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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 1), while the outer conductor carries the remainder (I 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 2-I 1), while the average force on the envelope (the beam width) is proportional to the beam current I b = (I 2 + I 1). The values of I 1 and I 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. As a result, 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];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Naval Research Lab., Washington, D.C. (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Science (NA-113)
OSTI Identifier:
1237363
Alternate Identifier(s):
OSTI ID: 1421018
Report Number(s):
SAND-2015-0107J
Journal ID: ISSN 1070-664X; PHPAEN; 558381
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 2; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; electric fields; magnetic fields; electron beams; charged currents; current density

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. Fri . "Controlling hollow relativistic electron beam orbits with an inductive current divider". United States. doi:10.1063/1.4907663. https://www.osti.gov/servlets/purl/1237363.
@article{osti_1237363,
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 (I1), while the outer conductor carries the remainder (I2). 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 (I2-I1), while the average force on the envelope (the beam width) is proportional to the beam current Ib = (I2 + I1). The values of I1 and I2 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. As a result, 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 = {Fri Feb 06 00:00:00 EST 2015},
month = {Fri Feb 06 00:00:00 EST 2015}
}

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