Edge plasma measurements using emissive probes in ISTTOK

作     者：Balan, P. Ioniţǎ, C. Schrittwieser, R. Silva, C. Figueiredo, H.F.C. Varandas, C.A.F. Rasmussen, J.J. Naulin, V. 

作者机构：IEPPG Institute for Ion Physics University of Innsbruck 6020 Innsbruck Technikerstr. 25 Austria Centro de Fusão Nuclear Association EURATOM/IST Instituto Superior Técnico P-1049-001 Lisboa Av. Rovisco Pais Portugal National Research Center Risø Association EURATOM/Risø Roskilde DK-4000 Frederiksborgvej 399 Denmark 

出 版 物：《AIP Conference Proceedings》 (AIP Conf. Proc.)

年 卷 期：2006年第875卷第1期

页      面：105-110页

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0901[农学-作物学] 0902[农学-园艺学] 0704[理学-天文学] 0833[工学-城乡规划学] 0713[理学-生态学] 0834[工学-风景园林学（可授工学、农学学位）] 0702[理学-物理学] 

摘      要：A probe array consisting of three emissive and one cylindrical probe was developed for edge plasma measurements in ISTTOK. The emissive probes measure the plasma potential, pl, independently of electron drifts or electron temperature fluctuations. The probe array has the advantage of to record the density, the poloidal and radial electric field, and their fluctuations simultaneously. Radial plasma profiles were recorded with and without negative edge biasing with an emissive electrode. The statistical properties of the poloidal electric field and of the turbulent particle flux, measured with cold and emissive probes, were compared. Both the root mean square of the poloidal electric field and the fluctuations-induced particle flux were found to be significantly larger when measured with the emissive probes, indicating that temperature fluctuations are important for the particle flux determination. The flux distribution was also found to be more peaked and asymmetric when measured with the emissive probes. A clear reduction of the turbulent particle flux and an improvement of the plasma confinement are observed during the negative emissive electrode biasing. © 2006 American Institute of Physics.