Since HAM5 will be in the cleanroom and likely HAM5 will be bumped almost as much as HAM6, locked up HAM5 HEPI as well.

Position, relative to normally isolated:

-7um X, +15 Y, +31 Z, -10urad RX, -0.1 RY, +3 RZ.  The ISI remains isolated.  If the operator finds  either HAM5 or HAM6 tripped, maybe best to just put it in DAMPED.  The Chamber Manager has been paused since the HEPI can't isolate, so, you'll have to use the ISI Manager to change the guardian state.

Results are that three proof masses are out of range - I've emailed Hugh to make aware.

Averaging Mass Centering channels for 10 [sec] ...


There are 3 T240 proof masses out of range ( > 0.3 [V] )!
ETMX T240 2 DOF X/U = -0.387 [V]
ETMX T240 2 DOF Y/V = -0.399 [V]
ITMY T240 3 DOF Z/W = -0.303 [V]


All other proof masses are within range ( < 0.3 [V] ):
ETMX T240 1 DOF X/U = 0.041 [V]
ETMX T240 1 DOF Y/V = 0.063 [V]
ETMX T240 1 DOF Z/W = 0.083 [V]
ETMX T240 2 DOF Z/W = -0.251 [V]
ETMX T240 3 DOF X/U = 0.063 [V]
ETMX T240 3 DOF Y/V = -0.13 [V]
ETMX T240 3 DOF Z/W = 0.027 [V]
ETMY T240 1 DOF X/U = 0.011 [V]
ETMY T240 1 DOF Y/V = -0.069 [V]
ETMY T240 1 DOF Z/W = -0.02 [V]
ETMY T240 2 DOF X/U = -0.192 [V]
ETMY T240 2 DOF Y/V = 0.011 [V]
ETMY T240 2 DOF Z/W = 0.123 [V]
ETMY T240 3 DOF X/U = -0.028 [V]
ETMY T240 3 DOF Y/V = -0.026 [V]
ETMY T240 3 DOF Z/W = 0.071 [V]
ITMX T240 1 DOF X/U = -0.197 [V]
ITMX T240 1 DOF Y/V = 0.24 [V]
ITMX T240 1 DOF Z/W = 0.186 [V]
ITMX T240 2 DOF X/U = 0.201 [V]
ITMX T240 2 DOF Y/V = 0.244 [V]
ITMX T240 2 DOF Z/W = 0.227 [V]
ITMX T240 3 DOF X/U = -0.091 [V]
ITMX T240 3 DOF Y/V = 0.186 [V]
ITMX T240 3 DOF Z/W = 0.212 [V]
ITMY T240 1 DOF X/U = 0.165 [V]
ITMY T240 1 DOF Y/V = 0.027 [V]
ITMY T240 1 DOF Z/W = 0.095 [V]
ITMY T240 2 DOF X/U = 0.166 [V]
ITMY T240 2 DOF Y/V = 0.259 [V]
ITMY T240 2 DOF Z/W = 0.184 [V]
ITMY T240 3 DOF X/U = 0.037 [V]
ITMY T240 3 DOF Y/V = 0.194 [V]
BS T240 1 DOF X/U = 0.033 [V]
BS T240 1 DOF Y/V = 0.049 [V]
BS T240 1 DOF Z/W = 0.178 [V]
BS T240 2 DOF X/U = 0.12 [V]
BS T240 2 DOF Y/V = 0.196 [V]
BS T240 2 DOF Z/W = 0.205 [V]
BS T240 3 DOF X/U = 0.089 [V]
BS T240 3 DOF Y/V = 0.074 [V]
BS T240 3 DOF Z/W = -0.026 [V]


Assessment complete.

This closes FAMIS task 4367.
 

Completed locking around 0615.  Ready to tolerate rambunctious activities.

Position is pretty good wrt nominal: +19um X, +15 Y, +38 Z, +5urad RX, -3 RY, & +7 RZ. Plenty level for ISI work.

...at 7:20 am local time. Pressure reads 1.2 psig.

If you'd like to move the table, you need to do the following:

• Mark the position of the table on the floor using plumb bob or straight edge and sharpie.
• Disconnect the cables. (Cable connections are already documented.)
• Drop the lexan covers in the viewport cover slots and remove the duct materials connecting the viewports and the table.

PT243 - 1.17 x 10-9 torr 
PT244 - 1.57 x 10-9 torr 
PT210 - 1.57 x 10-9 torr 

I know, I know :)

Related alogs 26264. 26245

I did some follow-up tests today to understand the behavior of the DARM cavity pole. I put an offset in some ASC error points to see how they affect the DARM cavity pole without changing the CO2 settings.

I conlude that the SRC1 ASC loop is nominally locked on a non-optimal point (when PSL is 2 W) and it can easily and drastically changes the cavity pole. The highest cavity pole I could get today was 362 +/- a few Hz by manually optimizing the SRC alignment.

[The tests]

This time I did not change the TCS CO2 settings at all. In order to make a fair comparison against the past TCS measurements (26264, 26245), I let the PSL stay at 2 W. The interferometer was fully locked with the DC readout, and the ASC loops were all engaged. The TCS settings are as follows, TCSX = 350 mW, TCSY = 100 mW. I put an offset in the error point of each of some ASC loops at a time. I did so for SRC1, SRC2, CSOFT, DSOFT and PRC1. Additionally, I have moved around IM3 and SR3 which were not under control of ASC. All the tests are for the PIT degrees of freedom and I did not do for the YAWs. During the tests, I had an excitation line on the ETMX suspension at 331.9 Hz with a notch in the DARM loop in order to monitor the cavity pole. Before any of the tests, the DARM cavity pole was confirmed to be at 338 Hz by running a Pcal swept sine measurement.

The results are summarized below:

• SRC1, offset = from +400 to -300 cnts, cavity pole = from 350 Hz to 275 Hz
• SRC2 , offset = from +0.2 to -0.2 cnts, no change
• DSOFT, offset = from -0.03 to 0.03 cnts, no change in cavity pole, but a noticeable drop in the power recycling gain (41 --> 39).
• CSOFT, offset = from -0.03 to 0.03 cnts, no change in cavity pole, but a noticeable drop in the power recycling gain (41 --> 38-ish).
• PRC1, offset = from -0.1 to 0.1 cnts, no change in cavity pole, but a noticeable drop in the power recycling gain (41 --> 38-ish).
• IM2, some large offset, no change in cavity pole.
• SR3, offset = +/- 50 urad, no change in cavity pole or recycling gain.

The QPD loops -- namely CSOFT, DSOFT, PRC1 and SRC2 loops -- showed almost no impact on the cavity pole. The SOFTs and PRC1 tended to quickly degrade the power recycling gain rather than the cavity pole. I then further investigated SRC1 as written below.

[Optimizing SRC alignment]

I then focused on SRC1 which controlled SRM using AS36. I switched off the SRC1 servo and started manually aligning it in order to maximize the cavity pole. By touching PIT and YAW by roughly 10 urads for both, I was able to reach a cavity pole of 362 Hz. As I aligned it by hand, I saw POP90 decreasing and POP18 increasing as expected -- these indicate a better alignment of SRC. However, strangely AS90 dropped a little bit by a few %. I don't know why. At the same time, I saw the fluctuation of POP90 became smaller on the StrioTool in the middle screen on control room's wall.

In order to double check the measured cavity pole from the excitation line, I ran another Pcal swept sine measurement. I confirmed that the DARM cavity pole was indeed at 362 Hz. The attached is the measured DARM sensing function with the loop suppression taken out. The unit of the magnitude is in [cnts @ DARM IN1 / meters]. I used liso to fit the measurement as usual using a weighted least square method. 

By the way, in order to keep the cavity pole at its highest during the swept sine measurements, I servoed SRM to the manually adjusted operating point by running a hacky dither loop using awg, lockin demodulators and ezcaservos. I have used POP90 as a sensor signal for them. The two loops seemingly had ugf of about 0.1 Hz according to 1/e settling time. A screenshot of the dither loop setting is attached.

[Evan, Jenne, JimW]

We turned the ITM pitch oplev damping back on, set some QPD offsets for POP and transmons, and were able to go to 20W without trouble.  We have finally made it to nominal low noise for the first time in weeks!  Hooray!  Sadly, a 2.84Hz oscillation killed us after about 10 seconds.  Work continues, but I was excited enough to write an alog.

1555 -1635 hrs. local -> To and from Y-mid 

Recent conditions -> 60F - 75F days, Dewar ~40% full vapor pressure 14 psi, LLCV 18% open 

[Executed nominal procedure as was practiced for 48 hour over-fill intervals] 

LN2 at exhaust after 32 min 30 seconds with LLCV bypass 1/2 turn open and exhaust check valve bypass open 

Next scheduled over-fill to be Monday, April 4th before 4pm local.  

NOTE: Need to revisit agreement between Dewar's local mechanical level gauge and value indicated by CDS.  Also, recommend adopting new default for LLCV bypass X turns open for new 72 hour over-fill interval (something more open than previous default of 1/2 turn open).  

We're looking at replacing the HWS code which is compiled in MATLAB (and quite incompatible with newer versions on Ubuntu) with a more streamlined, Python-based version. The test bed for this is H1HWSEY.

So far, we have tested the following:

• Dave has succesfully installed Ubuntu 14.04 and the EDT (frame grabber card) drivers on the machine
• Once the EY HWS is turned on, I can log into H1HWSEY, run serial_cmd and succesfully connect to the internal menu system of the camera
• Can acquire an image from the camera and save it to file with the take command
• Downloaded python_code from HWS_SVN into /home/controls to test the running to the Python code on this in-situ machine
  • Final installation directory of python code still needs to be established

Need to install EPICS/ PYEPICS ancd CDS tools.

State of H1: unlocked for 3.5 hours due to an earthquake

Activities since mid-day update:

• 19:30 Kyle started a pump cart by HAM4/5
• 20:46 ITMY Hardware Watchdog Tripping verbal alarm
• --- FYI: ITMY Hardware Watchdog is NOT hooked up to ITMY, but the sensor is live and reading a signal real-time
• --- when I opened the MEDM, the sensor was red and then went green again - NOT it's expected behavior, so Dave's looking into it
• 21:09 Ed to LVEA - vent prep, out at 21:18
• 21:09 Kyle - out of LVEA
• 21:10 Keita-Jenne to LVEA - checking HAM6 racks - 21:33 done
• 21:30 Hugh - updating ISI models
• 22:33 final checks before restarting the DAC - Dave, Hugh, JeffK - DAC restart successful
• 22:50 Kyle to MY, CP3 fill
• 22:50 PSL ISS Diffracted power was low - around 6% - raised to 8%
• 22:50 Jenne starting an Initail Alignment, to assess where H1 alignment is at after being down for 3 hours due to an earthquake

Currently Activity: Jenne is looking at the alignment

See the attached for an incorrect syntax and the correct way to direct the front end to save the channels in the Science Frames.

The asterisk placed after the desired science frame rate makes the rate interpreted incorrectly.  Since it did not know what to do with 1024*, it was storing the channel in the commissioning frames at 4096 and not at all in the science frames.  The asterisk on the channel name is the correct way to go.  The directions are all there, I just failed to look closely.  I should have learned the necessity of doing so after all these years.

The modification was to a library part so the edits at least were not extensive.  The change is committed:

hugh.radkins@opsws1:models 0$ svn commit -m "Corrected syntax error in frame storage"
Sending        models/ISI_to_SUS_library.mdl
Transmitting file data .
Committed revision 13015.
hugh.radkins@opsws1:models 0$ pwd
/opt/rtcds/userapps/release/isi/common/models
 

After Jeff and Hugh made their fixes to all the ISI models and restarted them, I did a DAQ restart.

The restart was normal except that h1fw1 did not come back. It had tried to restart its daqd process, and then kernel panic'ed similar to Wednesday evening's crash (VFS count 0). I reset the machine by pressing the front panel RESET button, it all came back normally after that.

B. Weaver, H. Radkins, V. Sandberg

LHO WHAM6 Vent Plan for 2016 April 04 - 08

DCC Document: E1600092, “HAM6 - ISI Damper Install”

https://dcc.ligo.org/LIGO-E1600092

APPROVED work to be done in order of importance:

Install HAM ISI Dampers assemblies (Jim W., Nutsinee K.). 

Retune Tuned Mass Dampers (TMDs).

DCC Vent Documents referenced in this plan:

• E1600084, “Installation and Testing Procedure for HAM ISI Dampers”

a)   D1500469 Drawing documents for ham blade dampers

b)   D1600085  Drawing documents for GS13 dampers

c)   D1500200  Drawing documents for flexure dampers

d)   D0900703  Drawing documents for Tuned Mass Dampers (TMDs)

e)   E1100963  Retuning the TMDs

f)   T1500580 HAM ISI Damping Study - Mittleman

g)   G1500880  Damping Tests on Flexture Demo - Lantz

• E1100742 Payload layout update for HAM6
• D0901822 HAM6 Top Level Chamber Assembly
• E1201035 aLIGO Chamber Entry & Exit Procedures
• M1100039 Hanford Checklist - HAM Door Removal
• M1300464 Procedure for preparing aLIGO IFO for pumpdown

SCHEDULE

MON  April 4, 2016  (possibly prior if time allowed)

1)    Transition to LASER SAFE

2)    Turn cleanrooms on around HAM6

3)    Mark and move ISCT6 out of the way to facilitate door removal

4)    Clean area, door flange, and cleanrooms

5)    Stage supplies and equipment

a)     Contamination control kit

b)    B&K hammer setup and computer

c)     Various ISI damper assemblies

d)    ISI tool kit, TMD table setup

e)     ISI parts as per E1600084

f)     Septum viewport cover D1200448

6)    Confirm dust monitor is working

7)    Lock HEPI

8)    Confirm purge air is on at HAM6

9)    Vent HAM6

TUES  April 5th, 2015

10)     Remove ALL 3 CHAMBER DOORS – Review and follow M1100039 “ Hanford checklist – HAM Door Removal”

11)     Entry chamber checklist items: Pick up floor CC wafers.  Take particle counter measurements and record:

12) SEI Lock ISI 

13) Entry chamber checklist items: Pick up table top CC wafers. 

14)Install Septum Window Cover

15) Evaluate, mark and Move Beam Diverter ONLY IF ABSOLUTELY NEEDED for ISI work.  IF CABLES of Beam Diverter get removed, a test of the Beam Diverter function will need to be made before closeout.

16)     Start ISI damper install work. 

a) ISI Wall units need to be moved for this work. 

Note, DO NOT REMOVE ANY TABLE TOP OPTICS.  Confer with Keita before hand if this is needed.

b) Remove Tuned Mass Dampers (TMDs)

c) Install new spring damper assemblies

d) Measure new spring modes using the B&K System

e) Retune TMDs with new info

f) Reinstall TMDs

WED  April 6th, 2016

17) Continue ISI damper install work.

18) Take particle measurements and record:

THUR  April 7th, 2016

19)  Finish ISI damper install work

20)  Check Beam Diverter functionality

21)  Quick check of ISI Balance and clean TF

22)  Remove Septum Window Cover

23)  Chamber closeout – perform applicable exit checklist tasks E1201035.

24)  Take particle count measurements and record:

25)  Replace 1 HAM6 door if possible

FRI,  April 8th, 2016

26)  Replace remaining HAM6 Doors

27)  Begin pump down

              28)  Reset ISCT6

The HAM ISI model updates Tuesday, alog 26321, allow the suspension motion calculation to be done by the ISI.  The filters and matrices to convert from ISI GS13 cartesian basis to the optic euler basis are now filled.

The BSC ISIs were updated for this earlier in the month.  Alogs: original model updates-25913, ISI vs SUS calibration filter- 25993, mods for multi sus plarforms- 26117, library part cleanup/corrections- 26128, BSC filters & matrices populated- 26132, svn commits- 26143.

DetChar can now start pointing to these ISI computations.  Look at channels: H1:ISI-{isi platform}_SUSPOINT_{suspension}_EUL_{euler dof}MON.

euler dof is L, T, V, R, P, orY

isi platform is HAM2, 3,..6, ETMY, ETMX,..,BS

suspensions available are ETMY, TMSY, ETMX, TMSX, ITMY, ITMX, BS, MC1, MC2, MC3, PRM, PR2, PR3, IM1, IM2, IM3, IM4, SRM, SR2, SR3, OMC.  Of course you have to get the suspension on the correct isi platform.

Attached is a snapshot of the medms: the GS13 filter bank and available suspension calcs are accessed from the ISI Chamber overview; the transformation matrices are accessed from the calc screen.

Darkhan, Kiwamu,

We found that the optical follower servo (aka OFS) for the Pcal Y had stopped running. Pressing around some buttons on the medm screen, we could not make it back up running. We are suspecting some kind of hardware issue at the moment. According to trend data, it seems that it stopped running at around 18:30 UTC on Mar 18th for some reason. We will take a look at the hardware in the next Tuesday during the maintenance period.