Search found 29 matches

by Tim Bergel
Mon Sep 07, 2015 6:58 pm
Forum: Portal link and forum suggestions
Topic: Portal changes
Replies: 13
Views: 11781

Re: Portal changes

Hey, its still a very useful resource that I check out most days - so don't knock yourself out if you are busy with other stuff (I know how that goes).
by Tim Bergel
Mon Jun 01, 2015 4:41 pm
Forum: The Accelerator
Topic: 2014 machine commissioning and 2015 start up
Replies: 59
Views: 51596

Re: 2014 machine commissioning and 2015 start up

Thank you for the information, Tau. Can you explain something? If 25 ns bunch separation does not allow you to have more bunches, then what does it achieve? From where I'm sitting it seems likely that 25 ns will be harder, so I assume there is an up-side...
by Tim Bergel
Sun Mar 08, 2015 6:20 pm
Forum: Portal link and forum suggestions
Topic: Portal changes
Replies: 13
Views: 11781

Re: Portal changes

Hi there, very pleased to see the beam setup appear! Looking forwards to watching the progress at 13 TeV.

But I wanted to say - the 'Statistics' link on the left doesn't work any more - page only accessible from within CERN....
by Tim Bergel
Fri Jun 15, 2012 8:43 am
Forum: The Accelerator
Topic: 2012 Events Discussion
Replies: 100
Views: 66377

Re: 2012 Events Discussion

the only beams that were kept much longer than this were kept for the reason that there was no setup beam available from the SPS at that time so dumping would have left them with nothing, not even the chance to refill.
Ah - I hadn't spotted that - thanks
by Tim Bergel
Thu Jun 14, 2012 12:13 pm
Forum: The Accelerator
Topic: 2012 Events Discussion
Replies: 100
Views: 66377

Re: 2012 Events Discussion

I've been looking at the integrated luminosity in the statistics page & there's something I don't understand. On each run the luminosity starts off pretty high and decays down so that after say 10 hours of stable beams it's about 1/3 of the initial value. I haven't tried to work out the optimal valu...
by Tim Bergel
Wed May 23, 2012 9:47 pm
Forum: The Accelerator
Topic: 2012 Events Discussion
Replies: 100
Views: 66377

Re: 2012 Events Discussion

Thank you everyone for coming up with answers to my question. Much appreciated.
by Tim Bergel
Sat May 19, 2012 9:02 am
Forum: The Accelerator
Topic: 2012 Events Discussion
Replies: 100
Views: 66377

Re: 2012 Events Discussion

Can anybody explain to me what causes the short downward blips every 100 mins or so in the luminosity trace during stable beams? At first I thought they were glitches but they seem too regular to be unintentional.

Fingers crossed but things seem to be running smoothly again. Impressive work.
by Tim Bergel
Sat Apr 14, 2012 8:07 pm
Forum: The Accelerator
Topic: 2012 Events Discussion
Replies: 100
Views: 66377

Re: 2012 Events Discussion

Everything seems to be going very smoothly ... too smoothly ...

Seriously though, is it my imagination or is it taking much less time between the end of one period of stable beams and the start of the next? The turnround only seems to take about two hours - I'm sure it used to take longer.
by Tim Bergel
Tue Aug 02, 2011 8:35 am
Forum: The Accelerator
Topic: 2011 Events Discussion
Replies: 184
Views: 31175

Re: 2011 Events Discussion

Has the schedule (as available from the portal) been revised? Unless I'm reading it incorrectly, we should be in the middle of a technical stop right now...
by Tim Bergel
Fri May 20, 2011 11:12 am
Forum: The Accelerator
Topic: Possible LHC convention!!!!
Replies: 15
Views: 7859

Re: Possible LHC convention!!!!

Not sure if any of these suggestions are reasonable or if I would be able to attend but: I would like to: 1. See the accelerator and detector hardware 2. Meet with the engineers who designed & operate the LHC & detectors to try to get a better idea of the issues involved in making it operate and wha...
by Tim Bergel
Sun Jan 02, 2011 11:36 am
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 52204

Re: Current Events Discussion

Anybody know what the schedule is for restarting operations in 2011? Will it be more ions work or will proton experiments be back?
by Tim Bergel
Thu Oct 07, 2010 10:50 am
Forum: The Accelerator
Topic: *** SQUEEZE ***
Replies: 3
Views: 1236

Re: *** SQUEEZE ***

Hi Amiso, It doesn't look like anybody else is going to have a go at explaining this so I shall have a try, but my understanding is very limited - if I get something hopelessly wrong can someone correct me. I think that, if you go to the main portal area, there is a link on the left called "Accelera...
by Tim Bergel
Thu Sep 23, 2010 5:04 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 52204

Re: Current Events Discussion

56 bunches in, ramp done and squeeze underway. Here we go... :clap:
by Tim Bergel
Tue Aug 17, 2010 9:13 am
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 52204

Re: Current Events Discussion

> And they're planning to test bunch trains too

So I see. I haven't managed to find out exactly what a bunch train is - though I can make a good guess - can anybody give me a shortish description?

And 48 bunch operations too ... very impressive steady progress.
by Tim Bergel
Wed Jul 14, 2010 11:27 am
Forum: ALICE
Topic: Alice having difficulties?
Replies: 4
Views: 2423

Alice having difficulties?

Does anybody know if ALICE is having difficulties? Recently while stable high intensity beams are circulating and all the other detectors are doing PHYSICS, ALICE always seems to be NOT READY.