Advances in Langmuir probe diagnostics of the plasma potential and electron-energy distribution function in magnetized plasma

0460296 - ÚFP 2017 RIV GB eng J - Článek v odborném periodiku
Popov, Tsv.K. - Dimitrova, Miglena - Ivanova, P. - Kovačič, J. - Gyergyek, T. - Dejarnac, Renaud - Stöckel, Jan - Pedrosa, M.A. - López-Bruna, D. - Hidalgo, C.
Advances in Langmuir probe diagnostics of the plasma potential and electron-energy distribution function in magnetized plasma.
Plasma Sources Science & Technology. Roč. 25, č. 3 (2016), č. článku 033001. ISSN 0963-0252. E-ISSN 1361-6595
Grant CEP: GA ČR(CZ) GAP205/12/2327; GA MŠMT(CZ) LM2011021
GRANT EU: European Commission(XE) 633053 - EUROfusion
Institucionální podpora: RVO:61389021
Klíčová slova: COMPASS tokamak * Langmuir probes * magnetized plasma * second-derivative probe techniques * first-derivative probe techniques * plasma potential * EEDF
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
Impakt faktor: 3.302, rok: 2016
http://iopscience.iop.org/article/10.1088/0963-0252/25/3/033001/meta

Advanced Langmuir probe techniques for evaluating the plasma potential and electron-energy distribution function (EEDF) in magnetized plasma are reviewed. It is shown that when the magnetic field applied is very weak and the electrons reach the probe without collisions in the probe sheath the second-derivative Druyvesteyn formula can be used for EEDF evaluation. At low values of the magnetic field, an extended second-derivative Druyvesteyn formula yields reliable results, while at higher values of the magnetic field, the first-derivative probe technique is applicable for precise evaluation of the plasma potential and the EEDF. There is an interval of intermediate values of the magnetic field when both techniques—the extended second-derivative and the first-derivative one—can be used. Experimental results from probe measurements in different ranges of magnetic field are reviewed and discussed: low-pressure argon gas discharges from 0.01 to 0.08 T, probe measurements in circular hydrogen plasmas for high-temperature fusion (magnetic fields from 0.45 T to 1.3 T) in small ISTTOK and CASTOR tokamaks, D-shape COMPASS tokamak plasmas and TJ-II stellarator.
Trvalý link: http://hdl.handle.net/11104/0260414