PAC2013 - List of Authors (Chin, Y.H.)

Paper	Title	Page
MOYBB1	Analysis of Transverse Instabilities Observed at J-PARC MR and their Suppression using Feedback Systems	27
	Y.H. Chin KEK, Ibaraki, Japan
	This talk should present an analysis of transverse instabilities observed at the J-PARC MR (Main Ring) and their suppression using feedback systems. Instabilities were mainly observed at low energies. About 30% of particles are lost due to the instabilities if the feedback system is turned off at the beam power of 120kW. Both horizontal and vertical instabilities were observed. An analysis unveils that a dipole mode has a temporal appearance of higher-order head-tail modes if the chromaticity is suffisiently large. The development of instabilities in the presence of a large chromaticity should be considered for conditions beyond the Sacherer's text book case.

Paper

Title

Page

Analysis of Transverse Instabilities Observed at J-PARC MR and their Suppression using Feedback Systems

27

Y.H. Chin
KEK, Ibaraki, Japan

This talk should present an analysis of transverse instabilities observed at the J-PARC MR (Main Ring) and their suppression using feedback systems. Instabilities were mainly observed at low energies. About 30% of particles are lost due to the instabilities if the feedback system is turned off at the beam power of 120kW. Both horizontal and vertical instabilities were observed. An analysis unveils that a dipole mode has a temporal appearance of higher-order head-tail modes if the chromaticity is suffisiently large. The development of instabilities in the presence of a large chromaticity should be considered for conditions beyond the Sacherer's text book case.