Le Vendredi 12 Janvier 2024 à 11h00
On Friday January 12th, 2024, at 11:00 a.m.
En présentiel, salle René Gravier bt.506 RdC
Face-to-face, René Gravier room bldg.506 Groundfloor
Aura lieu le Séminaire / The following Seminar will be held:
“Experimental studies of extended-MHD effects and confinement properties of magnetized cylindrical implosions”
Présenté par / Presented by :
João Jorge Santos
Université de Bordeaux-CNRS-CEA,
CELIA UMR 5107, F-33405 Talence, France
Nous comptons sur votre présence !
We are looking forward your attending !
Résumé / Abstract :
The recent demonstration of nuclear fusion breakeven at the National Ignition Facility (NIF) is a major milestone towards fusion energy. One appealing scheme to further increase fusion yields is the addition of a background magnetic field (B-field). Indeed, the B-field compressed with the target acts in addition to inertia to confine the hot spot, resulting in a hotter fuel, allowing to ignite at lower areal densities than otherwise possible and with slower implosions that are less susceptible to hydrodynamic instabilities.
A cylindrical implosion platform facilitates less convoluted analysis of the magnetized transport of heat and magnetic flux and measurements of the imploding and stagnated plasma conditions [1], compared to spherical implosions. We present the design, numerical simulations, and experimental data of magnetized cylindrical implosions performed at the OMEGA laser.
The cylindrical targets are filled with Ar-doped D2 gas and imploded using a 40-beam, 14.5 kJ, 1.5 ns laser drive. A seed B-field of 30 T is applied along the axis of the targets. The implosions’ trajectory is followed by X-ray framed imaging [2], and the compressed core conditions are obtained via Ar K-shell emission spectroscopy. Measured spectra show distinctive features with and without an imposed magnetic field. A multi-zone spectroscopic diagnosis reveals a 50% core temperature rise at half mass-density when a 30T seed field is applied. Concurrently, experimental spectra align remarkably well with predictions from extended-MHD simulations, providing strong evidence that the attained core conditions at peak compression are consistent with the impact of a 10 kT compressed field [3].
[1] C.A. Walsh et al., Plasma Physics and Controlled Fusion 64, 025007 (2022)
[2] G. Pérez-Callejo et al., Rev. Sci. Instrum. 93, 113542 (2022)
[3] M. Bailly-Grandvaux et al., under revision at Phys. Rev. Lett.
En cas d’impossibilité d’être présent, le séminaire pourra être suivi via Skype (lien ci-dessous)
In case of impossibility to be present, the seminar can be followed via Skype (link below)
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+33 1 69 35 55 10 (France) Français (France)
ID de conférence : 8400344455
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CELIA UMR 5107, Université de Bordeaux-CNRS-CEA