Search found 13 matches

by terryburton
Tue Sep 12, 2017 3:40 pm
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 6218

Re: 2017 Operation

Max bunches under the new scheme is about 1920 according to the following report:

http://home.cern/cern-people/updates/20 ... tion-holes
by terryburton
Sun Jun 12, 2016 1:24 am
Forum: The Accelerator
Topic: How can the intensity be increased?
Replies: 3
Views: 608

Re: How can the intensity be increased?

You might find the following calculator interesting, especially the INPUT parameters and the formulae in the OUTPUT section: https://lpc.web.cern.ch/lpc/lumi2.html I think that this paper provides a quite accessible introduction to how each of these parameters contributes to the resulting luminosity...
by terryburton
Wed Jun 01, 2016 11:54 pm
Forum: The Accelerator
Topic: How stringent is the ~100fb for 2016-2018?
Replies: 7
Views: 890

Re: How stringent is the ~100fb for 2016-2018?

Currently at 2048b, the LHC is accumulating ~1.5fb/week for 30% stable beams which is great news, considering the lost two weeks over bad luck. If they can get to 2800 bunches, that should mean ~2fb/week bringing 25fb/year on target! At the moment they appear to be limited to 72 bunches per injecti...
by terryburton
Wed Dec 05, 2012 6:44 pm
Forum: The Accelerator
Topic: 2012 Events Discussion
Replies: 100
Views: 67020

Re: 2012 Events Discussion

For interest, a video of the latest machine status report by Steve Myers at today's 112th LHCC:

http://cdsweb.cern.ch/record/1497688
by terryburton
Mon Jun 25, 2012 8:48 pm
Forum: Science
Topic: sub-atomic particles travelling faster than light
Replies: 7
Views: 3222

Re: sub-atomic particles travelling faster than light

CharmQuark wrote:I see no reason why it shouldn't stay here Terry :thumbup:
I'm hopeful that the relocation would generate discussion rather than intending to be critical of the subject. :-)
by terryburton
Thu Jun 21, 2012 4:10 pm
Forum: Science
Topic: sub-atomic particles travelling faster than light
Replies: 7
Views: 3222

Re: sub-atomic particles travelling faster than light

I would suggest that moving this post into Other topics » Off topic or (tangentially) Other topics » Quantum Philosophy might generate discussion.
by terryburton
Thu Jun 21, 2012 3:58 pm
Forum: The Accelerator
Topic: How easy is it to switch between 25ns and 50ns operation?
Replies: 13
Views: 3949

Re: How easy is it to switch between 25ns and 50ns operation

I don't know what is going on with the injection kickers heating up. It's not an issue I've come across before and I don't know if it was expected or not. Presumably they will look at ways of addressing it in LS1. If it's related to bunch intensity then presumably it will be eased by 25 ns too. Fro...
by terryburton
Wed Jun 13, 2012 12:26 pm
Forum: The Accelerator
Topic: 2012 Events Discussion
Replies: 100
Views: 67020

Re: 2012 Events Discussion

For those with an interest...

The latest machine status report was presented at this morning's LHCC 110:

http://indico.cern.ch/getFile.py/access ... fId=194183

The video recording is expected to follow:

http://cdsweb.cern.ch/record/1455674?ln=en
by terryburton
Wed May 16, 2012 12:43 am
Forum: The Accelerator
Topic: 2012 Events Discussion
Replies: 100
Views: 67020

Re: 2012 Events Discussion

Onwards indeed... "During the stable beams, the injectors profited to fix the problem of emittance blow-up. The investigation was so proficuous that the SPS started re-measuring low emittances as before the TS and we decided to dump to refill." The current fill had initial luminosities exceeding 530...
by terryburton
Sat Oct 02, 2010 9:38 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 54561

Re: Current Events Discussion

The incidence of the UFOs does not appear to be concentrated at the location of the events of September 2008.

Source is three weeks old: http://cdsweb.cern.ch/record/1294051 (at 35 mins)
by terryburton
Sat Oct 02, 2010 10:11 am
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 54561

Re: Current Events Discussion

At the moment the machine operators believe the UFOs to be the result of dislodged dust falling through the beam. They hope that this exists as an artefact of the machine construction rather than a systematic problem and that it will be burned away by continual use so that the number of UFO events d...
by terryburton
Tue Jul 13, 2010 11:38 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 54561

Re: Current Events Discussion

Hi,

The filling schemes are detailed here:

http://lpc.web.cern.ch/lpc/fillingschemes.htm


HTH,

Tez