LHC portal

136th LHCC Meeting - Agenda OPEN Session
https://indico.cern.ch/category/3427/

Jmc

135th LHCC meeting https://indico.cern.ch/event/744723/

From page 19 there's been some cryogenic issues as far back as June and July with the failure of two compressors. These will be replaced in TS2 removing the current limitations.

Jmc

134th LHCC Meeting - Agenda OPEN Session
https://indico.cern.ch/event/726320/

Aiming for ~60\fb for 2018

JMc

Interesting; I thought the plan a few years back was to accumulate ~300\fb over run3, whereas now it seems to be little better than what's already possible ~150-200\fb

JMc

I think the aim is to achieve 150\fb in total for 2015-2018, working out at approx 60\fb for 2018, and making Run 2 a great success even if nothing else has been discovered since the Higgs. Currently averaging 4\fb/week, I can see this being achieved by the start of MD3; so perhaps the remaining tim...

The 2018 data-taking run at the LHC has begun: https://home.cern/about/updates/2018/04/2018-data-taking-run-lhc-has-begun The LHC operators will keep ramping up the number of bunches, aiming to hit 2556 bunches in total. This will help them achieve their target of 60 inverse femtobarns (fb-1) of pro...

Late February LHCC meeting: https://indico.cern.ch/event/692482/contributions/2841711/attachments/1608028/2552349/LHCC133_Machine_Status.pdf Looks as if the number of days for the p-p run has been reduced from 131 to 124 to accommodate special runs: https://beams.web.cern.ch/sites/beams.web.cern.ch/...

Schedule has been updated: https://beams.web.cern.ch/sites/beams.web.cern.ch/files/schedules/LHC_Schedule_2017.pdf It looks as if they've reallocated two weeks from the proton-proton run to 5 TeV p-p Reference & Low Energy High Beta run. Currently hitting > 3\fb/week so ~ 45\fb for the remaining 7 w...

Latest 131st LHCC meeting has 45\fb as year end target :
https://indico.cern.ch/event/658856/con ... pt2017.pdf

JMc

https://home.cern/cern-people/updates/2017/08/lhc-report-something-nothing "On the basis of current statistics, there appears to be no direct correlation between the number of bunches and the number of beam dumps, so the task force is now planning tests with beams of up to 2200 bunches (last year’s ...

So running with the current 1550b yields 0.3\fb/day = 2\fb/week at 55% efficiency giving 35 - 40\fb for 2017 which looks fine to me, bearing in mind that the hope was to accumulate > 100\fb for run 2. I don't see the point in changing the planned running parameters of the LHC significantly, just for...

Interesting... so am I right in saying that the beam can heat the pipe via inductive heating, thus releasing any frozen gas, and temporary failing of the cryogenics then adds to the problem as the frozen gas is heated? This makes sense because the problem seemed to go away for a while as they gradua...

They've moved from 144bpi to 96bpi which looks interesting... perhaps the lower bpi are more efficient in scrubbing the injectors and minimizing loses?

JMc

Does anyone know why, for the past week, they're having to slowly ramp up the intensity again?

Jmc

They were trying for increased bunch intensity, but lost the beam several times upon ramping; so I guess the scrubbing is to "clean" the beam path in the hope this will improve things.

JMc