Transverse beam dynamics in non-linear Fixed Field Alternating Gradient accelerators

Haj, Tahar M.¹  Meot, F.¹ 

[1] Brookhaven National Lab. (BNL), Upton, NY (United States)

关键词: BEAM DYNAMICS;    ISOCHRONOUS CYCLOTRONS;    EQUATIONS OF MOTION;    SCALING LAWS;    MEV RANGE 100-1000;    NONLINEAR PROBLEMS;    SPACE CHARGE;    BENCHMARKS;    OPERATION;    RINGS;    VARIATIONS;    COULOMB FIELD;    MAGNETIC FIELDS;    ERRORS;    TUNING;   

DOI  :  10.2172/1244213
RP-ID  :  BNL--111931-2016-IR
PID  :  OSTI ID: 1244213
Others  :  R&D Project: KBCH139
Others  :  Other: KB0202011
Others  :  TRN: US1601041

学科分类：核物理和高能物理

美国|英语

来源: SciTech Connect

【 摘 要 】

In this paper, we present some aspects of the transverse beam dynamics in Fixed Field Ring Accelerators (FFRA): we start from the basic principles in order to derive the linearized transverse particle equations of motion for FFRA, essentially FFAGs and cyclotrons are considered here. This is a simple extension of a previous work valid for linear lattices that we generalized by including the bending terms to ensure its correctness for FFAG lattice. The space charge term (contribution of the internal coulombian forces of the beam) is contained as well, although it is not discussed here. The emphasis is on the scaling FFAG type: a collaboration work is undertaken in view of better understanding the properties of the 150 MeV scaling FFAG at KURRI in Japan, and progress towards high intensity operation. Some results of the benchmarking work between different codes are presented. Analysis of certain type of field imperfections revealed some interesting features about this machine that explain some of the experimental results and generalize the concept of a scaling FFAG to a non-scaling one for which the tune variations obey a well-defined law.