CERN Accelerating science

Article
Report number arXiv:1710.08772
Title Tune compensation in nearly scaling fixed field alternating gradient accelerators
Author(s) Haj Tahar, Malek (CERN) ; Méot, François (BNL, C-A Dept.)
Publication 2020-05-23
Imprint 2017-10-22
Number of pages 22
In: Phys. Rev. Accel. Beams 23 (2020) 054003
DOI 10.1103/PhysRevAccelBeams.23.054003 (publication)
Subject category physics.acc-ph ; Accelerators and Storage Rings
Abstract In this paper, we investigate the stability of the particle trajectories in Fixed Field Alternating Gradient (FFAG) accelerators in the presence of field errors: The emphasis is on the scaling FFAG type: a collaboration work is on-going in view of better understanding the properties of the 150 MeV scaling FFAG at KURRI in Japan, and progress towards high intensity operation. Analysis of certain types 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. A compensation scheme of tune variations in imperfect scaling FFAGs is presented. This is the cornerstone of a novel concept of a non-linear non-scaling fixed tune FFAG that we present and discuss in details in the last part of this paper.
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