Direct measurements of the plasma potential by katsumata-type probes

0050420 - ÚFP 2007 RIV CZ eng J - Journal Article
Schrittwieser, R. - Ionita, C. - Adámek, Jiří - Stöckel, Jan - Brotánková, Jana - Martines, E. - Popa, G. - Costin, C. - van de Peppel, L. - Van Oost, G.
Direct measurements of the plasma potential by katsumata-type probes.
[Přímé měření potenciálu plazmatu sondami typu Katsumata.]
Czechoslovak Journal of Physics. Roč. 56, 8 suppl.B (2006), s. 145-150. ISSN 0011-4626.
[Symposium on Plasma Physics and Technology /22nd./. Praha, 26.6.2006-29.6.2006]
R&D Projects: GA AV ČR(CZ) KJB100430601
Institutional research plan: CEZ:AV0Z20430508
Keywords : toroidal plasma system * tokamak * probe diagnostics * plasma potential
Subject RIV: BL - Plasma and Gas Discharge Physics
Impact factor: 0.568, year: 2006

By taking advantage of the inherent difference between the gyro-radii of ions and electrons in a magnetised plasma, we developed a method to measure the plasma potential directly. The principle is based on the concept of the Katsumata probe. The probe collector is hidden inside a tube which screens an adjustable fraction of the electron flux whereas it lets pass most of the ions. In this paper an arrangement of three Katsumata-type probes with different diameters is used in the edge plasma region of the CASTOR tokamak to investigate the influence of the dimension of the probe. The results show almost no influence of the probe diameter on the values of the plasma potential.

By taking advantage of the inherent difference between the gyro-radii of ions and electrons in a magnetised plasma, we developed a method to measure the plasma potential directly. The principle is based on the concept of the Katsumata probe. The probe collector is hidden inside a tube which screens an adjustable fraction of the electron flux whereas it lets pass most of the ions. In this paper an arrangement of three Katsumata-type probes with different diameters is used in the edge plasma region of the CASTOR tokamak to investigate the influence of the dimension of the probe. The results show almost no influence of the probe diameter on the values of the plasma potential.
Permanent Link: http://hdl.handle.net/11104/0003817