First simultaneous measurements of Reynolds stress with ball-pen and Langmuir probes

0476139 - ÚFP 2018 RIV US eng J - Journal Article
Grover, Ondřej - Adámek, Jiří - Seidl, Jakub - Devitre, A. - Šos, Miroslav - Vondráček, Petr - Bílková, Petra - Hron, Martin
First simultaneous measurements of Reynolds stress with ball-pen and Langmuir probes.
Review of Scientific Instruments. Roč. 88, č. 6 (2017), č. článku 063501. ISSN 0034-6748. E-ISSN 1089-7623
R&D Projects: GA ČR(CZ) GA15-10723S; GA ČR(CZ) GA16-25074S; GA MŠMT(CZ) LM2015045
Institutional support: RVO:61389021
Keywords : COMPASS tokamak * Electric field effects * Electric fields * Langmuir probes * Magnetoplasma * Ball-pen probes
OECD category: 2.11 Other engineering and technologies
Impact factor: 1.428, year: 2017
http://aip.scitation.org/doi/full/10.1063/1.4984240

A new multi-pin probe head was installed and tested at the COMPASS tokamak. The probe head consists of several ball-pen and Langmuir probes in similar geometric configurations, which enables fast, simultaneous measurements of the radial and poloidal electric field components from differences of plasma or floating potentials using appropriately positioned ball-pen or Langmuir probes, respectively. The fast measurements of the radial electric field are compared with other methods
of measuring selected frequency components of the radial electric field. The radial profiles of the Reynolds stress calculated from correlations of electric field fluctuations obtained by either probe type are compared along with their spectral composition. Lower Reynolds stress values are found for Langmuir probes in comparison to ball-pen probes due to negative contributions from higher frequency fluctuations possibly associated with electron temperature fluctuations.
Permanent Link: http://hdl.handle.net/11104/0272671