[SBE] Liquid Nitrogen...

[Edwin Bukont]

Isn't that the issue that revealed itself with the Haldron Collider?  As I understood the problem last year, at lowest temps, connections that appear to be fine under normal testing reveal the smallest flaws leading to reflected power, which is a drop in current to the magnet, that causes an imbalance between sections, which in turn will cause a very rapid rise in temp over a small area which melts connections and causes heat related failure of other parts. Because of the proximity to absolute zero, any difference in temp is a problem. The increasing heat spreads quickly beyond the bad connection and causes failure of a substantial portion of the magnet section. I believe they refer to this overall catastrophic event as a 'quench'     

Edwin Bukont CSRE, DRB, CBNT 
Comm-Struction and Services LLC 
Baltimore/Washington DC
V- 410.879.5567 F- 240.368.1265 C- 240.417.2475 

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> Date: Thu, 7 May 2009 02:48:12 -0400

> From: radiotech at bellsouth.net

> To: sbe at sbe.org

> Subject: Re: [SBE] Liquid Nitrogen...

> 

> I think you both just said the same thing.

> 

> As the line gets to absolute zero, the losses will approach zero in both 

> directions. Therefore their would be more power getting to the load. if 

> more power gets to the load more power will be rejected by the load. 

> since the losses would be near zero most of the power rejected from the 

> load would show back up at the source as a reflection.

> 

> So I agree with both of you and say that, unless the load is absolutely 

> perfect, super cooling the transmission line will cause the measured 

> VSWR at the source to increase.

> 

> Thomas Wojciechowski wrote:

> > Last I remember, Absolute Zero affected IR losses, not LC.

> > > From: curt at spam-o-matic.net

> > > On Wednesday 06 May 2009 08:25 pm, Gary O'Guinn wrote:

> > > > Another question I thought of, if one was to "super cool" their

> > > > transmission lines wouldn't that change the VSWR?

> > >

> > > It *may* appear slightly worse, as the losses in the line

> > > approach zero.

> > > In fact, VSWR wouldn't be affected at all, except for going

> > > to zero loss.

> 

> -- 

> Alan Alsobrook CSRE AMD CBNT

> St. Augustine Fl. 32086 904-829-8885

> aalso at Bellsouth.net

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