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Advanced-ignition-concept exploration on OMEGA

W Theobald, K S Anderson, R Betti, R S Craxton, J A Delettrez, J A Frenje, V Yu Glebov, O V Gotchev, J H Kelly, C K Li2009年Plasma Physics and Controlled FusionIF 2.2出版社

Advanced ignition concepts, such as fast ignition and shock ignition, are being investigated at the Omega Laser Facility. Integrated fast-ignition experiments with room-temperature re-entrant cone targets have begun, using 18 kJ of 351 nm drive energy to implode empty 40 µm thick CD shells, followed by 1.0 kJ of 1053 nm wavelength, short-pulse energy. Short pulses of 10 ps width have irradiated the inside of a hollow gold re-entrant cone at the time of peak compression. A threefold increase in the time-integrated, 2 to 7 keV x-ray emission was observed with x-ray pinhole cameras, indicating that energy is coupled from the short-pulse laser into the core by fast electrons. In shock-ignition experiments, spherical plastic-shell targets were compressed to high areal densities on a low adiabat, and a strong shock wave was sent into the converging, compressed capsule. In one experiment, 60 beams were used with an intensity spike at the end of the laser pulse, and the implosion performance was studied through neutron-yield and areal-density measurements. In a second experiment, the 60 OMEGA beams were split into a 40+20 configuration, with 40 low-intensity beams used for fuel assembly and 20 delayed beams with a short, high-intensity pulse shape (up to 1 × 1016 W cm−2) for shock generation.

日本語訳

高度な点火概念、例えば高速点火や衝撃点火は、オメガレーザー施設で研究されている。室温の再入射コーンターゲットを用いた統合高速点火実験が開始されており、351 nmの駆動エネルギー18 kJを用いて、厚さ40 µmの空のCDシェルを爆縮し、続いて1053 nm波長の短パルスエネルギー1.0 kJを照射した。10 ps幅の短パルスが、最大圧縮時に中空の金再入射コーンの内部に照射された。時間積分された2〜7 keVのX線 emission において3倍の増加がX線ピンホールカメラで観測され、短パルスレーザーから高速電子によるコアへのエネルギー結合が示された。衝撃点火実験では、球形プラスチックシェルターゲットが低断熱線上で高い面密度まで圧縮され、強力な衝撃波が収束中の圧縮カプセルに送り込まれた。1つの実験では、60ビームがレーザーパルス終端の強度スパイクとともに使用され、爆縮性能が中性子収量と面密度測定を通じて研究された。2つ目の実験では、60本のオメガビームが40+20構成に分割され、40本の低強度ビームが燃料アセンブリに使用され、20本の遅延ビームが衝撃波生成のための短い高強度パルス形状(最大1 × 10¹⁶ W cm⁻²)で使用された。

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