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Title: Development of a high brightness, ohmically generated thin film lithium ion source

Abstract

A pure lithium ion source with low source divergence capable of generating high current density beams ({approx}1,000 A/cm{sup 2}) is required for pursuing the goal of light ion inertial confinement fusion using pulsed power. It is believed that a uniform fully ionized lithium plasma at the anode surface ({approx}100 cm{sup 2}) created just before arrival of the main power pulse (5--30 MV, 0.1--1 MA, 40--60 ns) will be superior to flashover or field-threshold lithium sources. One method being pursued at Sandia is the development of an ohmically driven thin film lithium source, often termed EMFAPS. The EMFAPS process consists of an electrical pulse driven through a thin film coated with or bearing lithium in alloy or compound. The high current flowing through a thin film coated with or bearing lithium in alloy or compound. The high current flowing through the film increases its temperature and resistivity until the lithium is driven off as vapor. The resistive voltage drop across the film generates a plasma by a gas discharge. Low impedance, fast risetime pulsers provided by NRL and Pulse Sciences Inc. are being assembled and evaluated as film current drivers for full scale anodes ({approx}70 cm{sup 2}). Smaller scale ({approx}1 cm{supmore » 2}) tests are underway to optimize film composition, current contact engineering, anode construction, impedance dynamics, and energy disposition. Plasma discharge cleaning, bakeouts, film design and material selection issues are also being characterized to improve ion purity.« less

Authors:
; ; ;  [1]
  1. Sandia National Labs., Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Laboratory
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
338514
Report Number(s):
CONF-970559-
Journal ID: ISSN 0730-9244; TRN: 99:005815
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: 24. IEEE international conference on plasma science, San Diego, CA (United States), 19-23 May 1997; Other Information: PBD: 1997; Related Information: Is Part Of IEEE conference record -- Abstracts; PB: 354 p.
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; LITHIUM IONS; ION SOURCES; INERTIAL FUSION DRIVERS; ION BEAM FUSION REACTORS; PLASMA PRODUCTION; ANODES; DESIGN; IMPURITIES

Citation Formats

Menge, P.R., Cuneo, M.E., Bernard, M.A., and Fowler, W.E. Development of a high brightness, ohmically generated thin film lithium ion source. United States: N. p., 1997. Web.
Menge, P.R., Cuneo, M.E., Bernard, M.A., & Fowler, W.E. Development of a high brightness, ohmically generated thin film lithium ion source. United States.
Menge, P.R., Cuneo, M.E., Bernard, M.A., and Fowler, W.E. Wed . "Development of a high brightness, ohmically generated thin film lithium ion source". United States.
@article{osti_338514,
title = {Development of a high brightness, ohmically generated thin film lithium ion source},
author = {Menge, P.R. and Cuneo, M.E. and Bernard, M.A. and Fowler, W.E.},
abstractNote = {A pure lithium ion source with low source divergence capable of generating high current density beams ({approx}1,000 A/cm{sup 2}) is required for pursuing the goal of light ion inertial confinement fusion using pulsed power. It is believed that a uniform fully ionized lithium plasma at the anode surface ({approx}100 cm{sup 2}) created just before arrival of the main power pulse (5--30 MV, 0.1--1 MA, 40--60 ns) will be superior to flashover or field-threshold lithium sources. One method being pursued at Sandia is the development of an ohmically driven thin film lithium source, often termed EMFAPS. The EMFAPS process consists of an electrical pulse driven through a thin film coated with or bearing lithium in alloy or compound. The high current flowing through a thin film coated with or bearing lithium in alloy or compound. The high current flowing through the film increases its temperature and resistivity until the lithium is driven off as vapor. The resistive voltage drop across the film generates a plasma by a gas discharge. Low impedance, fast risetime pulsers provided by NRL and Pulse Sciences Inc. are being assembled and evaluated as film current drivers for full scale anodes ({approx}70 cm{sup 2}). Smaller scale ({approx}1 cm{sup 2}) tests are underway to optimize film composition, current contact engineering, anode construction, impedance dynamics, and energy disposition. Plasma discharge cleaning, bakeouts, film design and material selection issues are also being characterized to improve ion purity.},
doi = {},
journal = {},
issn = {0730-9244},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {12}
}

Conference:
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