Search found 86 matches

by jmayes
Wed Dec 09, 2009 5:58 am
Forum: The Accelerator
Topic: Daily Schedules and Hiccups
Replies: 41
Views: 18630

Re: Daily Schedules and Hiccups

Problems will be a daily thing forever with something this size, just jump over and read a few pages of the Tevatron log (Fermilab) and you will see with even a mature machine like that they go through the same thing constantly. At least it's just tripping circuits and not making smoke! I expect it ...
by jmayes
Wed Dec 09, 2009 3:19 am
Forum: The Accelerator
Topic: What is a "Piquet"
Replies: 7
Views: 5143

What is a "Piquet"

I read this a lot in the logs and tried to get a transition via the web but nothing makes sense. They way it's usually phrased makes me think it could mean "Supervisor" or another word for Expert or Guru.

Thankx again all for the great help!
J
by jmayes
Tue Dec 08, 2009 2:56 pm
Forum: The Accelerator
Topic: 30,000 AMPS, WOW!
Replies: 11
Views: 7317

Re: 30,000 AMPS, WOW!

This is great info!

I figured it was pretty low voltage, but Alice surprises me too @ 130v and warm.

Thankx again for the help,
J
by jmayes
Tue Dec 08, 2009 5:39 am
Forum: The Accelerator
Topic: OLDER 2/15/10 ** current events and discussion **
Replies: 54
Views: 25524

Re: ** current events and discussion **

Ya, the logs just reported B2 was down to 2 hours and they are ready to dump anytime.

J
by jmayes
Tue Dec 08, 2009 5:35 am
Forum: The Accelerator
Topic: OLDER 2/15/10 ** current events and discussion **
Replies: 54
Views: 25524

Re: ** current events and discussion **

Logs say Bucket timing is off by 83 and I see beam 2 intensity falling fairly quick, in fact beam 2 started 30e10 higher then beam 1 now is 30e10 lower. Beam 1 is staying the level. I think a dump will be soon.

J
by jmayes
Tue Dec 08, 2009 5:25 am
Forum: The Accelerator
Topic: 30,000 AMPS, WOW!
Replies: 11
Views: 7317

30,000 AMPS, WOW!

I read in the logs that the CMS magnet was ramped to 15,000 AMPS then on up to 30,000 AMPS! As an electronics engineer I see this as one huge figure. I am hoping someone in the know could tell us what the volts are on that buss so I could get a real picture of how much electricity that one magnet us...
by jmayes
Tue Dec 08, 2009 5:04 am
Forum: The Accelerator
Topic: Beams have bunches in wrong bucket; abort gap??
Replies: 10
Views: 6603

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

I think this is directly related to my Beam Crossover question in this thread http://lhcportal.com/Forum/viewtopic.php?f=4&t=142 I basically was wondering if the 2 beams (beam paths) are separated until collision is wanted, but if not and the 2 beam paths are permanently combined while in the experi...
by jmayes
Tue Dec 08, 2009 4:45 am
Forum: The Accelerator
Topic: Beam Xover questions
Replies: 11
Views: 5773

Re: Beam Xover questions

My continuing thought leads me to believe that the beams must be stacked vertically when in the experiments and not colliding as they have to cross before leaving the experiment *but* I was also under the impression that the beam is a series of bursts which would allow them to time things out to dec...
by jmayes
Tue Dec 08, 2009 3:56 am
Forum: The Accelerator
Topic: Access Question
Replies: 3
Views: 2391

Access Question

I was under the impression that the tunnel must remain locked for access while at Cyro conditions but I see repeated Access discussions in the log. Exactly how close can they get to the cold machine? Do they use suits? I thought that it took weeks before they could enter sector 3-4 after the malfunc...
by jmayes
Sun Dec 06, 2009 7:11 pm
Forum: The Accelerator
Topic: Beam Xover questions
Replies: 11
Views: 5773

Re: Beam Xover questions

Remember the LHC's predecessor, the LEP (Large Electron Positron collider) that was housed in the same tunnel, was running the two beams in the same (oval shaped) pipe. They could do this because the beams of electrons and positrons have different electric charges, so a magnetic field will force th...
by jmayes
Sun Dec 06, 2009 4:58 pm
Forum: The Accelerator
Topic: Beam Xover questions
Replies: 11
Views: 5773

Beam Xover questions

Most Magnets have 2 tubes for beams to go in both directions simultaneously, My questions is about how the cross over points work and why do I not see 2 tubes going through the experiments too, there must be some bypass system but machine experts say beam travels through the experiments all the time...