sPHENIX discussion of the superconducting solenoid

["Than, Yatming (Roberto)" <ythan AT bnl.gov>]

 

2.2E-7 at room temperature and 35 psia: Gas density: about 0.4 kg/m3

At liquid density: 120 kg/m3

Factor of 300 increase in leak, if opening stays the same.

6.6E-5 Torr-L/s leak cold

Net pumping speed of 100 L/s

6.6E-7 Torr

Good for insulating vacuum

 

If leak opens up 10x larger

6.6E-6 Torr

Just sufficient for MLI performance.

 

 

 

 

 

From: sphenix-magnet-l-bounces AT lists.bnl.gov [mailto:sphenix-magnet-l-bounces AT lists.bnl.gov] On Behalf Of Kin Yip
Sent: Tuesday, October 20, 2015 3:32 PM
To: sphenix-magnet-l AT lists.bnl.gov
Subject: [Sphenix-magnet-l] Pressure test ... good enough ?

 

Hi,

Below are the pressure test results from Ray Ceruti that was performed this morning.  I think our operating pressure are like those 20 - 40 PSI.   ( Are they PSIG or PSIA ? )
I hope somebody may comment whether we may operate with these levels of insulating vacuum.

Kin

-------- Forwarded Message --------

Subject:	RE: Result ?
Date:	Tue, 20 Oct 2015 13:20:32 -0400
From:	Ceruti, Raymond B <rayc AT bnl.gov>
To:	Yip, Kin <kinyip AT bnl.gov>
CC:	Anerella, Michael D <mda AT bnl.gov>, Kovach, Paul E <kovach AT bnl.gov>, Cubillo, Mario <mcubillo AT bnl.gov>, Chuc, Mary <mchuc AT bnl.gov>

Hi Kin,

      The test began with a leak detector reading of: 7.3 X 10-9  on the insulating vacuum and no helium applied.

 

After 10 minutes of 81 PSI helium applied to the internal system,-------------- the detector reading dropped to and leveled off at:  2.7 X 10-6

 

Not listed on the formal test we lowered the pressure to 40 PSI and held it for 20 minutes.  The detector reading leveled off at:  2.9 X 10-7

 

We then lowered the pressure to 20 PSI and held for another 20 minutes,----------------------The  detector reading leveled off at:  2.2 X 10-7

 

Regards,

Ray

 

 

 

From: Yip, Kin
Sent: Tuesday, October 20, 2015 12:19 PM
To: Ceruti, Raymond B
Subject: Result ?

 

What's the outcome of this morning's pressure test ?

 

Sent from my BNL Verizon Smartphone