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

Technical Report · Wed Mar 02 04:00:00 EST 2016

DOI:https://doi.org/10.2172/1244213· OSTI ID:1244213

Haj, Tahar M. ^[1]; Meot, F. ^[1]

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

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.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
• OSTI ID: 1244213
• Report Number(s): BNL--111931-2016-IR; KB0202011
• Country of Publication: United States
• Language: English

Related Subjects

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