Advanced Diagnostics for the Wavenumber Spectrum of Density and Magnetic Field Fluctuations in the C-2U and C-2W Field-Reversed Configurations

October 2018 | L. Schmitz | APS-DPP | Poster

An advanced multi-channel combined Doppler Back-scattering (DBS)/Cross-Polarization (CPS)[1] diagnostic for the C-2W Field-Reversed Configuration (FRC) will be discussed

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Combination Doppler Backscattering / Cross-Polarization Scattering Diagnostic for the C-2W Field-Reversed Configuration

April 2018 | L. Schmitz | HTPD2018 | Poster

A versatile combination Doppler Backscattering (DBS) and Cross-Polarization Scattering (CPS) diagnostic for the C-2W Beam- Driven Field-Reversed Configuration is described.

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Separatrix E×B Shear Flows and Turbulence Propagation in the C-2U FRC; Diagnostic Upgrades for Density and Magnetic Field Fluctuation Measurements in C-2W

October 2017 | L. Schmitz | APS-DPP | Poster

Ion-scale modes have been shown to be stable in the C-2/C-2FRC core, in agreement with initial gyrokinetic simulation results, with a characteristic inverted toroidal wavenumber spectrum confirmed via Doppler Backscattering (DBS) measurements.

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Suppressed ion-scale turbulence in a hot high-beta plasma

December 2016 | L. Schmitz | Nature Communications | Paper

An economic magnetic fusion reactor favours a high ratio of plasma kinetic pressure to magnetic pressure in a well-confined, hot plasma with low thermal losses across the confining magnetic field.

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Control of ion gyroscale fluctuations via electrostatic biasing and sheared E×B flow in the C-2 field reversed configuration

March 2016 | L. Schmitz | AIP Conference Proceedings | Paper

Control of radial particle and thermal transport is instrumental for achieving and sustaining well-confined high-β plasma in a Field-Reversed Configuration (FRC). Radial profiles of low frequency ion gyro-scale density fluctuations (0.5 ≤ kρs ≤ 40), consistent with drift- or drift-interchange modes, have been measured in the scrape-off layer (SOL) and core of the C-2 Field-Reversed Configuration (FRC), together with the toroidal ExB velocity.

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Multi-channel Doppler backscattering measurements in the C-2 field reversed configuration

Multi-channel Doppler backscattering measurements in the C-2 field reversed configuration

August 2014 | L. Schmitz | Review of Scientific Instruments | Paper

A versatile heterodyne Doppler Backscattering (DBS) system is used to measure density fluctuation levels (in the wavenumber range kρs ≤ 50), and the toroidal E × B flow velocity in the C-2 Field-Reversed Configuration (FRC).

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