Title :
Experimental observations of the ion-related coupled bunch instability in a bunch train in TRISTAN AR
Author :
Fukuma, H. ; Chin, Y. ; Kato, S. ; Kikutani, E. ; Kurokawa, S. ; Matsumoto, S. ; Ohmi, K. ; Suetsugu, Y. ; Tobiyama, M. ; Yokoya, K. ; Zhang, X.L.
Author_Institution :
Accel. Lab., High Energy Accel. Res. Organ., Ibaraki, Japan
Abstract :
An experiment was carried out in TRISTAN AR for the search of the fast beam-ion instability (FBII). A train of 100 bunches with 2 ns spacing was stored with the help of the transverse bunch feedback system. The nitrogen gas was intentionally leaked into the inside of the vacuum duct to enhance the ion effect. The oscillation patterns were recorded by the beam position monitor system which is capable of storing the transverse position of every bunch up to 1600 turns. The spectra of the bunch oscillations were also measured by a spectrum analyzer. This paper describes the results of the experiment and also discusses the possible explanation of them in terms of the FBII
Keywords :
electron accelerators; particle beam bunching; particle beam diagnostics; particle beam stability; storage rings; Accumulator Ring; N; N2 gas; TRISTAN; beam position monitor; bunch oscillations; bunch train; bunches; coupled bunch instability; fast beam-ion instability; transverse bunch feedback system; Convolution; Electron beams; Extraterrestrial measurements; Instruments; Low pass filters; Monitoring; Nonlinear equations; Optical coupling; RF signals; Radio frequency;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.750770
