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Author Pinsker, R. I. ♦ Porkolab, M. ♦ Heidbrink, W. W. ♦ Luo, Y. ♦ Petty, C. C. ♦ Prater, R. ♦ Murakami, M.
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Fast Wave Absorption Mechanism ♦ Ex P6-24 Experimental Study ♦ Energetic Ion ♦ Edge Loss ♦ Harmonic Case ♦ Fast Ion ♦ Core Absorption Mechanism ♦ Central Absorption Mechanism ♦ Fida Diagnostic ♦ Strong Acceleration ♦ Injected Deuteron ♦ Fw Power ♦ Strong Absorption ♦ Harmonic Number ♦ Injected Energy ♦ Quantitative Model ♦ Ion Absorption ♦ Confinement Analysis ♦ Fast Wave Absorption ♦ Injected Beam ♦ Fusion Neutron Rate Measurement ♦ Quantitative Modeling ♦ Equilibrium Reconstruction ♦ Experimental Result ♦ Weak Acceleration
Abstract harmonic numbers between 4 and 8. While strong absorption of FWs at the 4th harmonic of injected deuterons has been clearly observed, ion absorption under the same conditions at 6th and 8th harmonics is seen to be weak. Data on fast wave absorption on the injected beam is obtained from confinement analysis and equilibrium reconstruction, from fusion neutron rate measurements, and from fast ion D α (FIDA) spectroscopy. Strong acceleration of the beam above the injected energy in the 4th harmonic case, weak acceleration in some of the 6th harmonic cases, and no acceleration in the 8th harmonic cases is observed with the FIDA diagnostic. The experimental results also indicate clearly the importance of edge losses in cases in which the central absorption mechanisms are weak. Therefore quantitative modeling must take the edge losses into account. Core absorption mechanisms will be much stronger in ITER, so that edge losses should be much less significant than in DIII-D, but the competition between core damping mechanisms will be similar. Hence, establishment of a quantitative model of the partitioning of FW power among competing absorption processes is important in both cases. 1.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study