Experimental demonstration of particle energy, conversion efficiency and spectral shape required for ion-based fast ignition

B.M. Hegelich, D. Jung, B.J. Albright, J.C. Fernandez, D.C. Gautier, C. Huang, T.J. Kwan, S. Letzring, S. Palaniyappan, R.C. Shah, H.-C. Wu, L. Yin, A. Henig, R. Hörlein, D. Kiefer, J. Schreiber, X.Q. Yan, T. Tajima, D. Habs, B. DromeyJ.J. Honrubia

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53 Citations (Scopus)

Abstract

Research on fusion fast ignition (FI) initiated by laser-driven ion beams has made substantial progress in the last years. Compared with electrons, FI based on a beam of quasi-monoenergetic ions has the advantage of a more localized energy deposition, and stiffer particle transport, bringing the required total beam energy close to the theoretical minimum. Due to short pulse laser drive, the ion beam can easily deliver the 200 TW power required to ignite the compressed D-T fuel. In integrated calculations we recently simulated ion-based FI targets with high fusion gain targets and a proof of principle experiment [1]. These simulations identify three key requirements for the success of ion-driven fast ignition (IFI): (1) the generation of a sufficiently high-energetic ion beam (approximate to 400-500 MeV for C), with (2) less than 20% energy spread at (3) more than 10% conversion efficiency of laser to beam energy. Here we present for the first time new experimental results, demonstrating all three parameters in separate experiments. Using diamond nanotargets and ultrahigh contrast laser pulses we were able to demonstrate >500 MeV carbon ions, as well as carbon pulses with Delta E/E
Original languageEnglish
Pages (from-to)083011
Number of pages1
JournalNUCLEAR FUSION
Volume51
Issue number8
DOIs
Publication statusPublished - Aug 2011

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