First Plasma in the RT-1 Device

Yoshida, Zensho; Ogawa, Yuichi; Morikawa, Junji; Watanabe, Sho; Yano, Yoshihisa; Mizumaki, S.; Tosaka, Taizo; Ohtani, Y.; Hayakawa, A.; Shibui, M.

doi:10.1585/pfr.1.008

Cited by 55 publications

(38 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…I NTERNAL ring devices have been constructed for exploring the high beta ( 100%) plasma confinements based on new relaxation theories at the University of Tokyo [1], [2] and Massachusetts Institute of Technology [3]. Magnetically levitated superconducting coils operated in persistent current mode can be used as an internal coil so that current-leads and support structures do not influence plasma confinement.…”

Section: Improvements Of Current Decay Behavior Of Hts Coils In Persimentioning

confidence: 99%

Improvements of Current Decay Behavior of HTS Coils in Persistent Current Operations

Hemmi

Yanagi

Seo

et al. 2007

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

In order to improve the current decay behavior of high-temperature superconducting (HTS) coils using silversheathed Bi-2223 tapes in persistent current operations, the effect of the shielding current on the current decay behavior has been studied for magnetically levitated superconducting coils in internal ring devices. Generally, the current decay behavior of HTS coils is evaluated by the inductance of the HTS coils, the joint resistance and electric field versus current density relationship of the HTS tapes. In this paper, the effect of shielding currents in HTS tapes is discussed. It is shown that improvements of their properties of HTS tapes, which are the n-value and the critical current, are not so effective to decrease the shielding current in HTS tapes. Numerical electromagnetic analysis using finite element method and experiments have been carried out. Furthermore, improvements of the current decay behavior using excitation techniques are discussed.Index Terms-Current decay behavior, high-temperature superconducting coil, internal ring device, persistent current operation.

show abstract

Section: Improvements Of Current Decay Behavior Of Hts Coils In Persimentioning

confidence: 99%

Improvements of Current Decay Behavior of HTS Coils in Persistent Current Operations

Hemmi

Yanagi

Seo

et al. 2007

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

show abstract

“…The dipole confinement concept to simulate a magnetosphere in laboratory conditions was originally proposed by Hasegawa [1]. Presently, there are active experiments on the plasma creation, confinement and heating in devices such as Levitated Dipole eXperiment (LDX) [2,3] and Ring Trap 1 (RT-1) [4][5][6][7]. The RT-1 device is a laboratory dipole magnetosphere (LDM) created by a levitated superconducting ring magnet.…”

Section: Introductionmentioning

confidence: 99%

Cyclotron Electromagnetic Instabilities in a Laboratory Dipole Magnetospheric Plasma with bi-Kappa Distributions

Grishanov

Azarenkov

Lazar

2017

Plasma and Fusion Research

View full text Add to dashboard Cite

The transverse dielectric susceptibility elements are derived for electromagnetic cyclotron waves in an axisymmetric laboratory dipole magnetosphere accounting for the cyclotron and bounce resonances of trapped and untrapped particles. A bi-Kappa (or bi-Lorentzian) distribution function is invoked to model the energetic particles with anisotropic temperature. The steady-state two-dimensional (2D) magnetic field is modeled by laboratory dipole approximation for a superconducting ring current of finite radius. Derived for field-aligned circularlypolarized waves the dispersion relations are suitable for analyzing both the whistler instability in the range below the electron-cyclotron frequency, and the proton-cyclotron instability in the range below the ion-cyclotron frequency. The instability growth rates in the 2D laboratory magnetosphere are defined by the contributions of energetic particles to the imaginary part of transverse susceptibility.

show abstract

“…Magnetospheric plasma confinement in laboratory was proposed as an advanced fuel fusion system. 25 Such a system was also realized by using a levitated superconducting coil, 26,27 although measurement data of pressure anisotropy have not been reported.…”

Section: Introductionmentioning

confidence: 99%

Effects of pressure anisotropy on magnetospheric magnetohydrodynamics equilibrium of an internal ring current system

Furukawa

2014

Physics of Plasmas

View full text Add to dashboard Cite

Effects of pressure anisotropy on magnetospheric magnetohydrodynamics equilibrium are studied analytically and numerically, where the plasma is confined by only poloidal magnetic field generated by an internal ring current. The plasma current due to finite pressure can be divided into two components; one remains at isotropic pressure and the other arises from pressure anisotropy. When p⊥, the pressure perpendicular to the magnetic field, is larger than p∥, the pressure parallel to the magnetic field, those two components of plasma current tend to cancel each other to reduce the total amount of plasma current. Equilibrium beta limit is also examined, where the beta is a ratio of the plasma pressure to the magnetic pressure. The equilibrium beta limit decreases as the pressure anisotropy becomes strong. The beta value is strictly limited by ellipticity of the equilibrium equation when p∥>p⊥. On the other hand, when p⊥>p∥, although the tendency of the beta limit agrees with the ellipticity condition of the equilibrium equation, equilibria with a hyperbolic region can be obtained by iterative procedure with practically reasonable convergence criteria.

show abstract

First Plasma in the RT-1 Device

Cited by 55 publications

References 7 publications

Improvements of Current Decay Behavior of HTS Coils in Persistent Current Operations

Improvements of Current Decay Behavior of HTS Coils in Persistent Current Operations

Cyclotron Electromagnetic Instabilities in a Laboratory Dipole Magnetospheric Plasma with bi-Kappa Distributions

Effects of pressure anisotropy on magnetospheric magnetohydrodynamics equilibrium of an internal ring current system

Contact Info

Product

Resources

About