TORE SUPRA Association EURATOM-CEA Département de Recherches sur la Fusion Contrôlée CEA - CADARACHE 13108 Saint-Paul-lez-Durance FRANCE Nonlinear LH Wave.

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TORE SUPRA Association EURATOM-CEA Département de Recherches sur la Fusion Contrôlée CEA - CADARACHE Saint-Paul-lez-Durance FRANCE Nonlinear LH Wave Effects in Front of LH Grills December 16-17, 2004Jamie Gunn 1 RFA measurements of the “Fast Particles” in Tore Supra J. P. Gunn, a M. Goniche, a V. Petrzilka b a Association EURATOM-CEA sur la fusion contrôlée, Saint Paul Lez Durance, France b Institute of Plasma Physics, Association EURATOM-IPP.CR, Prague, Czech Republic

TORE SUPRA Association EURATOM-CEA Département de Recherches sur la Fusion Contrôlée CEA - CADARACHE Saint-Paul-lez-Durance FRANCE Nonlinear LH Wave Effects in Front of LH Grills December 16-17, 2004Jamie Gunn 2 title

TORE SUPRA Association EURATOM-CEA Département de Recherches sur la Fusion Contrôlée CEA - CADARACHE Saint-Paul-lez-Durance FRANCE Nonlinear LH Wave Effects in Front of LH Grills December 16-17, 2004Jamie Gunn 3 Grid 1 : variable positive voltage to reject low energy ions; BUT in our experiment the voltage was zero : all ions go to collector Grid 2 (-200 V) : negative voltage to repel secondary electrons Collector (grounded): pure ion current characteristic (analysis gives T i ) entrance slit (-50 V) : negative voltage to repel thermal electrons

TORE SUPRA Association EURATOM-CEA Département de Recherches sur la Fusion Contrôlée CEA - CADARACHE Saint-Paul-lez-Durance FRANCE Nonlinear LH Wave Effects in Front of LH Grills December 16-17, 2004Jamie Gunn 4 No thermal electrons pass through the entrance slit in the ohmic regime This is verified by sweeping the voltage of the entrance slit from +10 V down to -50 V. The ion current saturates already at -10 V. The RFA collector therefore measures pure ion current.

TORE SUPRA Association EURATOM-CEA Département de Recherches sur la Fusion Contrôlée CEA - CADARACHE Saint-Paul-lez-Durance FRANCE Nonlinear LH Wave Effects in Front of LH Grills December 16-17, 2004Jamie Gunn 5 Temporal evolution of ion currents during a probe reciprocation Ohmic regime; only data at U SLIT =-50 V are shown.

TORE SUPRA Association EURATOM-CEA Département de Recherches sur la Fusion Contrôlée CEA - CADARACHE Saint-Paul-lez-Durance FRANCE Nonlinear LH Wave Effects in Front of LH Grills December 16-17, 2004Jamie Gunn 6 Radial profiles of ion currents in ohmic regime

TORE SUPRA Association EURATOM-CEA Département de Recherches sur la Fusion Contrôlée CEA - CADARACHE Saint-Paul-lez-Durance FRANCE Nonlinear LH Wave Effects in Front of LH Grills December 16-17, 2004Jamie Gunn 7 When antenna C2 is active (1.5 MW) negative current is observed on both the entrance slit and the collector. Negative current means that : (1) the electron flux exceeds the ion flux (2) the applied potentials are not negative enough to repel the electrons The negative current is observed at the same position on the inward and outward parts of the probe reciprocation.

TORE SUPRA Association EURATOM-CEA Département de Recherches sur la Fusion Contrôlée CEA - CADARACHE Saint-Paul-lez-Durance FRANCE Nonlinear LH Wave Effects in Front of LH Grills December 16-17, 2004Jamie Gunn 8 The electron flux is localized in a layer ~1 cm thick. The outer edge of the electron layer coincides with the leading edge of the LH antennae within the uncertainty of the magnetic measurements (at most ±5 mm).

TORE SUPRA Association EURATOM-CEA Département de Recherches sur la Fusion Contrôlée CEA - CADARACHE Saint-Paul-lez-Durance FRANCE Nonlinear LH Wave Effects in Front of LH Grills December 16-17, 2004Jamie Gunn 9 The electron current on the entrance slit and on the collector comes in rapid bursts (typical frequency in the kHz range). Here we have subtracted the ion saturation currents from the signals to extract the pure electron component.

TORE SUPRA Association EURATOM-CEA Département de Recherches sur la Fusion Contrôlée CEA - CADARACHE Saint-Paul-lez-Durance FRANCE Nonlinear LH Wave Effects in Front of LH Grills December 16-17, 2004Jamie Gunn 10 The transmission factor is defined as the ratio of the electron current densities to the entrance slit and collector. Here we show the transmission factor of the largest bursts. The transmission is higher in the center of the beam. Electrons that reach the collector have at least 150 eV of kinetic energy as they pass through the entrance slit. The variation of transmission factor could be qualitatively indicative of the width of the electron distribution function.