skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Controlling hollow relativistic electron beam orbits with an inductive current divider

Abstract

A passive method for controlling the trajectory of an intense, hollow electron beam is proposed using a vacuum structure that inductively splits the beam's return current. A central post carries a portion of the return current (I{sub 1}), while the outer conductor carries the remainder (I{sub 2}). An envelope equation appropriate for a hollow electron beam is derived and applied to the current divider. The force on the beam trajectory is shown to be proportional to (I{sub 2}-I{sub 1}), while the average force on the envelope (the beam width) is proportional to the beam current I{sub b} = (I{sub 2} + I{sub 1}). The values of I{sub 1} and I{sub 2} depend on the inductances in the return-current path geometries. Proper choice of the return-current geometries determines these inductances and offers control over the beam trajectory. Solutions using realistic beam parameters show that, for appropriate choices of the return-current-path geometry, the inductive current divider can produce a beam that is both pinched and straightened so that it approaches a target at near-normal incidence with a beam diameter that is on the order of a few mm.

Authors:
; ; ; ; ; ; ; ; ;  [1]
  1. Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375 (United States)
Publication Date:
OSTI Identifier:
22408137
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BEAM PROFILES; CONTROL; COUNTER CURRENT; CURRENTS; ELECTRON BEAMS; GEOMETRY; INDUCTANCE; MATHEMATICAL SOLUTIONS; ORBITS; RELATIVISTIC RANGE; TRAJECTORIES

Citation Formats

Swanekamp, S. B., Richardson, A. S., Angus, J. R., Cooperstein, G., Hinshelwood, D. D., Ottinger, P. F., Rittersdorf, I. M., Schumer, J. W., Weber, B. V., and Zier, J. C. Controlling hollow relativistic electron beam orbits with an inductive current divider. United States: N. p., 2015. Web. doi:10.1063/1.4907663.
Swanekamp, S. B., Richardson, A. S., Angus, J. R., Cooperstein, G., Hinshelwood, D. D., Ottinger, P. F., Rittersdorf, I. M., Schumer, J. W., Weber, B. V., & Zier, J. C. Controlling hollow relativistic electron beam orbits with an inductive current divider. United States. doi:10.1063/1.4907663.
Swanekamp, S. B., Richardson, A. S., Angus, J. R., Cooperstein, G., Hinshelwood, D. D., Ottinger, P. F., Rittersdorf, I. M., Schumer, J. W., Weber, B. V., and Zier, J. C. Sun . "Controlling hollow relativistic electron beam orbits with an inductive current divider". United States. doi:10.1063/1.4907663.
@article{osti_22408137,
title = {Controlling hollow relativistic electron beam orbits with an inductive current divider},
author = {Swanekamp, S. B. and Richardson, A. S. and Angus, J. R. and Cooperstein, G. and Hinshelwood, D. D. and Ottinger, P. F. and Rittersdorf, I. M. and Schumer, J. W. and Weber, B. V. and Zier, J. C.},
abstractNote = {A passive method for controlling the trajectory of an intense, hollow electron beam is proposed using a vacuum structure that inductively splits the beam's return current. A central post carries a portion of the return current (I{sub 1}), while the outer conductor carries the remainder (I{sub 2}). An envelope equation appropriate for a hollow electron beam is derived and applied to the current divider. The force on the beam trajectory is shown to be proportional to (I{sub 2}-I{sub 1}), while the average force on the envelope (the beam width) is proportional to the beam current I{sub b} = (I{sub 2} + I{sub 1}). The values of I{sub 1} and I{sub 2} depend on the inductances in the return-current path geometries. Proper choice of the return-current geometries determines these inductances and offers control over the beam trajectory. Solutions using realistic beam parameters show that, for appropriate choices of the return-current-path geometry, the inductive current divider can produce a beam that is both pinched and straightened so that it approaches a target at near-normal incidence with a beam diameter that is on the order of a few mm.},
doi = {10.1063/1.4907663},
journal = {Physics of Plasmas},
number = 2,
volume = 22,
place = {United States},
year = {Sun Feb 15 00:00:00 EST 2015},
month = {Sun Feb 15 00:00:00 EST 2015}
}