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182 results on '"The University of Texas at Austin"'

25. Multiscale Chirping Modes Driven by Thermal Ions in a Plasma with Reactor-Relevant Ion Temperature

Author

Xiaodi Du, N. W. Eidietis, M. Knolker, Wen Wu, M. A. Van Zeeland, Yueqiang Liu, T. L. Rhodes, Max E Austin, Huiqian Wang, William Heidbrink, Antti Snicker, Xiang Jian, R. Hong, Neal Crocker, K. Särkimäki, General Atomics, University of California Los Angeles, University of California Irvine, University of California San Diego, University of Texas at Austin, Chalmers University of Technology, Department of Applied Physics, Aalto-yliopisto, and Aalto University

Subjects
Range (particle radiation), Materials science, Tokamak, General Physics and Astronomy, Plasma, Instability, Molecular physics, law.invention, Ion, Physics::Plasma Physics, law, Excited state, Thermal, Microturbulence
Abstract

Funding Information: The author (X. D. Du) would like to thank F. Zonca and L. Chen for fruitful discussions. This work was supported by the US DOE under DE-AC05-00OR22725, DE-FC02-04ER54698, DE-AC02-09CH11466, DE-SC0015878, and DE-SC0018287. Publisher Copyright: © 2021 American Physical Society. A thermal ion driven bursting instability with rapid frequency chirping, considered as an Alfvénic ion temperature gradient mode, has been observed in plasmas having reactor-relevant temperature in the DIII-D tokamak. The modes are excited over a wide spatial range from macroscopic device size to microturbulence size and the perturbation energy propagates across multiple spatial scales. The radial mode structure is able to expand from local to global in ∼0.1 ms and it causes magnetic topology changes in the plasma edge, which can lead to a minor disruption event. Since the mode is typically observed in the high ion temperature ≳10 keV and high-β plasma regime, the manifestation of the mode in future reactors should be studied with development of mitigation strategies, if needed. This is the first observation of destabilization of the Alfvén continuum caused by the compressibility of ions with reactor-relevant ion temperature.

Published
2021

31. 2020 roadmap on plasma accelerators

Author

Michael C. Downer, Marija Vranic, F. Mathieu, Joerg Schreiber, Leonida A. Gizzi, Jérôme Faure, Jean-Luc Vay, Stuart Mangles, Paul Mason, Alessandro Flacco, Andreas Alexander Maier, Patric Muggli, Mamiko Nishiuchi, Marie-Emmanuelle Couprie, Ulrich Schramm, Thomas Grismayer, Axel Huebl, Felicie Albert, Alexander Debus, P. P. Rajeev, Alexander Thomas, Karl Zeil, Marie Labat, Chan Joshi, Wim Leemans, Jens Osterhoff, Lawrence Livermore National Laboratory (LLNL), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Institute of Radiation Physics [Dresden], Helmholtz-Zentrum Dresden-Rossendorf (HZDR), University of Texas at Austin [Austin], Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Istituto Nazionale di Ottica (INO), Consiglio Nazionale delle Ricerche (CNR), Instituto de Plasmas e Fusão Nuclear [Lisboa] (IPFN), Instituto Superior Técnico, Universidade Técnica de Lisboa (IST), Lawrence Berkeley National Laboratory [Berkeley] (LBNL), University of California [Los Angeles] (UCLA), University of California, Deutsches Elektronen-Synchrotron [Hamburg] (DESY), Blackett Laboratory, Imperial College London, Central Laser Facility (CLF), STFC Rutherford Appleton Laboratory (RAL), Science and Technology Facilities Council (STFC)-Science and Technology Facilities Council (STFC), Max Planck Institute for Physics, National Institutes for Quantum and Radiological Science and Technology (QST), Ludwig-Maximilians-Universität München (LMU), Engineering & Physical Science Research Council (EPSRC), Commission of the European Communities, Science and Technology Facilities Council (STFC), Laboratoire pour l'utilisation des lasers intenses (LULI), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Field (physics), [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Fluids & Plasmas, particle beams, Physics, Multidisciplinary, laser-plasma interactions, General Physics and Astronomy, plasma interactions, plasma: wake field, 01 natural sciences, 010305 fluids & plasmas, Nuclear physics, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], 0103 physical sciences, ddc:530, accelerator: technology, 010306 general physics, plasma accelerators, activity report, Physics, Science & Technology, 02 Physical Sciences, accelerator: plasma, Plasma, Research needs, laser wakefield acceleration, Charged particle, Graduate students, free electron lasers, Physical Sciences, laser&#8211, strong field QED
Abstract

New journal of physics 23(3), 031101 (2021). doi:10.1088/1367-2630/abcc62, Plasma-based accelerators use the strong electromagnetic fields that can be supported by plasmas to accelerate charged particles to high energies. Accelerating field structures in plasma can be generated by powerful laser pulses or charged particle beams. This research field has recently transitioned from involving a few small-scale efforts to the development of national and international networks of scientists supported by substantial investment in large-scale research infrastructure. In this New Journal of Physics 2020 Plasma Accelerator Roadmap, perspectives from experts in this field provide a summary overview of the field and insights into the research needs and developments for an international audience of scientists, including graduate students and researchers entering the field., Published by IOP, [London]

Published
2021
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