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Title: Development of Li+ alumino-silicate ion source

Abstract

To uniformly heat targets to electron-volt temperatures for the study of warm dense matter, one strategy is to deposit most of the ion energy at the peak of energy loss (dE/dx) with a low (E< 5 MeV) kinetic energy beam and a thin target[1]. Lower mass ions have a peak dE/dx at a lower kinetic energy. To this end, a small lithium (Li+) alumino-silicate source has been fabricated, and its emission limit has been measured. These surface ionization sources are heated to 1000-1150 C where they preferentially emit singly ionized alkali ions. Alumino-silicates sources of K+ and Cs+ have been used extensively in beam experiments, but there are additional challenges for the preparation of high-quality Li+ sources: There are tighter tolerances in preparing and sintering the alumino-silicate to the substrate to produce an emitter that gives uniform ion emission, sufficient current density and low beam emittance. We report on recent measurements ofhigh ( up to 35 mA/cm2) current density from a Li+ source. Ion species identification of possible contaminants is being verified with a Wien (E x B) filter, and via time-of-flight.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Accelerator& Fusion Research Division
OSTI Identifier:
957060
Report Number(s):
LBNL-1843E
TRN: US1000672
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Conference
Resource Relation:
Conference: PAC09
Country of Publication:
United States
Language:
English
Subject:
70; BEAM EMITTANCE; CURRENT DENSITY; ION EMISSION; ION SOURCES; KINETIC ENERGY; LITHIUM; SINTERING; SUBSTRATES; SURFACE IONIZATION; TARGETS; lithium

Citation Formats

Roy, P K, Seidl, P A, Waldron, W, Greenway, W, Lidia, S, Anders, A, and Kwan, J. Development of Li+ alumino-silicate ion source. United States: N. p., 2009. Web.
Roy, P K, Seidl, P A, Waldron, W, Greenway, W, Lidia, S, Anders, A, & Kwan, J. Development of Li+ alumino-silicate ion source. United States.
Roy, P K, Seidl, P A, Waldron, W, Greenway, W, Lidia, S, Anders, A, and Kwan, J. 2009. "Development of Li+ alumino-silicate ion source". United States. https://www.osti.gov/servlets/purl/957060.
@article{osti_957060,
title = {Development of Li+ alumino-silicate ion source},
author = {Roy, P K and Seidl, P A and Waldron, W and Greenway, W and Lidia, S and Anders, A and Kwan, J},
abstractNote = {To uniformly heat targets to electron-volt temperatures for the study of warm dense matter, one strategy is to deposit most of the ion energy at the peak of energy loss (dE/dx) with a low (E< 5 MeV) kinetic energy beam and a thin target[1]. Lower mass ions have a peak dE/dx at a lower kinetic energy. To this end, a small lithium (Li+) alumino-silicate source has been fabricated, and its emission limit has been measured. These surface ionization sources are heated to 1000-1150 C where they preferentially emit singly ionized alkali ions. Alumino-silicates sources of K+ and Cs+ have been used extensively in beam experiments, but there are additional challenges for the preparation of high-quality Li+ sources: There are tighter tolerances in preparing and sintering the alumino-silicate to the substrate to produce an emitter that gives uniform ion emission, sufficient current density and low beam emittance. We report on recent measurements ofhigh ( up to 35 mA/cm2) current density from a Li+ source. Ion species identification of possible contaminants is being verified with a Wien (E x B) filter, and via time-of-flight.},
doi = {},
url = {https://www.osti.gov/biblio/957060}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 21 00:00:00 EDT 2009},
month = {Tue Apr 21 00:00:00 EDT 2009}
}

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