Abstracts Brochure - CERN

WEPLS — Poster Session 28-Jun-06 16:00 - 18:00
accumulating protons from the linac in a storage ring and bunching them into short bunches, which can then be used
for generating intense muon pulses, suitable for a neutrino factory and for PRISM/PRIME. Bunching within existing
rings and in a new Driver compressor ring are discussed, and scenario parameters are developed.
Optimization of Muon Capture and Phase-energy Rotation for a Neutrino Factory
In a neutrino factory, intense pulses of protons
produce pions and muons at a target.
In recent neutrino factory studies, these
bunches drift from the target, are bunched,
D.V. Neuffer (Fermilab) R.C. Fernow, J.C. Gallardo, R. Palmer
(BNL) K. Paul (Muons, Inc)
and the bunches are phase-energy rotated, to form a string of bunches of similar energy with manageable energy
spreads. In this paper we explore variations in this bunching and capture in order to find an optimized configuration
for the international scoping study (ISS). In these variations we consider adding gas-filled rf cavities to integrate
cooling and enable higher rf gradient, reoptimizing system lengths, frequencies and gradients, modifying collection
energy and cooling parameters, and matching into following cooling and acceleration systems.
Proton Driver Linacs as Double Duty Muon Accelerators
It has been shown how a superconducting
Linac that was designed to be a high-inten- R.P. Johnson (Muons, Inc) M. Popovic (Fermilab)
sity proton driver for Fermilab* can be modified
and augmented to also serve as the muon accelerating section for a neutrino factory**. In this report we consider
the same approach, where the Linac does double duty, but with the idea that the Linac and other parameters are
chosen to serve only as a neutrino factory. This "greenfield" approach allows the most economical choices for such
a neutrino factory and provides a baseline cost estimate to be compared to other approaches where other methods
such as FFAG synchrotrons are used. Recent advances in muon cooling*** have the promise of muon emittances that
are compatible with high frequency superconducting accelerating structures that are by now sufficiently mature for
reliable cost estimates. The muon cooling required for such an approach to a muon collider, although there have
been impressive theoretical advances and simulation results, remains still to be proved. In this report we discuss the
uncertainties in the design parameters that will depend on the muon cooling efforts that are now underway.
*G. W. Foster and J. A. MacLachlan, LINAC 2002, Gyeongju, Korea. **M. Popovic and R. P. Johnson, NuFact05. ***R.
P. Johnson, Technical Challenges of Muon Colliders, NuFact05.
Simulations of Helical Muon Cooling Channels
A helical cooling channel (HCC) can quickly
reduce the six dimensional phase space of
muon beams for muon colliders, neutrino
factories, and intense muon sources. The
R.P. Johnson, K. Paul, T.J. Roberts (Muons, Inc) Y.S. Derbenev (Jefferson
Lab) K. Yonehara (Fermilab)
HCC is composed of solenoidal, helical dipole, and helical quadrupole magnetic fields to provide the focusing
and dispersion needed for emittance exchange as the beam follows an equilibrium helical orbit through a continuous
homogeneous absorber. We consider liquid helium and liquid hydrogen absorbers in HCC segments that alternate
with RF accelerating sections and we also consider gaseous hydrogen absorber in pressurized RF cavities imbedded
in HCC segments. In the case of liquid absorber, the possibility of using superconducting RF in low magnetic field
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