Progress of JT-60SA Project: EU-JA joint efforts for assembly and fabrication of superconducting tokamak facilities and its research planning

Shirai, Hiroshi; Barabaschi, P.; Kamada, Y.

doi:10.1016/j.fusengdes.2015.10.026

Cited by 23 publications

(9 citation statements)

References 29 publications

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“…Being based on above the basic physics understanding of the H − beam non-uniformity in the QST 10A source, a super-giant H − source by multi-cusp arc-discharge has been developed for the N-NBI system of plasma heating and non-inductive current drive for the JT-60SA tokamak [24], which is currently one of the largest tokamaks with superconducting magnets in the world and now under construction as an EU-JAPAN international collaboration project.…”

Section: Modeling Of Qst Jt-60sa Kamaboko Sourcementioning

confidence: 99%

“…For example, such a kind of non-uniformity was observed in the N-NBI system [20] for the JAEA (Japan Atomic Energy Research Agency: * present QST: National Institute for Quantum and Radiological Science and Technology) JT-60U tokamak. The JT-60U tokamak is one of the largest magnetic fusion devices in the world and now is being upgraded to the JT-60SA with superconducting magnets for plasma confinement [24].A series of modeling studies [25][26][27][28][29][30][31] for such giant sources, more specifically, for the QST 10A source and JT-60SA H − source will be reviewed (section 2.3). The effect of the EEDFs on H − SP and the origin of H − beam non-uniformity will be discussed.…”

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Present status of numerical modeling of hydrogen negative ion source plasmas and its comparison with experiments: Japanese activities and their collaboration with experimental groups

et al. 2018

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The present status of kinetic modeling of particle dynamics in hydrogen negative ion (H − ) source plasmas and their comparisons with experiments are reviewed and discussed with some new results. The main focus is placed on the following topics, which are important for the research and development of H − sources for intense and high-quality H − ion beams: (i) effects of non-equilibrium features of electron energy distribution function on volume and surface H − production, (ii) the origin of the spatial non-uniformity in giant multi-cusp arc-discharge H − sources, (iii) capacitive to inductive (E to H) mode transition in radio frequency-inductively coupled plasma H − sources and (iv) extraction physics of H − ions and beam optics, especially the present understanding of the meniscus formation in strongly electronegative plasmas (so-called ion-ion plasmas) and its effect on beam optics. For these topics, mainly Japanese modeling activities, and their domestic and international collaborations with experimental studies, are introduced with some examples showing how models have been improved and to what extent the modeling studies can presently contribute to improving the source performance. Close collaboration between experimental and modeling activities is indispensable for the validation/improvement of the modeling and its contribution to the source design/development. chamber wall (anode) and filaments (cathode). In the latter sources, the RF-electromagnetic field is used to generate and heat plasmas.In this review, we mainly focus on the modeling studies, especially the modeling study of H − source plasmas using kinetic approaches, such as the test particle Monte-Carlo model [14] and particle in cell (PIC) model [14,15], which has been reviewed in [16]. Here, we extend it with some new results. Close collaboration between the experimental and modeling study is very important as it can improve our basic understanding of source plasmas. Various examples of the model validation will be shown through comparisons with experiments and also how modeling studies contribute to the improvement of source performances.As for the multi-cusp arc-discharge source, we will first show a systematic study to help us understand the role of the EEDF on the H − VP in section 2.2. The study has been carried out for a compact multi-cusp arcdischarge source (SHI H − source: Sumitomo Heavy Industry H − source [17,18]) for medical application such as boron neutron capture therapy and the radioisotope production for molecular imaging technology.The SHI H − source is a typical tandem type H − source [19]. In such a tandem type volume sources, the plasma source volume is divided into two regions by the transverse magnetic field (the so-called magnetic filter filed: MF-field) to control the EEDFs and to promote the two step H − VP reactions explained above. Namely, the source volume consists of two regions: (1) the 'driver region' where the electron energy is high and the EV process is promoted, and (2) the 'extraction region' where the electr...

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Section: Modeling Of Qst Jt-60sa Kamaboko Sourcementioning

confidence: 99%

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Present status of numerical modeling of hydrogen negative ion source plasmas and its comparison with experiments: Japanese activities and their collaboration with experimental groups

et al. 2018

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“…Moreover, in this configuration the plasma needs to be sustained by a drive current that is particularly demanding due to the large toroidal plasma current and density and to the low value of the toroidal magnetic field. Also in conventional tokamaks, the inner part of the toroidal magnets and the ohmic transformer (solenoid) are crucial for any operation [4,11].…”

Section: Advantages and Potential Developments Of The Proto-sphera Apmentioning

confidence: 99%

Progress of the Plasma Centerpost for the PROTO-SPHERA Spherical Tokamak

et al. 2016

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Plasma properties can be useful in a wide spectrum of applications. Experimental projects on controlled nuclear fusion are the most challenging of these applications and, at the same time, the best way to approach plasma science. Since nuclear fusion reactors can ensure a large-scale, safe, environmentally-friendly and virtually inexhaustible source of energy, several fusion-oriented megaprojects and innovative companies are appearing all over the world. PROTO-SPHERA (Spherical Plasma for HElicity Relaxation Assessment) is the first plasma project with a simply connected configuration, namely not requiring additional objects inside the plasma volume. This is obtained by a plasma arc, shaped as a screw pinch, acting as the centerpost of a spherical torus with minimal aspect ratio. Due to its intrinsic physical, engineering and economic advantages, this new approach is attractive also on an industrial scale and with several developments that still needs to be explored. This paper presents the PROTO-SPHERA basic principles, its first encouraging results and its expected and potential evolutions.

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“…The parameters of JT-60SA, as well as a description of the main plasma scenarios can be found in the JT-60SA Research Plan [2] and are summarized in tables 1 and 2. The most specific characteristics of the machine (size, shaping capability, pulse length, heating and current drive system, diagnostic and control systems) [3] qualify JT-60SA as a tokamak particularly suited for experimental investigation of high beta regimes, fast ion physics, control of high performance scenarios over long pulses [4]. Moreover, by a dedicated experimental programme, JT-60SA will be able to timely address specific ITER risk mitigation issues, such as disruption prevention and mitigation, runaways, ELM avoidance and control, L-H transition, mastering heat loads, test of high-priority diagnostics, real-time control strategies and event handling, etc.…”

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Physics and operation oriented activities in preparation of the JT-60SA tokamak exploitation

et al. 2017

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The JT-60SA tokamak, being built under the Broader Approach agreement jointly by Europe and Japan, is due to start operation in 2020 and is expected to give substantial contributions to both ITER and DEMO scenario optimisation. A broad set of preparation activities for an efficient start of the experiments on JT-60SA is being carried out, involving elaboration of the Research Plan, advanced modelling in various domains, feasibility and conception studies of diagnostics and other sub-systems in connection with the priorities of the scientific programme, development and validation of operation tools. The logic and coherence of this approach, as well as the most significant results of the main activities undertaken are presented and summarised.

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Progress of JT-60SA Project: EU-JA joint efforts for assembly and fabrication of superconducting tokamak facilities and its research planning

Cited by 23 publications

References 29 publications

Present status of numerical modeling of hydrogen negative ion source plasmas and its comparison with experiments: Japanese activities and their collaboration with experimental groups

Present status of numerical modeling of hydrogen negative ion source plasmas and its comparison with experiments: Japanese activities and their collaboration with experimental groups

Progress of the Plasma Centerpost for the PROTO-SPHERA Spherical Tokamak

Physics and operation oriented activities in preparation of the JT-60SA tokamak exploitation

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