Study of Low Work Function Materials for Hot Cavity Resonance Ionization Laser Ion Sources

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The selectivity of a hot cavity resonance ionization laser ion source (RILIS) is most often limited by contributions from competing surface ionization on the hot walls of the ionization cavity. In this article we present investigations on the properties of designated high-temperature, low-work funct...

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Detalles Bibliográficos
Autores principales: Catherall, R, Crepieux, B, Fedosseev, V, Marsh, B, Mattolat, C, Menna, Mariano, Österdahl, F, Raeder, S, Schwellnus, F, Stora, T, Wendt, K
Lenguaje:eng
Publicado: 2008
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/1152281
Descripción
Sumario:The selectivity of a hot cavity resonance ionization laser ion source (RILIS) is most often limited by contributions from competing surface ionization on the hot walls of the ionization cavity. In this article we present investigations on the properties of designated high-temperature, low-work function materials regarding their performance and suitability as cavity material for RILIS. Tungsten test cavities, impregnated with a mixture of barium oxide and strontium oxide (BaOSrO on W), or alternatively gadolinium hexaboride (GdB6) were studied in comparison to a standard tungsten RILIS cavity as being routinely used for hot cavity laser ionization at ISOLDE. Measurement campaigns took place at the off-line mass separators at ISOLDE / CERN, Geneva and RISIKO / University of Mainz.

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