High efficiency inductive output tubes with intense annular electron beams
Abstract
For mobile ionospheric heaters, it is necessary to develop highly efficient RF sources capable of delivering radiation in the frequency range from 3 to 10 MHz with an average power at a megawatt level. A promising source, which is capable of offering these parameters, is a grid-less version of the inductive output tube (IOT), also known as a klystrode. In this paper, studies analyzing the efficiency of grid-less IOTs are described. The basic trade-offs needed to reach high efficiency are investigated. In particular, the trade-off between the peak current and the duration of the current micro-pulse is analyzed. A particle in the cell code is used to self-consistently calculate the distribution in axial and transverse momentum and in total electron energy from the cathode to the collector. The efficiency of IOTs with collectors of various configurations is examined. It is shown that the efficiency of IOTs can be in the 90% range even without using depressed collectors.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 01, 2017
- Source ID
- 10.1063/1.4986006
Entities
People
- Amith H. Narayan
- Antonio Ting
- B. L. Beaudoin
- D. Matthew
- G. S. Nusinovich
- Jayakrishnan A. Karakkad
- R. Ray
- T. M. Antonsen Jr.
Organizations
- Air Force Office of Scientific Research
- University of Maryland