Search found 396 matches

by chriwi
Thu Dec 10, 2009 8:07 am
Forum: Off topic
Topic: Strange Norwegian blue spirals
Replies: 15
Views: 6243

Re: Strange Norwegian blue spirals

are you sure its not a fake?
It looks too symetric and with too much contrast.
by chriwi
Wed Dec 09, 2009 2:07 pm
Forum: The Accelerator
Topic: *** 2.36TeV collisions ***
Replies: 20
Views: 5369

Re: *** 2.36TeV collisions ***

Somewhere else in this forum someoen posted, that at this early stage the magnets are allways set up in that way that the 2 beams cross in all experiments. If that is true this means whenever they have 2 beams running there is a more or less chance of collissions also when they are only test ramping...
by chriwi
Wed Dec 09, 2009 1:16 pm
Forum: The Accelerator
Topic: Beam Xover questions
Replies: 11
Views: 3161

Re: Beam Xover questions

It probably also depends on the geometry of the experiments and the fact where is space to put the respective magnets for the crossover.
by chriwi
Tue Dec 08, 2009 10:16 am
Forum: The Accelerator
Topic: Underground webcams
Replies: 40
Views: 7560

Re: Underground webcams

I would also really like to ga there again. Especially since I live only about 500km from Cern.
by chriwi
Tue Dec 08, 2009 10:08 am
Forum: The Accelerator
Topic: Underground webcams
Replies: 40
Views: 7560

Re: Underground webcams

I don't know if there are any days like that during the years of ongoing LHC experiments. But I can tell that I was already in the tunnel of the LHC with a group from our college in 1997 when the LEP was already shut off but still installed and the constructuion of the LHC not yet started, I even to...
by chriwi
Tue Dec 08, 2009 9:55 am
Forum: Off topic
Topic: planets rotation
Replies: 5
Views: 1387

Re: planets rotation

Hello drippingwet rat, according to the well accepted theories about gavitation and centrifugal force the rotatin of the earth is not the cause of or gravitation. More the rotatin of the earth causes a slightly lower gravitatin at the equator and leaves full gravitatin at the poles. Also from this (...
by chriwi
Tue Dec 08, 2009 6:52 am
Forum: The Accelerator
Topic: 30,000 AMPS, WOW!
Replies: 11
Views: 4582

Re: 30,000 AMPS, WOW!

I did not search now, but I only want to bring back to your minds, that we are dealing with supercondukting coils here where the resitance is close to really 0 Ohm, so even for such high currents I don't expect very high voltages. That is rather like the peltierelement in the practical work of my ex...
by chriwi
Tue Dec 08, 2009 6:48 am
Forum: The Accelerator
Topic: Underground webcams
Replies: 40
Views: 7560

Re: Underground webcams

If the revolutionfrequency is really arround 11kHz and humanscannot hear much hgher frequencies (not mor than 20kHz often rather below 15kHz for adults and elders) onlyaround one period per round shoud be audible if at all. So that reminds me of the abort gap (a period in every beam where are no bun...
by chriwi
Tue Dec 08, 2009 6:39 am
Forum: The Accelerator
Topic: Beams have bunches in wrong bucket; abort gap??
Replies: 10
Views: 4084

Re: Beams have bunches in wrong bucket; abort gap??

As to my understanding (read somewhre here or in one of the cern documents linked from here) you have to imagine the bunches of protons as a big wheel rotating in the LHC (ofcorse the material is only flying protons) the buckets are just virtual positions on this wheel positioned around the circumfe...
by chriwi
Mon Dec 07, 2009 12:26 pm
Forum: The Accelerator
Topic: Underground webcams
Replies: 40
Views: 7560

Re: Underground webcams

I don't know if the sound of the phasers of startreck is so realistic (especially in vacuum), but the effect of the LHC-beam on materials or living creatures should be at least as devistating as a hand-paser (when it is not set to "nonletal-mode"(sorry if this retranslation from the German traslatio...
by chriwi
Mon Dec 07, 2009 10:33 am
Forum: The Accelerator
Topic: Beam Xover questions
Replies: 11
Views: 3161

Re: Beam Xover questions

hello jmayes, that sounds like a rather rasonable picture of whats going on only that the right time might be rather a matter of minutes than small fractions of miliseconds, as far as I understand they will pull the two beams togather for a rather long time (at least several minutes) in wich collisi...
by chriwi
Mon Dec 07, 2009 10:13 am
Forum: End Of The World
Topic: I absolutely hate this experiment
Replies: 15
Views: 7232

Re: I absolutely hate this experiment

There have benn such fireballs in all collider experiments at least of the last decade and the fireball will also be generated by cosmic particles hitting the earths atmpsphere, but they are by far not so dangerous as they sond like, evenso they become stronger with higher collision-energies the fir...
by chriwi
Fri Dec 04, 2009 7:25 am
Forum: The Accelerator
Topic: What sort of noise does the worlds largest machine make?
Replies: 11
Views: 2911

Re: What sort of noise does the worlds largest machine make?

I don't belive in "screaming particles", so we should rather ask if the detectors make a nois when they detect a particle (rather not for one but for milions of particles in one second) and that might be ratrher different for the diffrent types of detectors. The silicondetectors should be rather qui...
by chriwi
Thu Dec 03, 2009 7:10 am
Forum: New Users Start Here
Topic: TEST
Replies: 4
Views: 1784

Re: TEST

At least I can read it ;)
by chriwi
Thu Dec 03, 2009 7:03 am
Forum: The Accelerator
Topic: What sort of noise does the worlds largest machine make?
Replies: 11
Views: 2911

Re: What sort of noise does the worlds largest machine make?

By the way: are the magnets pulsed, in some way modulatet in a audible frequency or is the current rather stedy even HF? If the field of the big magnets changes with an audible frequency there should be enoug feromagnetig material arround which would make some noise even only in the stray field. Lik...