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Grenfell G, Adamek J, Komm M, Brida D, Conway GD, Manz P, Tolias P, Eich T, Sestak D, Herrmann A, Nishizawa T, Stroth U. High-heat flux ball-pen probe head in ASDEX-Upgrade. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:023507. [PMID: 35232131 DOI: 10.1063/5.0075846] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 01/18/2022] [Indexed: 06/14/2023]
Abstract
A new high heat flux ball-pen probe head installed on the midplane manipulator is currently being used in ASDEX-Upgrade (AUG). The probe was designed to withstand high heat fluxes making possible the investigation of the plasma edge under harsh conditions, such as low power H-mode. Composed of seven pins (four Langmuir probes, mounted in two Mach probe pairs, and three ball-pen probes), the new probe head allows us to measure several plasma parameters simultaneously and with high temporal resolution. A novel method to correct the sheath potential dynamically accounting for the total secondary electron emission is introduced together with applications to obtain the electron temperature and plasma potential profiles. The total secondary electron emission yield is obtained from particle in cell simulations in AUG condition and probe realistic impact angle with respect to the magnetic field. Finally, the probe capability to investigate turbulence around the separatrix of AUG is discussed.
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Affiliation(s)
- G Grenfell
- Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, Garching, Germany
| | - J Adamek
- Institute of Plasma Physics of the CAS, Za Slovankou 3, 182 00 Prague 8, Czech Republic
| | - M Komm
- Institute of Plasma Physics of the CAS, Za Slovankou 3, 182 00 Prague 8, Czech Republic
| | - D Brida
- Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, Garching, Germany
| | - G D Conway
- Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, Garching, Germany
| | - P Manz
- Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, Garching, Germany
| | - P Tolias
- Division of Space and Plasma Physics, Association EUROfusion-VR, Royal Institute of Technology KTH, Teknikringen 31, 100 44 Stockholm, Sweden
| | - T Eich
- Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, Garching, Germany
| | - D Sestak
- Institute of Plasma Physics of the CAS, Za Slovankou 3, 182 00 Prague 8, Czech Republic
| | - A Herrmann
- Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, Garching, Germany
| | - T Nishizawa
- Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, Garching, Germany
| | - U Stroth
- Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, Garching, Germany
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Dejarnac R, Horacek J, Hron M, Jerab M, Adamek J, Atikukke S, Barton P, Cavalier J, Cecrdle J, Dimitrova M, Gauthier E, Iafrati M, Imrisek M, Marin Roldan A, Mazzitelli G, Naydenkova D, Prishvitcyn A, Tomes M, Tskhakaya D, Van Oost G, Varju J, Veis P, Vertkov A, Vondracek P, Weinzettl V. Overview of power exhaust experiments in the COMPASS divertor with liquid metals. NUCLEAR MATERIALS AND ENERGY 2020. [DOI: 10.1016/j.nme.2020.100801] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Weinzettl V, Matejicek J, Ratynskaia S, Tolias P, De Angeli M, Riva G, Dimitrova M, Havlicek J, Adamek J, Seidl J, Tomes M, Cavalier J, Imrisek M, Havranek A, Panek R, Peterka M. Dust remobilization experiments on the COMPASS tokamak. FUSION ENGINEERING AND DESIGN 2017. [DOI: 10.1016/j.fusengdes.2017.01.044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Grover O, Adamek J, Seidl J, Devitre A, Sos M, Vondracek P, Bilkova P, Hron M. First simultaneous measurements of Reynolds stress with ball-pen and Langmuir probes. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2017; 88:063501. [PMID: 28668002 DOI: 10.1063/1.4984240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
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.
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Affiliation(s)
- Ondrej Grover
- Faculty of Nuclear Physics, Czech Technical University in Prague, Prague 115 19, Czech Republic
| | - Jiri Adamek
- Institute of Plasma Physics, The Czech Academy of Sciences, Prague 182 00, Czech Republic
| | - Jakub Seidl
- Institute of Plasma Physics, The Czech Academy of Sciences, Prague 182 00, Czech Republic
| | - Alexis Devitre
- Institute of Plasma Physics, The Czech Academy of Sciences, Prague 182 00, Czech Republic
| | - Miroslav Sos
- Institute of Plasma Physics, The Czech Academy of Sciences, Prague 182 00, Czech Republic
| | - Petr Vondracek
- Institute of Plasma Physics, The Czech Academy of Sciences, Prague 182 00, Czech Republic
| | - Petra Bilkova
- Institute of Plasma Physics, The Czech Academy of Sciences, Prague 182 00, Czech Republic
| | - Martin Hron
- Institute of Plasma Physics, The Czech Academy of Sciences, Prague 182 00, Czech Republic
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