title: Development of a pepper-pot emittance meter for diagnostics of low-energy multiply charged heavy ion beams extracted from an ECR ion source.
abstract: Several fluorescent materials were tested for use in the imaging screen of a pepper-pot emittance meter that is suitable for investigating the beam dynamics of multiply charged heavy ions extracted from an ECR ion source. SiO2 (quartz), KBr, Eu-doped CaF2, and Tl-doped CsI crystals were first irradiated with 6.52-keV protons to determine the effects of radiation damage on their fluorescence emission properties. For such a low-energy proton beam, only the quartz was found to be a suitable fluorescent material, since the other materials suffered a decay in fluorescence intensity with irradiation time. Subsequently, quartz was irradiated with heavy (12)C(4+), (16)O(4+), and (40)Ar(11+) ions, but it was found that the fluorescence intensity decreased too rapidly to measure the emittance of these heavy-ion beams. These results suggest that a different energy loss mechanism occurs for heavier ions and for protons.
authors.affiliation: Nishina Center for Accelerator Based Science, RIKEN, Wako, Saitama 351-0198, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nagatomo
authors.affiliation: Nishina Center for Accelerator Based Science, RIKEN, Wako, Saitama 351-0198, Japan.
authors.forename: V
authors.initials: V
authors.lastname: Tzoganis
authors.affiliation: Nishina Center for Accelerator Based Science, RIKEN, Wako, Saitama 351-0198, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kase
authors.affiliation: Nishina Center for Accelerator Based Science, RIKEN, Wako, Saitama 351-0198, Japan.
authors.forename: O
authors.initials: O
authors.lastname: Kamigaito
authors.affiliation: Nishina Center for Accelerator Based Science, RIKEN, Wako, Saitama 351-0198, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nakagawa