Abstracts Brochure - CERN

THPCH014
THPCH015
THPCH016
THPCH017
29-Jun-06 16:00 - 18:00 THPCH — Poster Session
Injection Study Based on Simulation in J-PARC RCS
F. Noda, H. Hotchi, P.K. Saha (JAEA/J-PARC) S. Machida (CCLRC/
RAL/ASTeC)
390
In J-PARC RCS, the beam injection will be carried
out with a multi-turn charge exchange
injection. For such a injection, a behavior of
beam in a ring strongly depends on the in-
jection scheme. Therefore the injection scheme is the most important issue on design and operation of J-PARC RCS.
A systematic study of beam injection have been performed using the SIMPSONS code. In this paper, the results from
recent study of beam injection based on beam simulation will be discussed.
Matched and Equipartitioned Dynamics Design for High-intensity RFQ Accelerators
X.Q. Yan, J.-E. Chen, J.X. Fang, Z.Y. Guo, Y.R. Lu (PKU/IHIP) R.A.
Jameson (LANL)
Maintaining beam envelope match, avoiding
structure resonances, and using an equilibrium
(equipartitioned) energy balance
within the beam are the primary methods
for preventing emittance growth and halo formation in high current linacs. A design strategy that requires the RFQ
accelerator to be matched and equipartitioned over most of its length will produces very robust designs under a
wide variety of conditions, the beam with proper energy balance is also inherently stable against resonances near the
operation point. Based on this strategy, a new dynamics method is proposed to avoid the envelope mismatch and
energy imbalance between different degrees of freedom. The beam sizes are well confined to match the accelerating
channel in this method, to minimize the emittance growth and the related beam loss. Following the method, a RFQ
design code named MATCHDESIGN has been written at Peking University. A test design of 50mA proton RFQ
operating at 350 MHz was given to prove this method and it resulted in a good dynamics design.
Transfer Matrix of Linear Focusing System in the Presence of Self-field of Intense Charged
Particle Beam
Within the framework of moments method,
Yu. Kazarinov (JINR)
the computation algorithm of the transfer
matrix in the presence of self-field of the intense
charged particle beam is given. The transfer matrix depends on both the linear external electromagnetic field
parameters and the initial value of the second order moments of the beam distribution function. In the case of
coupled degrees of freedom, the independent 2D subspaces of the whole phase space are found by means of the
linear transformation of the phase space variables. The matrix of this transformation connects with second order
moments of the beam distribution function. The momentum spread of the beam is taken into account also.
The Beam Dynamics Study for the Ion Accelerator Schema with Low Energy and High
Current
V.A. Vorontsov (MEPhI)
The low energy ion beam current increase
up to tens of amperes is one of the accelerator
technique problems. As far as the space