Abstracts Brochure - CERN

TUPLS005
TUPLS006
TUPLS007
TUPLS008
27-Jun-06 16:00 - 18:00 TUPLS — Poster Session
Preliminary Study of Using "Pipetron"-type Magnets for a Pre-accelerator for the LHC Collider
One of the luminosity limitations of the LHC
G. De Rijk, L. Rossi (CERN) H. Piekarz (Fermilab)
is the rather low injection energy (0.45 TeV)
with respect to the collision energy (7 TeV).
The magnetic multipoles in the main dipoles at low field and their dynamic behaviour are considered to limit the
achievable bunch intensity and emittance. We report on a preliminary study to increase the injection energy to 1.5 TeV
using a two beam pre-accelerator (LHCI) in the LHC tunnel. The LHCI is based on "Pipetron" magnets as originally
proposed for the VLHC. The aim of the study is to assess the feasibility and to identify the critical processes or systems
that need to be investigated and developed to render such a machine possible.
Optics of a 1.5 TeV Injector for the LHC
A concept is being developed to install a sec-
J.A. Johnstone (Fermilab)
ond ring above the LHC to accelerate protons
from 450 GeV to 1.5 TeV prior to injection into
the LHC. The arc and dispersion suppressor optics of the LHC would be replicated in the injector using combined
function ’transmission line’ magnets orginally proposed for the VLHC. To avoid costly civil construction, in the
straight sections housing detectors at least, the injector and LHC must share beampipes and some magnets through
the detector portion of the straights. Creating the appropriate optics for these injector-LHC transition regions is very
challenging: In addition to matching to the nominal LHC lattice functions at these locations, the changes in altitude
of 1.1 m between the injector and LHC must be accomplished achromatically to avoid emittance blowup when the
beams are transferred to the LHC.
Fermilab Recycler Performance with a Dual Cooling System
In 2005 the 8.9-GeV/c Fermilab Recycler an-
S. Nagaitsev (Fermilab)
tiproton storage ring was equipped with an
electron cooling system, capable of cooling
a record number of particles. The electron cooling system complements the existing stochastic cooling system –
the two systems operate concurrently. This paper will describe the performance of the Recycler ring with a dual
cooling system, its limitations (instabilities and beam lifetime) and future plans to store and cool a larger number of
antiprotons.
A Design for a HOM Water Cooled Absorber for the PEP-II B-factory Low Energy Ring
M. Kosovsky, N. Kurita, A. Novokhatski, J. Seeman, S.P. Weathersby
(SLAC)
220
At high currents and small bunch lengths
beam line components in the PEP-II B-factory
experience RF induced heating from higher
order RF modes (HOMs) produced by scat-
tered intense beam fields. A design for a passive HOM water cooled absorber for the PEP-II low energy ring is
presented. This device is to be situated near HOM producing beamline components such as collimators and provide
HOM damping for dipole and quadrupole modes while minimizing impedance to the beam. We present a method