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Description
The ISIS facility has developed an RF-driven H⁻ ion source operating without caesiation to improve reliability; however, the beam current currently reaches 18mA. To achieve higher beam-current operation, a passive caesiation system utilizing Cs₂CrO₄-based dispensers has been designed, manufactured, and integrated into the existing RF ion source assembly. The system uses plasma heating of a Cs collar to achieve controlled caesium release, with forced-air cooling and thermocouple feedback for thermal regulation. This paper outlines the design principles, material selection, thermal management strategies, and manufacturing challenges encountered during the conversion of the RF ion source to a caesiated configuration. Key considerations include dispenser placement for uniform Cs distribution and cooling system design for efficient thermal control of the main flange and Cs collar. Future work will focus on commissioning, performance characterization, and optimizing of Cs delivery for stable, high-current operation.
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