Abstract
A major challenge the HiPER [1] project is facing is to derive laser architectures satisfying simultaneously all HiPER requirements; among them, high wall-plug efficiency (15 to 20%) and repetition rate (around 10 Hz) are the most challenging constraints. Several groups over the world are actively pursuing research in the field of High average power Diode Pumped Solid State Lasers (DPSSL) [2]. We propose a comprehensive solution for a 1 kJ DPSSL beamline as the unit brick of a 12 beams bundle.
Highlights
HiPER (High Power laser Energy Research) [1, 3, 4] in Europe, LIFE (Laser Inertial Fusion Engine) [5] in the United States of America and GENBU (Generation of ENergetic Beam Ultimate) [6] in Japan are scientific programs dedicated to demonstrate the feasibility of laser driven fusion [1] as a future energy source.The Centre National de la Recherche Scientifique (CNRS) Laboratoire pour l’Utilisation des Lasers Intenses (LULI) at Ecole Polytechnique, Palaiseau, France is working on a HiPER scheme relying on Yb3+:YAG cryo-cooled active mirror amplifiers
We propose a comprehensive solution for a 1 kJ Diode Pumped Solid State Lasers (DPSSL) beamline as the unit brick of a 12 beams bundle
Thermal management [7] and Amplified Spontaneous Emission management [8] solutions proposed within the LULI Lucia program framework helped us deriving an optimum point of operation
Summary
HiPER (High Power laser Energy Research) [1, 3, 4] in Europe, LIFE (Laser Inertial Fusion Engine) [5] in the United States of America and GENBU (Generation of ENergetic Beam Ultimate) [6] in Japan are scientific programs dedicated to demonstrate the feasibility of laser driven fusion [1] as a future energy source. Six amplifiers in a double pass configuration will be required to reach the 1 kJ unit beam (called “Beamlet”) requirement for HiPER. A single beamline (see arrangement of 12 beamlets on figure 1) will be based on 9 beamlets to be incoherently combined for compression pulses. Considering the requirements in terms of spot size, the 3 remaining beamlets will be coherently combined for shock ignition pulses. The laser requirements are summarized in the table of figure 1
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