Abstracts Brochure - CERN

TUPLS024
TUPLS025
TUPLS026
27-Jun-06 16:00 - 18:00 TUPLS — Poster Session
resonance crossings during acceleration. It is now essential to build at least one to study them in detail and learn how
to optimise them for a variety of applications. It is currently planned to build two in the UK: (1) an electron FFAG
(EMMA) to model muon acceleration and do a detailed study of non-scaling optics; (2) a proton FFAG as a prototype
for hadron therapy. This contribution will discuss both of these projects.
FFAG as a Muon Accelerator for Neutrino Factory
The FFAG accelerator is a solution for rapid
S. Machida (CCLRC/RAL/ASTeC)
acceleration of muons because of its large
aperture and no need of magnet ramping.
Its particle dynamics is, however, peculiar due to high energy gain per turn and large transverse amplitude, which
has not been seen in other types of circular accelerators. One variation of FFAG, called non-scaling FFAG, employs
quite new scheme, namely, out of bucket acceleration. We studied emittance distortion, coupled motions among 3-D
planes, effects of resonance lines, etc., based on a newly developed tracking code. In this paper, we will emphasize
new regime of particle dynamics as well as a modeling technique of FFAG.
Muon Acceleration with a Combination of the Non-scaling FFAG and Superconducting
Linac
The non-scaling Fixed-Field Alternating Gra-
D. Trbojevic, J.S. Berg (BNL) S.A. Bogacz (Jefferson Lab)
dient (FFAG) machines have very strong focusing,
large momentum acceptance, and
small dispersion and betatron functions. This report is a study of using a compact non-scaling FFAG in combination
with the superconducting linac to accelerate the muons. The drift space between two kinds of combined
function magnets in the previous non-scaling FFAG is removed. The time of flight in the non-scaling FFAG has a
parabolic dependence on momentum. The large energy acceptance of the machine requires matching between the
linac and the non-scaling FFAG arcs for both the betatron and dispersion functions over the entire energy range.
A Design of a Combination of Energy Recovery Linac and the Non-scaling FFAG for e-
RHIC
D. Trbojevic, J.S. Berg, M. Blaskiewicz, V. Litvinenko, V. Ptitsyn, T.
Roser, A.G. Ruggiero (BNL)
226
The future relativistic electron heavy ion or
proton collider e-RHIC requires acceleration
of electrons to 10 GeV. In the case that the
super conducting linac is selected for accel-
eration, an energy recovery scheme is required. We propose to study a possibility of using the non-scaling Fixed-
Field Gradient-Accelerator (FFAG) for different energies. The beam will be accelerated by the superconducting linac
at the top of the sine function, brought back to the front of the linac by the non-scaling FFAG and repeating this a
few times until the total energy of 10 GeV is reached. After collisions the beam is brought back by the non-scaling
FFAG and decelerated (on the lower RF phase) in the same sequence but in the reverse order. Conventional and
non-conventional beam dynamic issues will be discussed, like the transit time matching effect and the time of flight
adjustments.