Ion Flow Measurements and Plasma Current Analysis in the Irvine Field Reversed Configuration

  title={Ion Flow Measurements and Plasma Current Analysis in the Irvine Field Reversed Configuration},
  author={W. S. Harris and E. Trask and Thomas Roche and Eusebio P. Garate and William W. Heidbrink and R. Mcwilliams},
  journal={Bulletin of the American Physical Society},
Measurements of the Doppler shift of impurity lines indicate that there is an ion flow of ∼7 km/s in the Irvine Field Reversed Configuration. A charge-exchange neutral particle analyzer shows the peak energy is below the 20 eV minimum detectable energy threshold, which is in agreement with the spectroscopic data. By evaluating the collision times between the impurities and hydrogen, the dominant plasma ion species, it is concluded that the ions rotate with an angular frequency of ∼4×104 rad/s… 

Spectroscopic measurement of ion temperature and ion velocity distributions in the flux-coil generated FRC.

An optical diagnostic was developed to simultaneously measure the Doppler velocity-shift and line-broadening using a 0.75 m, 1800 groves/mm, spectrometer to establish the plasma where the ion rotational energy is greater than the ion thermal energy.

Toroidal Flow Velocity Measurement in the STOR-M Tokamak by Ion Doppler Spectroscopy

An Ion Doppler Spectrometer (IDS) was built for the purpose of toroidal ion flow velocity measurement in the STOR-M tokamak. Emission lines from carbon and oxygen ions CIII, OV and CVI were used for

Hybrid magneto-hydrodynamic simulation of a driven FRC

We simulate a field-reversed configuration (FRC), produced by an “inductively driven” FRC experiment; comprised of a central-flux coil and exterior-limiter coil. To account for the plasma kinetic

Translation studies on an annular field reversed configuration device for space propulsion

Abstract : An annular field reversed configuration is a plasma toroid formed in the annular region between two coaxial coils. The coils induce a toroidal (azimuthal) diamagnetic current in the

Hybrid MHD Model for a Driven, Ion-Current FRC

A standard magnetohydrodynamic code, MACH2 [1], is modified in 1-D to account for two-fluid behavior, to include the effects of a finite-electric field during the formation of a driven,

PPPS-2013: Ion-current FRC using a modified MHD model

Summary form only given. In the standard MHD formulation the effects of finite gyroradius and gyroperiod are usually absent. To include these effects we have modified MACH2, a 2D MHD code, and then

Two-chord interferometry using 3.39 μm He-Ne laser on a flux-coil-generated FRC.

The time evolution of the line-averaged density agrees with the density estimated from the in situ internal magnetic probes, based on a rigid-rotor profile model, as the FRC expands radially.

Hybrid MHD model for a driven, ion-current FRC

Typical MHD models do not include the effects of a finite-electric field, finite gyro-radius, and gyro-period. The magnetohydrodynamic code, MACH2, is modified in one dimension to account for

Rigid-rotor, field-reversed configuration

The radial profiles, n(r), Bz(r), and Er(r), for a Flux-Coil (“inductively driven”), Field-Reversed Configuration (FC-FRC) are measured and compared to the predictions of the Rigid-Rotor Model (RRM),

Limiter-Coil Current Controller for Flux-Coil Generated FRC

This paper describes the Limiter-Coil Current Controller for the Flux-Coil Generated Field-Reversed Configuration plasma confinement device. It provides independent current regulation for each pair



Measurements of Ion Angular Velocity of Field Reversed Configuration with Suppressed Rotational Instability

The angular velocity Ωc of the impurity ions (CV) is measured spectroscopically for the FRC (Field-Reversed-Configuration) plasmas confined in the θ-pinch region and translated into the confinement

Time-of-flight neutral particle analyzer and calibration.

A time-of-flight diagnostic has been implemented on the Irvine field reversed configuration (IFRC) to obtain an energy distribution function from charge-exchanged neutral hydrogen. The diagnostic

Field-reversed configurations with a component of energetic particles

This review is concerned with the physics of field-reversed configurations created by energetic particles of large orbits, of which the earliest example is the Astron. The Astron concept has evolved

Turbulent transport in magnetic confinement: how to avoid it

From recent tokamak research, there is considerable experimental evidence that superthermal ions slow down and diffuse classically in the presence of turbulent fluctuations that cause anomalous

Spectroscopic Flow and Ion Temperature Studies of a Large s FRC

The Swarthmore Spheromak Experiment (SSX) produces a large s FRC by merging counter-helicity spheromaks within a cylindrical flux conserver. Past results have shown that the toroidal fields in each

Review of the Los Alamos FRX-C Experiment

The FRX-C device is a large field-reversed theta pinch experiment with linear dimensions twice those of its FRX-A and FRX-B predecessors. It is used to form field-reversed configurations (FRCs),

Introduction to Plasma Physics

Definition of a plasma. Single-particle motion: Uniform fields. Static, non-uniform fields. Tune-dependent fields. Mappings. Plasmas as fluids: Fluid equations for a plasma. Relation between fluid

Field reversed configurations

The review is devoted to field reversed configurations and to the related field reversed mirrors; both are compact toroids with little or no toroidal magnetic field. Experimental and theoretical

Initial results from the Coaxial Slow Source FRC device

The Coaxial Slow Source (CSS) is a device in which ‘annular’ FRCs, i.e. small aspect ratio, highly elongated plasmas with poloidal fields only, are formed in the annular space between concentric

Spontaneous and artificial generation of sheared-flow in oblate FRCs in TS-3 and 4 FRC Experiments

Spontaneous formation of toroidal flow was measured for the first time in oblate field-reversed configurations (FRCs) produced in TS-3 and TS-4 experiments. The toroidal ion flow (Vi ≈ 10 km s−1) was