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ID Date Authorup Type Category Subject
  7587   Mon Oct 22 09:10:07 2012 SteveUpdateVAC@750Torr

Quote:

Quote:

Quote:

 

 PSL shutter closed, manual block in place, HV turned off. P1 is at 200 Torr now.  Jenne is taking over here.

 Valves closed, 500 torr.  Steve will finish off Monday morning, then we'll take off doors and get to work.

 We are almost at atm.  P1 750 Torr,  We are slowly reaching equilibrium.

Attachment 1: ventOct222012.png
ventOct222012.png
  7594   Tue Oct 23 08:45:00 2012 SteveUpdateVACvent day 3

Quote:

Quote:

Quote:

Quote:

 

 PSL shutter closed, manual block in place, HV turned off. P1 is at 200 Torr now.  Jenne is taking over here.

 Valves closed, 500 torr.  Steve will finish off Monday morning, then we'll take off doors and get to work.

 We are almost at atm.  P1 750 Torr,  We are slowly reaching equilibrium.

 The access connector was removed, BS and ITMY chambers were opened yesterday.

New one piece aluminum shell access connector installed. Jenne lowered the PSL out put into MC to ~100mW

Attachment 1: ventd4.png
ventd4.png
Attachment 2: IMG_1743.JPG
IMG_1743.JPG
  7595   Tue Oct 23 09:37:33 2012 SteveUpdateSUS passive TT adjustment correction

Quote:

Tip Tilt pitch adjustment on existing-in vacuum suspension. This can be added by a simple installation of a 1.25" long 2-56 threaded rod with nuts.

 We should check that  their sus wire diameter are 0.0017"  All 2-56 hardware are in and  Bob is cleaning them.

Attachment 1: IMG_1745.JPG
IMG_1745.JPG
  7597   Tue Oct 23 16:18:03 2012 SteveUpdateVACRoughing pumps on for oil change

Leybold D30AQuote:

PR1, PR2 and RP3 turned on for warming up for oil change. Oil changed with 3.2L of MVT-19  fluid in each. This substitute for HE-175 will be used next time.

To finish this job tomorrow: 1, check oil creeping upstream  2, change air filter of air purge if pressure drops <350 mTorr  3, measure venting time of pump

 . Leybold D30A manual is here. Exhaust filter traps were drained. No oil creeping was found. The pump venting time is < 1 minute.

PR-2 needs new secu-valve. PR1 & 2 are in excellent condition.

Attachment 1: oilchange.jpg
oilchange.jpg
  7605   Wed Oct 24 09:15:12 2012 SteveUpdateVACvacuum rack 24V ps was current limited

Quote:

Quote:

Quote:

Apparently all of the ION pump valves (VIPEE, VIPEV, VIPSV, VIPSE) opened, which vented the main volume up to 62 mTorr.  All of the annulus valves (VAVSE, VAVSV, VAVBS, VAVEV, VAVEE) also appeared to be open.  One of the roughing pumps was also turned on.  Other stuff we didn't notice?  Bad. 

 Several of the suspensions were kicked pretty hard (600+ mV on some sensors) as a result of this quick vent wind.  All of the suspensions are damped now, so it doesn't look like we suffered any damage to suspensions.

CLOSE CALL on the vacuum system:

Jamie and I disabled V1, VM2 and VM3 gate valves by disconnecting their 120V solenoid actuator before the swap of the VME crate.

The vacuum controller unexpectedly lost control over the swap as Jamie described it. We were lucky not to do any damage! The ion pumps were cold and clean. We have not used them for years so their outgassing possibly  accumulated to reach ~10-50 Torr

I disconnected_ immobilized and labelled the following 6 valves:  the 4 large ion pump gate valves and VC1,  VC2  of the cryo pump. Note: the valves on the cryo pump stayed closed. It is crucial that a warm cry pump is kept closed!

This will not allow the same thing to happen again and protect the IFO from warm cryo contamination.

The down side of this that the computer can not identify vacuum states any longer.

This vacuum system badly needs an upgrade. I will make a list.

 While I was doing the oil change of the roughing pumps I accidentally touched the 24 V adjustment knob on the power supply.

All valve closed to default condition. I realized that the current indicator was red at 0.2A  and the voltage fluctuated from 3-13V

Increased current limiter to 0.4A and set voltage to 24V     I think this was the reason for the caos of valve switching during the VME swap.

 

Attachment 1: currentlimited24V.jpg
currentlimited24V.jpg
  7619   Thu Oct 25 08:04:45 2012 SteveUpdateSUSmy assesment of the folding mirror (passive tip-tilt) situation

Quote:

The thinner wire has a history that it did not improve the hysteresis (ask Jenne). Nevertheless, it's worth to try.

If you flip the clamp upside-down, you can lift the clamping point up. This will make the gravity restoring torque stronger.
(i.e. Equivalent effect to increasing the mass)

Luckily (or unluckily) the clamp has no defined location for the wire as we have no wire fixture.
Therefore the clamp will grab the wire firmly even without milling.

 The wire clamps should be taken off at the top and at the mirror holder. They need a mill touch up. It would be nice to have the centering jig from LLO for the 0.0017"

The clamps in this condition are really bad. It can sleep, it is not adjustable.

 

Attachment 1: IMG_1748.JPG
IMG_1748.JPG
  7620   Thu Oct 25 09:32:17 2012 SteveOmnistructureIOOusing access connector

Quote:

Quote:

Quote:

Quote:

We really need something better to replace the access connector when we're at air.  This tin foil tunnel crap is dumb.  We can't do any locking in the evening after we've put on the light doors.  We need something that we can put in place of the access connector that allows us access to the OMC and IOO tables, while still allowing IMC locking, and can be left in place at night.

 It is in the shop. It will be ready for the next vent. Koji's dream comes through.

 24" diameter clear acetate access connector is in place. The 0.01" thick plastic is wrapped around twice to insure air and bug tight barrier for the MC to lock overnight. The acetate transmission for 1064 nm is 90 % This was measured at 150 mW   2.5 mm beam size.

 

 Aluminum sheet as shown will replace the acetate. Side entries for your arms and "window" on the top will be covered with acetate using double- sided removable-no residue tape 3M 9425

 The second loop of the bungee cord should be on the top of the acrylic  and still on the supporting aluminum tube as shown.

Attachment 1: acclosing.jpg
acclosing.jpg
  7637   Mon Oct 29 09:33:42 2012 SteveUpdateSUSPRM & ETMY sus damping restored
  7645   Wed Oct 31 14:31:34 2012 SteveUpdatePEMhigh particle count

High particle count confirmed with #2 counter

Attachment 1: highparticlec.png
highparticlec.png
  7656   Thu Nov 1 17:37:00 2012 SteveUpdateGeneralbronze bushing for 40m vac

Suprema- SS clear edge mirror mount 2" diameter is modified for 40m vacuum use. One left and one right handed one. It's adjustment screw housing is bronze! It is not ideal for out gassing.

It will be baked and scanned. If it passes we should use it.

We may need these to bring out some pick-off beams.

Attachment 1: IMG_1764.JPG
IMG_1764.JPG
  7663   Fri Nov 2 16:09:14 2012 SteveUpdateGeneralOpen-sided mount - why

Quote:

Quote:

Quote:

Suprema- SS clear edge mirror mount 2" diameter is modified for 40m vacuum use. One left and one right handed one. It's adjustment screw housing is bronze! It is not ideal for out gassing.

It will be baked and scanned. If it passes we should use it.

We may need these to bring out some pick-off beams.

 I vote against it. We don't know about the grease inside the screw bushings - scans are not everything if adjusting the screw loosens up the grease. If we need more pick off mirrors lets just make some of the kind that we already use inside for the 2" optics.

 I think Steve had these prepared in response to my question a few days ago of how badly do we need adjustability for the POX/POY mirrors?  We already have cleaned open-sided mounts that have no adjustment screws.  So as long as the beam reflects off the ITMs horizontally (which it should), we can do yaw adjustment by twisting the whole mount. We don't need super fine yaw adjustment, we just need to get the beam out, so this is probably good enough.

We should put the POY mirror on this open-sided mount (the one without screws) some time.  Perhaps even today.

 The hex adjustment screw  is removed from the brass bushing for degreasing, cleaning and baking. Newport says the  bushing is is brass not bronze.

Brass outgassing rate is 10x higher than copper that is truth. The surface area is small so  Krytox grease is ok if it is really needed in the 40m. ( It was ok in the past and it is still there )

  7669   Mon Nov 5 10:34:48 2012 SteveUpdateVACexisting vacuum documents

Quote:

Quote:

Quote:

Quote:

Apparently all of the ION pump valves (VIPEE, VIPEV, VIPSV, VIPSE) opened, which vented the main volume up to 62 mTorr.  All of the annulus valves (VAVSE, VAVSV, VAVBS, VAVEV, VAVEE) also appeared to be open.  One of the roughing pumps was also turned on.  Other stuff we didn't notice?  Bad. 

 Several of the suspensions were kicked pretty hard (600+ mV on some sensors) as a result of this quick vent wind.  All of the suspensions are damped now, so it doesn't look like we suffered any damage to suspensions.

CLOSE CALL on the vacuum system:

Jamie and I disabled V1, VM2 and VM3 gate valves by disconnecting their 120V solenoid actuator before the swap of the VME crate.

The vacuum controller unexpectedly lost control over the swap as Jamie described it. We were lucky not to do any damage! The ion pumps were cold and clean. We have not used them for years so their outgassing possibly  accumulated to reach ~10-50 Torr

I disconnected_ immobilized and labelled the following 6 valves:  the 4 large ion pump gate valves and VC1,  VC2  of the cryo pump. Note: the valves on the cryo pump stayed closed. It is crucial that a warm cry pump is kept closed!

This will not allow the same thing to happen again and protect the IFO from warm cryo contamination.

The down side of this that the computer can not identify vacuum states any longer.

This vacuum system badly needs an upgrade. I will make a list.

 While I was doing the oil change of the roughing pumps I accidentally touched the 24 V adjustment knob on the power supply.

All valve closed to default condition. I realized that the current indicator was red at 0.2A  and the voltage fluctuated from 3-13V

Increased current limiter to 0.4A and set voltage to 24V     I think this was the reason for the caos of valve switching during the VME swap.

 

 I asked Jamie to read these docs so we can do some troubleshooting while at atmosphere. We have to have the all valve closed DEFAULT condition working-tested.

I'd like to reconnect all valves after this test so the state identification software could work, including interlocks.

Posted the following documents on 40m wiki.

 

http://www.ligo.caltech.edu/~ajw/40m/40mVaccum_T000054-00.pdf
http://www.ligo.caltech.edu/~ajw/40m/40mProcedures.doc 

https://dcc.ligo.org/DocDB/0015/D000338/000/D000338-00.pdf
  7679   Wed Nov 7 09:09:02 2012 SteveUpdateAlignmentAlignment-
PRM and SRM  OSEM LL 1.5V are they misaligned?
Attachment 1: 9amNov7w.png
9amNov7w.png
  7680   Wed Nov 7 11:43:29 2012 SteveUpdatePEMhigh particle count ALART

The BS camber is open only. We should close ASAP

Outside air quality is 1.7- 2.2  million particles  / cf min of 0.5 micron

Attachment 1: highpartcount.png
highpartcount.png
  7681   Wed Nov 7 14:59:35 2012 SteveUpdatePEMhigh particle count ALART & oplevs

Quote:

The BS camber is open only. We should close ASAP

Outside air quality is 1.7- 2.2  million particles  / cf min of 0.5 micron

 Air is still bad and the chambers are closed. Before lunch  Jamie repointed the PRM oplev. Manasa and I reset oplevs: BS and ITMX.

ETMX and ETMY are fine.

SRM and ITMY oplevs needs more work.

Attachment 1: oplevs.png
oplevs.png
  7682   Wed Nov 7 15:17:15 2012 SteveUpdateAlignmentsteering option with pico motor?
We have two ready for vacuum 1.5" mirror mounts with pico motors in our hands. 


 
Attachment 1: IMG_1795.JPG
IMG_1795.JPG
  7687   Thu Nov 8 09:04:45 2012 SteveUpdateCamerasCanon T3i purchased

Canon EOS Rebel T3i has been purchased. See rating

Attachment 1: BH_409130400.pdf
BH_409130400.pdf
  7692   Fri Nov 9 08:11:57 2012 SteveUpdateAlignmentnothing moved - all good

 Oplevs and IP ANG are still centered. Why  do the SRM and PRM move 5X  more ?  I could not check the sensing voltages because the computer failed.

AS and REFL are looking the same as last night.

ALL LOOKING GOOD!

 

Attachment 1: opsingGOOD.png
opsingGOOD.png
Attachment 2: op8h.png
op8h.png
Attachment 3: 8amF.png
8amF.png
Attachment 4: keepfailing.png
keepfailing.png
  7696   Mon Nov 12 09:21:10 2012 SteveUpdateVACpumpdown has started

I'm looking for IOO steering mirror power supplies. I found two so far: one at 1Y3 as Kepco  + 75V and one at OMC_North rack -150V

Are there any more? The OMC is off.

ANSWER: only one of the steering PZT can be driven, so see their power supplies

Attachment 1: beforepd.png
beforepd.png
Attachment 2: IMG_1800.JPG
IMG_1800.JPG
Attachment 3: IMG_1801.JPG
IMG_1801.JPG
  7697   Mon Nov 12 16:52:03 2012 SteveUpdateVACpumpdown has completed

 The pressure is CC1 3e-4 Torr at 8 hours of pumping.  Status: vacuum normal

The IFO is ready for light

 

Attachment 1: pd74.png
pd74.png
Attachment 2: pd74at8h.png
pd74at8h.png
  7703   Tue Nov 13 08:34:11 2012 SteveSummaryVACpumpdown after 24days at atmosphere

 

 

Attachment 1: pd74d1.png
pd74d1.png
Attachment 2: 24datm.png
24datm.png
Attachment 3: pdd1.png
pdd1.png
  7725   Mon Nov 19 15:58:02 2012 SteveUpdateSAFETYsafety training

Charles Blakemore  our new undergrad help received 40m specific safety training today.

  7732   Tue Nov 20 15:11:22 2012 SteveUpdateGeneralfew more sensing cards

New  Lumitek IR Sensor Cards are here. We got 2 pieces of Q-11-T (2" x 2"), 2 pieces of Q-11-T (0.75" x 0.75")  and one Q-11 (4" x 5")

  7744   Mon Nov 26 10:58:20 2012 SteveUpdatePEMair cond maitenance tomorrow

Air conditioning maintenance is scheduled for tomorrow morning till noon.

  7753   Tue Nov 27 09:44:09 2012 SteveUpdateVACpumpdown at 15 days

 It took 15 days to reach 1e-5 Torr

The RGA was turned on yesterday. The rga scan plotting was not working. Den wrote a Python script to log and plot because the Mathlab had trouble receiving data from our old c0raga.

It turned out that the Joe's log&plot system was working today. Thanks Den and Joe.

Here is the first rga scan.

 

Attachment 1: pd74m15d.png
pd74m15d.png
Attachment 2: pd74m15d_rga1d.png
pd74m15d_rga1d.png
  7754   Tue Nov 27 11:27:22 2012 SteveUpdatePEMparticle count is going up

Jeff is still working on the filter banks.
Attachment 1: 5yparticles.png
5yparticles.png
Attachment 2: particle_6m_6m.png
particle_6m_6m.png
Attachment 3: 1y_particlec.png
1y_particlec.png
Attachment 4: 10y_particle_c.png
10y_particle_c.png
  7755   Tue Nov 27 17:45:42 2012 SteveUpdateGeneralspare optics of AP table moved to cabinet

Spare optics from the AP table were moved to glass cabinet in the east arm. I'm not sure this is the right place. We'll see what everybody thinks.

There were two UNMARKED optics. Shame on you! No pencil marks on the optics either. These optics were shipped to the FBI for finger tip analysis.

 

 

Attachment 1: IMG_1819.JPG
IMG_1819.JPG
  7765   Fri Nov 30 09:59:53 2012 SteveHowToGeneralHow not to

Clean cabinet S15 doors were left open. You have to lock it up!

  7766   Fri Nov 30 11:38:35 2012 SteveUpdatePSLfoil removed from enclosure

Aluminum foil replaced by sheet metal on Enclosure and AP table.

Attachment 1: IMG_1822.JPG
IMG_1822.JPG
  7776   Mon Dec 3 07:40:00 2012 SteveHowToAlignmenthow was the BS chamber misalinged

Quote:

 

 Whoever was working around the BS chamber at 11 AM on Friday should admit it now and take the punishment.

For those of you who like to do work on the interferometer without reporting it in the elog because you think that what you did doesn't affect anything, this is your example of how our time can be wasted by such laziness.

 I'm taking full responsibility for this action and I told them after lunch Friday.

 

HOW NOT TO:

The BS isolation stack  supported by two beam tubes and they can pivot around the pivot point.

Attachment 1: BSsupport.jpg
BSsupport.jpg
  7777   Mon Dec 3 16:37:09 2012 SteveUpdatePEMEM 172 microphones ordered

Quote:

I've put EM 172 microphones inside Steve's isolation box to measure their noise. I've attached mics to each other and aligned them using the tape.

At low frequencies (below 1 Hz) the noise is limited by ADC as there is a 10 Hz high-pass filter inside mic readout box.

ADC noise is measured by splitting the signal from 1 mic into 2 ADC channels.

em172.png

 BT EM172 microphones  are ordered.

  7780   Tue Dec 4 10:44:36 2012 SteveUpdatePEMshort power outage

 

CALIFORNIA INSTITUTE OF TECHNOLOGY

                 FACILITIES MANAGEMENT

 

**PLEASE POST**

 

 

Building:         Campus

 

Date:             Thursday October 04,2012

 

This morning at 2:17 a.m. much of the City of Pasadena including our Campus experienced a electric power sag of short duration, approximately 1/10 of a second. The cause was a fault on one of Pasadena’s 17KV circuits. Some sensitive equipment have been impacted.

                 

Contact:          Mike Anchondo x-4999

  7781   Tue Dec 4 10:51:10 2012 SteveUpdateSUSPRM damping restored

PRM oplev gains set to zero from PIT 0.15 and YAW -0.3 and damping restored

  7807   Tue Dec 11 08:53:52 2012 SteveHowToPEMcables needs care

How NOT to:

The janitor can not clean in areas like this. He may only steps on these cables accidentally as he dust wiping our chambers.

Attachment 1: IMG_1839.JPG
IMG_1839.JPG
  7849   Tue Dec 18 10:43:20 2012 SteveUpdateVACvent has completed

 The 40m vacuum envelope is at atm    It took 4.5 hours at ~3 Torr/min speed. Atm1

 

What I did:

Turned PZT voltages off: 84.1V at OMC-rack location

                                           -  99V at 1Y3 location as PZT_pitch,

                                             56.6V KEPCO at 1Y3 location as PZT_yaw                                           

Took screen shuts of SUS_SUMMARY, yesterday,  Atm3

Turned off OPLEV _SERVOs, today , Atm2

Closed PSL_SHUTTER and green shutters at the ends

 

Set vacuum valves for vent position and opened VM2 for the RGA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Attachment 1: vent74.png
vent74.png
Attachment 2: bvent.png
bvent.png
Attachment 3: befVent.png
befVent.png
  7853   Tue Dec 18 16:37:40 2012 SteveUpdateVAClast RGA scan before vent

 

 

Attachment 1: pd74m36d.png
pd74m36d.png
Attachment 2: 36d_vacuum_normal.png
36d_vacuum_normal.png
  7855   Wed Dec 19 11:14:25 2012 SteveUpdateSUSBeCu wire in stock

Quote:

Just in case we want to retrofit the Tip/Tils with Beryllium Copper wire, here are links to a few sources which have a supply of the right composition and temper:

http://www.lfa-wire.com/Tempered-Alloy-25_C17200.htm

http://www.alloywire.com/beryllium_copper_CB_101.html

http://www.ngk.co.jp/english/products/electronics/berylliumcopper/wire/index.html

http://www.goodfellow.com/E/Copper-Beryllium-Wire.html

 

I don't think its worth it to do something to modify them unless we get a real reduction in the hysteresis - need a benchtop test setup ASAP.

 Be Copper in the lab is from Ca Fine Wire :  alloy 10 CDA 17 in sizes .008"  &  0.002"  There are other sus wire choices in the Drever lab

  7856   Wed Dec 19 11:53:23 2012 SteveUpdateVACAC removed

 Koji, Manasa, Jenne, Jamie, Bob and Steve

Access connector removed this morning and work has began in the IOO chamber.  BE WARE OF ANTS !

 

Attachment 1: workingatatm.png
workingatatm.png
  7862   Thu Dec 20 10:35:27 2012 SteveUpdateIOOTT1 connections

Quote:

[Jamie,Manasa]

We've been trying to figure out the connector for the TTs. Since, we found the cables were plugged in wrong in TT1; when triggered in pitch, the mirror moves in yaw and viceversa.

Referring to the cabling diagram, D1000234-v10, we infer that connectors go as J2 - LR, J3 - UR, J4 - LL, J5 - UL and the connections are made looking at the mirror from behind.

 The view looking at the optic from the back:  

UL    UR

LL    LR

 

 

  7868   Fri Dec 21 09:55:23 2012 SteveUpdateGeneralin-vac adapter cables for TTs

 

 Accu-Glass is closed till Jan 2, 2013

Atm2 would be the ideal solution Gender Adaptor Special with male - female sides and vented D-sub. How many are we getting 2 or 6 ?

Attachment 1: extensioncable.pdf
extensioncable.pdf
Attachment 2: genderchanger.pdf
genderchanger.pdf
  7895   Mon Jan 14 09:08:37 2013 SteveUpdatePSLPMC is only ok short term

 

 The PMC PZT voltage slider seemed sticky.  First it would not do anything, than after moving slider back an forth a few times, it had a range of 60V and later it had full range and it locked

Attachment 1: pmc8d.png
pmc8d.png
  7903   Wed Jan 16 08:29:45 2013 SteveUpdateSUSPRM damping restored

PRM oplev servo turned off.  OLPIT servo gain 0.15 and OLYAW  -0.3 set to ZERO.  PRM damping restored

  7914   Thu Jan 17 17:04:49 2013 SteveUpdateVACvac monitor screen changed

The COVAC_MONITOR.adl was changed. Ion pump labeled as disconnected means: ion pump controller power turned off and ion pump gate valve control connection disconnected.

RP2 roughing pump labeled disconnected means:  hardware  disconnected.

The actual operational, valve control screen has not been changed yet.

Attachment 1: screenmod.png
screenmod.png
  7923   Tue Jan 22 09:10:19 2013 SteveUpdatePEMbig foot is dirty

Please wipe, clean car wheels and wear booties entering the 40m lab.

Obviously this person has no idea about our clean room rules.

Attachment 1: IMG_1873.JPG
IMG_1873.JPG
Attachment 2: IMG_1874.JPG
IMG_1874.JPG
  7924   Tue Jan 22 09:18:50 2013 SteveUpdateTip - Tilttip tilt bases ordered

The corrected drawing base for tip tilt with coils are going to the shop. The will be back by the end of the week.

Attachment 1: TTbc.PDF
TTbc.PDF
  7925   Tue Jan 22 11:09:58 2013 SteveUpdateTip - TiltSS mirror holder ordered

Koji's design of the SS  2" mirror holder with flexure spring optic retainer  like Polaris-K1 has been ordered. We are getting just one to see it's effect on the hysteresis.

Attachment 1: D1201574_v1_Tip-Tilt_Mirror_Holder.SLDDRW
  7936   Thu Jan 24 08:28:35 2013 SteveUpdateVACwhen to pumpdown ?

Reminder: I will be on vacation next week. We would have to put the access connector in tonight if I'm pumping down Friday, tomorrow.

  7937   Thu Jan 24 11:31:45 2013 SteveUpdateSUSETMX damping restored

ETMX sus damping restored.  It is still noisy

  7939   Thu Jan 24 14:40:09 2013 SteveUpdateVACRGA backgroung

 RGA background with VM2 open to Maglev at day 37

 

Note: The PAN gauge of the  annulos is at atm.  Please do not vent this 200 ft long annulos line when you venting the annulos of a chamber. The chamber annulos should be closed off to this long 2"  OD. pipe before you vent the annulos of a chamber.

 

Attachment 1: Screenshot.png
Screenshot.png
  7942   Thu Jan 24 16:31:46 2013 SteveUpdatePEMbuilding exterier wall painted

The wood exteier walls, gutters and doors were painted at CES-Annex building #69

Attachment 1: IMG_1880.JPG
IMG_1880.JPG
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