Title :
Characterization of electron flow in negative- and positive-polarity linear-induction accelerators
Author :
Rosenthal, Stephen E.
Author_Institution :
Sandia Nat. Labs., Albuquerque, NM, USA
fDate :
10/1/1991 12:00:00 AM
Abstract :
The operation of the linear-induction accelerators HELIA and Hermes III was studied in both negative and positive polarities. The experiments in positive polarity have provided a unique opportunity to explore the consequences of multiple-cathode electron emission in magnetically insulated transmission lines. It is maintained that an examination of the total energy-canonical momentum distribution of the electrons explains the features of the magnetically insulated flow exhibited by these systems. Simple analysis based on the basic concept of pressure balance, in conjunction with particle-in-cell numerical simulations, shows how the line voltage is related to the anode and cathode currents. Two flow designations are introduced that can apply to multiple-cathode, magnetically insulated transmission lines: full-gap flow (FGF) and locally emitted flow (LEF)
Keywords :
electron accelerators; linear accelerators; particle beam diagnostics; HELIA; Hermes III; anode current; cathode currents; characterisation; electron flow; energy-canonical momentum distribution; flow; full-gap flow; locally emitted flow; magnetically insulated transmission lines; multiple-cathode electron emission; negative polarity; particle-in-cell numerical simulations; positive-polarity linear-induction accelerators; pressure balance; Acceleration; Anodes; Cathodes; Electrons; Feeds; Insulation; Linear accelerators; Magnetic separation; Power transmission lines; Voltage;
Journal_Title :
Plasma Science, IEEE Transactions on