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LHC Machine Status Report. Steve Myers For the LHC team. Reminder of 2012 Priorities. Pile up and 25ns. The LHC machine must produce enough integrated luminosity to allow ATLAS and CMS to independently discover the Higgs before the start of LS1. - PowerPoint PPT Presentation
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LHC Machine Status Report
Steve Myers
For the LHC team
Reminder of 2012 Priorities1. The LHC machine must produce enough
integrated luminosity to allow ATLAS and CMS to independently discover the Higgs before the start of LS1.
2. We must also prepare for the proton-lead ion run at the end of the year.
3. We must (in 2012) do the necessary machine experiments to allow high energy, useful high luminosity running after LS1.
Pile up and 25ns
December 5, 2012 LHCC 111S. Myers
At the last LHCC
December 5, 2012 LHCC 111 S. Myers
November 27, 2012 S. Myers, STOA, Brussels 4
A few weeks later
4th July: Melbourne
Proton Physics run extended by 2.5 months
p-Pb Collisions in ALICE, ATLAS, CMS, LHCb
September 17, 2012 5
ALICE event display 26 -2 -1
All experiments had0.5-1 10 cm sL
LHCf, TOTEM will join for main run in January.Luminosity remains uncertain. Hope to gain factor 500-1000 and integrate 20-30 nb-1
S. Myers SPC
Collision 1000 m beta*
S. Myers SPC 6September 17, 2012
07:00 Collisions at ALPHA, about 1 Hz
Today
December 5, 2012 LHCC 111 S. Myers
Last 3 years
December 5, 2012 LHCC 111 S. Myers
This Year
December 5, 2012 LHCC 111 S. Myers
With the modified schedule
December 5, 2012 LHCC 111 S. Myers
To be done before the end of 2012• Produce Integrated Luminosity• 25 ns tests
• Electron cloud and vacuum (scrubbing)• Crossing angle, aperture, beam-beam, min β*• Maximum pile up?• UFOs• HOM heating
• Comparison 25 vs 50 ns• β* levelling testing
October 29, 2012 S. Myers, RRB 11
Will need some physics running
New MKI8
Well advanced in MD
September 17, 2012 S. Myers SPC 12
FUTURE
LS1 then operation around 7TeV/beam
LS1 Work
• Repair defectuous interconnects• Consolidate all interconnects with new design• Finish off pressure release valves (DN200)• Bring all necessary equipment up to the level
needed for 7TeV/beam
September 17, 2012 13S. Myers SPC
Linear schedule
EDMS 1227656 (rev1.0, July 26th, 2012)No contingencySeptember 17, 2012 S. Myers SPC 14
Then operation at 6.5TeV per beam
Assumptions• E=6.5TeV• β* = 0.5m (maybe 0.4m)• All other conditions as in 2012 i.e. no
improvement (yet ??) in injector brightness, LHC availability same etc
September 17, 2012 15S. Myers SPC
Comparing pile up and integrated luminosity for 25ns and 50ns with levelling
October 29, 2012 S. Myers, RRB 16
0.00 5.00 10.00 15.00 20.00 25.000.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Peak Luminosities (E34)
L25 peak var tau
L50 var tau
L50 levelled
Linst (25) set =
8.00E+33
1.00E+34
Linst (50) set = 7.3599tauL=
1slope tau=
September 17, 2012 S. Myers SPC 17
0.00 5.00 10.00 15.00 20.00 25.00 30.000.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
45.00
mu 25 mu50
Even
t Pile
UP
Duration of Fill (hours)Duration of Fill (hours)
7.3599tauL=
1slope tau=Linst (25) set =
8.00E+33
1.00E+34
Linst (50) set =
Event Pile Up (During Fill)
September 17, 2012 S. Myers SPC 18
0.00 5.00 10.00 15.00 20.00 25.000.50
0.60
0.70
0.80
0.90
1.00
1.10
1.20
1.30
1.40
1.50
Integrated Ratio 50 to 25 ns
Duration of Fill (hours)
7.3599tauL=
1slope tau=Linst (25) set =
8.00E+33
1.00E+34
Linst (50) set =
September 17, 2012 S. Myers SPC 19
0.00 5.00 10.00 15.00 20.00 25.000.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Peak Luminosities (E34)
L25 peak var tau
L50 var tau
L50 levelled
Linst (25) set =
1.00E+34
1.00E+34
Linst (50) set = 7.3599tauL=
1slope tau=
September 17, 2012 S. Myers SPC 20
0.00 5.00 10.00 15.00 20.00 25.00 30.000.00
10.00
20.00
30.00
40.00
50.00
60.00
mu 25 mu50
Even
t Pile
UP
Duration of Fill (hours)Duration of Fill (hours)
7.3599tauL=
1slope tau=Linst (25) set =
1.00E+34
1.00E+34
Linst (50) set =
Event Pile Up (During Fill)
September 17, 2012 S. Myers SPC 21
0.00 5.00 10.00 15.00 20.00 25.000.50
0.60
0.70
0.80
0.90
1.00
1.10
1.20
1.30
1.40
1.50
Integrated Ratio 50 to 25 ns
Duration of Fill (hours)
7.3599tauL=
1slope tau=Linst (25) set =
1.00E+34
1.00E+34
Linst (50) set =
September 17, 2012 S. Myers SPC 22
Summary• Integrated luminosity goal for 2012 exceeded• “Higgs” discovered• Proton-lead run in excellent shape (some
published results already)• LS1 plans in good shape (? Quadrupole diodes)
• Operation after LS1– 25ns: injector brightness, e-cloud, HOM, beam-
beam related, UFOs (machine studies sooon)– 50ns: β* levelling (maximum permissible pile up)
October 29, 2012 S. Myers, RRB 23
Thank you for your attention
December 5, 2012 LHCC 111 S. Myers
September 17, 2012 S. Myers SPC 25
SPARES
November 27, 2012 26S. Myers, STOA, Brussels
1983: Preliminary Performance Estimates for the LHC (S.Myers and W. Schnell, 11th April 1983)
1984: Kick off meeting to discuss ideas for an accelerator to collide protons at very high energy
1996: Final decision for the LHC, the most complex scientific instrument ever constructed
10 September 2008: Start of commissioning with beam 19 September 2008: Serious incident and damage 19 November 2009: Restart of beam operation December 2009: first collisions at 2.38 TeV
Today: successful operation, providing millions of particle collisions for the LHC experiments
About 2035: The LHC physics programme to be finished ?
A >50 Years Adventure
The LHC Life cycle
September 17, 2012 28
6.5TeV: 25ns
6.5Tev: 25 nsβ* = 0.5m148 days of physics
Lpeak ~7.5E33µ = ~17
Days since start of 2015 run
Optimistic• Possible intensity limitation• Possible limitation to β*• More scrubbing needed• E-cloud• UFOs• HOM heating?
S. Myers SPC
6.5TeV per beam with 50ns
6.5Tev: 50 nsβ* = 0.5m148 days of physics
Lpeak ~10.5E33µ = ~50
September 17, 2012 S. Myers SPC 29
Days since start of 2015 run
0.00 5.00 10.00 15.00 20.00 25.000.0
100.0
200.0
300.0
400.0
500.0
600.0
700.0
Integrated Luminosity
Int25 Lumi (pb-1)
Int50 Lumi (pb-1)
7.3599tauL=
1slope tau=
Duration of Fill (hours)
Linst (25) set =
8.00E+33
1.00E+34
Linst (50) set =
September 17, 2012 S. Myers SPC 30
0.00 5.00 10.00 15.00 20.00 25.000.0
100.0
200.0
300.0
400.0
500.0
600.0
700.0
Integrated Luminosity
Int25 Lumi (pb-1)
Int50 Lumi (pb-1)
7.3599tauL=
1slope tau=
Duration of Fill (hours)
Linst (25) set =
1.00E+34
1.00E+34
Linst (50) set =
September 17, 2012 S. Myers SPC 31