Overview of the Large Helical Device project

Iiyoshi, A.; Komori, A.; Ejiri, A.; Emoto, M.; Funaba, H.; Goto, M.; Ida, K.; Idei, H.; Inagaki, S.; Kado, S.; Kaneko, O.; Kawahata, K.; Kobuchi, T.; Kubo, S.; Kumazawa, R.; Masuzaki, S.; Minami, Takashi; Miyazawa, J.; Morisaki, T.; Morita, S.; Murakami, S.; Muto, S.; Mutoh, T.; Nagayama, Y.; Nakamura, Yuji; Nakanishi, Hiroyuki; Narihara, K.; Nishimura, K.; Noda, N.; Ohdachi, S.; Ohyabu, N.; Oka, Y.; Osakabe, M.; Ozaki, T.; Peterson, B.J.; Sagara, A.; Sakakibara, S.; Sakamoto, R.; Sasao, H.; Sasao, M.; Sato, K.; Sato, Motohiro; Seki, T.; Shimozuma, Τ.; Shoji, M.; Suzuki, H.; Takeiri, Y.; Tanaka, K.; Toi, K.; Tokuzawa, T.; Tsumori, K.; Tsuzuki, K.; Watanabe, K. Y.; Watari, T.; Yamada, H.; Yamada, I.; Yamaguchi, S.; Yokoyama, M.; Akiyama, R.; Chikaraishi, H.; Haba, K.; Hamaguchi, Satoshi; Iima, M.; Imagawa, S.; Inoue, Noriyuki; Iwamoto, K.; Kitagawa, S.; Kodaira, J.; Kubota, Yoshinobu; Maekawa, R.; Mito, T.; Nagasaka, Tetsuya; Nishimura, A.; Takahashi, C.; Takahata, K.; Takita, Y.; Tamura, H.; Tsuzuki, T.; Yamada, S.; Yamauchi, K.; Yanagi, N.; Yonezu, H.; Hamada, Y.; Matsuoka, K.; Murai, K.; Ohkubo, Κ.; Ohtake, I.; Okamoto, Masayuki; Satoh, Shuichi; Satow, T.; Sudo, S.; Tanahashi, S.; Yamazaki, K.; Fujiwara, Masami; Motojima, O.

doi:10.1088/0029-5515/39/9y/313

Cited by 266 publications

(107 citation statements)

References 12 publications

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“…The density increase rate also has a flat profile. The beam fueling calculated by the FIT code [14] is consistent with the experimental results, and is also shown in Fig. 2 (b).…”

Section: Resultssupporting

confidence: 85%

Ion Heating Experiments Using Perpendicular Neutral Beam Injection in the Large Helical Device

Nagaoka

Yokoyama

Takeiri

et al. 2008

Plasma and Fusion Research

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A perpendicular neutral beam (P-NB) injector was installed in the Large Helical Device (LHD) and utilized for high-power ion heating and measurement of the ion temperature (T i ) profile by charge exchange spectroscopy. Significant progress was achieved in ion heating experiments using P-NB, and a high T i of 5.2 keV was achieved at the plasma center. A T i peak profile with a steep gradient in the core region was observed, indicating an improved mode of ion transport. The enhancement of toroidal flow in the core region was observed with the T i rise. Transport analysis shows improvement in anomalous transport in the core region, and the neoclassical transport remains unchanged when the high T i is realized.

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“…The density increase rate also has a flat profile. The beam fueling calculated by the FIT code [14] is consistent with the experimental results, and is also shown in Fig. 2 (b).…”

Section: Resultssupporting

confidence: 85%

Ion Heating Experiments Using Perpendicular Neutral Beam Injection in the Large Helical Device

Nagaoka

Yokoyama

Takeiri

et al. 2008

Plasma and Fusion Research

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“…The amplitude increase ρ < 0.45 is higher than the amplitude decay ρ > 0. 45. This is a clear proof that the quadratic non-linearity exists; that it is dominant at ρ = 0.45; and that at this frequency range the amplitudes differences between |f 1 ± f 2 | is small showing little dynamics.…”

Section: Spatial Distributionmentioning

confidence: 72%

“…Experimental results in this paper are presented for the Large Helical Device (LHD) [45]. LHD's major radius R major = 3.5 ∼ 3.9 m and effective (averaged) minor radius is a 99 = 0.6 m such that ρ is defined by r eff /a 99 where r eff denotes the effective radius [46].…”

Section: Set-up and Experimental Conditionsmentioning

confidence: 99%

New evidence and impact of electron transport non-linearities based on new perturbative inter-modulation analysis

et al. 2017

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Abstract.A new methodology to analyze non-linear components in perturbative transport experiments is introduced. The methodology has been experimentally validated in the Large Helical Device (LHD) for the electron heat transport channel. Electron cyclotron resonance heating (ECRH) with different modulation frequencies by two gyrotrons have been used to directly quantify the amplitude the non-linear component at the inter-modulation frequencies. The measurements show significant quadratic non-linear contributions, but also the absence of cubic and higher order components. The non-linear component is analyzed using Volterra series, which is the non-linear generalization of transfer functions. This allows to study the radial distribution of the non-linearity of the plasma and to reconstruct linear profiles in the case the measurements were not distorted by non-linearities. The reconstructed linear profiles are significantly different from the measured profiles showing the significant impact the non-linearity can have.

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“…In the last decade, the Asian fusion programme has made impressive progress with modern tokamaks in Korea (KSTAR [18]), China (EAST [19]), India (SST-1 [20]). Japan has a long tradition in fusion development and houses the largest helical system at present, LHD, a heliotron [21]. Japan is now constructing a large tokamak, JT-60 SA [22].…”

Section: -Status Of Fusion Energy Developmentmentioning

confidence: 99%

Physics of magnetic confinement fusion

Wagner

2013

EPJ Web of Conferences

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Summary. -Fusion is the energy source of the universe. The local conditions in the core of the Sun allow the transfer of mass into energy, which is finally released in the form of radiation. Technical fusion melts deuterons and tritons to helium releasing large amounts of energy per fusion process. Because of the conditions for fusion, which will be deduced, the fusion fuel is in the plasma state. Here we report on the confinement of fusion plasmas by magnetic fields. Different confinement concepts -tokamaks and stellarators-will be introduced and described. The first fusion reactor, ITER, and the most modern stellarator, Wendelstein 7-X, are under construction. Their basic features and objectives will be presented. -IntroductionEnergy is the most important commodity man needs on Earth. It provides mankind with food and energy makes it largely independent of the perils of nature. It is not astonishing that energy consumption rose in the last centuries in parallel to the number of inhabitants on Earth. The relation between consumed energy and population is about quadratic because the per-capita energy consumption also increases over the years. It is expected that energy consumption will double till 2050 as a consequence of the population EPJ Web of Conferences

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Overview of the Large Helical Device project

Cited by 266 publications

References 12 publications

Ion Heating Experiments Using Perpendicular Neutral Beam Injection in the Large Helical Device

Ion Heating Experiments Using Perpendicular Neutral Beam Injection in the Large Helical Device

New evidence and impact of electron transport non-linearities based on new perturbative inter-modulation analysis

Physics of magnetic confinement fusion

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