Internal magnetic field measurements of translated and merged field-reversed configuration plasmas in the FAT-CM device

Gota, H.; Ishiwata, Jumpei; Tanaka, Fumiyuki; Hosozawa, Akiyoshi; Asai, Tomohiko; Takahashi, Toshimi; Sekiguchi, Junichi; Roche, T.; Matsumoto, T.; Dettrick, Sean; Mok, Y.; Binderbauer, Michl; Tajima, T.

doi:10.1063/1.5036997

Cited by 16 publications

(15 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Magnetic measurements on the C-2 and FAT-CM device during the quiescence phase of collisional merging with theta-pinch formed FRCs [3,4,8,21] reveal having a different type of FRCs than RMF-FRCs. To give a comparison, all four models have identical B e = 0.1 T to simulate conditions of the C-2 device measurement [8].…”

Section: Comparison Of Profiles For Collisional Merging Frcmentioning

confidence: 89%

See 1 more Smart Citation

Generalized radial profile of field-reversed configurations based on symmetrical properties

Lee¹

2020

Nucl. Fusion

View full text Add to dashboard Cite

Field-reversed configurations (FRC) exhibit several remarkable symmetrical properties. In the idealized FRC, B z at the geometric axis and separatrix are of the same value but have opposite signature. The total poloidal flux at the inner field-lines (geometric axis to the O-point) is equal to that of the outer field-lines (O-point to the separatrix), which perfectly cancels out so that there remains zero flux at the separatrix. With these properties, a semi-analytical model of the radial profile is constructed. The symmetric (SYM) model begins with an analytical description of the current density profile j θ (r) having symmetric features. The model then takes into account of finite current at the separatrix that brings in asymmetric features. It is the combination of these two attributes, which determine the radial profile for the SYM model. This gives a generalized description that is applicable to a wide range of FRC settings for peaked and hollow current density profiles. Comparisons are made with the well-known rigid rotor (RR), two-point equilibrium (2PE), and Cobb et al model for two cases: (1) FRC behaves more symmetrically for conditions when B z at the geometric axis (B s ) is almost equal to B e , and (2) asymmetric when B s is lower than B e . A possible equilibrium profile for high performance FRCs at B e = 0.5 T is also presented.

show abstract

Section: Comparison Of Profiles For Collisional Merging Frcmentioning

confidence: 89%

“…To determine the radial structure of field-reversed configuration (FRC) [1,2] plasmas, internal magnetic probe arrays [3][4][5][6][7][8] have been extensively used. One great importance is that integration of the B z radial profile allows direct measurement of the separatrix radius, which sets the boundary of the FRC from open field-lines.…”

Section: Introductionmentioning

confidence: 99%

Generalized radial profile of field-reversed configurations based on symmetrical properties

Lee¹

2020

Nucl. Fusion

View full text Add to dashboard Cite

show abstract

“…Poloidal flux was estimated from the B z radial profile measured using the internal magnetic probe array. Poloidal flux φ p was defined as follows: where R is the radius of magnetic field neutral position (B z = 0) [9]. Under a constant external magnetic field, the poloidal flux is approximately proposed to the cross sectional area of the plasma, as expressed in Eq.…”

Section: Resultsmentioning

confidence: 99%

Effect of Collision Axes Offset of the Plasmoid in the Collisional Merging Process of FRC Plasma

SOMEYA

ASAI

Kobayashi

et al. 2022

Plasma and Fusion Research

View full text Add to dashboard Cite

In this study, the effect of the collision axes offset in the collisional merging process of field-reversed configuration (FRC) in the FAT-CM (FRC amplification via translation-collisional merging) device was experimentally investigated for the first time. The offset of incident axes during collision does not exhibit any considerable effect on particle inventory and trapped magnetic flux of the merged FRC, which is inconsistent with the results predicted via the three-dimensional magnetohydrodynamic (MHD) simulation using the MHD infrastructure for plasma simulation (MIPS) code. Based on the obtained results, the FRC exhibits robust stability and it does not collapse even when subjected to destructive perturbations during the dynamic translation and collision processes.

show abstract

“…The transition of the internal magnetic field profile in the collisional merging process was experimentally observed on the FAT-CM [13]. The internal magnetic field profile was experimentally observed by an array of pickup coils installed at the midplane where the SXR detector is mounted.…”

Section: Discussionmentioning

confidence: 99%

Soft X-Ray Measurement on the Collisional Merging Process in a Field-Reversed Configuration

Sekiguchi

Asai

Takahashi

2019

Plasma and Fusion Research

View full text Add to dashboard Cite

To investigate excited shockwaves in a collisional-merging field-reversed configuration (FRC), soft X-ray (SXR) measurement was initiated on the FRC amplification via translation collisional merging (FAT-CM) instrument. Since the FRCs collide at a relative speed of 300-400 km/s on the FAT-CM, which is faster than the Alfvén velocity in the separatrix, shockwaves are assumed to be excited in the colliding FRCs. These excited shockwaves would play an important role in energy conversion during the collisional merging formation process of the FRC. The relation between the global behavior of the FRC in the collisional merging process and the time evolution of SXR signals are discussed herein.

show abstract

Internal magnetic field measurements of translated and merged field-reversed configuration plasmas in the FAT-CM device

Cited by 16 publications

References 10 publications

Generalized radial profile of field-reversed configurations based on symmetrical properties

Generalized radial profile of field-reversed configurations based on symmetrical properties

Effect of Collision Axes Offset of the Plasmoid in the Collisional Merging Process of FRC Plasma

Soft X-Ray Measurement on the Collisional Merging Process in a Field-Reversed Configuration

Contact Info

Product

Resources

About