What value of Beta* are they using?

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jmc2000
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Joined: Sun May 08, 2011 2:51 pm

What value of Beta* are they using?

Post by jmc2000 » Thu Jul 28, 2011 10:44 pm

I'd expect Beta* to be between 1.0 and 1.5m, but a value of 10m is shown on this page http://op-webtools.web.cern.ch/op-webto ... =LHCCONFIG

Can someone explain the difference?
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jmc2000
Posts: 160
Joined: Sun May 08, 2011 2:51 pm

Re: What value of Beta* are they using?

Post by jmc2000 » Thu Jul 28, 2011 11:13 pm

jmc2000 wrote:I'd expect Beta* to be between 1.0 and 1.5m, but a value of 10m is shown on this page http://op-webtools.web.cern.ch/op-webto ... =LHCCONFIG

Can someone explain the difference?
Aha! it drops down to 1.5m when squeezing the beam.

But how on earth are they getting luminosities of 1.9/nb/s while keeping beta* and bunch intensity as they were two weeks ago? Emittance decrease was supposed to give 1.5/nb/s max!!
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jmc2000
Posts: 160
Joined: Sun May 08, 2011 2:51 pm

Re: What value of Beta* are they using?

Post by jmc2000 » Fri Sep 02, 2011 9:52 pm

For the final run they're using a value of beta* = 1.0m which should increase the luminosity by a factor of 1.5 and more new records, hopefully :think:
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