Radial Compression of a Compact Toroid Caused by Induction of a Paramagnetic Field
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LEAR FUSION
Radial Compression of a Compact Toroid Caused by Induction of a Paramagnetic Field1 D. Twaroga,* aThe
Henryk Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, 31-342 Poland *e-mail: [email protected] Received November 2, 2017; revised November 2, 2017; accepted November 20, 2017
Abstract—Partially ionized and weakly magnetized plasma (typical for MHD generators) flows along the outer spherical chamber, and is placed around the inner chamber where an field reversed configuration (FRC) is injected. Inside the outer chamber, the azimuthal E r × B drift induces a paramagnetic field B p , with an intensity of tens of Teslas. The intensity of the B p field is controlled by the inwardly directed radial electric field E r . Inside the inner chamber the B p field becomes anti-parallel to the external magnetic field Bem . After establishing the magnetic mirror configuration of magnetic field intensity B p ~ 20 T (in the mid-plane), the FRC (target plasma) is injected into the magnetic mirror with the help of a magnetic wave generator. Inside the magnetic mirror (inner chamber), the rotating magnetic field (RMF) induces the azimuthal current jω inside the FRC. This current gives the magnetic field B j an intensity of dozens of Teslas. This field is antiparallel to the B p field. Interaction between magnetic fields, B p and B j , causes radial compression of the injected FRC. As a result of the magnetic compression, the product of density and the energy confinement time amounts to 1.72 × 1019 s/m3 , which is close to the level expected for the working reactor (~1020 s/m3 ). Detailed analyses reveal that the compressed plasma (compact toroid) is very stable, the kinetic stability condition is fulfilled (S */ε ≅ 0.28), and the ratio α is very low: (~8.6 × 10−2 ) . This makes the most destructive rotational modes, n = 1 and n = 2 , harmless. Keywords: compact toroid, field reversed configuration, paramagnetic field, compression, magnetized plasma DOI: 10.1134/S1063778818100186
INTRODUCTION The purpose of this paper is to introduce the reader to the novel theoretical concept based on the Pulsed High Density (PHD) fusion reactor. In this concept, the same as in the PHD the Field Reversed Configuration (FRC) is formed about 25 meters away from the “spherical” burning chamber and than accelerates by the magnetic wave generator from the left side of the system to the “spherical” chamber. The conversion of the FRC directed energy into thermal energy occurs only after the FRC has reached the burn chamber where the FRC is slowed and compressed to fusion conditions [1–6]. Major difference between proposed concept and well known the PHD is based on a fact that in discussed solution high magnetic field (~30 T), is not generated by superconducting magnets but by the paramagnetic field induced inside outer plasma mantle flowing along burning chamber. 1 The article is published in the original.
Proposed concept is presented in Fig. 1 it is a simple spherical structure, compose from two coaxia
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