NOTE to Operators (and others)

With the EX Chamber work, there have been a pair of new Dust Monitors installed (along with new code, alog12738).  Unfortunately, the Dust Monitor signals aren't connected to alarms, and do not come up on the main EX Dust Monitor Screens.  You can find out counts on these Dust Monitors by bringing up their Expert Screens.  So, we will want to look at these screens every  now and then. 

The Dust Monitors work locally, so those doing in-chamber work should be mindful of any audible alarms (if any) the Dust Monitors may give.

Travis, Betsy

In prep for the PSL alignment check off of ITMy, we pulled the First Contact sheet from the CP-AR surface.

Since IAS finished taking this morning's alignment measurements, Travis and I went into BSC1 and dropped the dam that was standing between BSC1 and BSC2.  It is currently laying under the ITMy QUAD in the chamber in the event we need it again soon.

• X axis: -1.1 mm (south)
  • Tolerance: ±1.0 mm
• Y axis: -0.4 mm (east)
  • Tolerance: ±3.0 mm
• Z axis: +0.8 mm (high)
  • Tolerance: ±1.0 mm
• Pitch: 20 µrad down
  • Tolerance: ±50 µrad
• Yaw: 52 µrad CW
  • Tolerance: ±50 µrad

It should be noted that the pitch is without the 352 µrad correction for the First Contact currently on the HR face of the ITMy; this will have to be corrected for after the output arm work, in addition to the yaw and the X axis position.  Also, I applied a +40 yaw bias to the ITMy.  This zeros the yaw in our alignment equipment (the current slider calibration is a little off).

J. Kissel

In prep for the RCG 2.9 upgrade of EY, I've captured all relevant safe.snaps:
/opt/rtcds/userapps/release/sus/h1/models/h1susetmy_safe.snap
/opt/rtcds/userapps/release/sus/h1/models/h1sustmsy_safe.snap
/opt/rtcds/userapps/release/sus/h1/models/h1isietmy_safe.snap
/opt/rtcds/userapps/release/sus/h1/models/h1hpietmy_safe.snap

and committed them to the userapps repository. 

All components listed above have been left in their offline state.

• SR CHECKOUT (beam reflected off ITM, back through BS, and then through OFI & SRs):  ITMx COMPLETED yesterday.  ITMy is next and will work on getting there today.
• SR3 OSEM work this morning (Jeff/Andres)
• Laser HAZARD in ENTIRE LVEA when Jeff/Andres are done at HAM5
• EX:  vented, crew cleaning, give time for dust to settle, west door removal
• EX ISC:  check alignment, disable hepi/lock isi, fix pitch by moving masses, start QPD work
• EX PCal:  Alignment check, window work
• EY:  deionizer work begins (Rai)
• EY cabling/software work
• MAINTENANCE:  RCG-2.9 Channel Monitoring upgrade at EY
• MAINTENANCE:  Move autoburt to new server (cyrus)
• MAINTENANCE:  EX dust monitor work (Jim)
• MAINTENANCE:  EY test channel monitoring after RCG upgrade. Will restart SUS, ISI, & HEPI models
• MAINTENANCE:  cp2 liquid nitrogen
• DetChar F2F today/tomorrow
• BUSINESS:  If you received an email from Stella at Caltech be sure to respond promptly!

no restarts reported.

J. Kissel, D. Hoak, A. Pele, G. Merano

Spearheaded by my blind hopes of obtaining measurements of all 6 resonant modes of the suspended bench of the H1 SUS OFI -- an otherwise abandoned suspension, to confirm / refine the recently developed OFIS model -- Arnaud, Dan and Gerardo helped me construct various configurations of a (clean) laser pointer (literally a laser pointer) and an old QPD as a crude shadow sensor / optical lever. The normalized amplitude spectral densities are attached. I was able to confirm the two of the three modes already measured (Long and Vert -- see LHO aLOG 12588), but the only new mode I could get (without hours more pain, and MUCH better equipment / hardware) was the Yaw mode (which did at least roughly agree with the 1.1 [Hz] yaw mode from the model as it currently stands). Unfortunately, as we've learned from every other suspension, the Pitch and Roll modes are those which constrain the model the best. I did not reconfirm the mode's Qs. 

Ah well. Details and pictures below.

The lack of mode frequency and Q should not hold up close-out of this chamber, but as a last ditch effort, we should at least try to get this information from 3IFO's OFI.

-----------
Details:
Measured Resonances:
L* - 0.6306 or 0.6263 [Hz] (15 [mHz] or 7 [mHz] bin width, Configuration 2 & 1, respectively)
V  - ~1.05 [Hz]  (7.5 [mHz] b.w., Config. 3, noisy and low-Q)  
Y  - 1.058 or 1.084 [Hz]  (15 [mHz]  b.w., and Config 2 or 3, respectively) 
* the L and T mode are virtually degenerate and given the spew of light and iffy spot on the QPD, this could be either.

See attached images for configuration descriptions. I was pretty limited given the clean hardware and table space I had as to how and where I could reflect or shadow light. Very few of the surfaces at the beam / QPD heights I had were reflective, and there were only a few bolt-holts that allowed for a good beam-to-QPD path. Not to mention the quality of the beam coming out of the laser pointer was garbage, the QPD only read out one DOF (the X channel was reported twice out of the preamp #facepalm), and ambient motion was just barely enough to get the first three modes above the noise floor of the QPD at its maximum gain setting (used in config 2 and 3). If this ever needs measuring again (say if the 25 [Hz] modes appear in DARM from some second-order dirt effect) we should really think about the measurement technique.
 
Thanks again to Gerardo, Dan, and Arnaud for their help!

Hugh R, Jess M 

As of  00:53:00 UTC July 15, the ETMY chamber was in the following configuration: 

• HEPI in robust_isolated 
• Stage 1 in level 2 isolation: gain of 0.8 in Y, gain of 0.6 in X, TBetter on all DOFs except TCrappy on RZ 
• Stage 2 in level 2 isolation: gain of 0.5 on all DOFs, Start blend on all DOFs 

Please leave ETMY in level 2 isolation until 8am tomorrow (if it hasn't tripped by then)

Today Hugh and I spent the afternoon trying to get EMTY stably into level 2 isolation. For stage 1, Hugh brought up the DOFs one by one, and we discovered a giant peak in the actuator output signal (and the L4Cs) in all DOFs at 738Hz as the X DOF gain approached 1. (Giant = most of the actuator power spikes at that high frequency right before the ST1 actuators trips.) We're not sure what might cause this, but it's very reproducible and we plan to look into it later this week. 

We noticed a small peak in the open loop transfer function at about the same frequency, and the level 2 isolation filter gain is much higher than levels 1 or 3 in this very high frequency range.  (See attached.) 

As for stage 2, we had no trouble using the control script to bring it up to level 2 with the Start blend, but sometimes it would trip on the actuators shortly after and we couldn't switch the blend for any DOF without tripping (also on the actuators). 

On Sunday ~1957utc, the VFD on the HEPI Pump Controller at ETMY registered an overvoltage error (OV3) and shut down its output.  The servo was fine, the fluid level was fine.  This OV3 error has occurred before at various pump stations but not too frequently, a few times a year maybe.  No issues getting it back on using the documented procedure.

Today, Travis and I worked on aligning the main chain of the ITMy QUAD to IAS tolerances.  We first tackled some coarse yaw, then used pushers to push the structure in the +x direction to fix a ~3mm error in the lateral position of the optic.  (Some of this error was due to misplacement the first time we set this QUAD on this ISI.)  We then continued on pitch and more yaw and have finished the day with the optic within tolerance in position and pointing.  We will start transfer functions to check for the suspension health, but will likely hand off to SR3 output alignment checks with the PSL beam before continuing on with this QUAD.  (We have not touched the reaction chain yet, other than to clamp it out of the way of the main chain.)

Checked the following cables for possible shorts. 


PRM TOP (Cable 10 air side) - Found short on Pin 13 to chamber ground. Andres inspected cabling and saw no obvious short. He removed aluminum foil cable tie on table and short disappeared. Could not reproduce short.

PRM RIGHT and SIDE (Cable 11 air side) - Did not find any short to chamber.

PRM Middle (Cable 31 air side) - Found short on Pin 13 to chamber ground. Traced in-vacuum cable to feedthru. Short appears when you move the cable going into the connector. Will need to repair or replace cable.

MC3 Middle  (Cable 25 air side) - Found short on Pin 13 to chamber ground. Andres inspected cabling and saw no obvious short. He removed aluminum foil cable tie on table and short disappeared. Could not reproduce short.

Filiberto C. / Andres R.

New preliminary dust monitor code is running to support Met One GT-521S dust monitors at EX. There are 2 monitors that are supported by the code, and it works better if they are not turned off or disconnected.  If they need to be moved, contact Jim Batch to make sure they get started and data continues to flow.

The following EPICS channels are available for monitor 1:
H0:PEM-EX_DUST_VEA1_300NM_PCF
H0:PEM-EX_DUST_VEA1_500NM_PCF
H0:PEM-EX_DUST_VEA1_300NM_RAW
H0:PEM-EX_DUST_VEA1_500NM_RAW
H0:PEM-EX_DUST_VEA1_ACTSAMPLETIME
H0:PEM-EX_DUST_VEA1_DATESTR
H0:PEM-EX_DUST_VEA1_TIMESTR
H0:PEM-EX_DUST_VEA1_UNIXTIME
H0:PEM-EX_DUST_VEA1_STATESTR

Monitor 2 has the same channels with VEA2.

Note that the sample time is programmed into the dust monitor at 20 seconds, with a hold time of 300 seconds.  These values are not changeable from the control room with the present software.  Also, these are two channel devices, and only count 300nm and 500nm particles.  

• 9:00 Nathan beginning laser work in Optics Lab----->Dick will work with Nathan after 4pm
• 9:05 Justin heading to both end stations
• 9:08 EX vent beginning (starting with closing GV20), around 10:30 getting ready to vent--->vented by 11:30
• 9:16 Removing SRM First Contact (Betsy)
• 9:20 Locking HAM4 HEPI (Hugh)
• 9:22 Film crew heading to LVEA (Dale)
• 9:30 EX Laser SAFE (Justin)
• 9:38 Unlocking ITMx & assist with other SUS work (Travis)
• 10:01 EY transitioned to Laser HAZARD (Justin)
• 10:50  Film crew heading to beer garden
• 10:50 LVEA partial Laser HAZARD (Justin)
• 10:55 SR Alignment check (Kissel)
• 11:01 ITMy IAS work (Jason)
• 12:04 EX Dust Monitor software work (Jim)
• 12:53 EY hepi work (Hugh)
• 1:20pm SR Alignment check completed--->will transition to LVEA laser SAFE
• 2:00 HAM2 ground loop checks (Filiberto/Andres)
• 2:09 PCal crew staging/touring EX
• 2:26 PEM Crew heading to EX to calibrate accelerometers
• 2:48 Inspecting HAM4/5 optics (Calum/Kate/Nicole)
• EX now has (2) Dust Monitors for the EX vent.  They are currently NOT connected to the Alarm Handler
• 3:31 Mode measurements of the OFI by Kissel begins
• 3:35 Crash phone rung.  Only received beeps.  No messages...went to dial tone after a 30sec of beeping.
• LVEA trasition to Laser SAFE in the afternoon

A. Pele, K. Izumi, J. Kissel

After unlocking ITMX and pulling the first contact from SRM, we wanted to re-check our report of finding the IFO beam going through the HAM5 OFI. I outline the process below, but in summary, we have found an alignment that again gets the beam through the OFI, but with the beam mis-centered in YAW at SRM with +200 [urad] YAW offset on SR2 ~16 [m] away. Below are the alignment deltas from what we had in DRMI, i.e. pre-vent. We can be comforted in that the alignment change of the input chains are all ~0.5 [mrad] in P and Y, and within the range of the alignment sliders. This gives us confidence that IAS values for the new ITMX are quite good, and we should have only to do a similar amount of effort to get the Y-ARM beam also to go through the OFI hole.

Attached are pictures from the morning's activity, as well as a cartoon drawing of how the alignment into the OFI changes between an SR2 Y offset of -800 [urad] (clipping on input) vs. -600 [urad] (centered). The coordinate system drawn to the left the cartoon is global IFO coordinates. Finally, a screenshot of the alignments for all SUS.

Alignment Deltas:

     Pre-vent [urad]             Now [urad]          Diff [urad]
        P       Y              P         Y         P         Y
MC1   +1254   -2366.0     +1254.0    -2366.0    (none)    (none)
MC3   -550.0  -2467.0      -550.0    -2557.0    (none)      -90.0
IM1      0.0  +1469.0         0.0    +3786.1    (none)    +2317.1
IM2  +4600.0  +2000.0    +35849.3    +5154.7   +31249.3   +3154.7
IM3  -1397.9  +1060.8    +14057.0    +5464.0   +15454.9   +4403.2
IM4  -2350.0  -3607.0    -30000.0    -9337.0   -27650.0   -5730.0
PR2   +434.7   -355.7         0.0    +1350.0     -434.7   +1705.7
PR3   -245.5   -250.9         0.0     +250.0      245.5    +500.9
BS    +180.6   -266.4      +750.0     -600.0      569.4    -333.6
ITMX   +38.7    -48.9         0.0        0.0      -38.7      48.9
While we've changed the IMs quite a bit in both pitch and yaw (presumably to account for the bypass beam), but downstream all optics (PR2, PR3, BS) have not changed more than 0.5 [urad] in pitch, and PR2 is the worst offender with ~2 [mrad] in yaw, with the rest also below 0.5 [mrad]. These changes (at least of the large optics) are well within the range of the core optics. The largest offsets on the IMs are taking up ~80% of the DAC range.

Alignment process this morning (again, after release of ITMX and removal of SRM First Contact): 

- Check beam at SR3. Looks like clipping
- Check beam at AS port, AR side, output side of BS, see clipping.
- Check beam centering on ITMX -- is mis-centered. Tweak alignment of PR3 to center on ITMX.
- Check beam at AS port, AR side, output side of BS -- clipping alleviated.
- Check beam through HAM4 between HWS baffles, no clipping.
- Check beam at SR3 -- clipping alleviated.
- Re-center beam on SR3 using BS.
- Re-center beam on SR2 using SR3, making sure of no clipping on SR2 scrapper baffle.
- Re-center beam on SRM using SR2, still no clipping.
- Confirm that beam no-longer goes through input of OFI with SRM centering, using SR2 offset of Y = -800 [urad] (P as shown in IFO Align screen).
- Move SR2 to Y = -600 [urad], find that beam goes through OFI hole, but is now miscentered on SRM. Should be walk-able / recoverable, but we'll wait for beam from Y ARM before we move anything.

Laser

• Laser is ON
• Watchdog is ACTIVE
• SYSSTAT shows a RED "LRA out of range"  (LRA = Long Range Actuator).  Peter King was notified.

PMC

• Locked 2days8hrs (should be days/weeks)
• Reflected power is 3.9W (which is 17% of the Transmitted [22.4W] Power)

FSS

• Locked 2days 8hrs (should be days/weeks)
• Trans PD is 1.04 V (should be atleast 0.9V)

ISS

• AOM Diffracted Power  = 6.3% (should be around 10%)
• Last Saturation Event was 2+ days ago

Restarted End-X weather station epics ioc. It died about 12:09 PDT today for reasons only slightly related to dust monitor work, when the Comtrol web page was accessed.