sPHENIX discussion of the superconducting solenoid

["Yip, Kin" <kinyip AT bnl.gov>]

Hi John,

> I looked through gpm--but I guess the temperatures aren't visible there so 
> PHENIX shift crews could amuse themselves.  

I asked the Cryo group last week whether they can give us the 'tag' names to 
the Jim Jamilkowski so that we can have them in LogView (or Gpm) etc.   But 
Roberto said that they're too busy (with CeC) to do this for us.   I had 
thought it's just a matter of giving the names sPh_TT1785H to Jim (as they're 
already in the Cryo Control system) ... but maybe it's more complicated ??

Right now, you can only go to check :

http://130.199.104.195/web/cryo.html

which is behind C-AD firewall and it requires IE (the only supported browser).

> Do I get it right that 250K to 4K at 0.57K/hr is 430 hr or 18 days?

In principle, there are 2 stages.  Now, we're using LN2 to cool the Helium 
(in some controlled manner such that
the temp. gradient is < 40K) and when it get close to 80/90 K or so, they'll 
change to a different manner.

But right now, it's quite slow ....Roberto hinted that it might be faster 
later ???

Kin

-----Original Message-----
From: sphenix-magnet-l-bounces AT lists.bnl.gov 
[mailto:sphenix-magnet-l-bounces AT lists.bnl.gov] On Behalf Of John Haggerty
Sent: Sunday, February 28, 2016 9:21 PM
To: sphenix-magnet-l AT lists.bnl.gov
Subject: Re: [Sphenix-magnet-l] just < 251 K

Kin,

Well, I enjoy the news and appreciate all the work that's gone into this from 
you and cryo and the magnet division.

I looked through gpm--but I guess the temperatures aren't visible there so 
PHENIX shift crews could amuse themselves.  Do I get it right that 250K to 4K 
at 0.57K/hr is 430 hr or 18 days?

Thanks to everyone who has made this possible.

On 2/28/16 7:37 PM, Yip, Kin wrote:
> Hi,
>
> Hi,
>
> Just checked the temperature of sPHENIX Manget cool-down.  It seems to 
> drop just below 251 K ...
>
> In case you wonder why I've bothered sending these emails.  I've just 
> come up with the following reasons :
>
> (1) I enjoy writing something, probably second only to soliloquy ;
>
> (2) It creates an illusion that I actually care about the matter in 
> question ;
>
> (3) Since you're reading this, it proves that the readership != 0 ;
>
> (4) If I had nothing to write in my annual BNL appraisal, I may "brag"
> about how many emails that I have written :-)
>
> ..
>
> ..
>
> ..
>
> (n) I can't find a proof that :   Probability(somebody may find the
> information useful) = 0
>
> Kin
>
>
>
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--
John Haggerty
email: haggerty AT bnl.gov
cell: 631 741 3358
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