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ID Date Author Type Category Subjectup
  7655   Thu Nov 1 10:58:49 2012 jamieUpdateAlignmentprogress, then setback - trend of BS table shift

Here's a plot of the BS, PRM, and MC1 suspension shadow sensor trends over the last 24 hours.  I tried to put everything on the same Y scale:

foo.png

There definitely was some shift in the BS table that is visible in the BS and PRM that seems to be settling back now.  The MC1 is there for reference to show that it didn't really move.

  7805   Mon Dec 10 16:28:13 2012 jamieOmnistructureComputersprogressive retrieval of online data now possible with the new NDS2 client

Leo fixed an issue with the new nds2-client packages that was preventing it from retrieving online data.  It's working now from matlab, python, and octave.

Here's an example of a dataviewer-like script in python:

#!/usr/bin/python

import sys
import nds2
from pylab import *

# channels are command line arguments
channels = sys.argv[1:]

conn = nds2.connection('fb', 8088)

fig = figure()
fig.show()
for bufs in conn.iterate(channels):
    fig.clf()
    for buf in bufs:
        plot(buf.data)
    draw()

  1565   Fri May 8 15:40:44 2009 peteUpdateLockingprogressively weaker locks

the align script was run after the third lock here.  it would have been interesting to see the arm powers in a 4th lock 

Attachment 1: powers_3lock.pdf
powers_3lock.pdf
  13678   Mon Mar 12 13:58:37 2018 gautamUpdateGeneralprojector light bulb blown

Bulb went out ~10am today. Looks like the lifetime of this bulb was <100 days.

Steve: bulb is arriving next week

Quote:

Bulb  is replaced.

  13208   Tue Aug 15 08:22:16 2017 SteveUpdateGeneralprojector light bulb replaced

BL-FS300C-PH-LE was replaced after 2,904 hrs  It did not explode this time.  The 4 monts life period is actually pritty good because this is a $73.  cheap bulb. The best-high priced warranty is 5 months.

 

PS: future option_bulbless laser projector

HITACHI LP-WU3500 PROJECTOR	$2,549.00	
DLP, WUXGA, 3500 LUMENS, HDMI, 20K HR LASER, 5YR WARRANTY, 1.36-2.34:1 LENS, 24/7 DUTY CYCLE
45x72 IMAGE FROM 8' TO 13'10" LENS TO SCREEN, AND AT 10' APPROX. 154FL OF BRIGHTNESS ON A 1.0 GAIN SCREEN
http://www.projectorcentral.com/pdf/projector_spec_9722.pdf

This would give you everything you are requesting, plus a lamp-less design and 5yr warranty.  Ground shipping would be free anywhere in the lower 48, and we would not charge sales tax on orders billing/shipping outside of AZ.  If you have any questions or if you would like to order... just let me know!
  13499   Wed Jan 3 15:13:55 2018 SteveUpdateGeneralprojector light bulb replaced

Bulb  is replaced.

Quote:

I noticed this behaviour since ~Dec 20th, before the power failure. The bulb itself seems to work fine, but the projector turns itself off after <1 minute after being manually turned on by the power button. AFAIK, there was no changes made to the projector/Zita. Perhaps this is some kind of in-built mechanism that is signalling that the bulb is at the end of its lifetime? It has been ~4.5 months (3240 hours) since the last bulb replacement (according to the little sticker on the back which says the last bulb replacement was on 15 Aug 2017

 

  13695   Wed Mar 21 10:00:35 2018 steveUpdateGeneralprojector light bulb replaced

Light bulb replaced.

Quote:

Bulb went out ~10am today. Looks like the lifetime of this bulb was <100 days.

Steve: bulb is arriving next week

 

  14048   Tue Jul 10 14:20:09 2018 steveUpdateGeneralprojector light bulb replaced

Bulb replaced at day 110  We have now spare now.

 

  14316   Mon Nov 26 10:22:16 2018 aaronUpdateGeneralprojector light bulb replaced

I replaced the projector bulb. Previous bulb was shattered.

  3649   Tue Oct 5 13:52:15 2010 ranaUpdateCDSproof of trend

Untitled.png

  3626   Thu Sep 30 13:43:29 2010 steveUpdateSAFETYpropane gas smell in control room

The control room's north west corner smelled like propane gas  yesterday around 16:30

We all agreed that the smell was real and I called the safety office. I was told that they received 6 other calls from different parts of the campus.

The smell disappeared in about a half an hour.

  12872   Tue Mar 7 15:17:19 2017 SteveBureaucracyGeneralproperty tag

Property tag found.

Attachment 1: property_tag.jpg
property_tag.jpg
  12058   Thu Mar 31 19:49:31 2016 gautamUpdateendtable upgradeproposed layout v2

The major changes from the previous layout:

  1. I've depicted the Green reflected beam path more accurately - I approximately measured the angle of the rejected beam from the faraday from the Y-end setup. This looks like a workable solution, and is similar to what we have currently at the Y-end
  2. I've added some optics to monitor the DC power and RIN of the AUX laser
  3. I've added two lenses to the input path of the Oplev beam (the path is such that I think we can use the same lenses that are currently being used. 
  4. I've now drawn the beams in CAD so that is marginally neater.

To do:

  1. Post mode matching solutions for AUX laser to doubler and green beam to arm for this proposed layout (should be identical to what we have now, which at least according to the calculation is a good solution, but I will double check - I also need to quantify what the effect of the elliptical beam is)
  2. Check the Gouy phase of the transmitted IR beam at the QPD - we may need to change some lenses in this path. But I think the path as such is close enough (distance-wise) to what we have currently at the X end (after accounting for the fact that the new endtable edge will be closer to the ETM) so I don't expect this to be a show-stopper.

Does any part of this layout need a radical redesign? 

Attachment 1: ETMX_proposed_layout_v2.pdf
ETMX_proposed_layout_v2.pdf
  12060   Mon Apr 4 10:59:12 2016 gautamUpdateendtable upgradeproposed layout v3

I realized I had overlooked an important constraint in the layout, which is that the enclosure will have two supports that occupy some region of the table - these are denoted in blue in v3 of the layout (Attachment #1). I measured the dimensions for these from the existing Y-endtable. The main subsystem this has affected is the IR transmission monitors, but I've been able to move the photodiodes a little to accommodate this constraint.

I've also done the mode-matching calculations explicitly for the proposed new layout (Attachments #2 and #3, code in Attachment #4). While the layout was largely adopted from what Andres posted in this elog, I found that some of the parameters he used in his a la mode code were probably incorrect (e.g. distance between the 750mm lens and the ETM). More critically, I think the Gouy phase for the optimized solution in the same elog is more like 60 degrees. I found that I could get a (calculated) Gouy phase difference between the two PZT mirrors of ~81 degrees by changing the green path slightly, and making the two PZT mirrors Y7 and Y8 (instead of Y7 and Y11, for which the Gouy phase difference is more like 50 degrees). But this way the two steering mirrors are much closer to each other than they were before. Other misc. remarks about the mode matching calculations:

  • The beam diameter at the locations where the Faraday isolators should go is well below 5mm, the aperture size of the Faraday isolators
  • The calculated mode-matching efficiencies suggest that we don't need any cylindrical lenses though the mode from the NPRO is elliptical
  • Attachment #5 is a CAD drawing of the layout with all dimensions used for the mode-matching calculations included (although they are in inches)

These changes also necessitated minor changes to the transmitted IR beampath and the Oplev system, but these changes are minor. I've also switched the positions of the AUX IR power monitoring PD and the fiber coupler as suggested by Koji. The shutter has also been included. 

Attachment 1: ETMX_proposed_layout_v3.pdf
ETMX_proposed_layout_v3.pdf
Attachment 2: IR_modematch.pdf
IR_modematch.pdf
Attachment 3: Green_modematch.pdf
Green_modematch.pdf
Attachment 4: XendALaMode.zip
Attachment 5: ETMX_proposed_layout_dimensions.dwg
  5527   Thu Sep 22 23:10:07 2011 SureshUpdateIOOproposed modifications to the C1IOO model

Rana advised that we put in a lockin-output matrix which will allow us to excite any combination of MC mirrors so that we can excite pure translations or rotations of the MC beam axis.  This would require us to direct a lockin output into all the three mirrors simultaneously with a +1 or -1 as needed in the matrix..

  8270   Mon Mar 11 16:29:29 2013 SteveUpdatePEMproposed seismometer locations

Granite base 20" x 20" x 5"  locations are on the CES side of our IFO arms:  as shown ETMY_ south-west, ETMX_north-east, ITMX_south-east . No height limitation. This side of the tube has no traffic.

SS cover McMaster#  41815T4  (H) SS container cov

Attachment 1: ETMY_sw.jpg
ETMY_sw.jpg
Attachment 2: ITMX_se.jpg
ITMX_se.jpg
Attachment 3: ETMX_ne.jpg
ETMX_ne.jpg
  8272   Mon Mar 11 19:01:21 2013 JenneUpdatePEMproposed seismometer locations

This is my interpretation of where Steve is proposing to place the seismometers (he wrote ITMX southwest, but I'm pretty sure from the photo he means southeast).

I think his point is that these locations are on the less-used side of the beam tube, so they will not be in the way.  Also, they are not underneath the tube, so we will not have any problems putting the covers on/taking them off.

 

 

SeismometerProposedPositions_11March2013.pdf

  10203   Tue Jul 15 17:34:01 2014 manasaUpdatePSLproposing AOM re-alignment

I am going to tweak the alignment of the beam into the AOM (before the PMC) tomorrow morning. If anybody has any objections to this, please raise a red flag.

Proposed alignment procedure:

1. Reduce PSL power to say 10% 

2.  Since the AOM is not on any sort of a mechanical stage, I will have to just play around carefully until I see a maximum power rejection into first order.

I am assuming that moving the AOM is not going to affect the input pointing because all these activities are happening before the PMC. So as long as I have the output beam from the AOM aligned to the PMC at the end, everyone should be happy.

  971   Fri Sep 19 08:09:55 2008 steveUpdatePSLpsl HEPAs turned on
I have just turned on the PSL HEPA filters at 60% operational speed.
  1357   Wed Mar 4 23:42:45 2009 ranaConfigurationPSLpsl db change

I made the following change to correct the sign of the 126MON channel:

allegra:c1aux>ezcawrite C1:PSL-126MOPA_126MON.EGUF -410
C1:PSL-126MOPA_126MON.EGUF = -410
allegra:c1aux>ezcawrite C1:PSL-126MOPA_126MON.EGUL 410
C1:PSL-126MOPA_126MON.EGUL = 410
allegra:c1aux>

  876   Mon Aug 25 10:51:06 2008 steveUpdatePSLpsl headtemp is coming down
The laser water cooler was overflowing this morning.
I removed 500 cc water from the chiller.

The 4 days plot shows clearly:
that the capacity of the chiller is depending on the water level.
Overflowing water is a heat load for the chiller, so laser head temp goes up.
Attachment 1: ht4dw.jpg
ht4dw.jpg
  2943   Tue May 18 11:54:29 2010 steveConfigurationSAFETYpsl mechanical shutter is not working

As we learned yesterday, the PSL laser power out put mechanical shutter is not working in the remote mode. It only works in local manual mode.

Do not rely on the MEDM screen monitor readout! The position is only changing on the monitor. The main beam must be blocked before the output periscope.

  1638   Mon Jun 1 14:49:07 2009 robSummaryPSLpsl thoughts

Some thoughts on what happened with the MOPA cooling. 

Some unknown thing happened to precipitate the initial needle valve jiggle, which unleashed a torrent of flow through the NPRO.  This flow was made possible by the fact that the cooling lines are labeled confusingly, and so flow was going backwards through the needle valve, which was thus powerless to restrict it.  The NPRO got extremely cold, and most of the chiller's cooling power was being used to unnecessarily cool the NPRO.  So, the PA was not getting cooled enough.  At this, point, reversing the flow probably would have solved everything.  Instead, we turned off the chiller and thus discovered the flaky start-motor capacitor. 

Now we have much more information, flow meters in the NPRO and main cooling lines, a brand-new, functioning needle valve, a better understanding of the chiller/MOPA settings necessary for operation, and the knowledge of what happens when you install a needle valve backwards.

 

  10557   Wed Oct 1 16:26:53 2014 SteveUpdateVACpump down #78 completed

 

 Pump down reached "vacuum normal" state. IFO _P1 pressure 1e-4 torr in 8 hrs actual pumping time

 PSL shutter is opened.

Attachment 1: pd78completedin25hrs.png
pd78completedin25hrs.png
  10553   Tue Sep 30 16:18:57 2014 SteveUpdateVACpump down #78 has started

 

Q checked the earth quake stops of SRM and we put the ITMY & BS doors on. 

Attachment 1: pd78hastarted.png
pd78hastarted.png
  10556   Wed Oct 1 10:21:19 2014 SteveUpdateVACpump down #78 stops at 3.5 Torr

Quote:

 

We  stopped pumping just short of 3 hours at 320 Torr.  Pumping speed was 2.7 Torr / min with partially closed RV1 and butterfly valve/

RP1&3 roughing pump hose is disconnected. Butterfly valve removed. The vac envelope is closed. 

 This is our second stop. I will be back this afternoon.     IFO  P1 3.5 Torr

  

Attachment 1: pd78secondStop.png
pd78secondStop.png
  10555   Tue Sep 30 18:02:53 2014 SteveUpdateVACpump down #78 stops at 320 Torr

 

We  stopped pumping just short of 3 hours at 320 Torr.  Pumping speed was 2.7 Torr / min with partially closed RV1 and butterfly valve/

RP1&3 roughing pump hose is disconnected. Butterfly valve removed. The vac envelope is closed. 

Attachment 1: 3h.png
3h.png
  65   Tue Nov 6 09:14:37 2007 steveSummaryVACpump down 65
8 hr plot,
precondition: 5 days at atm,
vent objective: drag wiping mc1, mc2 & mc3 accomplished,
hardware changes: IOO access connector, mc2 chamber door south & west
were removed and reinstalled
pump down mode: slow to avoid steering up dust
One roughing pump was used with closed down valve position in the first 4 hrs

Andrey was very helpful
Attachment 1: pd65.jpg
pd65.jpg
  6930   Fri Jul 6 09:52:35 2012 steveUpdateVACpump down hick up

 I can not understand what really happened here with CC1 gauge or there was really a pressure glitch.

 

attachment 1,  pump down day 3 with 4th of July fireworks in the lab

attachment 2,  before and after vent in 9 days

 

 

Attachment 1: d3wFireworks.png
d3wFireworks.png
Attachment 2: pdhickup.png
pdhickup.png
  5363   Wed Sep 7 21:45:16 2011 kiwamuUpdateVACpump stopped. Pressure is at 450 mtorr

I stopped puming at 9:30 PM and the pressure in P1 is at 450 mtorr.

I followed exactly he procedure that Steve noted on his elog entry.

Here is a plot of the histroy of our pumping today.

vacuum.png

Quote from #5361

 1, close V3

2, close RV1 with torque wheel

3, turn off PR1 & 3

4, disconnect metal hose between RV1 and PR3

 I will start the Maglev tomorrow morning.

  7438   Tue Sep 25 17:21:01 2012 SteveUpdateVACpumpdown completed

 IFO P1= 1mTorr,   CC1 = 5e-4 Torr.  The IFO is ready for work. Be free to open the shutter and turn on HV

Jenne will double check the MC -REFL path for 1W power.  There is a manual block on the PSL table.

Atm1,  Pirani gauge at 9 h 10 min

Atm2, Pump configuration of pd#73 at 9h 35 min

 

Attachment 1: pd73.png
pd73.png
Attachment 2: pd73b.png
pd73b.png
  7441   Wed Sep 26 11:03:04 2012 SteveUpdateVACpumpdown completed

 The new cold cathode gauge CC1 is in place. We were at atmosphere for 28 days ......more later

 

Attachment 1: 40mpd73md1.png
40mpd73md1.png
Attachment 2: 28datm.png
28datm.png
  7454   Mon Oct 1 09:02:17 2012 SteveUpdateVACpumpdown reached vacuum normal

Quote:

 The new cold cathode gauge CC1 is in place. We were at atmosphere for 28 days ......more later

 

 cc1 = 2.3e-5 Torr at day 6 vacuum normal

Attachment 1: pd73md6.png
pd73md6.png
Attachment 2: pd73md6b.png
pd73md6b.png
  5365   Thu Sep 8 10:50:44 2011 steveUpdateVACpumpdown #71 comleted

Vacuum status:  " vacuum normal"   CC1 pressure 5e-5 Torr

Slow roughing through butterfly valve took 11 hours at 1-2 Torr/min speed.  We had a leak at the metal hose connecting o-ring  that became visible  at 200 Torr.

The vacuum envelope pressure rose to 500 mTorr from 450 mTorr  This is 50 mTorr leak plus outgassing over 11 hrs  over night stop =  5  mTorr /  hr

Atm2, Maglev pumpdown details. P2 and P3  are in the foreline of the Maglev. The pressure peaks at 4 Torr beacause the 3 drypumps have  little pumpimg speed at this range.

            External fan is turned on during this one hour period to prevent  Maglev turbo from overheating.

            Same things are  happenning with the two small TP2 and TP3 pumps under load. Their foreline pressure peak at 1 Torr.  They slow down to 45 K RPM from 50K RPM  and warm up to 36-39 C

Precondition: 36 days at atm

Attachment 1: pd#71.jpg
pd#71.jpg
Attachment 2: maglevpd.jpg
maglevpd.jpg
  12483   Mon Sep 12 17:54:24 2016 SteveUpdateVACpumpdown 79

 We are pumping down. The annuloses are below 10 mTorr

The vacuum gauges are not communicating with the medm so there is no plot available.

The main volume pumping is stopped at P1 = 220 Torr  ( New SuperBee 174 Torr ) for overnight.

note: SuperBee was reading 791 Torr at atm and it was not set to 760 !

  12488   Tue Sep 13 17:47:04 2016 SteveUpdateVACpumpdown 79 completed

P1 IFO pressure is 1 mTorr, valve configuration: vacuum normal, annulosses are pumped, RGA is off, not pumped.

THANKS to Chris !

The shutters can be opened with high power.

No communication error message still exist.

I will reboot c1vac1 and c1vac2 to get gauge communication with medm tomorrow.

 

Quote:

(Steve, Chris)

The pumpdown had stalled because of some ancient vacuum interlock code that prevented opening the valve V1 between the turbo pump and the main volume.

This interlock [0] compares the channels C1:Vac-P1_pressure and C1:Vac-PTP1_pressure, neither of which is functioning at the moment. The P1 channel apparently stopped reading sometime during the vent, and contained a value of ~700 torr, while the PTP1 channel contained 0. So the interlock code saw this huge apparent pressure difference and refused to move the valve.

To bypass this check, we used caput to enter a pressure of 0 for P1.

[0] /cvs/cds/caltech/state/from_luna/VacInterlock.st

 

  12492   Wed Sep 14 09:44:09 2016 SteveUpdateVACpumpdown 79 completed

The pumpdown started at 9-12-2016

The IFO is at 5e-5 Torr vacuum normal after 73 day at atm.

ITMX needed to be freed and ETMY-UL is still misbehaving occasionally.

New pirani   and cold cathode gauges added at this vent. They were baked at 100 C for 6 hrs under vacuum.

Go to the Vac Rack to read IFO pressure from the gauge itself when Vac. Monitor is blank as it is now !

 

Quote:

P1 IFO pressure is 1 mTorr, valve configuration: vacuum normal, annulosses are pumped, RGA is not pumped.

THANKS to Chris !

The shutters can be opened with high power.

No communication error message still exist.

I will reboot c1vac1 and c1vac2 to get gauge communication with medm tomorrow.

 

 

 

Attachment 1: pd79.png
pd79.png
Attachment 2: pd79d2.jpg
pd79d2.jpg
Attachment 3: CCcg.jpg
CCcg.jpg
  12496   Thu Sep 15 10:36:32 2016 SteveUpdateVACpumpdown 79 day 3

IFO pressure 3.7e-5 Torr at new cold cathode InstruTech - Hornet

New items in vacuum:

1, ETMX sus tower with new baked sus wire, EP30-2 epoxied magnets, same at different locations also........ ..........  and 2 ruby wirestandoffs.

2, First Contact cleaned arm test masses only. This technic was a 1st time use in our vacuum system.

3, 50 mm ID green glass baffles at the ends

4, witness mirrors at ETMX and ITMY (old oplev mirrors) We observed a very dusty system: sides of optics, towers and tables were wiped. Hepa tents used at Y arm and BS

5, new pirani, cc gauge and 1.5" right angle valve

 

Quote:

The pumpdown started at 9-12-2016

The IFO is at 5e-5 Torr vacuum normal after 73 day at atm.

ITMX needed to be freed and ETMY-UL is still misbehaving occasionally.

New pirani   and cold cathode gauges added at this vent. They were baked at 100 C for 6 hrs under vacuum.

Go to the Vac Rack to read IFO pressure from the gauge itself when Vac. Monitor is blank as it is now !

 

Quote:

P1 IFO pressure is 1 mTorr, valve configuration: vacuum normal, annulosses are pumped, RGA is not pumped.

THANKS to Chris !

The shutters can be opened with high power.

No communication error message still exist.

I will reboot c1vac1 and c1vac2 to get gauge communication with medm tomorrow.

 

 

 

 

Attachment 1: vent78for73d.png
vent78for73d.png
  14082   Wed Jul 18 12:49:08 2018 SteveSummaryVACpumpdown 81 at 6 +4.5hrs

The manual gate valve scan was clean. Atm1     TP1 was pumping on it overnight.

                                                Pumpdown continued to hand over the pumping to TP1 maglev turbo

V1 was opened at P1 400 mTorr  with manual gate at 3/4 turn open position as Magev at 560 Hz rotation.

Two aux fans on to hold tubo temps TP1 & TP3 . Atm3

This is the first time we pumping down from atm with ONE small "beer can" turbo  and throttled gate valve to control load on small turbo forepump

The 70 l/s turbo is operating at 50k RPM, 0.7 A and 31 C,  pumping speed  ~ 44 mTorr/h at 200-400 mTorr range with aux drypump in the foreline of TP3

Watching foreline pressures and current one can keep opening gate valve little by little the so the load is optimized. It is working but not fast.

Let's keep small turbo at 0.8 Amp and 32 C max at this pumpdown. 

Quote:

10:20PM

  • Opened VM2 to pump down the RGA section with TP1
  • Stopped rotary roughing pumps
    • Manually closed RV1
    • Closed V3
    • Stopped RP1 and RP3
    • Vented the RP hose

The P1 pressure is 380mTorr. I allowed Gautam to use the full PSL power (~1W).

Attachment 1: manlGateScan.png
manlGateScan.png
Attachment 2: handing_over_Mag.png
handing_over_Mag.png
Attachment 3: TGVw2auxfans_.jpg
TGVw2auxfans_.jpg
  14083   Wed Jul 18 17:36:50 2018 SteveSummaryVACpumpdown 81 at 6 +9 hrs completed

IFO P1 6e-4 Torr,  manual gate valve is fully open

The annuloses will be pumped down tomorrow.

Valve configuration: vacuum normal, RGA and annuloses are not pumped

Quote:

The manual gate valve scan was clean. Atm1     TP1 was pumping on it overnight.

                                                Pumpdown continued to hand over the pumping to TP1 maglev turbo

V1 was opened at P1 400 mTorr  with manual gate at 3/4 turn open position as Magev at 560 Hz rotation.

This is the first time we pumping down from atm with one small "beer can" turbo  and throttled gate to control load on small turbo forepump

The 70 l/s turbo is operating at 50k RPM, 0.7 A and 31 C,  pumping speed  ~ 44 mTorr/h at 200-400 mTorr range.

Watching foreline pressures and current one can keep opening gate valve little by little the so the load is optimized. It is working but not fast.

Let's keep small turbo at 0.8 Amp and 32 C max at this pumpdown. 

Quote:

10:20PM

  • Opened VM2 to pump down the RGA section with TP1
  • Stopped rotary roughing pumps
    • Manually closed RV1
    • Closed V3
    • Stopped RP1 and RP3
    • Vented the RP hose

The P1 pressure is 380mTorr. I allowed Gautam to use the full PSL power (~1W).

Attachment 1: pd81completed.png
pd81completed.png
Attachment 2: pd81@30hrs.png
pd81@30hrs.png
  14079   Tue Jul 17 18:16:38 2018 SteveSummaryVACpumpdown 81 at 6 hrs

Precondition:  4 days at atm.   Atm5

HEPA tent used during the vent at ETMY  It reduced partical count 10 fold of 0.5 and 0.3 micron particals. Atm6

New items in vacuum:  Clean manual gate valve [Cetec made] from John Worden with 6" id....as it came from Hanford... [ Throttle able gate valve- TGV ] Atm3

                                 ( note: we have 3 more identical in the lab. The original intention was to use them for purging gates )

                                  Optiform Au plated reflector , Induceramics heating elements, similar as existing Cooner cables and related lenses, hardwear. see 14078

                                  OMC related item : none......... 14,110

 

The pumpdown is at 510 mTorr with RP1 & RP3 still pumping. Koji will shut it down the roughing later tonight. Tomorrow morning I will start the pumping by switching over to TP1 maglev.

Thanks for Koji and Gautam'  help of the installation of the manual gate valve. Atm4  This will allow us to control the load on our Varian foreline D70 turbo TP3

 

Attachment 1: pd81@6hrs.png
pd81@6hrs.png
Attachment 2: before_c.jpg
before_c.jpg
Attachment 3: tgv_c.jpg
tgv_c.jpg
Attachment 4: TGVinstalled.jpg
TGVinstalled.jpg
Attachment 5: 4_days_vent.png
4_days_vent.png
Attachment 6: tentHEPA.jpg
tentHEPA.jpg
  14080   Tue Jul 17 22:25:41 2018 KojiSummaryVACpumpdown 81 at 6 hrs

10:20PM

  • Opened VM2 to pump down the RGA section with TP1
  • Stopped rotary roughing pumps
    • Manually closed RV1
    • Closed V3
    • Stopped RP1 and RP3
    • Vented the RP hose

The P1 pressure is 380mTorr. I allowed Gautam to use the full PSL power (~1W).

  14167   Thu Aug 16 07:50:28 2018 SteveUpdateVACpumpdown 81 at day 30

 

 

Attachment 1: pd81d30.png
pd81d30.png
  14183   Fri Aug 24 10:51:23 2018 SteveUpdateVACpumpdown 81 at day 38

 

 

Attachment 1: d38.png
d38.png
  14432   Mon Feb 4 12:23:24 2019 gautamUpdateVACpumpdown 83 - leak tests

[koji, gautam]

As planned, we valved off the main volume and the annuli from the turbo-pumps at ~730 PM PST. At this time, the main volume pressure was 30 uTorr. It started rising at a rate of ~200 uTorr/hr, which translates to ~5 mtorr/day, which is in the ballpark of what Steve said is "normal". However, the calibration of the Hornet gauge seems to be piecewise-linear (see Attachment #1), so we will have to observe overnight to get a better handle on this number.

We decided to vent the IY and EY chamber annular volumes, and check if this made anu dramatic changes in the main volume pressure increase rate, presumably signalling a leak from the outside. However, we saw no such increase - so right now, the working hypothesis is still that the main volume pressure increase is being driven by outgassing of something from the vacuum.

Let's leave things in this state overnight - V1 and V5 closed so that neither the main volume nor the annuli are being pumped, and get some baseline numbers for what the outgassing rate is.

Attachment 1: PD83.png
PD83.png
  7703   Tue Nov 13 08:34:11 2012 SteveSummaryVACpumpdown after 24days at atmosphere

 

 

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  13495   Tue Jan 2 15:43:35 2018 SteveUpdateVACpumpdown after power outage

 

Quote:

There was a power outage.

The IFO pressure is 12.8 mTorr-it and it is not pumped. V1 is still closed. TP1 is not running. The Rga is not powered.

The PSL output shutter is still closed. 2W Innolight turned on and manual beam block placed in its beampath.

3 AC units turned on at room temp 84F

IFO pumped down from 44 mTorr to 9.6e-6 Torr with Maglev  backed with only TP3

Aux drypump  was helping our std drypump during this 1 hour period. TP3 reached 32 C and slowed down 47K rpm

The peak foreline pressure at P2  was ~3 Torr

Hornet cold cathode gauge setting:   research mode, air,

                                                            2830 HV  1e-4A  at 9.6e-6 Torr,

                                                         [  3110 HV  8e-5A at 7.4e-6 Torr one day later ]

Annuloses are at 2 Torr, not pumped

Valve configuration:  vacuum normal, RGA is still off

PSL shutter is opened automatically. Manual block removed.

End IR lasers and doublers are turned on.

 

NOTE: Maglev " rotation X " on vacuum medm screen is not working! " C1:Vac-TP1_rot " channel was removed.  Use " NORMAL X " for rotation monitoring.

*We removed this (i.e. rotation) field from the MEDM screen to avoid confusion.

Attachment 1: pumpdown_from_44_mTorr.png
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  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.

 

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  8131   Thu Feb 21 18:01:27 2013 SteveUpdateVACpumpdown at 230 Torr

 

 We are pumping down with RP1 & RP3 oily roughing pumps at 3 Torr/min speed. The butterfly valve was just removed.

The PSL shutter is open to vacuum at ~100  mW 1064 nm. The inter lock should close it at ~5 mTorr.

Rana will shut down pumping tonight.

He will close V3 from screen, close RV1 valve with torque wheel, turn off roughing pumps and disconnect hose between RV1 and roughing pumps.

I will restart pumping early morning tomorrow.

 

  8134   Thu Feb 21 21:12:42 2013 KojiUpdateVACpumpdown at 230 Torr

[Rana, Yuta, Koji]

21:05 at the pressure of 10torr
V3 closed. RV1 manually closed. RPs were turned off. And the bellows between RV1 and the rughing pumps are disconnected.

ELOG V3.1.3-