LHeC: A LEPTON-PROTON COLLIDER WITH THE LHC J.B. Dainton, Cockcroft Institute UK, Emmanuelle Perez, CE Saclay F, P. Newman, Birmingham University UK, M. Klein, F. Willeke, DESY Hamburg D

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LHeC A LEPTON-PROTON COLLIDERWITH THE LHC
J.B. Dainton, Cockcroft Institute UK,
Emmanuelle Perez, CE Saclay F, P. Newman,
Birmingham University UK, M. Klein, F. Willeke,
DESY Hamburg D
Put ICHEP no.
THE COCKCROFT INSTITUTE of ACCELERATOR SCIENCE
and TECHNOLOGY
Abstract The luminosity and collision energy of
lepton proton collisions using the LHC and a
LEP-size storage ring is explored assuming
proton-proton collisions in parallel. A model
accelerator layout demonstrates that luminosities
in the order of L1033cm-2sec-1 should be
possible.
IR DESIGN
Match flat e beam? bxp 4byp
Main parameters

• PHYSICS
• new lepton-quark physics _at_ TeV scale
• - precision resonance spectroscopy
• - precision anomalous dynamics
• low-x physics
• - dense chromodynamics ep and eA
• precision nucleon nuclear structure
• - parton densities for LHC _at_ LHC
• - protonheavy ion structure _at_ low x
• - precision chromodynamics
• - strong coupling constant
• precision photon structure
• heavy flavour in nucleons, nuclei,photon
• lepton structure
• quark structure
• discoverygt2007 LHeC LHC LC
• ep eA pp pA AA
  ee-

? Remains to design appropriate IR appropriate
e-Lattice
LEPTON LATTICE
Contraints

• beee bpep
• hourglass effect be ltsp
• e Physical aperture in IR quads
• e Dynamic aperture due to IR chromaticity
• e Beam-beam interaction sensitivity due to large
  beta

SYNCHROTRON RADIATION
BEAM-BEAM INTERACTION
8se separation
qc2mr
r10000m

• REQUIREMENTS
• Ecm1.4TeV ? Ee70GeV
• L 1033cm-2s-1
• Use of the experience at HERA
• lepton ring, to be installed above LHC
• one interaction point.
• proton-proton collisions take place
• simultaneously,
• proton beam parameters for LHeC are
• determined by the existing LHC
• parameters.

Power density at collimator
Central Beam-Beam Tune shifts
PARAMETERS
? Shorter cell than LEP desirable
Bypass around ATLAC CMS
1m long absorber
sxp sxe, syp sye
Parasitic BBI with 8se separation may be
critical ? needs further study
with L1033cm-2s-1 Npgp / eNp3.21020m-1
IR Lattice functions
e-Ring Parameters
IR MAGNETS
SC Septum Quadrupole
Beam Power 50MW loss
with Ee70GeV Ie 71mA Ne1.3 1010
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THE COCKCROFT INSTITUTE of ACCELERATOR SCIENCE
and TECHNOLOGY