Equilibrium properties on the EAST superconducting tokamak

2009 ◽  
Vol 75 (3) ◽  
pp. 337-344 ◽  
Author(s):  
J. P. QIAN ◽  
B. N. WAN ◽  
L. L. LAO ◽  
B. SHEN ◽  
S. A. SABBAGH ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Toroidal Magnetic Field ◽  
Plasma Equilibrium ◽  
Major Radius ◽  
Superconducting Tokamak

AbstractThe Experimental Advanced Superconducting Tokamak (EAST) has a major radius of R0 = 1.75 m and a midplane halfwidth of 0.5 m. It has been operated with a toroidal magnetic field B0 = 2 T and Ip ≤ 500 kA. The evolution of the plasma equilibrium is analysed between discharges by Equilibrium Fitting Code (EFIT). Limiter, single-null and double-null diverted configurations have been produced. A plasma elongation in the range 1.3 ≤ κ ≤ 1.9 and a triangularity in the range 0.1 ≤ δ ≤ 0.55 have been sustained. The operation space of elongated discharges is also presented based on the EAST database.

Development of a novel spiral antenna system for low loop voltage current start up atSteady State Superconducting Tokamak(SST-1).

2021 ◽  
Author(s):  
Debjyoti Basu ◽  
D Raju ◽  
Raj Singh ◽  
Aparajita Mukherjee ◽  
Manoj Patel ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Antenna System ◽  
Toroidal Magnetic Field ◽  
Vacuum Vessel ◽  
Plasma Current ◽  
Test Results ◽  
Spiral Antenna ◽  
Start Up ◽  
Superconducting Tokamak

Abstract In general, superconducting tokamaks require low loop voltage current start up for the safety purpose of its poloidal field coils. The loop voltage inside the vacuum vessel of Steady-state Superconducting Tokamak (SST-1) is low in nature since its central solenoid is located outside the cryostat. The low loop voltage current start up of the SST-1 is routinely performed by Electron Cyclotron Resonance (ECR) method at the toroidal magnetic field Bt=1.5T(first harmonic) and 0.75T(second harmonic). Recently, an alternative RF based plasma current start up system had been planned for operating the machine specially for higher toroidal magnetic field regime 1.5T ≤ Bt ≤3T. The system is already developed based on an antenna system, made of series combinations of two at spiral antenna, to assist plasma current start up at lower inductive electric field. It is already tested and installed in SST-1 chamber. The system testing had been performed without background magnetic field within frequency regime 35-60MHz at present. The test results show that it can produce electron density ne ≈1016m-3 measured by the Langmuir probe in expense of 500W RF power. The spectroscopy results indicate that its capability to produce plasma density higher than 1013 m-3 and electron temperature Te = 2 -6eV. In addition, it also shows that the presence of turbulent electric field of the order of 106V/m at antenna center and finite anomalous temperature of neutral particles. Calculations show that the obtained density is enough for SST-1 low loop voltage plasma breakdown. The antenna system is also capable to produce plasma at higher frequencies. This article will discuss the development of the prototype and the installed antenna system along with their test results in detail.

Features of the Radial and Axial Distributions of the Toroidal Magnetic Field in the Axial Jet Ejection at the PF-3 Facility

2021 ◽  
Vol 47 (9) ◽  
pp. 912-937
Author(s):  
V. I. Krauz ◽  
K. N. Mitrofanov ◽  
V. V. Myalton ◽  
I. V. Il’ichev ◽  
A. M. Kharrasov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Toroidal Magnetic Field

Nonaxisymmetric Instabilities of a Toroidal Magnetic Field in a Rotating Sphere

2003 ◽  
Vol 585 (2) ◽  
pp. 1124-1137 ◽  
Author(s):  
Keke Zhang ◽  
Xinhao Liao ◽  
Gerald Schubert
Keyword(s):  
Magnetic Field ◽  
Toroidal Magnetic Field ◽  
Rotating Sphere

New Lens System Using Toroidal Magnetic Field for Intense Ion Beam

1977 ◽  
Vol 16 (3) ◽  
pp. 491-496 ◽  
Author(s):  
Akihiro Mohri ◽  
Kazunari Ikuta ◽  
Junji Fujita
Keyword(s):  
Magnetic Field ◽  
Ion Beam ◽  
Toroidal Magnetic Field ◽  
Lens System

Buckling of a Superconducting Ring in a Toroidal Magnetic Field

1979 ◽  
Vol 46 (1) ◽  
pp. 151-155 ◽  
Author(s):  
F. C. Moon
Keyword(s):  
Magnetic Field ◽  
Theoretical Model ◽  
Toroidal Magnetic Field ◽  
Magnetic Fusion ◽  
Poloidal Field ◽  
Superconducting Ring ◽  
Tokamak Reactors ◽  
Linear And Nonlinear ◽  
Mode A ◽  
Theory And Experiment

Experimental evidence and a theoretical model are presented for the magnetoelastic buckling of a rigid superconducting ring in a steady circumferential (toroidal)magnetic field. The theoretical model predicts a coupled translation and pitch displacement of the coil in the buckled mode. A discussion is given of both the linear and nonlinear magnetic perturbation forces. The experiments were conducted in liquid helium (4.2°K). The lowest natural frequency of the rigid coil on elastic springs was observed to decrease near the buckling current. Agreement between theory and experiment is fair. These results may have design implications for poloidal field coils in magnetic fusion Tokamak reactors.

Fusion triple product increase in ten times in the compact spherical tokamak Globus-M2 due the doubling of the toroidal magnetic field

2021 ◽  
Author(s):  
Gleb Kurskiev ◽  
Vasily K Gusev ◽  
Nikolay Sakharov ◽  
I M Balachenkov ◽  
Nikolai Nikolaevich Bakharev ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Triple Product ◽  
Toroidal Magnetic Field ◽  
Spherical Tokamak ◽  
Product Increase
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