Abstracts Brochure - CERN

MOPLS — Poster Session 26-Jun-06 16:00 - 18:00
DEEP-INELASTIC ELECTRON-NUCLEON SCATTERING AT THE LHC
The physics, and a design, of a Large Hadron
Electron Collider (LHeC) are sketched. With
high luminosity, 10 33 cm-2s-1, and high energy,
√ s = 1.4TeV, such a collider can be built
in which a 70GeV electron (positron) beam
F.J. Willeke (DESY) J.B. Dainton (Cockcroft Institute) M. Klein
(DESY Zeuthen) P. Newman (Birmingham University) E. Perez
(CEA)
in the LHC tunnel is in collision with one of the LHC hadron beams and which operates simultaneously with the
LHC. The LHeC makes possible deep-inelastic lepton-hadron (ep, eD and eA) scattering for momentum transfers Q2
beyond 106GeV2 and for Bjorken x down to the 10-6. New sensitivity to the existence of new states of matter, primarily
in the lepton-quark sector and in dense partonic systems, is achieved. The precision possible with an electron-hadron
experiment brings in addition crucial accuracy in the determination of hadron structure, as described in Quantum
Chromodynamics, and of parton dynamics at the TeV energy scale. The LHeC thus complements the proton-proton
and ion programmes, adds substantial new discovery potential to them, and is important for a full understanding of
physics in the LHC energy range.
Contributed to the Open Symposium on European Strategy for Particle Physics Research, LAL Orsay, France, January
30th to February 1st , 2006. hep-ex/0603016 DESY 06-00Cockcroft-06-05
QCD Explorer Proposal: E-linac versus E-ring
TeV center of mass energy lepton-hadron collider
is necessary both to clarify fundamental
aspects of strong interactions and for adequate
interpretation of the LHC data. Re-
H. Karadeniz (TAEK) S. Sultansoy (Gazi University, Faculty of Science
and Arts)
cently proposed QCD Explorer utilizes the energy advantage of the LHC proton and ion beams, which allows the
usage of relatively low energy electron beam. Two options for the LHC based ep collider are possible: construction of
a new electron ring in the LHC tunnel or construction of an e-linac tangentially to the LHC. In the latter case, which
seems more acceptable for a number of reasons, two options are under consideration for electron linac: the CLIC
technology allows shorter linac length, whereas TESLA technology gives higher luminosity.
Beam-gas and Synchrotron Radiation Backgrounds in eRHIC Interaction Region
The eRHIC facility currently under study
at BNL consists of an electron storage ring J. Beebe-Wang, C. Montag (BNL) B. Surrow (MIT)
added to the existing RHIC complex. The
interaction region of eRHIC has to provide the required low-beta focusing while accommodating the synchrotron
radiation generated by beam separation close to the interaction point. In order to protect the septum, where the
electron and ion vacuum system are separated, and minimize the backward scattering of the synchrotron radiation,
an absorber and collimation system will be employed. Beam-gas provides an additional source of background that
needs to be addressed during the design process of the eRHIC interaction region. In this paper, we first present the
overview of the current design of the eRHIC interaction region with special emphases on the synchrotron radiation
and beam-gas backgrounds. The design of the detector, absorber and collimation system, including their geometrical
and physical properties, will be described. Finally, an integrated simulation of the backward scattering of synchrotron
radiation from the absorber as well as the calculations of beam-gas background level will be presented.
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