Accession Number:

AD0613447

Title:

HIGHLY IONIZED HOLLOW CATHODE DISCHARGE,

Descriptive Note:

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS

Report Date:

1961-10-24

Pagination or Media Count:

8.0

Abstract:

A hollow cathode discharge HCD is described that produces a highly ionized steady-state plasma at a temperature 1-10 eV, in a volume as large as 10,000 cu cm, with background neutral gas density 10 to the 13th powercu cm. The HCD is generated by the prescription gas flow H2, He, A, or N2 0.05-2 cc STPsec through a refractory metal hollow cathode tube into a vacuum any anode 20-200 V dc applied. An axial induction 100-1000 G is used to collimate the discharge and to aid in starting by rf excitation. The HCD runs from the cathode interior, deep enough that pd1 cmXmm Hg. Current range is 2.0-300 A. Various electrode configurations and a wide range of operating parameters have been studied. The external plasma density and temperature were measured by Langmuir probes. A discussion is given of the confinement mechanism and of the energy balance, both in the external plasma and in the region of the cathode itself. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE