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#42580 - 02/14/12 05:55 AM LHC - ramping up the energy
redewenur Offline
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Registered: 02/14/07
Posts: 1824
http://indico.cern.ch/getFile.py/access?sessionId=8&resId=1&materialId=1&confId=164089

That info contains a lot of jargon and mystery for us lay people - luminosity, beam dump, quench, scrubbing, pile up, etc* - but here are a few points of interest:

- LHC is designed for a maximum power of 14TeV, i.e. 7TeV/beam.
- Thus far, it's been using only 3.5TeV/beam, as this was least likely to cause 'risk associated with quenches', and was considered probably sufficient for immediate purposes inc. the search for the Higgs boson.
- It's been decided to increase to 4TeV. With upgrades during the past year, it's calculated that the risk at 4TeV will now be =< the risk at 3.5TeV last year.

"Beam Energy after LS1 (1st September 2014):
Strong recommendation
DO NOT GO FOR 7TeV PER BEAM DUE TO THE RISK ASSOCIATED WITH MANY HUNDREDS (THOUSAND) QUENCHES
Around 6.5TeV/beam is safer and sufficient"

* If anyone can cast some light on the meaning of 'luminosity' (!) and so forth, I'd be glad.
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#42581 - 02/14/12 08:15 AM Re: LHC - ramping up the energy [Re: redewenur]
Orac Offline
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Registered: 05/20/11
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LHC luminosity is basically the number of particles in the beam cross section area per unit of time.

http://www.lhc-closer.es/php/index.php?i=1&s=4&p=9&e=0

Essentially the higher the luminosity the more likely you are to get collissions as the two beam meet headon.
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#42583 - 02/14/12 10:08 AM Re: LHC - ramping up the energy [Re: redewenur]
redewenur Offline
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Posts: 1824
Thanks for the info and the useful link.
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#42586 - 02/14/12 10:53 AM Re: LHC - ramping up the energy [Re: redewenur]
Bill S. Offline
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Registered: 08/20/10
Posts: 2954
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That's luminosity sorted, but what about quenches?

Sounds like it might be where the whole thing goes "phutt", or where someone has to throw water over it, but I bet there's a more technical explanation.
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