Title :
Beam halo formation and loss induced by image-charge effects in a small-aperture alternating-gradient focusing system
Author :
Zhou, J. ; Qian, B.L. ; Chen, C. ; Henestroza, E. ; Eylon, S. ; Yu, S.
Author_Institution :
Plasma Sci. & Fusion Center, MIT, Cambridge, MA, USA
Abstract :
Effects of image charges on beam halo formation and beam loss in small-aperture alternating-gradient focusing systems are studied analytically, computationally, and experimentally. Nonlinear image-charge fields result in chaotic particle motion and the ejection of particles from the beam core into a halo. Detailed chaotic particle motion and structure of the particle phase space is studied, and the beam loss rate is computed for a long transport channel. Image-charge effects are also studied for a short transport channel, and compared with the Neutralized Transport Experiment (NTX) at LBNL.
Keywords :
beam handling equipment; chaos; magnetic fields; particle beam diagnostics; particle beam dynamics; particle beam focusing; particle beam stability; physics computing; Neutralized Transport Experiment; beam core; beam halo formation; beam loss; chaotic particle motion; image-charge effects; nonlinear image-charge fields; particle ejection; particle phase space; small-aperture alternating-gradient focusing system; transport channel; Analytical models; Apertures; Chaos; Equations; Focusing; Image analysis; Life estimation; Particle accelerators; Particle beams; Testing;
Conference_Titel :
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the
Print_ISBN :
0-7803-7738-9
DOI :
10.1109/PAC.2003.1289217
