CSP Meeting CERN CERN Accelerators in 2010 25th November 2010 Stephen Myers Director for Accelerators and Technology, CERN Geneva

Total of 9 accelerators at CERN, 12 if you consider the 4 rings of the booster

CERN CERN Accelerator Complex Lake Geneva Geneva Airport CERN LAB 2 (France) Shows only the accelerators and the lab, no other animation CERN LAB 1 (Switzerland)

CERN CERN Accelerator Complex Large Hadron Collider Lake Geneva (LHC, 2008) 27km long 150m underground Lake Geneva Geneva Airport CERN LAB 2 (France) Super Proton Synchrotron (SPS, 1976) no animation, showing the details of the accelerators Proton Synchrotron (PS, 1959) CERN LAB 1 (Switzerland)

CERN CERN Accelerator Complex Four LHC experiments: huge detectors were constructed by thousands of scientists in international collaboration CMS LHC-b ALICE ATLAS

Even Better a Da Vinci Version

The LHC

LHC: First collisions at 7 TeV on 30 March 2010 ALICE LHCb CMS

First Running Period (low bunch intensity) calculated ) > Seven Orders of magnitude below design At this point, just ahead of the ICHEP, Paris, (based on collisions at 450 GeV with 1.1e11 ppb) we decided to change mode of operation to high bunch intensity

Second Running Period (High bunch Intensity) calculated Maximum reached is 10.7x1030 cm-2s-1

28/10/2010 (approaching 50pb-1)

Running with Bunch Trains (Parameters) Performance Improvement by a factor of 200,000 in 7 months:

Peak Luminosity Update needed Goal for 2010 2010 Goal

2010 Ion Run The Injectors are ready The Pb82+ beam was injected into the LHC (first beam after the 2008 incident) The basic machine parameters are similar But the collimation system will need some setting up The behavior of the beam instrumentation will be critical – the low intensities make life difficult It will not look as impressive as protons as far as absolute performance is concerned: Peak Luminosity ~10+25 cm-2 s-1 (c.f. 2x10+32 for protons) Integrated Luminosity ~3-10 mb-1 (c.f. 50,000,000 mb-1 for protons) But each collision should look pretty impressive!

First Long Run with lead ions 8-9 Nov 2010 16 bunches/beam 4 bunches/beam

A word from our suppliers

1 bunch 4 bunches 65 bunches 121 bunches

6 days of ion operation (x 100 increase) 14 Nov 6 days of ion operation (x 100 increase) 8 Nov

Integrated Luminosity with Lead Ions

Peak Luminosity with Lead Ions

Summary: What did we learn in 2010 LHC is magnetically very reproducible on a month to month time scale Head on beam-beam limit higher than forseen Aperture better than foreseen Not a single magnet quench due to beam Careful increase of the number of bunches OK Electron cloud and vacuum Machine protection Set up is long Quench levels for fast and slow losses needs optimized UFOs

Plans for 2011 Running Conditions in 2011 (Chamonix January 2011) Maximum beam energy Bunch spacing 50/75ns Integrated luminosity evaluation (goal set is 1fb-1)

The 10 year technical Plan

Cern’s Other Accelerators SPS North Area (450 GeV Fixed target experiments and test beams) CNGS PS East area (DIRAC etc) nToF AD (?ELENA) PS Booster ISOLDE (HIE-ISOLDE) CTF3 LEIR (Low Energy Ion Ring)... Medical applications

Total of 9 accelerators at CERN, 12 if you consider the 4 rings of the booster

CERN Neutrinos to Gran Sasso Task for CERN: produce intense nm beam towards Gran Sasso p + C  (interactions)  p+, K+  (decay in flight)  m+ + nm 700 m 100 m 1000m 67 m 26 26 26

CERN to Gran Sasso : 732 km at depth up to 11.4 km 27 27 27

AD@CERN 28

Thank you for your attention

CERN Projects HL-LHC (Luminosity Upgrade) LIU (Performance upgrade of the LHC Injectors) CONS (Consolidation of LHC and Injectors) LCS (Linear Collider Studies) HIE-ISOLDE, ?ELENA, ?neutrinos R&D on High Power Proton Driver (SPL etc)

HL-LHC

Upgrades: Foreword Goals New Studies were launched more than one year ago Performance Aim To maximize the useful integrated luminosity over the lifetime of the LHC Targets set by the detectors are: 3000fb-1 (on tape) by the end of the life of the LHC → 250-300fb-1 per year in the second decade of running the LHC Goals Check the coherence of the presently considered upgrades wrt accelerator performance limitations, Detector needs, manpower resources and, shutdown planning including detectors

Luminosity Upgrade Scenario For LHC high luminosities, the luminosity lifetime becomes comparable with the turn round time  Low efficiency Preliminary estimates show that the useful integrated luminosity is greater with a peak luminosity of 5x1034 cm-2 s-1 and a longer luminosity lifetime (by luminosity levelling) than with 1035 and a luminosity lifetime of a few hours Luminosity Levelling by Beta*, crossing angle, crab cavities, and bunch length Detector physicists have indicated that their detector upgrades are significantly influenced by the choice between peak luminosities of 5x1034 and 1035. Pile up events Radiation effects

Hardware for the Upgrade New high field insertion quadrupoles Upgraded cryo system for IP1 and IP5 Upgrade of the intensity in the Injector Chain Crab Cavities to take advantage of the small beta* Single Event Upsets SC links to allow power converters to be moved to surface Misc Upgrade some correctors Re-commissioning DS quads at higher gradient Change of New Q5/Q4 (larger aperture), with new stronger corrector orbit, displacements of few magnets Larger aperture D2

Crab Cavities qc Elliptical 800 MHz not far from being designed. Require 400 mm beam-beam 400 MHz small cavity under conceptual study, they can (?) fit in 194 mm beam-beam. Required for final solution

LIU SPS PS PSB LINAC4 Electron cloud, RF upgrade, Increased energy at injection PSB Increased energy at extraction, power converters, kickers and septa ... LINAC4

HE-LHC

Preliminary HE-LHC - parameters Very Long Term Objectives: Higher Energy LHC Preliminary HE-LHC - parameters Very preliminary with large error bars

HE-LHC – main issues and R&D high-field 20-T dipole magnets based on Nb3Sn, Nb3Al, and HTS high-gradient quadrupole magnets for arc and IR fast cycling SC magnets for 1-TeV injector emittance control in regime of strong SR damping and IBS cryogenic handling of SR heat load (first analysis; looks manageable) dynamic vacuum