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| 40m Log |
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 Tue Jul 17 12:55:45 2018, Koji, Summary, General, Started pumping 6x
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 Tue Jul 17 18:16:38 2018, Steve, Summary, VAC, pumpdown 81 at 6 hrs 6x
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Tue Jul 17 22:25:41 2018, Koji, Summary, VAC, pumpdown 81 at 6 hrs
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Wed Jul 18 12:49:08 2018, Steve, Summary, VAC, pumpdown 81 at 6 +4.5hrs
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Wed Jul 18 17:36:50 2018, Steve, Summary, VAC, pumpdown 81 at 6 +9 hrs completed
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Thu Jul 19 01:56:25 2018, gautam, Summary, VAC, AUX pump shutdown
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Thu Jul 19 11:01:03 2018, Steve, Summary, VAC, pd81 @ 2e-5 Torr
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Thu Jul 19 13:35:30 2018, Steve, Summary, VAC, annuloses pumped
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Mon Jul 23 09:58:52 2018, Steve, Summary, VAC, RGA scan at day 6
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Mon Aug 6 09:34:02 2018, Steve, Update, VAC, RGA scan at day 20
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Thu Aug 16 07:50:28 2018, Steve, Update, VAC, pumpdown 81 at day 30
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Thu Aug 16 14:48:14 2018, Steve, Update, VAC, why do we need a root pump? 6x
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Fri Nov 16 10:26:12 2018, Steve, Update, VAC, single viton O-rings
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Fri Aug 24 10:51:23 2018, Steve, Update, VAC, pumpdown 81 at day 38
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Thu Oct 4 08:25:50 2018, Steve, Update, VAC, rga scan pd81 at day 78
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Fri Oct 12 08:27:05 2018, Steve, Update, VAC, drypump
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Fri Oct 12 17:37:03 2018, Steve, Update, VAC, pressure gauge choices
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Mon Oct 15 13:59:42 2018, Steve, Update, VAC, drypump replaced
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Tue Nov 13 16:15:01 2018, Steve, Update, VAC, rga scan pd81 at day 119
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Message ID: 14083
Entry time: Wed Jul 18 17:36:50 2018
In reply to: 14082
Reply to this: 14085
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| Author: |
Steve |
| Type: |
Summary |
| Category: |
VAC |
| Subject: |
pumpdown 81 at 6 +9 hrs completed |
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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: |
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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: |
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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).
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