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The use of silicon photodiodes for x-ray diagnostics in the PALS plasma experiments

L Ryć, J Badziak, L Juha, J Krása, B Králiková, L Láska, P Parys, M Pfeifer, K Rohlena, J Skála2003年Plasma Physics and Controlled FusionIF 2.2出版社

Silicon photodiodes of different types were tested for the possibility of measurement of high-intensity x-ray pulses from the plasmas produced by the 1 kJ PALS laser system in Prague. The x-ray energy range of the operation of the detectors was 1–20 keV. The tests were done with the use of different targets at the laser energy up to 740 J in the case of fundamental frequency (1ω, 1315 nm) and up to 230 J in the case of the 3rd harmonics (3ω). The detectors that were assigned for the measurement of the harder part of the spectrum (5–20 keV) can operate without overloading at all laser energies used, but the detectors for soft radiation can be easily overloaded above 200 J (at the fundamental frequency). Some problems with noise compatibility were encountered, as well. The possible improvements of detection systems for the future experiments are proposed. The detectors investigated in the experiment can be applied for finding the optimal condition for producing the hottest plasmas and for a precise calibration of the target positioning system.

日本語訳

異なる種類のシリコンフォトダイオードについて、プラハの1 kJ PALSレーザーシステムによって生成されたプラズマからの高強度X線パルスの測定可能性を試験した。検出器の動作におけるX線エネルギー範囲は1〜20 keVであった。試験は、基本周波数(1ω、1315 nm)の場合には最大740 J、第3高調波(3ω)の場合には最大230 Jのレーザーエネルギーにおいて、異なるターゲットを用いて実施された。スペクトルのより硬い部分(5〜20 keV)の測定に割り当てられた検出器は、使用されたすべてのレーザーエネルギーにおいて過負荷なしで動作できるが、軟X線用の検出器は200 Jを超えると(基本周波数において)容易に過負荷になる可能性がある。ノイズ適合性に関するいくつかの問題も発生した。将来の実験のための検出システムの可能な改良が提案されている。実験で調査された検出器は、最も高温のプラズマを生成するための最適条件を見つけることや、ターゲット位置決めシステムの精密な較正に応用できる。

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