Steady-state tokamak operation, ITB transition and sustainment and ECCD experiments in TRIAM-1M

Zushi, H.; Nakamura, K.; Hanada, K.; Sato, K. N.; Sakamoto, M.; Idei, H.; Hasegawa, Makoto; Iyomasa, A.; Shoji, K.; Nakashima, Hideharu; Higashijima, A.; Kuramoto, Taku; Tanaka, Akiyo; Matsuo, Yoshiaki; Esaki, Kayoko; Akanishi, H.; Sugata, T.; Hoshika, H.; Sasaki, Kyuro; Maezono, N.; Kitaguchi, Masaaki; Imamura, N; Yoshida, N.; Tokunaga, Kazutoshi; Fujiwara, Tadashi; Miyamoto, M.; Tokitani, M.; Uehara, K.; Sadamoto, Yoshiro; Nakashima, Y.; Kubota, Yukiho; Higasizono, Y.; Takase, Y.; Ejiri, A.; Shiraiwa, S.; Kado, S.; Sikama, T.; Tsuji‐Iio, S.; Takeda, Tatsuoki; Hirooka, Y.; Ida, K.; Nakamura, Yukio; Fujimoto, Takashi; Iwamae, Atsushi; Maekawa, Takashi; Mitarai, O.

doi:10.1088/0029-5515/45/10/s12

Cited by 63 publications

(31 citation statements)

References 42 publications

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“…From the evaluated I A , we calculated the radially resolved emissivity ε(R) using Abel inversion assuming the toroidal symmetry of the emission. In a tokamak discharge with similar plasma parameters and wall conditions, the variation in H α (p = 2-3) intensity in the toroidal direction was reported to be small except for an approximately 10 times local increase at the poloidal limiter [11]. Since the present discharge is limited by the center stack, the validity of the assumption of the toroidal symmetry could degrade near the center stack.…”

Section: Resultsmentioning

confidence: 65%

Spectroscopic Measurement of Hydrogen Atom Density in a Plasma Produced with 28 GHz ECH in QUEST

Mori

Shikama

Hanada

et al. 2020

Atoms

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The spatial distribution of the hydrogen atom density was evaluated in a spherical tokamak (ST) plasma sustained only with 28 GHz electron cyclotron heating (ECH). The radially resolved Hδ emissivity was measured using multiple viewing chord spectroscopy and Abel inversion. A collisional-radiative (CR) model analysis of the emissivity resulted in a ground-state hydrogen atom density of 1015–1016 m−3 and an ionization degree of 1–0.85 in the plasma.

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Section: Resultsmentioning

confidence: 65%

Spectroscopic Measurement of Hydrogen Atom Density in a Plasma Produced with 28 GHz ECH in QUEST

Mori

Shikama

Hanada

et al. 2020

Atoms

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“…The plasma interacting area is monitored with a CCD camera. Other PFCs as well as the vacuum vessel wall in TRIAM-1M are independently diagnosed [19], as described later in this paper.…”

Section: Experimental Set-up and Diagnosticsmentioning

confidence: 89%

“…TRIAM-1M is a high-field superconducting tokamak (R 0 = 0.8 m, a × b = 0.12 m × 0.18 m) intended for steady state operation (SSTO) [19]. All the PFCs are made of molybdenum and the vacuum vessel is made of stainless steel (SUS 304).…”

Section: Experimental Set-up and Diagnosticsmentioning

confidence: 99%

“…The other PFCs in TRIAM-1M include three D-shaped poloidal limiters (PLs), divertor plates (DPs), cover of bellows, LH antennas and EC steering antenna. The details of all these PFCs can be found in [19].…”

Section: Experimental Set-up and Diagnosticsmentioning

confidence: 99%

“…It has been observed that the hot spot is not formed on the ML surface with the same amount of total RF power for such type of discharge duration and ML location while using only the lower hybrid forward current drive system. blackbody radiation spectrum in the wavelength range of 900-1600 nm using the following two-temperature model equation [19,25]:…”

Section: Formation Of 'Hot Spot' On ML Surfacementioning

confidence: 99%

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A study on temperature effects on hydrogen recycling and molybdenum impurity emission from a movable limiter in TRIAM-1M Tokamak

et al. 2007

Self Cite

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In order to investigate the surface temperature effects on plasma fuel recycling and impurity release from the plasma facing components, plasma discharges have been performed under selected plasma–wall interaction (PWI) conditions in the high-field superconducting tokamak, TRIAM-1M. By moving a water-cooled molybdenum movable limiter (ML) beyond the last closed flux surface, as defined by poloidal limiters, the surface temperature profile on it is varied. Hot spots have been observed on the ML surface in such conditions. The release behaviour of fuel as well as impurity particles from the ML surface has been studied as a function of hot spot temperature (Thot) by means of wide range spectroscopy (200–1600 nm). A critical Thot is found to be ∼2100 K above which the emission of both hydrogen and impurity particles enhances significantly. This is indicative of some thermally activated process playing an important role in PWIs between the limiter and the edge plasma. With the rise in hot spot temperature localized PWI at the ML is found to dominate the global recycling even when external fuelling is stopped.

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Fusion Energy Harnessing, Reactor Technology, and Sustainability

Dobran¹

2017

Kirk-Othmer Encyclopedia of Chemical Technology

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The energy produced from the controlled thermonuclear fusion of hydrogen isotopes can replace fossil fuels and become a sustainable energy source. The fusion of deuterium and tritium has been achieved in several experimental reactors where the plasmas are confined with magnetic fields and there is high optimism that this will also be achieved with laser and ion beams. The plasma confinements and reactor technologies of tokamaks and stellarators are paving the way for building demonstration fusion reactors and subsequently commercial fusion power plants. Following a review of the magnetic and inertial plasma confinement concepts, the reactor technologies that implement these concepts are assessed for producing sustained plasma ignition, external plasma heating, control of plasma instabilities, developments of low‐activation and high strength materials, coolants for removing fusion energy from the reactor, and breeding tritium in the blanket of the reactor for achieving fuel self‐sufficiency. Sustainability of fusion energy requires the long‐term availability of fusion fuels and reactor components materials, social acceptability, minimization of waste products, and safe operation of fusion power plants. These and other issues considered strongly suggest that the fusion energy will become a viable energy source for human development.

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Steady-state tokamak operation, ITB transition and sustainment and ECCD experiments in TRIAM-1M

Cited by 63 publications

References 42 publications

Spectroscopic Measurement of Hydrogen Atom Density in a Plasma Produced with 28 GHz ECH in QUEST

Spectroscopic Measurement of Hydrogen Atom Density in a Plasma Produced with 28 GHz ECH in QUEST

A study on temperature effects on hydrogen recycling and molybdenum impurity emission from a movable limiter in TRIAM-1M Tokamak

Fusion Energy Harnessing, Reactor Technology, and Sustainability

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