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12th International Conference on Ion Sources - ICIS 2007, Jeju : Corée, République De (2007)
The influence of ambipolarity on plasma confinement and the performace of ECRIS
L. Schachter, S. Dobrescu, K.E. Stiebing, T. Thuillier1, T. Lamy1

Charge diffusion in an ECRIS discharge is usually characterized by non ambipolar behavior. While the ions are transported to the radial walls, electrons are lost axially from the magnetic trap. Global neutrality is maintained via compensating currents in the conducting walls of the vacuum chamber. It is assumed that this behavior reduces the ion breeding times compared to a truly ambipolar plasma. We have carried out a series of dedicated experiments in which the ambipolarity of the ECRIS plasma was influenced by inserting special metal-dielectric structures (MD layers) into the plasma chamber of the Frankfurt 14GHz ECRIS. The measurements demonstrate the positive influence on the source performance when the ECR plasma is changed towards more ambipolar behavior.
1 :  LPSC - Laboratoire de Physique Subatomique et de Cosmologie
Physique/Physique/Instrumentations et Détecteurs

Physique/Physique/Physique des plasmas
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ICIS2007-thierry-04.pdf(174 KB)