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  • 1
    Online Resource
    Online Resource
    Fast ion charge exchange spectroscopy measurement using a radially injected neutral beam on the large helical device
    AIP Publishing ; 2008
    In:  Review of Scientific Instruments Vol. 79, No. 10 ( 2008-10-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 79, No. 10 ( 2008-10-01)
    Abstract: An experimental technique to investigate fast ion confinement based on charge exchange spectroscopy of Hα-light was applied to evaluate the confinement property of perpendicular fast ions in large helical device (LHD). Sensitivities of the Hα spectra to the pitch angles of injected neutral beams (NBs) and these to the angle between the sight line of the measurement and NB injection path are examined. The energy dependence of the charge exchange cross section significantly affects the observed spectra since the driving NB is injected perpendicular to the magnetic field lines in the geometry of LHD. The measured spectra are compared to the spectra of GNET simulation results and the simulated spectra agreed well with the experimental measurement when we take into account the contribution of halo neutrals. Although it is difficult to obtain the fast ion distribution functions directly, this technique provides useful experimental data in benchmarking simulation codes.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.2968695
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 2
    Online Resource
    Online Resource
    Nonadiabatic behavior of the magnetic moment of a charged particle in a dipole magnetic field
    AIP Publishing ; 1990
    In:  Physics of Fluids B: Plasma Physics Vol. 2, No. 4 ( 1990-04-01), p. 715-724
    Details
    In: Physics of Fluids B: Plasma Physics, AIP Publishing, Vol. 2, No. 4 ( 1990-04-01), p. 715-724
    Abstract: Nonadiabatic behavior of the magnetic moment of a charged particle in a dipole magnetic field is studied both numerically and analytically in the presence of a low-frequency electrostatic wave with an azimuthal component. The adiabaticity can be broken as a result of two types of resonance, i.e., the bounce-E×B drift resonance and the wave-drift resonance.
    Type of Medium: Online Resource
    ISSN: 0899-8221
    URL: Article
    DOI: 10.1063/1.859308
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1990
    detail.hit.zdb_id: 2130787-8
    detail.hit.zdb_id: 648023-8
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  • 3
    Online Resource
    Online Resource
    Neoclassical electron transport calculation by using δf Monte Carlo method
    AIP Publishing ; 2011
    In:  Physics of Plasmas Vol. 18, No. 3 ( 2011-03-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 18, No. 3 ( 2011-03-01)
    Abstract: High electron temperature plasmas with steep temperature gradient in the core are obtained in recent experiments in the Large Helical Device [A. Komori et al., Fusion Sci. Technol. 58, 1 (2010)]. Such plasmas are called core electron-root confinement (CERC) and have attracted much attention. In typical CERC plasmas, the radial electric field shows a transition phenomenon from a small negative value (ion root) to a large positive value (electron root) and the radial electric field in helical plasmas are determined dominantly by the ambipolar condition of neoclassical particle flux. To investigate such plasmas’ neoclassical transport precisely, the numerical neoclassical transport code, FORTEC-3D [S. Satake et al., J. Plasma Fusion Res. 1, 002 (2006)] , which solves drift kinetic equation based on δf Monte Carlo method and has been applied for ion species so far, is extended to treat electron neoclassical transport. To check the validity of our new FORTEC-3D code, benchmark calculations are carried out with GSRAKE [C. D. Beidler et al., Plasma Phys. Controlled Fusion 43, 1131 (2001)] and DCOM/NNW [A. Wakasa et al., Jpn. J. Appl. Phys. 46, 1157 (2007)] codes which calculate neoclassical transport using certain approximations. The benchmark calculation shows a good agreement among FORTEC-3D, GSRAKE and DCOM/NNW codes for a low temperature (Te(0)=1.0 keV) plasma. It is also confirmed that finite orbit width effect included in FORTEC-3D affects little neoclassical transport even for the low collisionality plasma if the plasma is at the low temperature. However, for a higher temperature (5 keV at the core) plasma, significant difference arises among FORTEC-3D, GSRAKE, and DCOM/NNW. These results show an importance to evaluate electron neoclassical transport by solving the kinetic equation rigorously including effect of finite radial drift for high electron temperature plasmas.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.3562890
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 1472746-8
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  • 4
    Online Resource
    Online Resource
    Spatial resolved high-energy particle diagnostic system using time-of-flight neutral particle analyzer in large helical device
    AIP Publishing ; 2003
    In:  Review of Scientific Instruments Vol. 74, No. 3 ( 2003-03-01), p. 1878-1882
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 74, No. 3 ( 2003-03-01), p. 1878-1882
    Abstract: The time-of-flight-type neutral particle analyzer has an ability of horizontal scanning from 40 to 100° of the pitch angle. The information from the spatially resolved energy spectrum gives not only the ion temperature but also the information of the particle confinement and the electric field in plasmas. We have been studying the energy distributions at various magnetic configurations in the neutral beam injection (NBI) plasma. The spatially resolved energy spectra can be observed during long discharges of the NBI plasma by continuous scanning of the neutral particle analyzer. The shape of spectra is almost similar from 44° to 53°. However, the spectra from 55° are strongly varied. They reflect the injection pitch angle of the beam. The pitch angle scanning experiment during the long discharge of NBI plasma has also been made under the reversal of the magnetic field direction. NBI2 becomes counter injected with the reversal. We can easily observe the difference between co- and counter injections of NBI. During the electron cyclotron heating in the low-density plasma for the formation of the internal thermal barrier, large neutral particle increase or decease can be observed. The degree of the increase/decrease depends on the energy and the density. The reason for the variation of the particle flux is that the orbit of the trapped particle changes due to the electric field formed by the strong electron cyclotron heating.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.1537883
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2003
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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