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Pérez-Callejo G, Vlachos C, Walsh CA, Florido R, Bailly-Grandvaux M, Vaisseau X, Suzuki-Vidal F, McGuffey C, Beg FN, Bradford P, Ospina-Bohórquez V, Batani D, Raffestin D, Colaïtis A, Tikhonchuk V, Casner A, Koenig M, Albertazzi B, Fedosejevs R, Woolsey N, Ehret M, Debayle A, Loiseau P, Calisti A, Ferri S, Honrubia J, Kingham R, Mancini RC, Gigosos MA, Santos JJ. Cylindrical implosion platform for the study of highly magnetized plasmas at Laser MegaJoule. Phys Rev E 2022; 106:035206. [PMID: 36266806 DOI: 10.1103/physreve.106.035206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 07/25/2022] [Indexed: 06/16/2023]
Abstract
Investigating the potential benefits of the use of magnetic fields in inertial confinement fusion experiments has given rise to experimental platforms like the Magnetized Liner Inertial Fusion approach at the Z-machine (Sandia National Laboratories) or its laser-driven equivalent at OMEGA (Laboratory for Laser Energetics). Implementing these platforms at MegaJoule-scale laser facilities, such as the Laser MegaJoule (LMJ) or the National Ignition Facility (NIF), is crucial to reaching self-sustained nuclear fusion and enlarges the level of magnetization that can be achieved through a higher compression. In this paper, we present a complete design of an experimental platform for magnetized implosions using cylindrical targets at LMJ. A seed magnetic field is generated along the axis of the cylinder using laser-driven coil targets, minimizing debris and increasing diagnostic access compared with pulsed power field generators. We present a comprehensive simulation study of the initial B field generated with these coil targets, as well as two-dimensional extended magnetohydrodynamics simulations showing that a 5 T initial B field is compressed up to 25 kT during the implosion. Under these circumstances, the electrons become magnetized, which severely modifies the plasma conditions at stagnation. In particular, in the hot spot the electron temperature is increased (from 1 keV to 5 keV) while the density is reduced (from 40g/cm^{3} to 7g/cm^{3}). We discuss how these changes can be diagnosed using x-ray imaging and spectroscopy, and particle diagnostics. We propose the simultaneous use of two dopants in the fuel (Ar and Kr) to act as spectroscopic tracers. We show that this introduces an effective spatial resolution in the plasma which permits an unambiguous observation of the B-field effects. Additionally, we present a plan for future experiments of this kind at LMJ.
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Affiliation(s)
- G Pérez-Callejo
- Université de Bordeaux-CNRS-CEA, Centre Lasers Intenses et Applications (CELIA), UMR 5107, F-33405 Talence, France
- Departamento de Física Teórica, Atómica y Óptica, Universidad de Valladolid, 47011 Valladolid, Spain
| | - C Vlachos
- Université de Bordeaux-CNRS-CEA, Centre Lasers Intenses et Applications (CELIA), UMR 5107, F-33405 Talence, France
- Institute of Plasma Physics & Lasers, Hellenic Mediterranean University Research Centre, 74100 Rethymno, Greece
| | - C A Walsh
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Florido
- iUNAT-Departamento de Física, Universidad de Las Palmas de Gran Canaria, 35017 Las Palmas de Gran Canaria, Spain
| | - M Bailly-Grandvaux
- Center for Energy Research, University of California-San Diego, La Jolla, California 92093, USA
| | | | - F Suzuki-Vidal
- Plasma Physics Group, The Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom
| | - C McGuffey
- General Atomics, San Diego, California 92121, USA
| | - F N Beg
- Center for Energy Research, University of California-San Diego, La Jolla, California 92093, USA
| | - P Bradford
- Université de Bordeaux-CNRS-CEA, Centre Lasers Intenses et Applications (CELIA), UMR 5107, F-33405 Talence, France
| | - V Ospina-Bohórquez
- Université de Bordeaux-CNRS-CEA, Centre Lasers Intenses et Applications (CELIA), UMR 5107, F-33405 Talence, France
- CEA, DAM, DIF, F-91297 Arpajon, France
- University of Salamanca, 37008 Salamanca, Spain
- Université Paris-Saclay, CEA, Laboratoire Matière en Conditions Extrêmes, 91680 Bruyères-le-Châtel, France
| | - D Batani
- Université de Bordeaux-CNRS-CEA, Centre Lasers Intenses et Applications (CELIA), UMR 5107, F-33405 Talence, France
| | - D Raffestin
- Université de Bordeaux-CNRS-CEA, Centre Lasers Intenses et Applications (CELIA), UMR 5107, F-33405 Talence, France
| | - A Colaïtis
- Université de Bordeaux-CNRS-CEA, Centre Lasers Intenses et Applications (CELIA), UMR 5107, F-33405 Talence, France
| | - V Tikhonchuk
- Université de Bordeaux-CNRS-CEA, Centre Lasers Intenses et Applications (CELIA), UMR 5107, F-33405 Talence, France
- ELI-Beamlines, Institute of Physics, Czech Academy of Sciences, 25241 Dolní Brezany, Czech Republic
| | - A Casner
- Université de Bordeaux-CNRS-CEA, Centre Lasers Intenses et Applications (CELIA), UMR 5107, F-33405 Talence, France
- CEA-CESTA, CS 60001, 33116 Le Barp Cedex, France
| | - M Koenig
- LULI-CNRS, CEA, Sorbonne Universites, Ecole Polytechnique, Institut Polytechnique de Paris, F-91128 Palaiseau Cedex, France
| | - B Albertazzi
- LULI-CNRS, CEA, Sorbonne Universites, Ecole Polytechnique, Institut Polytechnique de Paris, F-91128 Palaiseau Cedex, France
| | - R Fedosejevs
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, T6G1R1 Alberta, Canada
| | - N Woolsey
- Department of Physics, University of York, Heslington YO10 5DD, United Kingdom
| | - M Ehret
- Centro de Laseres Pulsados, Building M5, Science Park, 37185 Villamayor, Salamanca, Spain
| | - A Debayle
- CEA, DAM, DIF, F-91297 Arpajon, France
- Université Paris-Saclay, CEA, Laboratoire Matière en Conditions Extrêmes, 91680 Bruyères-le-Châtel, France
| | - P Loiseau
- CEA, DAM, DIF, F-91297 Arpajon, France
- Université Paris-Saclay, CEA, Laboratoire Matière en Conditions Extrêmes, 91680 Bruyères-le-Châtel, France
| | - A Calisti
- Aix Marseille Université, CNRS, PIIM, F-13013 Marseille, France
| | - S Ferri
- Aix Marseille Université, CNRS, PIIM, F-13013 Marseille, France
| | - J Honrubia
- ETSI Aeronáutica y del Espacio, Universidad Politécnica de Madrid, 28040 Madrid, Spain
| | - R Kingham
- Plasma Physics Group, The Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom
| | - R C Mancini
- Department of Physics, University of Nevada, Reno, Nevada 89557, USA
| | - M A Gigosos
- Departamento de Física Teórica, Atómica y Óptica, Universidad de Valladolid, 47011 Valladolid, Spain
| | - J J Santos
- Université de Bordeaux-CNRS-CEA, Centre Lasers Intenses et Applications (CELIA), UMR 5107, F-33405 Talence, France
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Florido R, Rodríguez R, Gil JM, Rubiano JG, Martel P, Mínguez E, Mancini RC. Modeling of population kinetics of plasmas that are not in local thermodynamic equilibrium, using a versatile collisional-radiative model based on analytical rates. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2009; 80:056402. [PMID: 20365078 DOI: 10.1103/physreve.80.056402] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2009] [Indexed: 05/29/2023]
Abstract
We discuss the modeling of population kinetics of nonequilibrium steady-state plasmas using a collisional-radiative model and code based on analytical rates (ABAKO). ABAKO can be applied to low-to-high Z ions for a wide range of laboratory plasma conditions: coronal, local thermodynamic equilibrium or nonlocal thermodynamic equilibrium, and optically thin or thick plasmas. ABAKO combines a set of analytical approximations to atomic rates, which yield substantial savings in computer running time, still comparing well with more elaborate codes and experimental data. A simple approximation to calculate the electron capture cross section in terms of the collisional excitation cross section has been adapted to work in a detailed-configuration-accounting approach, thus allowing autoionizing states to be explicitly included in the kinetics in a fast and efficient way. Radiation transport effects in the atomic kinetics due to line trapping in the plasma are taken into account via geometry-dependent escape factors. Since the kinetics problem often involves very large sparse matrices, an iterative method is used to perform the matrix inversion. In order to illustrate the capabilities of the model, we present a number of results which show that the ABAKO compares well with customized models and simulations of ion population distribution. The utility of ABAKO for plasma spectroscopic applications is also outlined.
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Affiliation(s)
- R Florido
- Departamento de Física, Universidad de Las Palmas de Gran Canaria, Las Palmas de Gran Canaria 35017, Spain
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