Search found 567 matches

by Kasuha
Sat Mar 27, 2010 6:06 am
Forum: The Accelerator
Topic: Vacuum
Replies: 11
Views: 3590

Re: Vacuum

Not all of the beam pipe is cooled to 1.9K - the pipe does not need it only magnets and power lines do. Other parts which don't strictly require such low temperature are held above it. There's also good overview of LHC vacuum system in LHC design report: https://edms.cern.ch/file/445860/3/Vol_1_Chap...
by Kasuha
Fri Mar 26, 2010 11:27 am
Forum: Controversial topics
Topic: Anti LHC, already proven wrong?
Replies: 23
Views: 6794

Re: Anti LHC, already proven wrong?

The matter is, they cannot ever be really proven wrong. They don't stand behind their threats, the moment you disprove one they come with another. And their approach is always the same: "We say your machine is dangerous and You prove us it isn't" They come with theory that you can create miniature b...
by Kasuha
Fri Mar 26, 2010 8:56 am
Forum: The Accelerator
Topic: Interesting development - short circuit in SPS
Replies: 16
Views: 4962

Re: Interesting development - short circuit in SPS

Looking at pictures produced by LHC's beam, I think electrons can do much better job

Protons:

Image

Electrons:

Image

:D
by Kasuha
Fri Mar 26, 2010 8:50 am
Forum: The Accelerator
Topic: Proton vs Graphite
Replies: 44
Views: 9047

Re: Proton vs Graphite

If you jump from third floor to an empty container, your potential energy is transferred to kinetic energy (during flight) and then to thermal energy (on impact). Plus you get hut badly because your collision energy is great. If you jump from third floor to a container full of plastic foam, the tran...
by Kasuha
Fri Mar 26, 2010 8:42 am
Forum: The Accelerator
Topic: Interesting development - short circuit in SPS
Replies: 16
Views: 4962

Re: Interesting development - short circuit in SPS

In fact, most of us got rid of particle accelerators in our homes already. Any CRT screen is one.
by Kasuha
Fri Mar 26, 2010 8:38 am
Forum: The Accelerator
Topic: What is the collimator?
Replies: 5
Views: 3703

Re: What is the collimator?

They wouldn't have much of the beam left soon if they were squeezing it just with collimator jaws. They act more like sandpaper, making the beam less 'hairy'. Plus, squeezing is a special process aimed at having the beam as narrow as possible in the collision area which means it will defocus again b...
by Kasuha
Thu Mar 25, 2010 6:22 pm
Forum: Controversial topics
Topic: Review of Long-Term Black Hole Risks
Replies: 56
Views: 12706

Re: Review of Black Hole Risks

CharmQuark wrote:E=cm^2
Is that about photovoltaics? :D
by Kasuha
Thu Mar 25, 2010 4:05 pm
Forum: The Accelerator
Topic: 2010 Briefings, Schedules and Problems
Replies: 48
Views: 13949

Re: 2010 Briefings, Schedules and Problems

But have the beams interacted at any point yet? I remember last year that it did and they got some colissions before they expected because the beams were interacting with each other it and then it leaked out to the public. No, they're loading proton bunches in a way which does not allow them to mee...
by Kasuha
Thu Mar 25, 2010 3:30 pm
Forum: The Accelerator
Topic: 2010 Briefings, Schedules and Problems
Replies: 48
Views: 13949

Re: 2010 Briefings, Schedules and Problems

They are actually saying it might happen. "The LHC is not a turnkey machine," said CERN director general Rolf-Dieter Heuer. "The machine is working well, but we're still very much in a commissioning phase and we have to recognize that the first attempt to collide is precisely that. It may take hours...
by Kasuha
Wed Mar 24, 2010 10:53 am
Forum: The Accelerator
Topic: 10 Bunches ??
Replies: 7
Views: 2279

Re: 10 Bunches ??

They are apparently using lower per-bunch intensities to avoid damage in case of malfunction - total intensity was hardly three times of single bunch they are normally using. I believe they were planning 16x16 collisions last year but they did not succeed to fill it. They were doing 4x4 fills regula...
by Kasuha
Wed Mar 24, 2010 9:44 am
Forum: The Accelerator
Topic: Proton vs Graphite
Replies: 44
Views: 9047

Re: Proton vs Graphite

The proton hits a whole mess of Styrofoam plates till its lost all its energy ? Basically yes. The dump block still gets pretty heavy kinetic impulse from the beam. It does not simply transfer all its energy in its first collision ? Depends on what you consider transfer of energy. When the proton i...
by Kasuha
Tue Mar 23, 2010 8:23 pm
Forum: The Accelerator
Topic: Proton vs Graphite
Replies: 44
Views: 9047

Re: Proton vs Graphite

BUT its the relativistic part that is really my problem obviously. Everything else makes perfect sense. I just dont understand how something going REALLY REALLY fast has less impact energy then what you would expect. I guess it's the 'relative' part rather than relativistic. I'll try a few more exa...
by Kasuha
Tue Mar 23, 2010 2:09 pm
Forum: The Accelerator
Topic: Rock stable beams
Replies: 3
Views: 1775

Rock stable beams

I can't help it, but it looks like LHC guys achieved rock stable beams - there is no visible decrease in intensity for over hour and half - even through ramp!
Good job!
by Kasuha
Tue Mar 23, 2010 8:44 am
Forum: The Accelerator
Topic: Proton vs Graphite
Replies: 44
Views: 9047

Re: Proton vs Graphite

Regarding center of mass energy, imagine a grain of sand suspended in space compared to grain of sand mounted to a steel plate. When you hit both by a bullet, the suspended one will probably survive as it will just bounce or stick to the bullet, while the one mounted to a wall will get shattered. Ca...
by Kasuha
Mon Mar 22, 2010 3:07 pm
Forum: Controversial topics
Topic: Review of Long-Term Black Hole Risks
Replies: 56
Views: 12706

Re: Review of Black Hole Risks

I fail to see how survivability of neutron stars can affect safety of LHC. Neutron stars and white dwarfs are the main objects being used to demonstrate the safety of the LHC by physicists. The rest of your post just doesn't make sense, as CERN scientists were the first ones to bring up this argume...