EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH CERN-SL DIVISION CERN-SL-2000- 075 (AP) Transverse Mode Coupling Instabilities
نویسنده
چکیده
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 show that the BBU instability is suppressed below a threshold intensity by synchrotron oscillations. The classical theory of head-tail modes together with general properties of coupling impedances are used to show how single bunches become unstable when head-tail modes couple together: this is the TMCI threshold. Above threshold, observations both in proton and electron synchrotron can be described by BBU theory. Presented at Joint CERN-Japan-JINR-Russia-USA Accelerator School, JAS’2000 1 to 14 July 2000 Geneva, Switzerland 17 October 2000
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