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Entry  Tue Jun 23 10:06:03 2009, steve, Update, VAC, new maglev RGA scan at day6 newmagscand6.jpgnmagpresd10.jpg
    Reply  Tue Jun 23 15:19:42 2009, steve, Configuration, VAC, V1 is open V1_opennmag.jpg
       Reply  Wed Jun 24 09:21:19 2009, steve, Configuration, VAC, IFO RGA scan with Maglev & Cryo nmagd1ifo.jpgnmagCryopres.jpg
Message ID: 1693     Entry time: Wed Jun 24 09:21:19 2009     In reply to: 1691
Author: steve 
Type: Configuration 
Category: VAC 
Subject: IFO RGA scan with Maglev & Cryo 

Quote:

Quote:

The Maglev is running for 10 days with V1 closed.  The pressure at the RGA-region is  at 2e-9 torr on CC4 cold cathode gauge.

Valve VM2 to Rga-only was opened 6 days ago. The foreline pressure is still 2.2e-6 torr with small Varian turbo ~10 l/s on cc2

Daily scans show small improvement in large amu 32 Oxygen and large amu 16, 17 and 18 H20 water peaks.

Argon calibration valve is leaking on our Ar cylinder and it is constant.

 

The good news is that there are no fragmented hydrocarbons in the spectrum.

The Maglev is soaked with water. It was seating in the 40m for 4 years with viton o-ring seals

However I can not explan the large oxygen peak, either Rai Weiss can not.

 

The Maglev scans are indicating cleanliness and water. I'm ready to open V1 to the IFO

 V1 valve is open to IFO now. V1 interlock will be tested tomorrow.

Valve configuration: VAC NORMAL with CRYO and Maglev are both pumping on the IFO

The IFO RGA scan is normal.

The Cryo needs to be regenerated next. It has been pumping for 36 days since last regenerated.

This has to be done periodically, so the Cryo's  14 K cold head is not insulated by by ice of all things pumped away from the IFO

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