Experimental Studies of Electron Beam Transport in Stellarator Focussing Fields
Abstract
The Spiral Line Induction Accelerator (SLIA) is under development as a compact accelerator potentially capable of accelerating electron beam currents up to about 10 kA to energies of many tens of MeV. The beam is guided through a few successive transits of induction acceleration cavities. The desired beam current and energies make guide field focussing a practical requirement. The open-ended geometry greatly simplifies injection and extraction of the beam with respect to a closed-orbit geometry. Strong focussing in the presence of a guide field is incorporated in the bend sections via twisted quadrupole (stellarator) windings superimposed upon a guide field and a vertical bending field. The concept is synthesis of ideas from linear induction accelerators, the recirculation scheme suggested by Mark Wilson of NBS (now NIST), and the stellarator focussing proposed by Roberson, et al. Each segment of the magnetic channel need be optimized only for a relatively narrow energy range; there is no need for rapid cycling of the focussing fields. An accelerator experiment using this principle at the level of 10 kA of beam current, with an energy of approximately 10 MeV(two acceleration passes) is presently in progress to validate the focussing and dispersive characteristics of the SLIA bends and experimentally determine the consequences of off-axis acceleration of high- current beams in induction cavities prior to attempting higher energy through multiple recirculation passes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1991
- Accession Number
- ADA243597
Entities
People
- J. A. Edighoffer
- J. P. Lidestri
- M. G. Tiefenback
- S. D. Putnam
- V. L. Bailey Jr.