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Proceedings Paper

Electrostatic focusing and RFQ (radio frequency quadrupole) matching system for a low-energy H- beam
Author(s): Samar Kumar Guharay; C. K. Allen; Martin P. Reiser
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Paper Abstract

1407_65The conceptual design of an electrostatic quadrupole (ESQ) system for focusing and matching a 30 mA, 35 kV H- beam into a radio frequency quadrupole (RFQ) accelerator has been developed. The design procedure involves two steps. First, a linear beam optics code which solves the K-V envelope equations is used to design a lens system based on a hard-edge focusing function. The beam envelope, in conjunction with the lens parameters, should satisfy several constraints concerning electric breakdown, image forces, spherical and chromatic aberrations. Next, a practical lens design is developed. The field gradient is calculated numerically with a 3-D Laplace solver and the fringe-field integrals are evaluated to obtain the nonlinear forces up to the third order. The results from the Laplace solver generate input to a modified PARMILA code, and the beam propagation and emittance growth in the system are evaluated. Preliminary analysis shows an emittance growth of about 50%. Design of the apparatus and experimental plans are discussed.

Paper Details

Date Published: 1 April 1991
PDF: 10 pages
Proc. SPIE 1407, Intense Microwave and Particle Beams II, (1 April 1991); doi: 10.1117/12.43535
Show Author Affiliations
Samar Kumar Guharay, Univ. of Maryland (United States)
C. K. Allen, Univ. of Maryland (United States)
Martin P. Reiser, Univ. of Maryland (United States)

Published in SPIE Proceedings Vol. 1407:
Intense Microwave and Particle Beams II
Howard E. Brandt, Editor(s)

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