Search found 75 matches

by dukwon
Sat Jun 16, 2018 9:50 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 63
Views: 4042

Re: 2018 Operation

Here's the lumi situation as of the start of MD1:
Lumi2018-model.LHCb.png
Predicted vs actual integrated lumi IP8
Lumi_20180616.png
Predicted vs actual integrated lumi IP1/5
Lumi_20180616.png (92.66 KiB) Viewed 113 times
intLumiRunAll.png
Integrated lumi over each year so far IP8
intLumiRunAll.png (14.78 KiB) Viewed 113 times
IntegratedLumiLHCbTime_Yearly.png
Integrated lumi over each year so far IP1/5
IntegratedLumiLHCbTime_Yearly.png (56.51 KiB) Viewed 113 times
by dukwon
Fri Jun 15, 2018 9:20 am
Forum: The Accelerator
Topic: Start of major civil engineering work for the HL-LHC
Replies: 1
Views: 141

Start of major civil engineering work for the HL-LHC

Press release: https://press.cern/press-releases/2018/06/major-work-starts-boost-luminosity-lhc Press conference (skip to 43:00): https://webcast.web.cern.ch/event/i735865 Background to the HL-LHC: https://press.cern/backgrounders/faq-about-high-luminosity-lhc More on the civil engineering work: htt...
by dukwon
Wed Jun 13, 2018 1:48 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 63
Views: 4042

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: 63
Views: 4042

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: 63
Views: 4042

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: 63
Views: 4042

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: 63
Views: 4042

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: 4
Views: 292

Re: Hey all

Welcome!
by dukwon
Mon Jun 04, 2018 11:11 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 63
Views: 4042

Re: 2018 Operation

gruffalo.png
gruffalo.png (168.8 KiB) Viewed 489 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: 119

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: 164

Re: Squeeze during ramp

by dukwon
Mon May 21, 2018 6:35 am
Forum: The Accelerator
Topic: Looking ahead to LS2 and Run 3
Replies: 2
Views: 172

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: 63
Views: 4042

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: 63
Views: 4042

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: 63
Views: 4042

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...