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 (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. 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 01, 2015
- Source ID
- 10.1063/1.4907663
Entities
People
- A. S. Richardson
- Bruce V. Weber
- David D. Hinshelwood
- Gerald Cooperstein
- I. M. Rittersdorf
- J. C. Zier
- J. R. Angus
- Joseph W. Schumer
- P. F. Ottinger
- S. B. Swanekamp
Organizations
- Office of Naval Research
- Sandia National Laboratories
- United States Naval Research Laboratory