Search found 10 matches

by ikarus177
Sat May 07, 2011 9:49 am
Forum: The Accelerator
Topic: 2011 Events Discussion
Replies: 184
Views: 46271

Re: 2011 Events Discussion

Does anybody know what ATS means (they are doing "ATS MD" right now)?

Kind regards
by ikarus177
Mon May 02, 2011 5:59 pm
Forum: The Accelerator
Topic: 2011 Events Discussion
Replies: 184
Views: 46271

Re: 2011 Events Discussion

Does anybody know what the "unsqueeze"-tests are good for?

Currently, b* is about 90m in CMS... (but with no beam in the machine)
by ikarus177
Sat Feb 26, 2011 2:30 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 95499

Re: Current Events Discussion

What is this data used for (measuring some beam parameters)?
by ikarus177
Sat Feb 26, 2011 2:20 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 95499

Re: Current Events Discussion

In last year's run they stopped at beta* = 3,5m. In 2009 (with lower intensity and energy) they squeezed to 2m. Beams (with even more bunches as last year) squeezed to beta* = 1,5m should give us a considerabely higher luminosity. On Friday on 23:33 they wrote that they scrape the beam with the prim...
by ikarus177
Mon Aug 30, 2010 6:34 pm
Forum: Portal link and forum suggestions
Topic: Translating lhc-facts.ch
Replies: 7
Views: 3804

Re: Translating lhc-facts.ch

German is my mother tongue, but my english is not as good as it should be. Nevertheless I would like to help to translate the page as it probably improves my skills... A kind of list that says which part of the site gets translated by whom would be helpful for anyone planning to attach to the projec...
by ikarus177
Tue Aug 17, 2010 9:36 am
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 95499

Re: Current Events Discussion

Hi,

as they are planning to test "bunch train operation (1 train of 4 bunches, each separated by 150 ns)", i think they are just going to put the bunches in buckets separated by 150ns (i.e. moving the bunches closer together).

Please correct me, if I should be wrong!

Best regards
by ikarus177
Thu Jul 15, 2010 3:30 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 95499

Re: Current Events Discussion

They are currently hunting the Hump by switching off the "GSM" in the tunnel.
I wonder if this is the same GSM that we use for wireless communication?

ikarus177
by ikarus177
Thu Jul 15, 2010 3:26 pm
Forum: The Accelerator
Topic: Target beam separation / reduced luminosity in ALICE
Replies: 4
Views: 2035

Re: Target beam separation / reduced luminosity in ALICE

Hi, I recently mailed a friend at CERN about this question. He said that ALICE is mostly interested in the "original" pp-collisions, i.e. how many secondary particles are produced by a single event. If you take two nominal colliding bunches, you will typically see 1.5 collisions per bunchcrossing. S...
by ikarus177
Tue Jul 06, 2010 1:39 pm
Forum: The Accelerator
Topic: Target beam separation / reduced luminosity in ALICE
Replies: 4
Views: 2035

Target beam separation / reduced luminosity in ALICE

Hi, does anybody know the reason for why the separation bump in IP2 is not collapsed completely (the CONFIG-Vistar shows a target separation of about -0.133 mm (if I remember correctly))? This (of course) reduces the delivered luminosity to ALICE drastically. I read that is was planned to reduce the...
by ikarus177
Sun Jul 04, 2010 2:18 pm
Forum: New Users Start Here
Topic: hi everybody!
Replies: 3
Views: 1693

hi everybody!

Hi, I just opened an account in this wunderful forum. I've to apologize for my bad english, but nevertheless I hope that we'll have many interesting discussions. As long as I can remember, i was interested in science and electronics. A friend of mine is working at CERN for almost 15 years, and so I ...