Sources of Fluctuating Field on Field-Reversed Configuration Plasma

Kumashiro, Shinichi; Takahashi, Takeshi; Ooi, Masanobu; Takahashi, Tsutomu; Shimamura, S.; Nogi, Yasuyuki

doi:10.1143/jpsj.62.1539

Cited by 14 publications

(11 citation statements)

References 18 publications

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“…[17][18][19][20][21] However, most of these experimental observations were performed using magnetic pickup coils arranged just inside or outside of the chamber wall, at a distance from the separatrix. [17][18][19][20][21] However, most of these experimental observations were performed using magnetic pickup coils arranged just inside or outside of the chamber wall, at a distance from the separatrix.…”

Section: Introductionmentioning

confidence: 99%

Tomographic reconstruction of deformed internal structure of a field-reversed configuration

et al. 2006

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Visible bremsstrahlung tomographic diagnostic for the pulsed high density field-reversed configuration experiment Rev. Sci. Instrum. 77, 10F319 (2006); 10.1063/1.2220018Modeling of field-reversed configuration experiment with large safety factora) Phys. Plasmas 13, 056119 (2006); 10.1063/1.2177635 Rotating magnetic quadrupole current drive for field-reversed configurationsDeformation of the internal structure of a field-reversed configuration ͑FRC͒ was studied using a tomographic reconstruction technique. A simple and configurable tomographic system was developed, with which the time evolution of the FRC internal structure was reconstructed. In the latter phase of equilibrium, a FRC has a well-known global rotational instability with toroidal mode number n = 2. It has been believed that elliptical deformation of the FRC allows interaction between the wall and the plasma, which terminates this configuration. However, these experiments revealed the FRC to deform into a dumbbell-like structure before the edge hits the chamber wall, leading to the disruption phase. In addition, an internal shift ͑toroidal mode number n =1͒ mode was observed in the equilibrium phase, followed by growth of n = 2 rotational instability.

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Section: Introductionmentioning

confidence: 99%

Tomographic reconstruction of deformed internal structure of a field-reversed configuration

et al. 2006

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“…This kind of occurrence of the B T field has also been observed in PRC plasma and the strength at the central surface of the device has been expressed as [23,24] F is the tilt angle of the plasma with respect to the z-axis.…”

Section: Cause Of External Magnetic Field Swingmentioning

confidence: 72%

Highly elongated, low-aspect-ratio tokamak produced by negative-biased theta pinch

2001

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Ultra Low Aspect Ratio Tokamaks (ULART) are produced by using a negative‐biased theta‐pinch device. A slender conducting rod which serves as a toroidal field coil is newly installed along a geometrical center axis of the theta‐pinch coil. The ULART is quickly formed for about 10 μs by applying programmed current flows from three sets of fast banks and a slow bank to these coils and is sustained for about 100 μs. The plasma diagnosed from a magnetic probe array has a low aspect ratio A = 1.1 and a poloidal surface with a high elongation ratio κ = 10. The safety factor reaches about 30 near the separatrix edge when Ip = 280 kA flows in the plasma and Itfc = 30 kA in the conducting rod. A preliminary result on global MHD characteristics of the ULART is also given. The plasma is unstable with respect to a vertical displacement and a toroidal n = 1 mode. The amplitudes of these modes depend on the values of Itfc and κ. © 2001 Scripta Technica, Electr Eng Jpn, 134(4): 19–27, 2001

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“…Experimental and theoretical studies of FRC stability have mainly focused on elongated (E > 1) and oblate (0 < E < 1) FRC plasmas, formed by the FRTP (Slough & Hoffman, (1993), Fujimoto et al, 2002;Tuszewski, et al, 1990;Tuszewski et al, 1991;Kumashiro et al,1993;Asai et al, 2006) and CHSW methods (Yamada et al, 1990;Ono et al, 1993;Gerhardt et al 2008), respectively. Details of the two methods are introduced in the next section.…”

Section: Formation Methods For Frc Plasmamentioning

confidence: 99%

“…The m/n=1/1 tilt mode instability is thought to be most dangerous. The stability of prolate and oblate FRC plasma has been investigated experimentally on several FRTP www.intechopen.com devices (FRX-C/LSM (Tuszewski et al, 1990(Tuszewski et al, , 1991, LSX, (Slough & Hoffman, 1993), NUCTE-III (Kumashiro et al, 1993;Asai et al, 2006;Ikeyama et al, 2008), etc. ), and on spheromak-merging facilities such as the TS-3 (Ono et al, 1993) and MRX (Gerhardt et al, 2006).…”

mentioning

confidence: 99%

“…), and on spheromak-merging facilities such as the TS-3 (Ono et al, 1993) and MRX (Gerhardt et al, 2006). In addition, the stability of prolate and oblate FRCs has been analyzed by means of visible and x-ray photography with an end-on camera (Slough & Hoffman, 1993;Tuszewski et al, 1991), computer tomography reconstruction of the visible emission profile (Asai et al, 2006), as well as mode analysis of the external B  -magnetic probe array (Mirnov coil array) (Slough & Hoffman, 1993;Tuszewski et al, 1990Tuszewski et al, , 1991Kumashiro et al, 1993;Ikeyama et al, 2008) and the internal magnetic probe array (Ono et al, 1993;Gerhardt et al, 2006).…”

mentioning

confidence: 99%

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