ScholarLens Back to search
1989•AIP conference proceedingsRequires access

Analysis of charge exchange measurments during ICRF and ICRF+NBI heating in TFTR

Gregory W. Hammett, W. Dorland, R. Kaita, S. S. Medley, David N Smithe, Patrick L. Colestock

Open publisher page 1 citations

Abstract

Charge‐exchange measurements during ICRF‐only and combined ICRF (2MW) and NBI (7 MW) heating have been made with vertically‐viewing mass‐resolving analyzers. We have observed an enhancement of the deuterium spectrum above the beam injection energy, providing evidence of second harmonic acceleration of beam ions by the ICRF waves. The measured spectra are in resonable agreement with the predictions of a comprehensive ICRF+NBI code, given the measurement error bars and the simulation uncertainties due to the hydrogen concentration, RF power profile, and effects of sawteeth. In the ICRF‐only case, we present measurements from a toroidal field scan which show that the flux of 150 keV H‐minority ions varies by a factor of 7 and is largest when the resonance layer is over the detector sightline. Future experiments are proposed to extend the results obtained here.

About this research paper

What this paper is about

Charge‐exchange measurements during ICRF‐only and combined ICRF (2MW) and NBI (7 MW) heating have been made with vertically‐viewing mass‐resolving analyzers. We have observed an enhancement of the deuterium spectrum above the beam injection energy, providing evidence of second harmonic acceleration of beam ions by the ICRF waves. The measured spectra are in resonable agreement with the predictions of a comprehensive ICRF+NBI code, given the measurement error bars and the simulation uncertainties due to the hydrogen concentration, RF power profile, and effects of sawteeth. In the ICRF‐only case, we present measurements from a toroidal field scan which show that the flux of 150 keV H‐minority ions varies by a factor of 7 and is largest when the resonance layer is over the detector sightline. Future experiments are proposed to extend the results obtained here.

Why it matters

OpenAlex reports 1 citations for this work. Citation counts describe recorded attention and do not establish research quality.

Key contribution

A contribution statement is not available in the OpenAlex record.

Method / approach

Method details are not available in the OpenAlex metadata.

Main findings

Findings are not separately available in the OpenAlex metadata.

Limitations

Limitations are not available in the OpenAlex metadata.

Applications

Application details are not available in the OpenAlex metadata.

Available abstract

Charge‐exchange measurements during ICRF‐only and combined ICRF (2MW) and NBI (7 MW) heating have been made with vertically‐viewing mass‐resolving analyzers. We have observed an enhancement of the deuterium spectrum above the beam injection energy, providing evidence of second harmonic acceleration of beam ions by the ICRF waves. The measured spectra are in resonable agreement with the predictions of a comprehensive ICRF+NBI code, given the measurement error bars and the simulation uncertainties due to the hydrogen concentration, RF power profile, and effects of sawteeth. In the ICRF‐only case, we present measurements from a toroidal field scan which show that the flux of 150 keV H‐minority ions varies by a factor of 7 and is largest when the resonance layer is over the detector sightline. Future experiments are proposed to extend the results obtained here.

Key concepts: Charge exchange, Beam (structure), Acceleration, Atomic physics, Physics, Ion, Plasma, Deuterium

Related papers

Related paper 1Related paper 2Related paper 3
Back to paper searchBrowse research topicsOriginal source
Analysis of charge exchange measurments during ICRF and ICRF+NBI heating in TFTR — Research Paper | ScholarLens