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Development of control mechanisms for a laser wakefield accelerator-driven bremsstrahlung x-ray source for advanced radiographic imaging

C I D Underwood, C D Baird, C D Murphy, C D Armstrong, C Thornton, O J Finlay, M J V Streeter, M P Selwood, N Brierley, S Cipiccia2020年Plasma Physics and Controlled FusionIF 2.2出版社

A high power laser was used to accelerate electrons in a laser-driven wakefield accelerator. The high energy electrons were then used to generate an x-ray beam by passing them through a converter target. This bremsstrahlung source was characterised and used to perform penetrative imaging of industrially relevant samples. The photon spectrum had a critical energy in excess of 100 MeV and a source size smaller than the resolution of the diagnostic (150 µm). Simulations indicate a significantly smaller source is achievable. Variations in the x-ray source characteristics were realised through changes to the plasma and converter parameters while simulations confirm the adaptability of the source. Imaging of high areal density objects with 150 µm resolution was performed, demonstrating the unique advantages of this novel source.

日本語訳

高出力レーザーを用いて、レーザー駆動航跡場加速器内で電子を加速した。その後、高エネルギー電子をコンバーターターゲットに通過させることにより、X線ビームを生成した。この制動放射源を特性評価し、産業上重要な試料の透過イメージングに応用した。光子スペクトルの臨界エネルギーは100 MeVを超え、線源サイズは診断分解能(150 µm)よりも小さかった。シミュレーションにより、さらに小さな線源が実現可能であることが示された。X線源の特性の変化は、プラズマおよびコンバーターのパラメータを変更することで実現され、シミュレーションによって線源の適応性が確認された。高い面積密度を持つ物体のイメージングが150 µmの分解能で実施され、この新規線源の独自の利点が実証された。

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Wakefield accelerationLaser wakefield
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