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Title: Development of Li+ alumino-silicate ion source

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:
OSTI Identifier:
957060
Report Number(s):
LBNL-1843E
TRN: US1000672
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Conference
Resource Relation:
Conference: PAC09
Research Org:
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
Sponsoring Org:
Accelerator& Fusion Research Division
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