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