Search found 66 matches

by oxodoes
Sat Apr 17, 2010 1:27 pm
Forum: Controversial topics
Topic: Identifying pseudoscience
Replies: 19
Views: 6846

Identifying pseudoscience

How to identify pseudoscience (without knowing s.th. about the actual topic): -Use of vague, exaggerated or untestable claims -Over-reliance on confirmation rather than refutation -Lack of openness to testing by other experts -Absence of progress -Personalization of issues -Use of misleading languag...
by oxodoes
Sun Apr 11, 2010 8:18 pm
Forum: The Accelerator
Topic: LHC Cycle Info
Replies: 11
Views: 4991

Re: LHC Cycle Info

pixelmasseuse wrote:any clues on deciphering the SPS Visitar pages?
The vertical line gives the current position in the cycle. The blue line is proton intensity, the white line magnetic field strength (beam energy). I am not sure about the yellow line...
by oxodoes
Thu Apr 08, 2010 3:03 pm
Forum: End Of The World
Topic: The CERN safety study
Replies: 54
Views: 51403

Re: The CERN safety study

Chelle you seem to be refering to analogies that have been constructed to make an otherwise practically not understandable process graspable. Yet without the underlying physics (math), which most of us do not understand (myself included), they are wothless and quickly lead to wrong conclusions.
by oxodoes
Thu Apr 08, 2010 11:31 am
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 134217

Re: Current Events Discussion

Ok. So what about the following scenario: The LHC is filled to its design specification (2808 bunches at 7TeV) and now a kicker magnet experiences a malfunction (not just an asynchronous dump, but the magnet is not available at all, we have seen this happening for example in the SPS). Will the colli...
by oxodoes
Thu Apr 08, 2010 8:20 am
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 134217

Re: Current Events Discussion

The collimators are designed to gradually absorb the nominal beam energy (nearly 3000 bunches per beam at 7 TeV) in the case of a dump malfunction. Edit: I came to this conclusion after reading this page: http://www.lhc-facts.ch/index.php?page=kollimator (in German), the LHC collimator page sadly is...
by oxodoes
Wed Apr 07, 2010 8:33 pm
Forum: Science
Topic: Let's go hump hunting!
Replies: 86
Views: 33287

Re: Let's go hump hunting!

Josch222: You might want to read this thread first: http://lhcportal.com/Forum/viewtopic.php?f=4&t=219

The shape of the beam is an ellipse of changing orientation and size that is centered around the orbit, which is not necessarily the mechanical axis.
by oxodoes
Wed Apr 07, 2010 4:44 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 134217

Re: Current Events Discussion

Yes the beam was lost! But this happens rather often and you will get used to it very soon ;) . Tune refers to the number of transversal oscillations of the beam envelope during one turn in the machine. (The tune is vitaly important for the stability of the beam as there might be resonances.) Dump m...
by oxodoes
Thu Mar 25, 2010 1:46 pm
Forum: The Accelerator
Topic: What is the collimator?
Replies: 5
Views: 3944

Re: What is the collimator?

The collimators scrape away particles that have gone slightly off track in order to prevent damages to the beam pipe and the magnets (a small fraction of the beam hitting a magnet might for example cause a quench http://lhc-collimation-project.web.cern.ch/lhc-collimation-project/lhc_collimation__int...
by oxodoes
Tue Mar 23, 2010 11:46 pm
Forum: The Accelerator
Topic: Accelerator magnet models
Replies: 3
Views: 2674

Re: Accelerator magnet models

good work serych!
by oxodoes
Tue Mar 23, 2010 11:33 am
Forum: The Accelerator
Topic: Proton vs Graphite
Replies: 44
Views: 10060

Re: Proton vs Graphite

It's all in the LHC safety report http://lsag.web.cern.ch/lsag/LSAG-Report.pdf : Proton-proton collisions are foreseen at an energy of 7 TeV per beam. An equivalent energy in the centre of mass would be obtained in the collision of a cosmic-ray proton with a fixed target such as the Earth or some ot...
by oxodoes
Mon Mar 22, 2010 9:48 am
Forum: MoEDAL
Topic: New experiment is coming online at the LHC
Replies: 7
Views: 13327

Re: New experiment is coming online at the LHC

Sort of reminds me of the good old nuclear emulsion...
by oxodoes
Sun Mar 21, 2010 10:58 pm
Forum: The Accelerator
Topic: Intensities
Replies: 6
Views: 2477

Re: Intensities

See here:Image

The encircled value is wrong compared to the chart and the values on LHC_OP and is showing a rather random behaviour. When B1 is in the same is true for the associated value.
by oxodoes
Sun Mar 21, 2010 10:41 pm
Forum: The Accelerator
Topic: 2010 Briefings, Schedules and Problems
Replies: 48
Views: 15124

Re: 2010 Briefings, Schedules and Problems

Measuring emittance, tunes, betatron oscillation, orbits, chromacity and so on. All of these can be manipulated by the magnets. Find out more about acclerator science here: http://indico.cern.ch/scripts/SSLPdispl ... &nbweeks=7
by oxodoes
Sun Mar 21, 2010 10:30 pm
Forum: The Accelerator
Topic: Proton vs Graphite
Replies: 44
Views: 10060

Re: Proton vs Graphite

See here: http://www-bd.fnal.gov/public/relativity.html and keep in mind that the center of mass energy is the energy that can go into the creation of new particles.