Search found 42 matches

by JNW
Tue Mar 30, 2010 1:15 am
Forum: Science
Topic: higher levels in nature question
Replies: 8
Views: 3187

Re: higher levels in nature question

The ultra high energy cosmic rays that people compare the LHC to are from outside the solar system. In fact, the highest energy ones seem to be coming from galaxies with active nuclei.
by JNW
Mon Mar 29, 2010 4:43 pm
Forum: The Accelerator
Topic: Another record !
Replies: 3
Views: 1715

Re: Another record !

Xymox wrote:I saw a 1.5E10 2x2 ramped...
Was that on fill number 1000?
by JNW
Mon Mar 22, 2010 5:02 am
Forum: The Accelerator
Topic: Proton vs Graphite
Replies: 44
Views: 8994

Re: Proton vs Graphite

When colliding a high energy relativistic proton at a stationary proton, the center-of-mass energy goes approximately as the square root of the energy of the moving proton. You need a hundred times as much energy to get ten times as much energy in the center-of-mass frame. A 3.5TeV proton hitting a ...
by JNW
Sat Mar 20, 2010 2:24 am
Forum: The Accelerator
Topic: Older Events and discussion 3/22/10
Replies: 156
Views: 37400

Re: ** Current Events and discussion **

By dumping the 3.5TeV beam into the graphite dump blocks, they achieved a new record 3.5TeV collision! A 3.5 TeV proton hitting a stationary proton will have only a tiny fraction of the center-of-mass energy that two 3.5 TeV protons colliding would have. So the beam dump wouldn't have any collision...
by JNW
Fri Mar 19, 2010 5:10 am
Forum: The Accelerator
Topic: Older Events and discussion 3/22/10
Replies: 156
Views: 37400

Re: ** Current Events and discussion **

There was a trip just as they reached 3.5TeV/beam and so the beams were dumped. Up to that point, though, everything looked great, and the intensities of both beams were very steady.
by JNW
Tue Mar 09, 2010 6:36 pm
Forum: Controversial topics
Topic: Several biggest errors of particle physicists.
Replies: 1135
Views: 324914

Re: Several biggest errors of particle physicists.

Except that there is a sign error here. The charged particles actually move in a circle in the opposite direction. Instead of strengthening the magnetic field, they weaken it. Look attentively at the figures above and find your error yourself, please. I looked at your figures, and with the magnetic...
by JNW
Mon Mar 08, 2010 8:45 pm
Forum: Controversial topics
Topic: Several biggest errors of particle physicists.
Replies: 1135
Views: 324914

Re: Several biggest errors of particle physicists.

I think I see what MagneticTrap is saying here. A charged particle moving in a circle will generate a magnetic field (true), and a magnetic field will cause a charged particle to move in a circle (true). Thus, the moving charged particles maintain and strengthen the magnetic field, which in turn cau...
by JNW
Thu Feb 18, 2010 5:19 pm
Forum: The Accelerator
Topic: 2010 Startup
Replies: 89
Views: 16636

Re: 2010 Startup

I see something happening on the LHC Page1 and LHC operations page. Judging from the log, it looks like some sort of dry run.
by JNW
Tue Feb 09, 2010 12:12 am
Forum: Off topic
Topic: Eye oopsie
Replies: 13
Views: 3407

Re: Eye oopsie

Take it easy and get well soon. :thumbup:
by JNW
Mon Feb 08, 2010 2:15 pm
Forum: The Accelerator
Topic: 2010 Startup
Replies: 89
Views: 16636

Re: 2010 Startup

It looks like they've got a beam circulating now (beam 1).

(Or maybe they're just simulating a beam to check the software?)
by JNW
Fri Feb 05, 2010 2:08 am
Forum: The Accelerator
Topic: 2010 Startup
Replies: 89
Views: 16636

Re: 2010 Startup

Gotta send some emails and see what shaking over at CERN. Start getting ready for a MUCH bigger event then last year... I anticipate -science- news this time. When do you think we'll get the first science results? I tried to find this out with some web searching, and it looks like the first real re...
by JNW
Sat Jan 30, 2010 4:50 pm
Forum: The Accelerator
Topic: LHC Updates
Replies: 28
Views: 7459

Re: LHC Updates

Looks like the LHC Cryo page has more green on it now: http://op-webtools.web.cern.ch/op-webtools/vistar/vistars.php?usr=LHC2 And the HCC main page has another update (30 Jan 2010): http://hcc.web.cern.ch/HCC/ The LHC is being prepared for operations at 3.5 TeV: * nQPS cables refurbishment is comple...
by JNW
Wed Jan 27, 2010 4:06 pm
Forum: The Accelerator
Topic: LHC Updates
Replies: 28
Views: 7459

Re: LHC Updates

The HCC main page updated today (27 Jan 2010) http://hcc.web.cern.ch/HCC/ : The LHC is being prepared for operations at 3.5 TeV: * nQPS cables refurbishment is completed in all sectors * ElQA HV test successfully performed on sectors 81 - 12 - 23 - 34 - 45. The test in ongoing in sector 56. Sectors ...
by JNW
Wed Jan 13, 2010 9:09 pm
Forum: The Accelerator
Topic: Temperature readings not updating!
Replies: 7
Views: 3518

Re: Temperature readings not updating!

Judging from the LHC cryogenics page, they've done sector 81 and are now working on sectors 12 and 78.
by JNW
Mon Jan 11, 2010 12:06 am
Forum: Science
Topic: Magnetic monopoles found?
Replies: 37
Views: 12476

Re: Magnetic monopoles found?

what about the last post by Shadowdraxx and the following: These particles aren't affected by the GZK limit that limits the energy of protons. How do you know that "these particles" aren't affected by the GZK limit? I was looking at the AGASA results. There were a number of cosmic rays detected tha...