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Putignano O, Perelli Cippo E, Rebai M, Grosso G, Nocente M, Pillon M, Ayllon-Guerola J, Garcia-Muñoz M. Characterization of the response of Fast Ion Loss Detectors to fusion neutrons for applications at JT-60SA and ITER. FUSION ENGINEERING AND DESIGN 2021. [DOI: 10.1016/j.fusengdes.2021.112913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Gonzalez-Martin J, Garcia-Munoz M, Sieglin B, Herrmann A, Lunt T, Ayllon-Guerola J, Galdon-Quiroga J, Hidalgo-Salaverri J, Kovacsik A, Rivero-Rodriguez JF, Sanchis L, Silvagni D, Zoletnik S, Dominguez J. Self-adaptive diagnostic of radial fast-ion loss measurements on the ASDEX Upgrade tokamak (invited). THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:053538. [PMID: 34243326 DOI: 10.1063/5.0043756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 04/28/2021] [Indexed: 06/13/2023]
Abstract
A poloidal array of scintillator-based Fast-Ion Loss Detectors (FILDs) has been installed in the ASDEX Upgrade (AUG) tokamak. While all AUG FILD systems are mounted on reciprocating arms driven externally by servomotors, the reciprocating system of the FILD probe located just below the midplane is based on a magnetic coil that is energized in real-time by the AUG discharge control system. This novel reciprocating system allows, for the first time, real-time control of the FILD position including infrared measurements of its probe head temperature to avoid overheating. This considerably expands the diagnostic operational window, enabling unprecedented radial measurements of fast-ion losses. Fast collimator-slit sweeping (up to 0.2 mm/ms) is used to obtain radially resolved velocity-space measurements along 8 cm within the scrape-off layer. This provides a direct evaluation of the neutral beam deposition profiles via first-orbit losses. Moreover, the light-ion beam probe (LIBP) technique is used to infer radial profiles of fast-ion orbit deflection. This radial-LIBP technique is applied to trapped orbits (exploring both the plasma core and the FILD stroke near the wall), enabling radial localization of internal plasma fluctuations (neoclassical tearing modes). This is quantitatively compared against electron cyclotron emission measurements, showing excellent agreement. For the first time, radial profiles of fast-ion losses in MHD quiescent plasmas as well as in the presence of magnetic islands and edge localized modes are presented.
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Affiliation(s)
- J Gonzalez-Martin
- Department of Mechanical Engineering and Manufacturing, Universidad de Sevilla, 41092 Sevilla, Spain
| | - M Garcia-Munoz
- Centro Nacional de Aceleradores (CNA), 41092 Sevilla, Spain
| | - B Sieglin
- Max Planck Institute for Plasma Physics, 85748 Garching, Germany
| | - A Herrmann
- Max Planck Institute for Plasma Physics, 85748 Garching, Germany
| | - T Lunt
- Max Planck Institute for Plasma Physics, 85748 Garching, Germany
| | - J Ayllon-Guerola
- Department of Mechanical Engineering and Manufacturing, Universidad de Sevilla, 41092 Sevilla, Spain
| | - J Galdon-Quiroga
- Department of Atomic, Molecular and Nuclear Physics, Universidad de Sevilla, 41012 Sevilla, Spain
| | - J Hidalgo-Salaverri
- Department of Mechanical Engineering and Manufacturing, Universidad de Sevilla, 41092 Sevilla, Spain
| | - A Kovacsik
- Budapest University of Technology and Economics, 1111 Budapest, Hungary
| | - J F Rivero-Rodriguez
- Department of Mechanical Engineering and Manufacturing, Universidad de Sevilla, 41092 Sevilla, Spain
| | - L Sanchis
- Department of Applied Physics, Aalto University, FI-00076 Aalto, Finland
| | - D Silvagni
- Max Planck Institute for Plasma Physics, 85748 Garching, Germany
| | | | - J Dominguez
- Department of Mechanical Engineering and Manufacturing, Universidad de Sevilla, 41092 Sevilla, Spain
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Shinohara K, Kim J, Kim JY, Rhee T. Evaluation of observable phase space by fast ion loss detector by calculating particle orbits in consideration of plasma facing components and three dimensional magnetic field. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:11D804. [PMID: 27910607 DOI: 10.1063/1.4959877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The orbits of lost ions can be calculated from the information obtained by a fast ion loss detector (FILD). The orbits suggest a source of the lost fast ions in a phase space. However, it is not obvious whether an observable set of orbits, or phase space, of a FILD appropriately covers the region of interest to be investigated since the observable phase space can be affected by plasma facing components (PFCs) and a magnetic configuration. A tool has been developed to evaluate the observable phase space of FILD diagnostic by calculating particle orbits by taking the PFCs and 3D magnetic field into account.
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Affiliation(s)
- Kouji Shinohara
- National Institutes for Quantum and Radiological Science and Technology, Naka, Ibaraki 311-0193, Japan
| | - Junghee Kim
- National Fusion Research Institute, Daejeon, South Korea
| | - Jun Young Kim
- Korea University of Science and Technology, Daejeon, South Korea
| | - Tongnyeol Rhee
- National Fusion Research Institute, Daejeon, South Korea
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