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Reports until 11:29, Friday 22 November 2013
H1 ISC (ISC)
stefan.ballmer@LIGO.ORG - posted 11:29, Friday 22 November 2013 (8688)
ISCTEX (in air) work
With the IR beam bath on the trans-mon ISC table (in vac) aligned, I had to move the IR telescope of the in-air ISCTEX by 3in in -x direction, and lower the top periscope mirror by maybe 4in. I moved the two-in lens on the periscope down to accommodate the top periscope mirror. Mirrors and lens were roughly aligned, but need a fine-tweak once we have a steady reference beam.
LHO VE
kyle.ryan@LIGO.ORG - posted 09:43, Friday 22 November 2013 (8687)
No leaks on XBM cryopump adapter spool (WA-1A?) annulus
Ion pump only for 24 hours = 3 LEDs -> Decoupled aux. pump cart
LHO General (PEM)
patrick.thomas@LIGO.ORG - posted 09:40, Friday 22 November 2013 (8686)
Changed dust monitor sample and hold times
I changed the sample and hold times for the dust monitors to the following:

LVEA 3
Sample Time: 20 sec
Hold Time: 40 sec

LVEA 5
Sample Time: 20 sec
Hold Time: 280 sec

LVEA 9
Sample Time: 20 sec
Hold Time: 40 sec

LVEA 10
Sample Time: 20 sec
Hold Time: 40 sec

LVEA 15
Sample Time: 20 sec
Hold Time: 40 sec

LVEA 16
Sample Time: 20 sec
Hold Time: 40 sec

EX 1
Sample Time: 20 sec
Hold Time: 40 sec

EY 1
Sample Time: 20 sec
Hold Time: 40 sec

DR 1
Sample Time: 20 sec
Hold Time: 280 sec

LAB 1
Sample Time: 20 sec
Hold Time: 280 sec

LAB 2
Sample Time: 20 sec
Hold Time: 280 sec

LAB 3
Sample Time: 20 sec
Hold Time: 280 sec
H1 ISC
keita.kawabe@LIGO.ORG - posted 23:39, Thursday 21 November 2013 - last comment - 15:46, Friday 22 November 2013(8681)
TMSX today (Jeff B, Andres, Alexa, Stefan, Keita)

Temp dogs were removed.

Isctex green periscope readjusted as it was close to the edge.

Tele beam position readjusted so the beam is centered on the primary.

Red extraction path was done.

High power beam dump path was done.

Working on IR QPD sled path.

Comments related to this report
keita.kawabe@LIGO.ORG - 06:56, Friday 22 November 2013 (8682)
Found that 1" 50-50 IR splitter on the IR sled had a wrong wedge orientation and the ghost beam was hitting the edge of the QPDA. Rotated 180.
keita.kawabe@LIGO.ORG - 07:32, Friday 22 November 2013 (8683)

Picomotor cable mystery.

It seems as if picomotor ordering is flipped somewhere between Beckhoff and in-chamber.

Picomotor in-vac cable has one DB25 (called J1) on one end and four smaller cables with mighty mouse connector (J2, J3, J4 and J5) on the other. In the cable drawing (https://dcc.ligo.org/D1000238) , these four cables are numbered such that the one closest to pin 1 of DB25 is J5, the farthest J2.

Both sites agreed that J2 goes to the green 50-50 splitter (M3), J3 to the steering mirror just upstream of the periscope (M6), J4 to the dichroic that steers the IR to the sled (M4), and J5 to the steering mirror just upstream of the IR sled (M14).

Now, the aluminum collar for the picomotor connectors  are labeled as "A", 'B", 'C" and "D", and it's these labels that I and Corey used, assuming that A is J2 and D is J5.

However, in the cable harness routing diagram (https://dcc.ligo.org/LIGO-D1300007), the same cable is specified such that the one closest to pin1 of DB25 is "to M1", the farthest "to M4", it is ordered starting from pin 1 of DB25, so it's the opposite of the cable drawing. So A might be J5 and D J2, and this might be it. If so, we will re-rout the in-vac cables.

I have a vague memory that Corey confirmed that A is the closest to pin1, but I'm not 100% sure.

Since there's no way we can find which cable is closer to pin 1 without disconnecting DB25, and since there's a certain risk to disconnect and reconnect in-vac DB25, I'm asking Rich Abbott if he remembers which convention was used when labeling mighty mouse connectors.

corey.gray@LIGO.ORG - 11:37, Friday 22 November 2013 (8685)

Checking Cable (D1000238) In Lab

I pulled out two random (s/n S1104585 & S1105221) Picomotor cables to check how the four Mighty Mouse connectors are marked & where they are located.  On both cables, they are marked in a way which matches the drawing/our guess for EX TMS (but not for Keita's memory for what I confirmed in-chamber in Sept):

  • J5 = "D" = closest to Pin#1 (of DB25 Male)
  • J4 = "C"
  • J3 = "B"
  • J2 = "A" = closest to Pin #13 (of DB25 Male)

I'm re-attaching photo/note of what we saw when we tested the Picomotor cable at the Test Stand next to the BSC (we observed the switched around order back in Sept):

  • "D" = M14 ----but on picomotor driver/tester box ---> "motor 1"
  • "C" = M4 ----but on picomotor driver/tester box ---> "motor 2"
  • "B" = M6 ----but on picomotor driver/tester box ---> "motor 3"
  • "A" = M3 ----but on picomotor driver/tester box ---> "motor 4"
Images attached to this comment
alexan.staley@LIGO.ORG - 15:46, Friday 22 November 2013 (8698)

(Alexa, Stefan, Kiwamu, Keita)

The convention at both LHO and LLO for the picomotor in-vac cables is as follow:

  • J2 = M3
  • J3 = M6
  • J4 = M4
  • J5 = M13

Unfortunately, the in-vac cables in HAM6 had cable "A" = J2 closest to pin 1 and cable "D" = J5 closest to pin 13; however the opposite is desired. This explains the switch. We have swapped the ABCD cables in vacuum, and now the picomotor controls are all correct. Success!

Moral of the story: be careful with the ABCD labellings on the picomotor in-vac cabling because they don't seem to be consistent. It would also be nice to have pin 1 labeled on the outside of the cable connector so that we do not have to disconnect it to know where pin 1 is located. 

H1 SEI
sebastien.biscans@LIGO.ORG - posted 17:38, Thursday 21 November 2013 (8680)
ISI-ITMX measurement for the night
I started a measurement for the night. Should be done by tomorrow morning.

 

*** HPI ***

Unlocked

*** ISI ***

Undamped

*** SUS ***

Damped

H1 CDS
cyrus.reed@LIGO.ORG - posted 16:52, Thursday 21 November 2013 (8679)
Network Changes

I've made some changes in the core switch (sw-msr-core) to support the new workstations subnet that we need to build to support the burgeoning number of hosts we have.  In addition, I've updated the network interfaces on cdsegw0 to account for the new VLAN, and created associated EPICS gateway processes to match.  cdsfs0 is now configured to allow mounts from 10.22.0.0/20 as well.

H1 PSL
sheila.dwyer@LIGO.ORG - posted 16:26, Thursday 21 November 2013 (8678)
PSL on

Cheryl, Sheila, RObert

The PSL shutdown because the power watch dog tripped.   (second attached trend shows power slowly dropping) Cheryl and I restarted it about an hour ago. 

All week, the reference cavity alignment has been fluctuating.  right now I have turned the TPD resonant threshold down to 0.3 V so that the FSS is is locked.  This is supposed to be 0.9V, so this is pretty bad.  Although we have had drifts over the last few months, this week has been especially bad.  The PMC transmitted power shows the same trend, so the problem seems to be upstream of the FSS. (first screen shot shows trends)

Robert and I had a look at some temperature trends, we saw that the new  higher termperature commisioning mode the temperature on the table has been fluctuating a more than Robert expected, and that this temperature fluctuation is correlated with alignment fluctuations.  This has been true since https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=7564

So, in summary there seem to be 2 unrelated problems, one that has cause the PMC trans power to fluctuate more than usual this week, and the temperature fluctuations that have been present since late august. 

Images attached to this report
LHO General
cheryl.vorvick@LIGO.ORG - posted 16:18, Thursday 21 November 2013 (8677)
OPS Summary

 

- Filiberto and Frank to EY for electronics verification

- Jeff and Thomas to BSC3 to work on ACB

- Bubba/Apollo to install viewports on HAM3

- Jodi and ? to EY to vacuum out bellows/beam tube where spool was removed

- Joe and Greg - laser hazard in H2 PSL enclosure for alignment work

- Sheila - transitioned EX to laser safe

- Jeff and Andres to EX to remove pushers (in chamber work)

- around noon, starting to put HAM2 doors on

- Jeff and Andres back out to EX after lunch and talks

- HAM2 doors are on

- Reverse Osmosis alarm around 3PM

- Sheila restarted the H1 PSL laser

- I redamped HAM2 and HAM3 optics

Images attached to this report
H1 SEI
hugh.radkins@LIGO.ORG - posted 16:07, Thursday 21 November 2013 (8676)
WHAM2 ISI Balance--good

After the removal of 12 bolts from the Table top balance masses (to add viton dampers) we expected needing to replace that lost weight.  We added 3 D071201 (0.3lbs total) to the NW corner--see image.  Betsy removed some more teflon stuff later and we see almost no effect from that change, it was small and fairly uniform in distribution.  ISI CPS vertical readings are a few hundred counts, zero is perfect on this HAM and well under the 2000 cts absolute requirement.  Lock/unlock differences are essentially unreadable; this ISI locks very easily.

Concern though about this added mass: The masses are secured in place with a couple 1/2-13 nuts on the long studs.  There is a recess into which the mass is pulled with the tightening of the nut.  It actually bends the mass in the middle where it is unsecured.  It is light but if there is an unwanted resonance from this, we need to scheme some mitigation: something behind it in the middle to prebend it, a bushing in the well to keep ends from being pulled in...

Images attached to this report
H1 SUS (AOS, SEI)
jeffrey.kissel@LIGO.ORG - posted 15:07, Thursday 21 November 2013 - last comment - 15:14, Thursday 21 November 2013(8673)
ISI-ITMX TF problems -- It was the QUAD's temporary teflon stops
J. Kissel, B. Weaver, M. Landry, S. Biscans, C. Remet H. Radkins, T. Vo, B. Gateley

*phew* 

The last known in-chamber payload suspect in the misdemeanor seen earlier with the ISI-ITMX vertical transfer functions was the teflon rails that were temporarily installed on the SUS-ITMX for first-contact cleaning. So, Betsy and I went out and removed them. Preliminary measurements (attached below) indiciate these were the problem, the ISI looks fine now. We are a go for final cleaning and close up of BSC3 (as agreed by all those listed above). In the next half hour that it takes me to finish writing this aLOG, Sebastien is going to get a few more transfer functions just to be sure we're OK, but Celine (from afar) has been watching the story, and has informed us that she had seen similar badness when she had taken ISI transfer functions with the QUAD locked (with EQ stops), so we 100% confident that things have been restored to goodness already. 

To repeat for clarity,
- It wasn't the dome installation that caused the badness
- It wasn't the arm cavity baffle's eddy current dampers or mechanical rubbing
- It wasn't the in-chamber cabling
It was 300 kg of mass (the suspended elements of the QUAD) that had been temporarily locked up with teflon rails for the (new, yet) normal first contact routine.

--------
Plot Caption: 
[[ISI-ITMX, Stage 0-1 Actuator drive, Stage 1 CPS sensor response, driven transfer function. 
  HEPI is floating and balanced, ISI is floating and balanced, ISI control is entirely OFF, 
  ACB is freely suspended and Eddy-current Damped, SUS-ITMX is freely suspended with main 
  and reaction chain locally damped with top-stage OSEMs]]
BLACK Known good reference measurement taken over Tuesday-to-Wednesday (2013-Nov-19 to 20) night.
BLUE The bad state the ISI has been since measuring quickly Wednesday afternoon, after 
     Teflon rails are installed, 
     QUAD is first-contact painted, 
     ACB is B&K hammered
     Dome is installed
     ACB is re-inspected
     ISI and other in-vac cabling is inspected (from underneath the ISI)
RED Now good, current measurement, after Betsy removed the temporary teflon rails.

Non-image files attached to this report
Comments related to this report
sebastien.biscans@LIGO.ORG - 15:14, Thursday 21 November 2013 (8675)

Just to confirm what Jeff said: I took a few more quick transfer functions (ST1, ST2, vertical, horizontal), and everything looks back to normal (the teflon stops were the issue). We're ready to move on.

H1 SUS (SYS)
betsy.weaver@LIGO.ORG - posted 14:51, Thursday 21 November 2013 (8672)
Doors on HAM2

Today, Calum and I cleaned HAM2, focusing on the table and SUS surfaces.  We then pulled the First Contact on MC1, MC3, and PRM and made an inspection.  Hugh also made a final balance and unlocked the ISI.  I took short average TFs of L, P, V DOFs on MC1, MC3, and PRM to verify no major mechanical rubbing.  I also checked SUS health via the ability to close damping loops of these suspensions and also the PR3.  We pulled the first FC sheet at 11:10am and the last door went on at 1:15pm.

 

Note, during the last vented period, we noted that the PRM cleaning was not very sucessful and streaks were observed on the HR surface.  We chose to leave the mess at the time.  The FC cleaning we did yesterday/today seems to have worked as I could not see any such streaks on the optic.

H1 SYS (SUS)
betsy.weaver@LIGO.ORG - posted 14:44, Thursday 21 November 2013 - last comment - 14:56, Thursday 21 November 2013(8670)
Witness Plate in HAM2 added "just before pump down"

Today, in the final steps before putting the doors on HAM2, we laid a fresh witness plate (wafer) near to the center of the table.  It is in the area slightly behind PRM.  This is the witness plate that should be picked up and analyzed immediately after the next vent and the doors are off.

Comments related to this report
betsy.weaver@LIGO.ORG - 14:56, Thursday 21 November 2013 (8674)

We also added a 1" witness optic in front of the MC3.  It is standing up, clamped between 2 PEEK cable clamps.

H1 ISC
alexan.staley@LIGO.ORG - posted 11:59, Thursday 21 November 2013 (8668)
Corner Picomotors Cabling

The Vertex ISC Cable Pull table (E1200408) has some inconsistencies in bechoff chassis port labeling for the picomotors. The pull table indicates:

The OL cables were connected to port 3, while the HAM 6 cables were connected to port 5. Based on the EtherCat Systems drawing (D1100683),

 

I have correctly connected these cables according to the EtherCar system drawings. The pull list remains to be updated. **

H1 SEI
sebastien.biscans@LIGO.ORG - posted 11:00, Thursday 21 November 2013 - last comment - 14:49, Thursday 21 November 2013(8666)
ISI-ITMX rubbing

Find attached the plots of last night transfer functions.

As you can see, something bad happened at the resonances around 1Hz since we put the dome on. This badness appears on the vertical sensors, both stages. It mostly seems like a rubbing cable.

Hugh and I are going in the chamber right now to see if we can find something.

 

PS: L4C-H2 presents a gain of 0.5. We'll fix that later.

Non-image files attached to this report
Comments related to this report
betsy.weaver@LIGO.ORG - 14:42, Thursday 21 November 2013 (8669)

Recall - as I pointed out below, when we go the "handoff" from SEI to close the dome and move on with other chamber closeout items, I clamped the ITMx optics.

sebastien.biscans@LIGO.ORG - 14:49, Thursday 21 November 2013 (8671)

Thanks for the recall Betsy. I think we found our issue here! I'm running quick measurements right now to double check, but we should be good to move on soon.

H1 ISC
kiwamu.izumi@LIGO.ORG - posted 10:04, Wednesday 20 November 2013 - last comment - 09:29, Friday 22 November 2013(8641)
Status of the HAM6 QPD sled : modemaster not functioning

The last item currently we are missing for HAM6 is a QPD sled (see 8633) from the ISC point of view. But the preparation of the sled is not going well.

ModeMaster is not functioning:

Yesterday, I was going to start preparing the sled which requires the use of a ModeMaster for the precision lens adjustment. However it seems that the germanium detector of our ModeMaster is not functioning for some reason. It worked fine with a different silicon detector, but didn't work with the germanium one. I looked at the output from the detectors with an oscilloscope. The silicone showed a square-looking, 20 Hz-modulated output and the amplitude seems depending on the amount of laser power, which makes sense to me. However, once I switched the detector to the germanium one, it showed a similar square-looking wave, but the amplitude didn't depend on the laser power. Moreover, the signal seems just railing -- it swung from -5 to 13 V in every square wave. I incline to conclude that the germanium detector became broken.

Trying to get a replacement:

I already sent an email to Adam and Valera in Livingston to see if they can lend us their ModeMaster. At the same time, I will get some technical support from the company and hopefully get some replacements.

Comments related to this report
kiwamu.izumi@LIGO.ORG - 09:29, Friday 22 November 2013 (8684)

Some pictures:

The output from the broken germanium detector on a oscilloscope when powered up. A 20 Hz square-looking wave is visible. The waveform didn't change with and without light.

The germanium detector when apart from the head.

Images attached to this comment
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