Search found 168 matches

by mfb
Thu Jun 02, 2016 11:21 am
Forum: Science
Topic: possible answer for the mass of the new LHC particle
Replies: 3
Views: 5412

Re: possible answer for the mass of the new LHC particle

The chance to have an integer multiple of a heavy standard model particle, within the experimental uncertainties, is close to 1. If you think you have something interesting publish it, and see what happens. Here is my prediction: It won't even get through the arXiv crackpot filtering process, which ...
by mfb
Tue May 24, 2016 9:39 pm
Forum: The Accelerator
Topic: Other examples of bad luck?
Replies: 2
Views: 2116

Re: Other examples of bad luck?

The 2008 magnet incident brought it to a halt for a year, and lowered its energy for further 6 years. The magnets of one ring segment needed more training than expected to reach 6.5 TeV, leading to some delay in 2015 (but hard to quantify as it happened together with other activities). If everything...
by mfb
Tue May 24, 2016 9:33 pm
Forum: Off topic
Topic: where can I report users?
Replies: 4
Views: 6878

Re: where can I report users?

In the lower right corner in every post there is a "report post" icon. I reported posts of this user/spambot already, I guess it will be gone as soon as the admin checks the forum.
by mfb
Sat May 21, 2016 12:59 pm
Forum: Science
Topic: new particle with 750 GeV
Replies: 12
Views: 9387

Re: new particle with 750 GeV

Do the 300 new articles which will explain the new particle all predict the mass and so on? No, but all those theories still allow to calculate everything in the standard model, they are checked against muon and electron g-2 measurements and so on. What does your approach predict for g-2 measuremen...
by mfb
Sat May 21, 2016 11:16 am
Forum: The Accelerator
Topic: What are the current records for LHC fills?
Replies: 45
Views: 29480

Re: What are the current records for LHC fills?

Now we are at nearly 33 hours. 4:35 -> at least 13:21 (+1d). ATLAS/CMS luminosity dropped to 1350 Hz/µb (from initially 3500), LHCb luminosity starts to drop as well (175 -> 163). 260/pb and 21/pb integrated luminosity respectively. Long beyond the point where refilling would be better for luminosit...
by mfb
Sat May 21, 2016 11:14 am
Forum: Science
Topic: new particle with 750 GeV
Replies: 12
Views: 9387

Re: new particle with 750 GeV

It describes the dark energie,the dark matter the 3 generations and predicts a new particle
which i think that it is the new particle which was found on LHC.
As long as it does not make any quantitative prediction, it is completely useless.
by mfb
Sat May 21, 2016 12:15 am
Forum: Science
Topic: new particle with 750 GeV
Replies: 12
Views: 9387

Re: new particle with 750 GeV

"published". When do we see it in a peer-reviewed journal? Or at least on arXiv?

Where is any quantitative prediction? Or at least a calculation of values that got measured already?
And why the heck do you "cite" pop-science articles?
by mfb
Sat May 21, 2016 12:12 am
Forum: The Accelerator
Topic: 2016 operation
Replies: 52
Views: 29697

Re: 2016 operation

I believe they are slowly building up to full intensity. This is what they usually do after a shutdown. They incrementally increase the number of bunches they are running with, run like that for a while, then they all sit down and check whether they are happy with how its gone and that they're happ...
by mfb
Sat May 21, 2016 12:06 am
Forum: The Accelerator
Topic: What are the current records for LHC fills?
Replies: 45
Views: 29480

Re: What are the current records for LHC fills?

Nearly 200/pb so far in 21 hours. Would be interesting to see what happens after 30+ hours. Lumi dropped from ~35% to ~18% design value so far.
by mfb
Thu May 12, 2016 11:45 pm
Forum: The Accelerator
Topic: has anyone heard the joke about the weasel and the collider?
Replies: 5
Views: 7179

Re: has anyone heard the joke about the weasel and the colli

Not a joke, unfortunately, but the LHC is back running again.
by mfb
Wed Apr 27, 2016 12:39 pm
Forum: The Accelerator
Topic: Is there machine development during beam commissioning?
Replies: 6
Views: 3484

Re: Is there machine development during beam commissioning?

Yes they were.

Pileup was already significant. The low luminosity was mainly from the low number of colliding bunches (2 and 8), and LHCb and ALICE needed lumi leveling.
by mfb
Mon Apr 25, 2016 11:33 am
Forum: The Accelerator
Topic: Is there machine development during beam commissioning?
Replies: 6
Views: 3484

Re: Is there machine development during beam commissioning?

Update: We had the first stable beams over the weekend, a bit earlier than planned. First 3, then 12 bunches, so the luminosity was tiny (0.05% to 0.35% of the design value), but it also means scrubbing starts today, 3 days earlier than planned.
by mfb
Tue Apr 19, 2016 5:23 pm
Forum: The Accelerator
Topic: Is there machine development during beam commissioning?
Replies: 6
Views: 3484

Re: Is there machine development during beam commissioning?

Do you work on the LHC by any chance? Not on the machine, but for one of the experiments. Since they're aiming to run at 40cm this year, I'd expect them to match last year's performance within two-three weeks; reaching twice the performance after six weeks. This should then give a performance avera...
by mfb
Fri Apr 15, 2016 6:38 pm
Forum: The Accelerator
Topic: Is there machine development during beam commissioning?
Replies: 6
Views: 3484

Re: Is there machine development during beam commissioning?

It is even a step earlier than that. Commissioning brings the machine back to a point where beams with a low number of bunches can safely be injected, ramped up, squeezed and collided. Over the winter shutdowns, various components could have failed, or changed their parameters slightly. The machine ...
by mfb
Fri Apr 15, 2016 6:31 pm
Forum: The Accelerator
Topic: LHC logbook access
Replies: 7
Views: 5363

Re: LHC logbook access

The request page linked above still exists, they can probably help you there.
Does your CERN lightweight account still work?

I can access the logbook, but I have a full CERN account.