Li+ alumino-silicate ion source development for the neutralized drift compression experiment |
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Authors: | Roy Prabir K Greenway Wayne G Kwan Joe W Seidl Peter A Waldron William L Wu James K |
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Affiliation: | Lawrence Berkeley National Laboratory, California 94720, USA. PKRoy@lbl.gov |
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Abstract: | We report results on lithium alumino-silicate ion source development in preparation for warm dense matter heating experiments on the new neutralized drift compression experiment II. The practical limit to the current density for a lithium alumino-silicate source is determined by the maximum operating temperature that the ion source can withstand before running into problems of heat transfer, melting of the alumino-silicate material, and emission lifetime. Using small prototype emitters, at a temperature of ≈1275 °C, a space-charge limited Li(+) beam current density of J ≈1 mA/cm(2) was obtained. The lifetime of the ion source was ≈50 h while pulsing at a rate of 0.033 Hz with a pulse duration of 5-6 μs. |
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