Optics of Ionization Cooling Channels Under the Influence of Space Charge
AbstractLepton colliders have a significant advantage over their hadron counterparts in that hadron collisions are
inefficient and complicated by secondary quark interactions. A muon collider could be used for high
energy studies of lepton collisions without the limitations on energy due to synchrotron radiation. The
muon beam is produced by sending protons through a target, producing pions which in turn decay into
muons with a large momentum spread. For a muon collider, the six-dimensional (6D) phase space volume
of the muon beam must be reduced to accelerate it further for injection into a storage ring. Ionization
cooling is currently the only feasible method for cooling the beam within a muon lifetime of 2.2 μs. One
key technical challenge for a muon collider is the demonstration of the process of ionization cooling. In
order for a full 6D ionization cooling experiment to be constructed, a baseline lattice design has to be
studied and selected based on detailed simulations...
There are several challenges to resolve in order to demonstrate the feasibility of an ionization cooling
channel. As the size of the beam is reduced, Coulomb repulsion in the beam restricts emittance reduction.
Accurate calculation of this space charge effect is necessary...
To investigate the effect of space charge, a method has been implemented in COSY INFINITY to
achieve efficient and accurate calculation of the interparticle Coulomb forces based on variants of the
Fast Multipole Method (FMM)...
The FMM algorithm is especially suited for beam dynamics simulations because of the efficiency and low
computational error compared to other space charge algorithms.
[This is an extract from the beginning pages of the paper.]
B. Loseth, M. Berz, H. Zhang, P. Snopok, J. Kunz,
Microscopy and Microanalysis 21 Suppl. 4 (2015) 20
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