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Harrer GF, Faitsch M, Radovanovic L, Wolfrum E, Albert C, Cathey A, Cavedon M, Dunne M, Eich T, Fischer R, Griener M, Hoelzl M, Labit B, Meyer H, Aumayr F. Quasicontinuous Exhaust Scenario for a Fusion Reactor: The Renaissance of Small Edge Localized Modes. PHYSICAL REVIEW LETTERS 2022; 129:165001. [PMID: 36306746 DOI: 10.1103/physrevlett.129.165001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Revised: 07/08/2022] [Accepted: 08/08/2022] [Indexed: 06/16/2023]
Abstract
Tokamak operational regimes with small edge localized modes (ELMs) could be a solution to the problem of large transient heat loads in fusion reactors. A ballooning mode near the last closed flux surface governed by the pressure gradient and the magnetic shear there has been proposed for small ELMs. In this Letter, we experimentally investigate several stabilizing effects near the last closed flux surface and present linear ideal simulations that indeed develop ballooninglike fluctuations there and connect them with nonlinear resistive simulations. The dimensionless parameters of the small ELM regime in the region of interest are very similar to those in a reactor, making this regime the ideal exhaust scenario for a future device.
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Affiliation(s)
- G F Harrer
- Institute of Applied Physics, TU Wien, Fusion@ÖAW, Vienna, Austria
- Max Planck Institute for Plasma Physics, Garching, Germany
| | - M Faitsch
- Max Planck Institute for Plasma Physics, Garching, Germany
| | - L Radovanovic
- Institute of Applied Physics, TU Wien, Fusion@ÖAW, Vienna, Austria
- Max Planck Institute for Plasma Physics, Garching, Germany
| | - E Wolfrum
- Max Planck Institute for Plasma Physics, Garching, Germany
| | - C Albert
- Institute of Theoretical and Computational Physics, TU Graz, Graz, Austria
| | - A Cathey
- Max Planck Institute for Plasma Physics, Garching, Germany
| | - M Cavedon
- Dipartimento di Fisica "G. Occhialini," Università di Milano-Bicocca, Milano, Italy
| | - M Dunne
- Max Planck Institute for Plasma Physics, Garching, Germany
| | - T Eich
- Max Planck Institute for Plasma Physics, Garching, Germany
| | - R Fischer
- Max Planck Institute for Plasma Physics, Garching, Germany
| | - M Griener
- Max Planck Institute for Plasma Physics, Garching, Germany
| | - M Hoelzl
- Max Planck Institute for Plasma Physics, Garching, Germany
| | - B Labit
- École Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), CH-1015 Lausanne, Switzerland
| | - H Meyer
- CCFE, Culham Science Centre, Abingdon, Oxon, United Kingdom
| | - F Aumayr
- Institute of Applied Physics, TU Wien, Fusion@ÖAW, Vienna, Austria
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Fischer R, Giannone L, Illerhaus J, McCarthy PJ, McDermott RM, ASDEX Upgrade Team. Estimation and Uncertainties of Profiles and Equilibria for Fusion Modeling Codes. FUSION SCIENCE AND TECHNOLOGY 2020. [DOI: 10.1080/15361055.2020.1820794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- R. Fischer
- Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany
| | - L. Giannone
- Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany
| | - J. Illerhaus
- Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany
- Technische Universität München, Physik-Department E28, 85747 Garching, Germany
| | - P. J. McCarthy
- University College Cork, Department of Physics, Cork, Ireland
| | - R. M. McDermott
- Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany
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Garcia-Martinez P, Montes P. An efficient MHD equilibrium solver for control oriented transport models. FUSION ENGINEERING AND DESIGN 2020. [DOI: 10.1016/j.fusengdes.2020.111455] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Giannone L, Fischer R, Fuchs JC, Geiger B, Maraschek M, Rittich D, Sieglin B, Bock A, Hobirk J, Kallenbach A, Mertens V, Schuhbeck KH, McCarthy PJ. Note: Internal diamagnetic flux measurements on ASDEX Upgrade. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:106101. [PMID: 30399901 DOI: 10.1063/1.5045543] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Accepted: 09/11/2018] [Indexed: 06/08/2023]
Abstract
Internal diamagnetic flux measurements, with measurement loops and compensation magnetic probes inside the vacuum vessel, are now available on the ASDEX Upgrade tokamak. The measured diamagnetic flux is compared to that predicted by simulations and calculated from equilibrium reconstruction. The diamagnetic flux measured at 2 positions separated toroidally by 180° in the vacuum vessel is compared.
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Affiliation(s)
- L Giannone
- Max Planck Institute for Plasma Physics, 85748 Garching, Germany
| | - R Fischer
- Max Planck Institute for Plasma Physics, 85748 Garching, Germany
| | - J C Fuchs
- Max Planck Institute for Plasma Physics, 85748 Garching, Germany
| | - B Geiger
- Max Planck Institute for Plasma Physics, 85748 Garching, Germany
| | - M Maraschek
- Max Planck Institute for Plasma Physics, 85748 Garching, Germany
| | - D Rittich
- Max Planck Institute for Plasma Physics, 85748 Garching, Germany
| | - B Sieglin
- Max Planck Institute for Plasma Physics, 85748 Garching, Germany
| | - A Bock
- Max Planck Institute for Plasma Physics, 85748 Garching, Germany
| | - J Hobirk
- Max Planck Institute for Plasma Physics, 85748 Garching, Germany
| | - A Kallenbach
- Max Planck Institute for Plasma Physics, 85748 Garching, Germany
| | - V Mertens
- Max Planck Institute for Plasma Physics, 85748 Garching, Germany
| | - K H Schuhbeck
- Max Planck Institute for Plasma Physics, 85748 Garching, Germany
| | - P J McCarthy
- Department of Physics, University College Cork, Cork T12 YN60, Ireland
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Reusch LM, Nornberg MD, Goetz JA, Den Hartog DJ. Using integrated data analysis to extend measurement capability (invited). THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:10K103. [PMID: 30399657 DOI: 10.1063/1.5039349] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 07/12/2018] [Indexed: 06/08/2023]
Abstract
The analysis approach called integrated data analysis (IDA) provides a means to exploit all information present in multiple streams of raw data to produce the best inference of a plasma parameter. This contrasts with the typical approach in which information (data) from a single diagnostic is used to measure a given parameter, e.g., visible bremsstrahlung → Z eff. Data from a given diagnostic usually contain information on many parameters. For example, a Thomson scattering diagnostic is sensitive to bremsstrahlung and line emission in addition to electron temperature. This background light is typically subtracted off and discarded but could be used to improve knowledge of Z eff. IDA encourages explicit awareness of such information and provides the quantitative framework to exploit it. This gives IDA the ability to increase spatial and temporal resolution, increase precision and accuracy of inferences, and measure plasma parameters that are difficult or impossible to measure using single diagnostic techniques. One example is the measurement of Z eff on Madison symmetric torus using IDA since no single diagnostic can provide a robust measurement. As we enter the burning plasma era, application of IDA will be critical to the measurement of certain parameters, as diagnostic access in the harsh fusion environment will be extremely limited.
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Affiliation(s)
- L M Reusch
- University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - M D Nornberg
- University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - J A Goetz
- University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - D J Den Hartog
- University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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