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Tetsuo SEKI, Hiroshi Kasahara, Ryosuke Seki, Kenji Saito et autres
Abstract Long pulse discharge experiments have been conducted at LHD as one of the challenges in the quest for a fusion reactor. The plasma could be sustained for 48 min, using 1.2 MW of heating power from the ion cyclotron range of …
jp, fr, us (code pays fourni par la source)
M. Shoji, Hiroshi Kasahara, Tesuo Seki, R. Seki et autres
Abstract This paper reviews the contributions of image observations to extending the duration of Ion Cyclotron Range of Frequencies (ICRF)-heated long-pulse discharges in the Large Helical Device (LHD). The plasma discharges were monitored using over 25 visible cameras, three fast-framing cameras, and …
jp (code pays fourni par la source)
V.Е. Moiseenko, Yu.V. Kovtun, Hiroshi Kasahara, Tetsuo SEKI et autres
Plasma production in stellarators with ion cyclotron heating is complementary to the widely used electron cyclotron heating (ECRH). The prospective light ion minority scenario developed and tried on Uragan-2M and Large Helical Device (LHD) stellarators had been reexamined at LHD. The distinctive …
se, ua, jp, fr, us, de, es (code pays fourni par la source)
S. Masuzaki, M. Shoji, F. Nespoli, R. Lunsford et autres
In the Large Helical Device (LHD), boronization is utilized for wall conditioning, employing two distinct methods: glow discharge using diborane gas and the injection of boron powder into the plasma via an impurity powder dropper (IPD). Glow discharge boronization is conducted after …
jp, us (code pays fourni par la source)
Yu.V. Kovtun, S. Kamio, V.Е. Moiseenko, Hiroshi Kasahara et autres
Abstract The results of the first experimental series to produce a plasma using the radio frequency discharge (RF) above the ion cyclotron frequency at relatively low magnetic fields (0.5–0.6 T) in the Large Helical Device (LHD) are presented 1.43 MW of RF …
ua, us, se, jp, de (code pays fourni par la source)
D. Moseev, M. Zanini, Hiroshi Kasahara, H. P. Laqua et autres
Abstract Sawtooth oscillations in tokamaks frequently lead to the redistribution of energetic ions, mainly on passing orbits, causing their expulsion from the core. This paper discusses the first measurements of the interaction of fast ions and sawteeth in the Large Helical Device. …
de, jp, us, dk (code pays fourni par la source)
Dan Du, Kenji SAITO, J.G. Kwak, T. Seki et autres
Abstract It is crucial to correctly predict the S-matrix with plasma and set the optimal impedance matching device in the ion cyclotron resonance heating (ICRH) antenna system design. In this paper, a hybrid circuit/3DLHDAP code to verify the S-matrix measurements in the …
cn, jp, kr (code pays fourni par la source)
Hiroshi Kasahara, Tetsuo SEKI, Kenji Saito, Dimitry MOSEEV et autres
A minority ion ratio in fast wave heating for the ion cyclotron range of frequencies affects plasma heating mechanisms and mode conversion ratios to short waves in a mixed plasma. The mode conversion region and these wave absorption profiles are functions of …
jp, de (code pays fourni par la source)
Yu.V. Kovtun, Hiroshi Kasahara, V.Е. Moiseenko, S. Kamio et autres
Abstract This study aim is to develop further an ion cyclotron range of frequencies (ICRF) method of plasma production in stellarators based on the minority heating. The previous studies demonstrate production of low density plasma (9.5 × 1017m−3) at low power of …
ua, jp, us, de, es, be (code pays fourni par la source)
M. Nunami, Atsushi M Ito, M. Goto, Hiroki Hasegawa et autres
The understanding of nature has been developed by separating and connecting elements in a reductive manner. For example, a spatio-temporal scale can provide us a clear picture of elemental separations. In biology, a function also gives us a useful picture to understand …
jp (code pays fourni par la source)
Yu.V. Kovtun, V.Е. Moiseenko, S. Kamio, Hiroshi Kasahara et autres
This report compares results ion-cyclotron range of frequencies (ICRF) plasma production at hydrogen minority regime in Uragan-2M (U-2M) and Large Helical Device (LHD). The condition of the presence of the fundamental harmonic ion cyclotron resonance zone for the hydrogen inside the plasma …
cz, se, ua, us, jp, de (code pays fourni par la source)
Hiroshi Kasahara, Kenji Saito, Tetsuo SEKI, T. Mutoh
Although ICRF heating has achieved the high heating efficiency necessary to achieve high-performance plasmas, it has not overcome the reliability and economic problems associated with the antenna structure inside the vacuum vessel in fusion reactors. We suggested a slit ICRF antenna that …
jp (code pays fourni par la source)
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