 Tue Dec 18 10:43:20 2012, Steve, Update, VAC, vent has completed 
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The 40m vacuum envelope is at atm It took 4.5 hours at ~3 Torr/min speed. Atm1
What I did: |
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Tue Dec 18 16:37:40 2012, Steve, Update, VAC, last RGA scan before vent
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Wed Dec 19 11:53:23 2012, Steve, Update, VAC, AC removed
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Koji, Manasa, Jenne, Jamie, Bob and Steve
Access connector removed this morning and work has began in the IOO chamber. BE WARE OF ANTS ! |
 Thu Jan 17 17:04:49 2013, Steve, Update, VAC, vac monitor screen changed
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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. |
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Thu Jan 24 08:28:35 2013, Steve, Update, VAC, when to pumpdown ?
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| 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. |
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Thu Jan 24 14:40:09 2013, Steve, Update, VAC, RGA backgroung
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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. |
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Mon Feb 11 16:16:27 2013, Steve, Update, VAC, 55 days at atmoshere
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CP Stat 100 sheet-covers were replaced by clean ones on open chambers BS, ITMX,
ITMY and ETMY this morning.
Try to fold the sheets such way that the clean side is facing each other, so they do not accumulate dust. |
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Tue Feb 19 08:42:31 2013, Koji, Update, VAC, ETMX door open
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[Steve, Yuta, Koji]
The ETMX heavy door was removed. |
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Thu Feb 21 15:21:07 2013, yuta, Update, VAC, all heavy doors on, started pumping down annulus
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[Steve, Manasa, Jenne, Sendhil, Evan, Yuta]
We put heavy doors on ITMX/ITMY/BS chamber and started pumping down from annulus. |
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Thu Feb 21 18:01:27 2013, Steve, Update, VAC, pumpdown at 230 Torr
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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. |
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Thu Feb 21 21:12:42 2013, Koji, Update, VAC, pumpdown at 230 Torr
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[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. |
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Fri Feb 22 08:01:25 2013, Steve, Update, VAC, pumpdown continuous
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Pump down is restarted after 10.5 hrs stop overnight. |
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Fri Feb 22 11:12:16 2013, Steve, Update, VAC, pumpdown completed
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IFO P1 pressure is 1 mTorr. It is ready for high power light.
The Maglev took over the pumping at 500 mTorr
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Mon Feb 25 08:22:03 2013, Steve, Update, VAC, pumpdown at day 4
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All normal, IFO pressure 1.5e-5 Torr
RGA is pumped by TP-3 in back ground mode.
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Fri Mar 1 14:50:36 2013, Steve, Update, VAC, pumpdown day 8
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Atm1, RGA background scan with TP3 pumping at day 7
Atm2, IFO CC1 = 1.1e-5 Torr at day 8
Vacuum valve VM3 closed and VM2 opened, it switched the RGA to IFO scanning mode. CC4 = 3.5e-6 Torr |
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Tue Mar 5 14:59:32 2013, Steve, HowTo, VAC, dry-forepump replaced
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TP3 turbo pump's dry-foreline pump was replaced.
How to do it:
The pump should be replaced when it's performance <1.0 - 1.3 Torr |
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Wed Mar 6 08:40:03 2013, Steve, Update, VAC, first scan of this pumpdown
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Pumpdown 75 - Maglev - day 12
Precondition: 66 days at atm, installed TIP-TILTs with coils that replaced PZT-Jena input steering
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Tue Mar 19 17:00:14 2013, Steve, Update, VAC, large window quote of Cascade
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Optical quality 6.5" OD window specs and quotes for vacuum view ports and optical table enclosure are on the 40m wiki_ Aux Optics page.
We have just received a very good quote #2 from Cascade Optical. |
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Mon Jun 3 09:46:40 2013, Steve, Update, VAC, RGA scan at day 100
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Vacuum normal condition at pumdown day 100
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Mon Jul 15 14:12:15 2013, Steve, Update, VAC, RGA scan at day 144
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Pumpdown 75, vacuum normal condition at day 144
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Tue Jul 23 08:21:31 2013, Steve, Update, VAC, Vent has started
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Thanks for the good preparation. IFO pressure P1=20 Torr |
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Tue Jul 23 14:00:03 2013, Steve, Update, VAC, the vent is completed
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The 40m IFO has reached atmospher in 5 hours. It is ready to open chamber condition. The RGA is pumped with the maglev.
P1 pirani gauge is contact dependent as you see it on the linear plot It will be replaced during this vent.
The venting speed was 2-4 Torr / min |
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Tue Jul 23 22:55:13 2013, Jenne, Update, VAC, BS, ITMY doors to be opened in the morning
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We will open the BS and ITMY doors first thing tomorrow morning. I plan to try to be in around 9 am. The first order of business will be to flip the
folding mirrors that are not currently flipped (SR2, SR3, PR3). |
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Wed Jul 24 10:35:41 2013, Steve, Update, VAC, BS, ITMY doors are removed
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Quote:
We will open the BS and ITMY doors first thing tomorrow morning. I plan to try to be in around 9 am. The first order of business will be |
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Mon Jul 29 16:04:40 2013, Steve, Update, VAC, AC removed
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Manasa, Eric, Evan, Koji and Steve,
Access connector removed in order to complete alignment. Light aluminum with acetate windows AC installed.
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Mon Jul 29 16:15:13 2013, Koji, Update, VAC, AC removed
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Prior to the access connector removal, Manasa and I aligned the IFO mirrors.
The arms were locked and aligned by ASS. |
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Wed Jul 31 10:27:00 2013, Steve, Update, VAC, instrument grade air is discontinoued
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We have been using Air Liquide Instrument Grade Air for venting the 40m vacuum envelope. It is no longer available.
The replacement is Alphagas 1, total hydrocarbon <0.1% ppm
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Mon Aug 5 10:50:48 2013, Steve, Update, VAC, RGA background
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RGA background at day 12 of this vent . The maglev is pumping on the rga through VM2
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Tue Aug 6 10:06:29 2013, Steve, Update, VAC, Pumpdown is at 500Torr
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The pumpdown has started at 8:38am
Manasa was here to confirm good alignment of the IFO
Inner jam nuts of AC bellow were torqued to 45 ft/lbs and door nuts were check on opened chambers. |
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Tue Aug 6 16:45:31 2013, Steve, Update, VAC, Pumpdown is completed
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IFO P1=1mT PSL shutter is opened
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Wed Aug 7 10:51:49 2013, Steve, Update, VAC, Pumpdown at 26hrs
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Cold cathode gauge CC1 -h (horizontal) just coming on 9.2e-5 Torr
P2 is the fore line pressure of the maglev. One can see the 4 Torr load during switching over to turbo pumping.
CC4 5e-9 Torr is the performance of the maglev pumping on the RGA only. |
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Wed Aug 7 15:36:29 2013, Steve, Update, VAC, TP2 drypump replaced
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TP2's fore line - dry pump replaced at performance level 600 mTorr after 10,377 hrs of continuous operation.
Where are the foreline pressure gauges? These values are not on the vac.medm screen. |
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Thu Aug 8 07:57:23 2013, Steve, Update, VAC, pumpdown at 48 hrs
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Quote:
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Thu Aug 8 10:31:28 2013, Steve, Update, VAC, few reminders of this vent
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1, Vacuum envelope grounds must be connected all times! After door removal reconnect both cables immediately.
2, The crane folding had a new issue of getting cut as picture shows.
3, Too much oplev light is scattered. This picture was taken just before we put on the heavy door. |
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Wed Aug 14 08:24:20 2013, Steve, Update, VAC, pumpdown at day 8
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Fri Aug 16 09:35:18 2013, Steve, Update, VAC, Vacuum Normal state recognition is back
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Quote:
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Mon Aug 19 11:12:54 2013, Steve, Update, VAC, RGA scan at day 13
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Wed Aug 28 11:23:41 2013, Steve, Update, VAC, crane repair sheduled
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Quote:
1, Vacuum envelope grounds must be connected all times! After door removal reconnect both cables immediately. |
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Wed Aug 28 15:41:42 2013, Steve, Update, VAC, RGA scan at day 23
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Valve configuration: Vacuum Normal
pd76-m-d23
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Thu Sep 5 10:47:58 2013, Steve, Update, VAC, vertex crane folding issue
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[Fred Goldbar, Mike Gerfen, Dennis Coyne and Steve]
We inspected the hinge, 1.25" cross pin and I-beams. It is hard to explain what is causing the folding I-beam corner to jam against |
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Fri Sep 6 09:27:10 2013, Steve, Update, VAC, 31 days after pumpdown
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Quote:
Valve configuration: Vacuum Normal |
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Mon Sep 9 15:33:06 2013, Steve, Update, VAC, vertex crane repair is scheduled
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Quote:
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Tue Sep 10 09:18:22 2013, Steve, Update, VAC, dry pump is getting loud
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TP3 foreline's dry pump is getting noisier and noisier. Turbo TP3 is pumping on the annulos. The foreline pressure is 7.2 mTorr and
it is not degrading. It was swapped in March 5, 2013 |
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Tue Sep 10 15:43:01 2013, Steve, Update, VAC, TP3' dry pump is replaced
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Quote:
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Mon Sep 16 10:57:11 2013, Steve, Update, VAC, RGA scan at day 41
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Quote:
Valve configuration: Vacuum Normal |
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Wed Sep 18 14:57:12 2013, Steve, Update, VAC, vertex crane folding arm removed
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The folding beam removed as shown. Two man supporting it while I hammering it out. Pin was dry and it gulled into supporting hinges.
The rotating hinge will be machined and bushing will be added with Zerk fitting or similar. This will allow lubrication in the future.
see elog #9111 |
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Fri Sep 20 16:37:30 2013, Steve, Update, VAC, vertex crane folding arm is back on
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Quote:
The folding beam removed as shown. Two man supporting it while I hammering it out. Pin was dry and it gulled into supporting hinges. |
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Mon Sep 30 08:53:22 2013, Steve, Update, VAC, vertex crane repair schedule has changed
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Quote:
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Wed Oct 2 14:25:39 2013, Steve, Update, VAC, vertex crane is still out of order
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The smoke alarms were turned off and surrounding areas were covered with plastic.
The folding I-beam was ground down to be in level with the main beam. |
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Wed Oct 9 11:48:10 2013, Steve, Update, VAC, RGA scan at day 65
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Valve configuration: Vacuum Normal |