Search found 38 matches

by andrewp
Wed Jun 13, 2018 7:45 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 63
Views: 3604

Re: 2018 Operation

Ah OK tnx. MD currently...
by andrewp
Tue Jun 12, 2018 5:09 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 63
Views: 3604

Re: 2018 Operation

22:32 to 23:55 I believe?
by andrewp
Sun Jun 10, 2018 9:59 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 63
Views: 3604

Re: 2018 Operation

New switchover record! Run #6773->6774 took 1h23m !! (dump->SB).
Good lumi too, so we shall see...
by andrewp
Sat Jun 09, 2018 4:42 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 63
Views: 3604

Re: 2018 Operation

Looks like the current run (#6675) will smash all previous LHC records for sustainable integrated lumi per 24 hour period - at least 1/fb. :dance: Notionally this consists of 2 switchovers (time of dump to time of next stable beams) and 2 runs. The switchovers can be 2 hours each and the runs can b...
by andrewp
Sun Jun 03, 2018 5:49 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 63
Views: 3604

Re: 2018 Operation

There have since been a raft of subsequent faults, all different in nature. The latest is a pair of cryo failures.
by andrewp
Sun May 20, 2018 6:05 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 63
Views: 3604

Re: 2018 Operation

16L2 wreaking havoc once more. Maybe clean it out for good?
by andrewp
Thu May 17, 2018 9:15 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 63
Views: 3604

Re: 2018 Operation

I raise my beer to the unsung Operator heroes!
by andrewp
Tue May 15, 2018 9:22 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 63
Views: 3604

Re: 2018 Operation

I thought they'd fixed 16L2 by removing a bunch of frozen air during the shutdown. What's the theory about the nature of the 16L2 UFO?
by andrewp
Tue May 15, 2018 10:11 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 63
Views: 3604

Re: 2018 Operation

What's the highest energy particle that can be discovered currently? (assuming such a beast exists). Is it in fact 13 TeV?
by andrewp
Mon May 14, 2018 7:06 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 63
Views: 3604

Re: 2018 Operation

Yes, the machine is purring along on song now. Clearly there's an optimal run time for average delivered lumi per time period, which depends on the switchover duration and on the decay exponent coefficient. I suspect that, with 2 hour switchovers, 13+ hours is somewhat too long.
by andrewp
Sat May 12, 2018 10:09 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 63
Views: 3604

Re: 2018 Operation

Looks like the current run (#6675) will smash all previous LHC records for sustainable integrated lumi per 24 hour period - at least 1.0 1/fb. :dance: Notionally this consists of 2 switchovers (time of dump to time of next stable beams) and 2 runs. The switchovers can be 2 hours each and the runs ca...
by andrewp
Thu May 10, 2018 5:20 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 63
Views: 3604

Re: 2018 Operation

Thanks so much for the exquisite detail. As a rank amateur I noticed that the peak initial lumi had been dialled back after 3 abortive starts at 2556b. Seems like starting with >20,000 lumi is a no-no, even though achievable.
by andrewp
Sun May 06, 2018 10:49 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 63
Views: 3604

Re: 2018 Operation

t(SB) or the current stable beams duration is DIFFERENT on the Page 1 display and the Dashboard display (currently 10:10 hrs on Page1, 11:xx on Dashboard). Fixable? Which is correct?
by andrewp
Mon May 16, 2016 10:55 pm
Forum: The Accelerator
Topic: 2016 operation
Replies: 52
Views: 5318

2016 operation

Why is it taking so darned long to get to the maximum intensity? With 900 bunches as currently, that's only about 25% of the max possible. Put another way, each physics run could return four times more data at max intensity. So what's the hold up?
by andrewp
Mon Apr 18, 2016 5:31 pm
Forum: The Accelerator
Topic: 2014 machine commissioning and 2015 start up
Replies: 59
Views: 54378

Re: 2014 machine commissioning and 2015 start up

Rampy McRampface