Abstracts Brochure - CERN

MOPLS058
MOPLS059
MOPLS060
26-Jun-06 16:00 - 18:00 MOPLS — Poster Session
eRHIC - Future Machine for Experiments on Electron-ion Collisions
V. Ptitsyn, J. Beebe-Wang, I. Ben-Zvi, A.V. Fedotov, W. Fischer,
V. Litvinenko, W.W. MacKay, C. Montag, S. Ozaki, T. Roser, S.
Tepikian, D. Trbojevic (BNL) D.P. Barber (DESY) A. Deshpande
(Stony Brook University) M. Farkhondeh, W.A. Franklin, R. Milner,
B. Surrow, C. Tschalaer, E. Tsentalovich, D. Wang, F. Wang,
A. Zolfaghari, T. Zwart, J. van der Laan (MIT) A.V. Otboev, Y.M.
Shatunov (BINP SB RAS) E. Pozdeyev (Jefferson Lab)
124
The paper presents recent developments for
the design of the high luminosity electronion
collider, eRHIC, proposed on the basis of
the existing RHIC machine. The goal of eR-
HIC is to provide collisions of electrons and
positrons on ions and protons in the centerof-mass
energy range from 30 to 100 GeV.
Lepton beams as well as the beam of protons
(and, possibly, light ions) should be polar-
ized. Two independent designs are under development, the so-called ’ring-ring’ and ’linac-ring’ options. The ’ringring’
option is based on a 10 GeV electron storage ring. The design issues for the ’ring-ring’ option are similar to
those at existing B-factories. In the ’linac-ring’ option, the electron beam is accelerated in a 10 GeV recirculating
energy recovery linac. This option may provide higher luminosities (> 1·10 33 cm-2s-1 for e-p collisions), but requires
considerable R&D studies for a high current electron polarized source. In order to maximize the collider luminosity,
ion ring upgrades, such as electron cooling and ion beam intensity increase, are considered.
The Probe Beam Linac in CTF3
A. Mosnier, M. Authier, D. Bogard, A. Curtoni, O. Delferriere, M.
Desmons, G. Dispau, R. Duperrier, W. Farabolini, P. Girardot, M.
Jablonka, J.L. Jannin, M. Luong (CEA) N. Rouvière (IPN) R. Roux
(LAL)
The test facility CTF3, presently under construction
at CERN within an international
collaboration, is aimed at demonstrating the
key feasibility issues of the multi-TeV linear
collider CLIC. The objective of the probe
beam linac is to "mimic" the main beam of
CLIC in order to measure precisely the performances of the 30 GHz CLIC accelerating structures. In order to meet the
required parameters of this 200 MeV probe beam, in terms of emittance, energy spread and bunch-length, the most
advanced techniques have been considered: laser triggered photo-injector, velocity bunching, beam-loading compensation,
RF pulse compression . . . The final layout is described, and the selection criteria and the beam dynamics
results are reviewed.
Design of an Interaction Region with Head-on Collisions at the ILC
J. Payet, O. Napoly, C. Rippon (CEA) D.A.-K. Angal-Kalinin, F.
Jackson (CCLRC/DL/ASTeC) R. Appleby (UMAN) P. Bambade, X.
Dadoun (LAL) L. Keller, A. Seryi (SLAC)
An interaction region with head-on collisions
is considered an alternative to the baseline
configuration of the International Linear Collider,
including two interaction regions with
finite crossing-angles (2 and 20 mrad). Al-
though more challenging from the point of view of the beam extraction, the head-on scheme is favoured by the
experiments because it allows a more convenient detector configuration, particularly in the forward region. The
optics of the head-on extraction is revisited by separating the e + and e − beams horizontally, first by electrostatic separators
operated at their LEP nominal field and then using a defocusing quadrupole of the final focus beam line. In
this way the septum magnet is protected from the beamstrahlung power. Newly optimized final focus and extraction
optics are presented, including a first look at post-collision diagnostics. The influence of parasitic collisions is shown