Search found 21 matches

by serych
Sat Apr 30, 2011 3:39 pm
Forum: ALICE
Topic: ALICE solenoid peeks
Replies: 2
Views: 14163

ALICE solenoid peeks

Hi everybody, does enybody know, why Alice solenoid has regular current peeks, as it is visible on http://meltronx.com/lhclite/lhcexpmag.html ? The peeks are only -0.4 Amps (which is only 0.00133% of the magnet current 30 000 Amps), but they seem to me very regular on the time axis (with interval ap...
by serych
Mon May 17, 2010 7:24 am
Forum: Science
Topic: Luminance, luminosity, squeezing explained in English
Replies: 14
Views: 14292

Re: Luminance, luminosity, squeezing explained in English

Thanks for the nice explanation. 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? Thanks for clarification. Jakub Combining all this, luminosity is "effective ...
by serych
Mon Apr 05, 2010 11:46 am
Forum: The Accelerator
Topic: intensity not dropping in 12 hours
Replies: 13
Views: 6338

Re: intensity not dropping in 12 hours

There we are - 13:30 beam lost due to momentary "lost cryo mantain in 78". :cry:

Not 24 yet, but 21 hours of stable beem on 3,5 TeV is great result!!! :clap:

Jakub
by serych
Mon Apr 05, 2010 9:06 am
Forum: The Accelerator
Topic: intensity not dropping in 12 hours
Replies: 13
Views: 6338

Re: intensity not dropping in 12 hours

at present the collision rate is about a millionth of nominal, so I would expect the depletion to be very small at the moment. It's not question of the present collision rate. Now the luminosity is about 2e+10 protons in bunches and the collision rate is approximately form 11 to 45 per second. in t...
by serych
Thu Mar 25, 2010 11:49 am
Forum: The Accelerator
Topic: What is the collimator?
Replies: 5
Views: 5198

What is the collimator?

Does anybody know, what is the role of collimators in LHC? I have found some documents about the construction of the collimators and about the placement into the tunnel, but I cannot find anything about their role in the accelerator.

Thanks in advance for any info

Jakub
by serych
Wed Mar 24, 2010 7:55 am
Forum: The Accelerator
Topic: Accelerator magnet models
Replies: 3
Views: 3513

Re: Accelerator magnet models

tswsl1989 wrote:Looks nice from the picture on the website. Can't run it on here (No VectorPlot in Mathematica 6), but I look forward to having a proper look on Mathematica 7 when I'm next in the labs
It's possible to download Mathematica 7 player for free from http://demonstrations.wolfram.com/

Jakub
by serych
Tue Mar 23, 2010 7:34 pm
Forum: The Accelerator
Topic: Accelerator magnet models
Replies: 3
Views: 3513

Accelerator magnet models

Just for the information of the forum, I have created (in Mathematica 7 software) simple models of dipole, quadrupole (both QF and QD) and sextupole magnets. You can study the forces which affect the particles in machines like LHC using these simple simulations. Today Wolfram has accepted it for the...
by serych
Fri Mar 19, 2010 7:44 am
Forum: The Accelerator
Topic: 3.5 TeV accelleration ! WORLD RECORD !
Replies: 20
Views: 9213

Re: 3.5 TeV accelleration ! WORLD RECORD !

Kudos to all the people from CERN!!!!

Jakub
by serych
Sun Mar 14, 2010 11:17 am
Forum: The Accelerator
Topic: When they change the Fill # ?
Replies: 1
Views: 2015

When they change the Fill # ?

Does anybody know, what exactly Fill # means?
I thought, that it coresponds to the whole machine cycle, but I'm little bit confused, how they change it.
Sometimes they are operating with one fill number all the week and other times they add many fill numbers during one or two hours?

Jakub
by serych
Fri Mar 12, 2010 12:37 pm
Forum: The Accelerator
Topic: Vacuum
Replies: 11
Views: 5743

Re: Vacuum and pressure differences

A am not a physicist, but I'll try to clarilfy with what I know. If I understand it correctly, the pressure differences between the different parts of the accelerator complex will probably not cause as much "wind" as intuition would suggest. Yes, you are right. In the high vacuum there are conditio...
by serych
Mon Mar 08, 2010 7:37 am
Forum: The Accelerator
Topic: What is where in LHC sectors?
Replies: 6
Views: 4995

Re: What is where in LHC sectors?

Thanks a lot. Now I have all the docs needed :yawinkle:
by serych
Sun Mar 07, 2010 7:33 pm
Forum: The Accelerator
Topic: What is where in LHC sectors?
Replies: 6
Views: 4995

Re: What is where in LHC sectors?

Thanks Harbles, it's exactly the level I was searching for. It's interesting, that for Atlas document (and only for this one) password is required and CERN external account isn't enough, but I don't need so detailed document about Atlas now. The first one about the LHC ring as whole is just perfect ...
by serych
Sun Mar 07, 2010 11:20 am
Forum: The Accelerator
Topic: 2010 Briefings, Schedules and Problems
Replies: 48
Views: 22234

Re: 2010 Briefings, Schedules and Problems

Angrond, thanks for the clarification.
by serych
Sat Mar 06, 2010 8:38 pm
Forum: The Accelerator
Topic: What is where in LHC sectors?
Replies: 6
Views: 4995

Re: What is where in LHC sectors?

Thanks Markus, this "what is where" you have described is known to me, but unfortunately it is too coarse for me. On the other hand I have also found many very detailed documents nearly "about each screw used" on the CERN webs, but it is too detailed for me. I'm serching (and until now unsucessfully...
by serych
Fri Mar 05, 2010 1:20 pm
Forum: The Accelerator
Topic: More and more green lights
Replies: 0
Views: 3918

More and more green lights

They are ramping up experiment magnets :clap: