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Accueil > A propos du LPP > Communication > Actualités archivées > 2016 > Collaboration between LPP and the University of Nevada, Reno (UNR) : new configuration of Z-pinches for Inertial Confinement Fusion and the first realization of a civil current-driven indirect heating cavity, called hohlraum

Collaboration between LPP and the University of Nevada, Reno (UNR) : new configuration of Z-pinches for Inertial Confinement Fusion and the first realization of a civil current-driven indirect heating cavity, called hohlraum

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In 2013-2015, a configuration of indirect-heating cavity, called Hohlraum (hr), was realized and studied in the team of Prof. V. Kantsyrev on Zebra generator at the University of Nevada in Reno, with the participation of LPP, according to a design of A. Chuvatin from the LPP Hot Transient Plasmas team [invited presentation at the workshop RHEDP 2015]. In difference with the hr proposed by the LLNL (Livermore) for cylindrical Z-pinches [e.g. Phys. Plasmas 14, March 2007], the X-ray sources are driven in parallel by a high pulse power generator (HPP) and the plasmas are created from planar wire-arrays (PWA) extensively studied in the UNR Kantsyrev’s team [LPP in the Headlines 2010]. The corresponding device (left image), allowing equal division of the generator currents [LPP in the Headlines July 2013], has experimentally demonstrated for the first time that such an hr would be more compact than the Livermore’s one with two pinches and could provide symmetric X-ray sources (middle image). In addition, the radiative temperature TR was measured (middle image) (50 ±5 eV on gold walls and 37±3 eV on an acrylic ∅1.5 mm target) and compared to the radiation field distribution simulated with the VISRAD code [Phys.Rev.E 90, December 2014].
 

These experiments, together with numerical simulations, are the first ever made with an HPP hr in a University laboratory. This opens new perspectives for the study of indirectly-driven Inertial Controlled Fusion (ICF) as demonstrates new hr configuration presently proposed by LPP (A. Chuvatin) and UNR (V. Kantsyrev), right image. In this hr, the principle of symmetrical distribution of currents and X-ray radiation, now experimentally validated, is used for 6 PWA sources arranged "as a star". Simulations with VISRAD of this concept for the parameters of Sandia’s Z machine give an estimate of the radiative temperature TR 85 eV [RHEDP 2015] in comparison with 70 eV for the FCI HPP scheme proposed by Livermore for two cylindrical Z-pinches.

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