Search found 161 matches

by Tau
Tue Sep 07, 2010 1:30 pm
Forum: Controversial topics
Topic: Several biggest errors of particle physicists.
Replies: 1135
Views: 485890

Re: Several biggest errors of particle physicists.

we are able to register the excessive flux of neutrino from the Earth already now! (later...) I do not know if there are some online internet pages, which show the present flux of neutrino. Wow Ivan, you can measure the neutrino flux yourself? That's impressive. How do you build your own neutrino d...
by Tau
Mon Aug 23, 2010 4:30 am
Forum: The Accelerator
Topic: NEW RECORDS!!!!!!!!!!!!!!!!!
Replies: 10
Views: 6718

Re: NEW RECORDS!!!!!!!!!!!!!!!!!

The good news is, that right after I posted that, the same night they broke the records again:
5.2 MJ in the machine (new world record), luminosity 9 Hertz per microbarn (new LHC record).
I pays off not to give up.
by Tau
Sun Aug 22, 2010 9:45 am
Forum: The Accelerator
Topic: NEW RECORDS!!!!!!!!!!!!!!!!!
Replies: 10
Views: 6718

Re: NEW RECORDS!!!!!!!!!!!!!!!!!

(The energy was 3.2 MJ in that 48 bunch run, by the way. A car of 1000 kg doing 120 kph on the highway is about .5 MJ, for comparison.) Strange coincidence that right after this run was dumped (16:21 on friday), within the hour, cryo failed, cryo tripped while trying to fill again, then there was a ...
by Tau
Sat Aug 07, 2010 3:30 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 193785

Re: Current Events Discussion

It is just a guess, but it could be that some protons are "better" at colliding than others.
If that is the case, the "good" ones would be the ones to go first, so that the quality of the beam quickly deteriorates, and that luminosity drops as a result.
by Tau
Fri Jul 09, 2010 9:36 pm
Forum: The Accelerator
Topic: NEW STATUS DISPLAY
Replies: 6
Views: 5913

Re: NEW STATUS DISPLAY

That is very neat. Nice overview of everything that's going on in a very clever design.
by Tau
Wed Jul 07, 2010 6:37 am
Forum: The Accelerator
Topic: Target beam separation / reduced luminosity in ALICE
Replies: 4
Views: 3412

Re: Target beam separation / reduced luminosity in ALICE

Wait until the ion physics: then Alice will be the detector that really shines. Here the number of collisions will be low, but there will be an enormous amount of particles, and Alice is optimised for that situation.
by Tau
Tue Jun 22, 2010 11:35 am
Forum: Science
Topic: Let's go hump hunting!
Replies: 86
Views: 44360

Hump hunters official song

The official song for hump hunters is of course "Changing Opinion" by Philip Glass. (Thanks for the tip, Photino!)
Lyrics: http://www.lyricstime.com/philip-glass- ... yrics.html
by Tau
Mon Jun 21, 2010 9:24 pm
Forum: Science
Topic: LHC beta* 3.5 meters
Replies: 7
Views: 4751

Re: LHC beta* 3.5 metres

Indeed, I assume emittance stays the same, and the beams stay nicely focused exactly on each other. It is all in "accelerators for pedestrians", but I admit I have a hard time reading it. The basic idea is that the particles in the beam do not all have the same sideways (transverse, they say) speed....
by Tau
Fri Jun 18, 2010 11:32 am
Forum: Science
Topic: Predicting lottery number spread using neural networks
Replies: 13
Views: 19296

Re: Predicting lottery number spread using neural networks

A neural network has the same weakness as the human brain that it sees patterns even if there aren't any.
by Tau
Fri Jun 18, 2010 11:30 am
Forum: Science
Topic: LHC beta* 3.5 meters
Replies: 7
Views: 4751

Re: LHC beta* 3.5 metres

Yes, if you halve beta*, you double the luminance.
by Tau
Thu Jun 17, 2010 8:06 am
Forum: CMS
Topic: CMSSW
Replies: 5
Views: 9054

Re: CMSSW

Are you sure you're on the right forum? Here CMS means "Compact Muon Solenoid", and apparently you are talking about Content Management System. :shifty:
by Tau
Fri May 21, 2010 1:28 pm
Forum: Portal link and forum suggestions
Topic: URGENT: Wiki cleanup - We need your help!
Replies: 4
Views: 9509

Re: URGENT: Wiki cleanup - We need your help!

I fixed about 20 pages. Once you get the hang of it, it is quite easy. I do it like this: - open a page - if it looks messy, click "history" - look for the first revision that looks suspicious (strange or no name, basically) - click on the date - if it is still messy, click on "previous version" unt...
by Tau
Tue May 18, 2010 6:45 am
Forum: Controversial topics
Topic: Several biggest errors of particle physicists.
Replies: 1135
Views: 485890

Nice article about the legal case

Interesting read: from another (legal) viewpoint. This article decribes the case (I guess it was Ivan's):
http://arxiv.org/pdf/0912.5480v2
by Tau
Tue May 18, 2010 6:30 am
Forum: Science
Topic: Luminance, luminosity, squeezing explained in English
Replies: 14
Views: 13884

Re: Luminance, luminosity, squeezing explained in English

Oops... But I found one confusing error in your calculation - one km is 1e3 m and not 1e6 m . How it is possible, that it gives the right result? Is there any other error that compensates this one? And I thought I understood it. :? I'm sorry, but I have to admit that I am stupefied myself. I obvious...
by Tau
Mon May 17, 2010 6:28 am
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 193785

Parasitic collisions

PhilG: I now wrote a program to check the bunch patterns, and I see that parasitic collisions indeed are a problem. Here are the results on the patterns we saw in the LHC until now: - Two bunch pattern: 1 collision, no parasitics - Three bunch pattern: 2 collisions, with parasitic - Four bunch patte...