Search found 163 matches

by dukwon
Wed Jun 13, 2018 1:48 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 231292

Re: 2018 Operation

Global Post Mortem Event Event Timestamp: 10/06/18 21:39:22.990 Fill Number: 6773 Accelerator / beam mode: PROTON PHYSICS / STABLE BEAMS Energy: 6499200 [MeV] Intensity B1/B2: 14259 / 17073 [e^10 charges] Event Category / Classification: PROGRAMMED_DUMP / MULTIPLE_SYSTEM_DUMP First BIC input Trigge...
by dukwon
Mon Jun 11, 2018 9:08 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 231292

Re: 2018 Operation

21:39 to 23:55 is 2 hours, 16 minutes. I believe the theoretical minimum turnaround time is about 1h45m.
by dukwon
Thu Jun 07, 2018 2:44 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 231292

Re: 2018 Operation

8 quenches in S34. 12–15 hours to wait for cryo recovery :(
by dukwon
Thu Jun 07, 2018 9:14 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 231292

Re: 2018 Operation

From what I've heard, it was shut down on purpose to do a special run for the liquid argon calorimeter. I'm not sure I believe that.
by dukwon
Thu Jun 07, 2018 8:52 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 231292

Re: 2018 Operation

ATLAS requested the lower lumi. I'm guessing there's little point stressing the computing resources collecting high-pileup data with the magnet off. I'll try to find out what the problem with the magnet is, although I'm sure mfb will tell us soon enough.
by dukwon
Mon Jun 04, 2018 11:11 am
Forum: New Users Start Here
Topic: Hey all
Replies: 5
Views: 21451

Re: Hey all

Welcome!
by dukwon
Mon Jun 04, 2018 11:11 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 231292

Re: 2018 Operation

gruffalo.png
gruffalo.png (168.8 KiB) Viewed 40173 times
The gruffalo with his hand on the beam dump switch
by dukwon
Thu May 24, 2018 9:27 am
Forum: Portal link and forum suggestions
Topic: Default stylesheet
Replies: 2
Views: 11042

Default stylesheet

I think the "dark and foreboding" default stylesheet is rather off-putting to new users. I humbly suggest switching to "Flat style", which is lighter and looks more modern:

by dukwon
Wed May 23, 2018 6:54 pm
Forum: The Accelerator
Topic: Squeeze during ramp
Replies: 2
Views: 11135

Re: Squeeze during ramp

by dukwon
Mon May 21, 2018 6:35 am
Forum: The Accelerator
Topic: LS2 and looking ahead to Run 3
Replies: 5
Views: 19725

Re: Looking ahead to LS2 and Run 3

The figure of 300/fb was over Runs 1 to 3 (before the HL-LHC).
by dukwon
Wed May 16, 2018 8:16 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 231292

Re: 2018 Operation

Look at the last few posts. 16L2 "woke up" and it took reduced beam intensity to get back to reliable stable beams. It was all going so well, too
by dukwon
Wed May 16, 2018 5:34 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 231292

Re: 2018 Operation

It was seen during scrubbing that the intervention to remove frozen air did not eliminate the problem. The best tactic was found to be adding bumps and restricting the current through the appropriate magnet. The working theory is still that is frozen air or similar. If there is water ice in there it...
by dukwon
Tue May 15, 2018 6:52 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 231292

Re: 2018 Operation

16L2 has returned with vengeance over the last 24 hours: 21:52 Programmed dump in stable beams to end fill 6681 22:01 to 00:09 SPS cavity trip 02:22 Back to stable beams 02:57 Dump (stable beams) 16L2 03:29 to 05:19 MKI2 fault 07:03 Dump (flat top) no reason given in logbook 10:46 Dump (ramp) 16L2 1...
by dukwon
Tue May 15, 2018 7:50 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 231292

Re: 2018 Operation

even if nothing else has been discovered since the Higgs Discovering fundamental particles shouldn't be a main criterion for success. The LHC experiments have done a lot of physics in a variety of areas. Last time I looked they have published about 2,200 papers between them. so perhaps the remainin...
by dukwon
Mon May 14, 2018 9:05 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 231292

Re: 2018 Operation

Indeed, machine availability was >95% over the weekend, with 70% in stable beams. They are starting to gradually increase the bunch intensity. Fills 6675 and 6677 peaked at over 20 Hz/nb. The turnaround from 6674 to 6675 was 1:59:47; a new record! At the average rate over the last 2 weeks, we might ...