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Conceptual design of beam-ion profile diagnostics for the DIII-D tokamak

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3 Author(s)
Heidbrink, W.W. ; University of California, 4129 Frederick Reines Hall, Irvine, California 92697-4575 ; Cross, W.D. ; Krasilnikov, A.V.

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Three diagnostic concepts that measure the radial profile of deuterium beam ions are assessed. One diagnostic exploits 3 MeV protons that are lost on their first orbit. Since beam-plasma reactions usually predominate in the discharges of interest, the beam-ion density profile can be inferred from the d-d fusion reaction profile. The relatively modest plasma current (∼1.6 MA) implies that a significant fraction of the charged d-d fusion reaction products are unconfined. The second diagnostic employs a neutron collimator. For this diagnostic, neutron scattering is a major concern. Both fusion product diagnostics are sensitive to uncertainties in the thermonuclear rate, so the anomalous beam-ion transport must exceed DB≳1.0 m2/s to be detectable. The third diagnostic employs an array of natural diamond detectors that is configured to measure the signal from beam ions that charge exchange with neutrals in a modulated heating beam. The sensitivity to uncertainties caused by pitch-angle scattering of the beam ions can be minimized by a prudent choice of detection angle. Because of attenuation of the escaping neutrals the effective resolution is DB∼0.5 m2/s. © 2003 American Institute of Physics.

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Review of Scientific Instruments  (Volume:74 ,  Issue: 3 )