Transverse mode coupling instabilities | Zendy

J. Gareyte | Zendy

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Transverse mode coupling instabilities

Author(s) -

J. Gareyte

Publication year - 2001

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.177

H-Index - 75

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.1420419

Subject(s) - bunches , physics , instability , coupling (piping) , synchrotron , transverse plane , particle accelerator , electron , proton , beam (structure) , atomic physics , nuclear physics , optics , mechanics , materials science , structural engineering , engineering , metallurgy

Transverse mode coupling instabilities (TMCI) emerged between 1974 and 1980 as the main limitation of dense bunches in electron synchrotrons and storage rings. A two-particle model allows one to calculate the beam break-up (BBU) instability in linacs. Extending this to synchrotrons shows that the BBU instability is suppressed below a threshold intensity by synchrotron oscillations. The classical theory of head-tail modes, together with the general properties of coupling impedances, is used to show how single bunches become unstable when head-tail modes couple together: this is the TMCI threshold. Above threshold, observations in both proton and electron synchrotrons can be described by BBU theory.

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