Displaying reports 68621-68640 of 77130.Go to page Start 3428 3429 3430 3431 3432 3433 3434 3435 3436 End
Reports until 10:53, Monday 02 December 2013
H1 INS (INS)
jodi.fauver@LIGO.ORG - posted 10:53, Monday 02 December 2013 (8787)
Cleanroom 18: SR Testing near HAM4
Per ML's request, I checked the Fan-Filter units (FFUs) in preparation for the OpLev drilling that is due to start in the LVEA this afternoon. I used the hand test and followed-up with an anemometer check on each of the four FFUs on the cleanroom. Three were functioning well: the unit at the north-east (NE) corner did not seem to be functioning. I climbed up and checked each FFU's switch to make sure it was turned to high. All of them were so I started looking for some reason why the NE unit wasn't functioning. As with computer troubleshooting, I checked physical connections first. The NE FFU's plug was not securely seated in its receptacle. Once that situation was remedied, the NE FFU started functioning properly. I also checked the dust monitor: it appeared to be taking periodic readings and the counts were good (0/0) inside the cleanroom even with all my activity in and around the cleanroom. I will follow-up with hand-held dust monitor while drilling is in progress.
H1 CDS
david.barker@LIGO.ORG - posted 10:07, Monday 02 December 2013 (8786)
MSR cooling cycling

The "resting" cooling unit was changed this morning. Unit 1 is now off.

H1 PSL
stefan.ballmer@LIGO.ORG - posted 09:44, Monday 02 December 2013 (8785)
RefCav power steady since last Tuesday's work
Sheila, Stefan

Here is a trend of the last 6 days and last 90 days of the RevCav transmitted power read-back. Based on our measurement the calibration is roughly 1V per 10mWatt of light transmitted through the RefCav.

The reduced max-min spread s might be due to the ISS not being locked during the ISS not being locked during the last 6 days.
Images attached to this report
H1 DAQ (CDS)
david.barker@LIGO.ORG - posted 17:50, Saturday 30 November 2013 - last comment - 09:12, Sunday 01 December 2013(8782)
h1fw0 back up after rebooting h1ldasgw0

Dave, Greg, Dan,

Following Dan's suggesting to try rebooting h1ldasgw0 remotely, at 17:20 I was able to log into the Solaris machine and remotely reboot it. I then re-mounted and re-shared the QFS file system, and then restarted the daqd process on h1fw0. So far h1fw0 has ran for 11 minutes and has written good frames. I'll monitor it remotely.

Comments related to this report
david.barker@LIGO.ORG - 09:12, Sunday 01 December 2013 (8783)CDS

h1fw0 has been running well since the file system fix yesterday, no lost frames.

H1 DAQ
david.barker@LIGO.ORG - posted 09:01, Saturday 30 November 2013 - last comment - 09:57, Saturday 30 November 2013(8780)
h1fw0 down, looks like a file system issue

The primary frame writer h1fw0 is not able to write frames. It looks like an Oracle QFS file system issue, the NFS mounted file system is not accessible. The QFS writer h1ldasgw0 is pingable, but I cannot ssh onto it remotely. If anyone is going to the site today, please call me and perhaps we can try power cycling the machine.

The secondary frame writer continues to write frames OK. If this machine goes down we will no longer be trending vacuum controls signals so I would like to resolve this before Monday if possible.

It looks like the system started failing at 5pm Wed. Our DAQ seems to know about holidays.

Comments related to this report
david.barker@LIGO.ORG - 09:57, Saturday 30 November 2013 (8781)

h1fw0 shutdown:

The h1fw0 file system is actually on-again-off-again, and I've seen times when the two frames written by fw0 and fw1 are not identical. Since we know fw0 is having issues, we can assume that its frames are the incorrect ones. Unfortunately, as the primary writer, h1fw0's frames are preferentially archived by LDAS over h1fw1. I have stopped the daqd regeneration process, h1fw0 has now stopped running and it not being restarted. This will allow LDAS to fully switch over archiving h1fw1's frames.

LHO VE
kyle.ryan@LIGO.ORG - posted 15:15, Friday 29 November 2013 (8779)
Finished roughing HAM2,3,BSC1,2,3,7 combined volumes -> switched to turbo pump
Kyle 

Had spun-up the turbo late on Wednesday but aborted -> turbo too hot -> chilled water lines not circulating in LVEA now? 

Also, disconnected aux. cart from HAM3 and switched on BSC3 annulus ion pump
LHO VE
kyle.ryan@LIGO.ORG - posted 00:02, Thursday 28 November 2013 (8778)
Going home now -> No LVEA purge air available until further notice -> HAM2,3,BSC1,2,3,7 combined volumes not on turbo


			
			
H1 SUS (CDS, IOO, ISC)
jeffrey.kissel@LIGO.ORG - posted 22:14, Wednesday 27 November 2013 (8777)
HAUX / HTTS Model Modification -- Some Signifcant Progress
J. Kissel

I've made significant progress in the efforts to bring the HAM Auxliary Suspensions (HAUX) and HAM Tip-Tilt Suspension (HTTS) front end model infrastructure up to current SUS standards given the integrated testing experience thus far (as per ECR E1300578), focusing on the HTTS. Unfortunately, I'm unable to confirm success of the work I've done because what I've drawn in Simulink does not compile. Ah well. Stay tuned for further progress; details of today's work below. 

---------
Today I created a new front-end simulink model,
${userapps}/sus/h1/models/h1sushtts.mdl
which utilizes a 5 copies of the the brand new, combined, HAUX / HTTS master model called
${userapps}/sus/common/models/HSSS_MASTER.mdl
where HSSS stands for HAM Single-Stage Suspension.
This model (h1sushtts.mdl) will replace
${userapps}/asc/l1/models/h1asctt.mdl
but will continue to run on the ASC front end, h1asc0, on the same core (specific_cpu=4).

Because there is so much unique stuff in the HSSS that differs from the multi-stage suspension's 
${userapps}/sus/common/models/FOUROSEM_STAGE_MASTER.mdl
(e.g. alignment offsets, damping, shuttering) I've concluded that these optics should just be treated like every other multi-stage optic, where the "final" stage (in this case the only stage) is part of the over-all SUS-type library part, but not its own STAGE_MASTER. This renders all of these library parts obsolete:
${userapps}/sus/common/models/
FOUROSEM_DAMPED_STAGE_MASTER.mdl
FOUROSEM_DAMPED_ALIGNMENT_STAGE_MASTER.mdl
FOUROSEM_DAMPED_STAGE_MASTER_newOSC.mdl
FOUROSEM_DAMPED_STAGE_MASTER_oldOSC.mdl
because it contains damping loops, alignment offsets, and includes a lock-in in the manner similar to the rest of the SUS. The obsolete parts are various iterations of the original FOUROSEM master that reflect the history of the HSSS control system, created along the way to add all the new features that we now know we need today. Now that the HSSS master exists, which contains the best of all the above obsolete models, there's no need to keep these others around. I will delete them once I can confirm successful compilation of the models that use the HSSS master, and I've done all necessary modifications to the HSSS MEDM screens. 

Also of note, in addition to the HSSS library blocks for RM1, RM2, OM1, OM2, and OM3, I've created a new block called HTTS, which contains the stuff that uses combined information from all the optics, i.e. the Online detector characterization (ODC) channels, and the USER DACKILL. This way the stored ODC channel will be
$(IFO):SUS-HTTS_ODC_CHANNEL_OUT_DQ
which will look like all the other SUS ODC channels (with $(OPTIC) replacing HTTS), but reflects that the channel contains information about all of the five HTTSs. The only other thing in this block is the USERDACKILL, which also absorbs watchdog information from all 5 HTTSs, so the DACKILL channels will now be
$(IFO):SUS-HTTS_DACKILL_STATE
for example. This DACKILL "OR"s all the HTTS individual watchdog flags, so it's still the silly bad state of cascading a trip from HAM6 to HAM1 (or vice versa), but I'll leave changing watchdog systems for another day and another ECR that's not buried in otherwise janitorial engineering changes.

Finally, in addition to a TON of other clean-up and the relevant addition/modifications of all the features, described in G1301192, I've removed the HAM-A coil drivers voltage monitors from this main "control" model. Instead I've put them in another new front end simulink model,
${userapps}/sus/h1/models/h1susauxasc0.mdl
which will occupy the 6th and final, spare, core of the h1asc0 front end (specific_cpu=5), and use the (otherwise unused) DCUID of 22. In this way, the HTTS become like every other SUS where these non-essential coil-driver monitor signals are read out by a separate core, if not entirely separate IO chassis / front end (including the HAUX which already do have their VOLTMON signals in h1susauxh2.mdl).
This new "monitor" model contains a filter bank for each voltage monitor of all the HTTS (i.e. 4 x 5 = 20), 
$(IFO):SUS-$(OPTIC)_M1_VOLTMON_$(DOF)
of which the both the IN1 and OUT are stored in the commissioning frames (i.e. 40 new channels), but only the OUTs (which will presumably be calibrated) will be stored in the science frames (i.e. 2 channels). Both channels are to be stored at 256 [Hz] as most of the rest of the HSSS channels in the control model will be.

------------
Both models fail to compile, but I believe they're throwing bogus errors.
For h1sushtts, I get:
Bad DAQ channel name specified: 
OM3_M1_OSEMINF_UL_IN1
make[1]: *** [h1sushtts] Error 2
make: *** [h1sushtts] Error 1
make failed
log file is /opt/rtcds/lho/h1/data/buildlog/h1sushtts_2013_45_27_21:45:46
I'm not sure why it would fail on OM3, since this DAQ channel is listed in the same library part as the rest of the four HTTSs in the model.

and for h1susauxasc0, I get:
ADC card numbers must be unique
make[1]: *** [h1susauxasc0] Error 255
make: *** [h1susauxasc0] Error 1
make failed
log file is /opt/rtcds/lho/h1/data/buildlog/h1susauxasc0_2013_48_27_21:48:47
This I know is bogus, because the ADC cards are unique.

H1 IOO
cheryl.vorvick@LIGO.ORG - posted 17:18, Wednesday 27 November 2013 (8776)
IO PSL path power budget

- Kiwamu, Cheryl

I measured the IO path power budget after turning up the power to 9.1W incident on IO_MB_M2, the beam splitter to the IO path.  This put 1.03W into the ALS path that was blocked with a beam dump, and 8.07W incident on the IO EOM.  Temporary beam splitters are still in the IO path, so power loss there was measured to be 3.65W.

Two ways to calculate the throughput of the IO path - both meet the requirement to deliver at least 75% of power downstream of the PMC to the IFO.

 

1) Power incident on IO_MB_M2 to power delivered to the IFO:

9.1W - 3.65W (loss due to beam splitters) = 5.45W

 

4.27W (power after top periscope mirror) / 5.45W (adjusted power incident on IO_MB_M2) = 78% delivered power

 

 

2) Power incident on IO EOM to power delivered to the IFO:

 

9.1W - 1.03W (power in ALS path) - 3.65W (loss due to beam splitters) = 4.42W

 

4.27W  (power after top periscope mirror) / 4.42W (adjusted power incident on IO EOM) = 97% delivered power

 
 
Picture attached shows powers measured and temporary components in the IO and ALS path.   
Non-image files attached to this report
H1 SUS
arnaud.pele@LIGO.ORG - posted 17:07, Wednesday 27 November 2013 (8775)
snapshots

New safe snapshots have been saved for BS ITMX ETMX and IM (using the matlab script save_safe_snap )and they have been commited respectively under revision 6504/6505/6506/6507

LHO General
corey.gray@LIGO.ORG - posted 16:04, Wednesday 27 November 2013 (8769)
Ops DAY Summary

Apollo spent the day moving to get the Dome off of BSC6 & working on other tasks at EY

TMS SUS Cable grounding investigated at EX (Aaron, Jim, Corey, with Patrick covering the Control Room for me)

Power budget work (Cheryl, Kiwamu)

Mounting scroll pump (Kyle)....not sure if he got to this, because....

Purge Air work (Kyle & Gerardo)

Happy Turkey Day.  :)

H1 SUS (SEI)
betsy.weaver@LIGO.ORG - posted 14:23, Wednesday 27 November 2013 (8773)
BSC6 Cartridge De-install in-vac prep

After Apollo removed the dome and erected the work platforms, Jim went up and locked the ISI.  Travis and I then went into the chamber, pulled the witness plates that needed pulling, clamped the ETMx QUAD masses, put PETG face caps on the 2 critical optic surfaces, and covered the QUAD with a C3 bag.  The bag is tied to the QUAD and bundled at the bottom so it is secure and out of the way for the cartridge flight.  So, SUS is done in there - TMS folk are up next, as are de-cablers (all teams? or mostly Jim...).  I left a small SUS tool pan in the chamber for everyone's use.

H1 SUS (CDS, INS, IOO, ISC, SUS)
jeffrey.kissel@LIGO.ORG - posted 13:27, Wednesday 27 November 2013 (8772)
HAUX vs. HTTS HAM-A Drivers -- Yes, They're Different.
J. Kissel, V. Sandberg, A. Sevigny

While uncovering the details of E1201027 because of Cheryl's problems (see LHO aLOG 8767), and attempting once again to merge the digital infrastructure for the HAUX and HTTS (see ECR E1300578), I discovered yet another, annoyingly subtle, difference, between these suspensions that has hindered progress: 

- Yes, the HAUX and HTTS are driven by the same coil driver *board,* D1100117, and therefore have the same (switchable) frequency response and output impedance.
- Yes, the HAUX and HTTS drivers have the same coil driver *chassis* drawing, D1100687, which is written on the outside of both chassis.
- Yes, these HAUX and HTTS drivers both have the *ability* to switch their inputs from the DAC to being grounded (think "TEST/COIL" enable in most SUS drivers, but like the Triple Acquisition Driver, there's no external DB9 "TEST" input), and to switch from an "Acquire," high-gain, high-noise mode to a "Run," low-gain, low-noise mode.
- Yes, these HAUX and HTTS both have external input and output spigots for digital Binary Control and Monitoring that would control these switchable features.

HOWEVER, as far as how these chassis are integrated into the rest of the electronics chain is subtly different:
The HAUX drivers ARE digitally controllable, so
- They are connected to Binary input and output chassis
- There is a Contec BIO card in the h1sush2b front-end / IO chassis, and therefore
- There exists digital decoding and control infrastructure to use and handle the switching in the front-end model/code, and
- The MEDM screen to control the switches is fully functional.

The HTTS drivers
- Are NOT hooked up to Binary input and output chassis,
- In order to make the chassis even useable (i.e. the TEST/COIL enable switch must be set to COIL which is not the default), they are INTERNALLY jumpered, without any external indication other than unclearly labeled LEDs being green when the power is on
- In additon, the Run/Acquire filtering has also been INTERNALLY jumpered to be fixed into Run / Low-noise / Low-gain mode,
- A Contec BIO card DOES NOT exist in the h1asc front-end / IO chassis, and therefore
- There is no digital decoding or control authority infrastructure to use and handle the switching in the front-end model/code, and
- The MEDM screen to control the switches exists, but is non-functional.

As far as Vern and I can tell or could find, this fixed configuration of the HTTS drivers, without any BIO chassis or cards is not shown anywhere in the Board drawing D1100117, Chassis drawing D1100687, or the ISC system drawing D1200666.

Oh yeah, and the front face plate color is different (silver vs blue), and the HTTS drivers are labeled "ISC HAM-A Coil Drivers" on the front face plate, as opposed to the HAUX which are just labeled "HAM-A Coil Drivers," both giving the impression from just a superficial glance at the rack and/or chassis that these are different inside. 

*Sigh* Why do we do this to ourselves?
Images attached to this report
H1 SUS (ISC, SUS)
corey.gray@LIGO.ORG - posted 13:02, Wednesday 27 November 2013 - last comment - 14:25, Wednesday 27 November 2013(8771)
Shorted TMS SUS Cable Investigation

(Aaron, Corey, Jim)

Yesterday, Richard let us know that one of the TMS cable runs (see EX TMS Cable Table, here) was having shorting issues. 

So, these cables are shielded.  There is a plastic mesh on the outside of these cables, and under this is a "copper shield"; this shield runs the length of the cable and ends at pin 13.  It terminates back at the chassis/rack & at end close to OSEM/sensor/etc.  This shield should be isolated from ground (i.e. the BSC Chamber, for example). 

Richard and crew discovered that there was a short in a TMS SUS cable runs & narrowed it down to the cable which runs four OSEMS, in other words:

in-air cable-->     |feedthru|     -------D1000225 s/nS1106816------->     |CB3|     -------D1000234 s/n96-903------->

Aaron confirmed that there was no short in the In-Air Cable.  We then went in chamber and disconnected D1000225 from D1000234.  Aaron then checked for shorts at the air-side of the flange and still found a short.  This narrows down our shorting issue between air-side of the flange and D1000225.  Unfortunately, D1000225 is a seismically-responsible cable, which means it's on the Optics Table for a few inches, and then is taken up and dressed on the ISI for many feet with several cable clamps. 

Jim investigated the one cable clamp on the table, and then moved to another part of the chamber to check an ISI actuator (because this actuator shared a clamp with our D1000225).  We also had Aaron check outside to see if there was a short with the in-vac Actuator cable (If there was, then we could narrow down the short to a clamp where an Actuator and D1000225 were).  The Actuator cable was fine, no short.  So, this means we need to check clamps up on top of the ISI.  We need to have the Dome off to do this.  So this may not happen for a while since the Dome is ON.

So we are leaving as is.  I reconnected D1000225 to D1000234, and Aaron reconnected the in-air cable to the flange.

Note:  The in-air cable appeared to have a bent mounting screw & the head of the cable is pretty gnarled up (making it hard to use a screw driver on it).  It should be replaced.

Comments related to this report
jim.warner@LIGO.ORG - 14:25, Wednesday 27 November 2013 (8774)

This is mostly just a reminder for work after the break.

We need to look at this in light of Betsy's/Rich's logs about the cable shell screws on the feed thru end of the cable, which we hadn't seen or heard about prior to going to the end-station this morning. Our tests earlier indicated that this half of the in-vac cable is the problem, and the cabling up on the ISI looked pretty good (nevermind the fact that it is now mostly inaccessible, and shell screw shorting is our only hope for a quick fix).

LHO General
bubba.gateley@LIGO.ORG - posted 12:45, Wednesday 27 November 2013 (8770)
Apollo crew
The annulus piping was reconnected at GV 20. Spool was installed yesterday.
The test stand was leveled and aligned at E Y. 
The dome was removed from BSC 6 and walking plates installed.
H1 AOS (SUS)
aaron.sevigny@LIGO.ORG - posted 09:06, Wednesday 27 November 2013 - last comment - 12:42, Wednesday 27 November 2013(8758)
Replaced Sus Ham-A Coil Drivers
Replaced the Ham-A Coil Drivers in SUS C4 (U7, U8, U13, U14) with ones modified as requested in E1201027.
Comments related to this report
jeffrey.kissel@LIGO.ORG - 12:42, Wednesday 27 November 2013 (8767)CDS, IOO, ISC
These are the HAM-A Drivers for the HAUX; 
Optic Name       Name on Drawing*       Rack Location      Chassis Serial Number
    IM1                SM1                C4 - U14                S1201156 
    IM2               PMMT1               C4 - U8                 S1201162
    IM3               PMMT2               C4 - U7                 S1201155
    IM4                SM2                C4 - U13                S1201165

* aLIGO SUS HAM2 System Wiring Diagrams, Current Version, D0902810-v7

This means that the output impedance for these drivers is significantly less that before, which means both the noise and the drive strength have decreased by a factor of a factor of 10 (calculation below). This explains why we need much more drive from the IM's DAC in order to retain the same alignment offsets (see LHO aLOG 8759), and as Cheryl mentions, in some cases (IM3), the DAC saturates before we can get to the desired alignment offset. So, we either need to physically offload the alignment on the SUS themselves or reduce the output resistors enough to be able to both obtain the desired alignment while still meeting the noise reduction goal.

(Icoil / Vin)_after      (Vin/Vout)_after / (Rcoil + 2*Rout_after )
-------------        =   ----------------------------------------- 
(Icoil / Vin)_before    (Vin/Vout)_before / (Rcoil + 2*Rout_before )

                        (Rcoil + 2*Rout_before)
                     =  ------------------------
                        (Rcoil + 2*Rout_after)

                        (Rcoil.aosem = 19.8 [Ohm] [see LLO aLOG 3340])
                        (Rout_before = 100 [Ohm])
                        (Rout_after  = 1200 [Ohm]

(Icoil / Vin)_after      
-------------        =  0.098
(Icoil / Vin)_before



Images attached to this comment
H1 IOO (IOO)
cheryl.vorvick@LIGO.ORG - posted 15:59, Tuesday 26 November 2013 - last comment - 12:34, Wednesday 27 November 2013(8749)
IM (aka HAM AUX, HAM-A, HAUX...) coil driver change

Coil drivers were changed for IM1, IM2, IM3, IM4, and all offsets required changes.  This was complicated by choosing to do this change on the day we started pumping down the vertex, i.e. optics are moving due to pumpdown - choose comparisson times wisely.  Spreadsheet attached shows times used and old and new offsets.

Non-image files attached to this report
Comments related to this report
cheryl.vorvick@LIGO.ORG - 10:10, Wednesday 27 November 2013 (8759)

Reset OSEMINF offsets to old values - changed alignment drives to recover optic positions, but we are saturating because the reduction in driver strangth is too much, and IM3 is still 300urad from it's aligned position - not good, won't work. 

Images attached to this comment
jeffrey.kissel@LIGO.ORG - 12:34, Wednesday 27 November 2013 (8768)CDS, INS, IOO, ISC, SUS
For more details, see LHO aLOG 8767.
Displaying reports 68621-68640 of 77130.Go to page Start 3428 3429 3430 3431 3432 3433 3434 3435 3436 End