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Entry  Wed Sep 7 12:03:49 2011, steve, Update, VAC, Pump down has started 
    Reply  Wed Sep 7 18:19:37 2011, steve, HowTo, VAC, stop pump down for overnight 
       Reply  Wed Sep 7 21:45:16 2011, kiwamu, Update, VAC, pump stopped. Pressure is at 450 mtorr vacuum.png
       Reply  Thu Sep 8 10:50:44 2011, steve, Update, VAC, pumpdown #71 comleted pd#71.jpgmaglevpd.jpg
Message ID: 5361     Entry time: Wed Sep 7 18:19:37 2011     In reply to: 5357     Reply to this: 5363   5365
Author: steve 
Type: HowTo 
Category: VAC 
Subject: stop pump down for overnight 

Quote:

Jamie and Steve

We closed ITMX and ITMY chambers and started pumping around 11am

What we did before:

1, turned off AC power  to PZT Jena HV ps

2, checked jam nut positions

3, cheched  single o-ring shims

4, closed psl out shutter

 We are at 30 Torr of 7 hours of pumping with 2 roughing pumps.

Kiwamu will take over the rest of the roughing today. He will keep an eye on  the pumping speed to be  ~1-2 Torr/min  and open up the manual RV1 valve if needed.

The present status is #3023 of  "chamber open to vacuum open" mode and waiting the P1 pressure to drop to 500 mTorr

He will do the following to stop pumping at P1 = 500 mTorr

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.

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