel.

State of H1: PSL crew working on plumbing and flow sensors - taking lunch and will return to the PSL this afternoon

Maintenance Activities: 

• Karen LVEA cleaning
• Fil LVEA HAM2
• PeterK PSL plumbing
• Kyle LVEA multiple-visits-vertex
• JoeD LVEA Batteries eyewash maint
• Betsy ETMX-ETMY charge-measurements
• Ed LVEA HAM6
• Jim-Hugh LVEA BSC2-BS-offset
• Fil LVEA BSC4-cabling
• JeffB LVEA HAM6 cleanrooms
• Travis MY bins
• Alfredo EX camera
• Richard LVEA ISS board
• PeterK PSL plumbing
• Robert EX noise-hunt
• Jason PSL plumbing
• Joe LVEA maintenance
• Karen EY cleaning
• Chris EX maintenance
• Betsy, Travis LVEA parts
• Bubba, Betsy LVEA 3IFO
• Robert LVEA ...

Current Activitiy:

• no one in the LVEA, Mids, or Ends
•  
• 
   

I've collected the alignment changes in the IMC, the IMs (IM1-4), PRM, PR2, RM1, and RM2.

I've also included the senors that see the beams related to these optics, WFSA, WFSB, IM4 Trans, and ISS2 QPD.

WFSA and WFSB are plagued by a mirror in HAM2 that we believe is loose, because the signals ont he WFS jump when there's no indication of IMC mirrors jumping.  Because of this feature in the WFS signals, I subtracted out the jumps from the segments of drift, and combined the drift segments to get a total drift over O1.

I've highlighted two sets of numbers:

• red = greater than 100urad change in optic alignment, or a change greater than 0.5 normalized qpd units
• blue = greater than 50urad change in optic alignment (less than 100urad), or a change greater than 0.25 normalized qpd units (less than 0.5 qpd units)

I included RM1 and RM2 since they follow the change of the beam.

Most changed optics:

• IM3 yaw at -111urad
• PR2 yaw at -115urad