Beam steering characteristics of ferromagnetic electrode

4 Sep 2018, 15:30
2h 30m
Board: 47
Poster H– and D– sources for fusion, accelerators and other applications Poster Session #2

Speaker

Dr Haruhisa Nakano (National Institute for Fusion Science)

Description

In hydrogen negative ion sources, co-extracted electrons are dumped on extraction grid (EG) with electron deflection magnets (EDMs). The negative ion beam trajectory is slightly perturbed by the EDM field, and the aperture displacement technique has been applied in negative ion sources for fusion in order to compensate the beam deflection [1]. Recently, it was proposed that the beam deflection can be intrinsically cancelled by the asymmetric EDM field [2]. In this concept, the asymmetric field is formed by the combination of the conventional EDMs and additional set of permanent magnets. In this study, a ferromagnetic steering grid (SG) was used as an alternative way to realize the asymmetric EDM field. The beam acceleration experiments were carried out in the NIFS R&D negative ion source (NIFS-RNIS), and the beam footprint was measured with a beamlet monitor system consisting of an infrared camera and 1D carbon fiber composite (CFC) tiles at various operational conditions. Analysis of the beam trajectory is being carried out with OPERA-3d code. In the presentation, we will discuss the beam steering characteristics of the ferromagnetic SG. References [1] M. Hamabe et al., Rev. Sci. Instrum. 72, 3237 (2001). [2] G. Chitarin et al., Rev. Sci. Instrum. 85, 02B317 (2014).

Primary author

Dr Masashi Kisaki (National Institute for Fusion Science)

Co-authors

Mr Antonio Pimazzoni (Consorzio RFX) Dr Gianluigi Serianni (Consorzio RFX) Dr Haruhisa Nakano (National Institute for Fusion Science) Dr Katsunori Ikeda (National Institute for Fusion Science) Prof. Katsuyoshi Tsumori (National Institute for Fusion Science) Dr Kenichi Nagaoka (National Institute for Fusion Science) Dr Marco Barbisan (Consorzio RFX) Prof. Masaki Osakabe (National Institute for Fusion Science) Dr Matteo Brombin (Consorzio RFX) Dr Pierluigi Veltri (Consorzio RFX) Sartori Emanuele (Consorzio RFX - Università di Padova) Dr Shuji Kamio (National Institute for Fusion Science) Mr Yasuaki Haba (Nagoya University / National Institute for Fusion Science) Dr Yutaka Fujiwara (National Institute for Fusion Science)

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