Tunnel probes for measurements of the electron and ion temperature in fusion plasmas

0355685 - ÚFP 2011 RIV US eng J - Článek v odborném periodiku
Gunn, J. P. - Schrittwieser, R. - Balan, P. - Ionita, C. - Stöckel, Jan - Adámek, Jiří - Ďuran, Ivan - Hron, Martin - Pánek, Radomír - Bařina, O. - Hrach, R. - Vicher, M. - Van Oost, G. - Van Rompuy, T. - Martines, E.
Tunnel probes for measurements of the electron and ion temperature in fusion plasmas.
Review of Scientific Instruments. Roč. 75, č. 10 (2004), s. 4328-4330. ISSN 0034-6748. E-ISSN 1089-7623.
[Topical Conference on High-Temperature Plasma Diagnostics/15th./. San Diego, 19.04.2004-22.04.2004]
Grant CEP: GA ČR GA202/03/0786
Výzkumný záměr: CEZ:AV0Z2043910
Klíčová slova: Tokamak * electron temperature * ion temperature * plasma diagnostics
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 1.226, rok: 2004

We have developed tunnel probes for localized measurements of the electron and ion temperature in the edge plasma region of smaller tokamaks and stellarators. A normal tunnel probe for Te measurements consists of a metallic tunnel of 5 mm diameter and 5 mm length, with the axis parallel to the magnetic field. One side is open, the other side is closed by a metallic backplate, isolated from the tunnel. If both electrodes are biased negatively, ions flow into the office, and their current is distributed between the tunnel and the backplate. The ratio of the two ion currents is a function of Te. With an additional diaphragm in front of the orifice, the probe becomes ion sensitive, since the electrons are prevented from the tunnel because of their smaller gyroradius, but ions can still reach it. In this way, the perpendicular ion temperature can be derived. By segmenting the tunnel axially into two parts, also an approximate measure for the parallel ion temperature can be found.
Trvalý link: http://hdl.handle.net/11104/0194398