title: Progress in high-temperature oven development for 28 GHz electron cyclotron resonance ion source.
abstract: We have been developing a high-temperature oven using UO2 in the 28 GHz superconducting electron cyclotron resonance ion source at RIKEN since 2013. A total of eleven on-line tests were performed. The longest operation time in a single test was 411 h, and the consumption rate of UO2 was approximately 2.4 mg/h. In these tests, we experienced several problems: the ejection hole of a crucible was blocked with UO2 and a crucible was damaged because of the reduction of tungsten strength at high temperature. In order to solve these problems, improvements to the crucible shape were made by simulations using ANSYS.
authors.affiliation: RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Ohnishi
authors.affiliation: RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Higurashi
authors.affiliation: RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nakagawa