Yuto Tsuda

Preliminary results of 4.0-6.0 GHz extraordinary mode experiments on 2.45 GHz ECRIS

Penetration conditions of electromagnetic and electrostatic waves propagating in electron cyclotron resonance (ECR) ion source (ECRIS) plasma in Osaka Univ. have been examined in detail, and its relationship with the production of multicharged ions have been investigated experimentally. It has been clarified that there exists efficient configurations of ECR zones for producing multicharged ion beams, and it has been suggested that new resonances, i.e. upper hybrid resonances, must have occurred. We have been conducting new advanced experiments inducing actively these additional effects to enhance multicharged ion beams by launching extra-ordinary (x) mode waves. We have been trying to apply 4-6GHz x-mode microwaves to the 2.45GHz ECRIS, and in this paper we will describe the preliminary experimental results.Penetration conditions of electromagnetic and electrostatic waves propagating in electron cyclotron resonance (ECR) ion source (ECRIS) plasma in Osaka Univ. have been examined in detail, and its relationship with the production of multicharged ions have been investigated experimentally. It has been clarified that there exists efficient configurations of ECR zones for producing multicharged ion beams, and it has been suggested that new resonances, i.e. upper hybrid resonances, must have occurred. We have been conducting new advanced experiments inducing actively these additional effects to enhance multicharged ion beams by launching extra-ordinary (x) mode waves. We have been trying to apply 4-6GHz x-mode microwaves to the 2.45GHz ECRIS, and in this paper we will describe the preliminary experimental results.

Optimization of Mid-Electrode Potential and Extraction Gap for Miscellaneous Ion Beam from Electron Cyclotron Resonance Ion Source

Our goal is producing and extracting　multicharged ion beams ranged wide mass/charge numbers in the single device. We are constructing the extractor which can be optimized for various ion species. The extractor in an electron cyclotron resonance ion source (ECRIS) consists of three electrodes. We improve the width of gap length between plasma electrode and mid-electrode of the extractor. The width of gap length can be enlarged in 10-65mm. We investigate the behaviors of ion beam currents and the beam losses under different gap and operating pressures. We succeed in extracting ion beams of different plasma parameters efficiently and in suppressing the beam losses by changing the gap length and by applying mid-electrode potential. In addition, we can understand the characteristics of the extractor by using a simple theoretical calculation on the compact modelling for ion beam formation.

Developing Pure Iron Evaporator and Production of Iron Ion Beam in Tandem-Type Electron Cyclotron Resonance Ion Source

Multicharged metal ion beams are applied in various fields. We are planning synthesis of iron-endohedral fullerene by collision reaction in vapor phase in an electron cyclotron resonance (ECR) plasma. We have already succeeded in producing multicharged fullerene ions by using fullerene evaporator in ECR ion source (ECRIS). In a vapor phase synthesis, pure iron vapor is required. However, it is difficult to produce and introduce pure iron vapor into the ECRIS, therefore it is key technology for synthesizing iron-endohedral fullerene. We developed pure iron evaporators by ohmic heating method, and produced iron ion beam in the first stage of the tandem-type ECRIS. The aim of this paper is to investigate properties of new evaporators and to compare with previous researches. As a result, we have succeeded in producing large vapor flux and iron ion beam than the previous researches. We are planning synthesizing iron-endohedral fullerene on the tandem-type ECRIS by using these evaporators.

Spatial Distribution of Multicharged Ions from Space Potentials Measured by Probe and Beam Methods on ECRIS

It has been performing to elucidate the basis of various physical processes, phenomena in an electron cyclotron resonance (ECR) plasma, and its various empirical methods. In order to obtain guiding principle for further improvement of the state of art technology on ECR ion source (ECRIS) will be used in various fields, the object is to develop moreover new fields together still existing applications. In this paper, spatial distribution of multicharged ions has been experimentally measured from space potential measurements with probe and beam methods, and relationship between extracted ion beam currents and other parameters has been investigated.

Spatial Variation of Electron Energy Distribution Functions along to Field Lines on ECRIS

Fundamental studies have been made to elucidate the basis of various physical processes and physical phenomena in electron cyclotron resonance (ECR) plasma. In order to obtain guiding principle for further improvement of the state of art technology on ECR ion sources (ECRIS), it is the object to develop moreover efficiencies of them in new fields together still existing applications in various field. In this paper, spatial variations of electron energy distribution function (EEDF) have been experimentally measured and reported with relationship extracted ion beam currents and other parameters.