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高速合成CVD単結晶ダイヤモンドによる14MeV中性子応答関数測定

Response function measurement for 14 MeV neutrons by a CVD single diamond crystal synthesized with high-growth rate

佐藤 圭*; 垣本 明徳*; 金子 純一* ; 藤田 文行*; 坪内 信輝*; 杢野 由明*; 茶谷原 昭義*; 佐藤 聡; 今野 雄太*; 本間 彰*; 鹿田 真一*; 古坂 道弘*

Sato, Kei*; Kakimoto, Akinori*; Kaneko, Junichi*; Fujita, Fumiyuki*; Tsubouchi, Nobuteru*; Mokuno, Yoshiaki*; Chayahara, Akiyoshi*; Sato, Satoshi; Konno, Yuta*; Homma, Akira*; Shikata, Shinichi*; Furusaka, Michihiro*

人工ダイヤモンドによる14MeV中性子エネルギースペクトロメーターの実用化に向けて、結晶合成及び各種評価を行っている。本研究では、高品質大型基板開発の一環として、産業技術総合研究所で基板用用途向けに高速合成された一辺9mm程度の三角形の大型CVD単結晶ダイヤモンド自立膜から、マイクロ波プラズマCVD装置を使用し、基板温度:900度,ガス圧力:160Torr,メタン濃度:10%で結晶を合成し、検出器を試作した。本検出器を用いて、原子力機構の核融合中性子源(FNS)で、14MeV中性子応答関数測定実験を行い、$$^{12}$$C(n,$$alpha$$)$$^{9}$$Be反応によるピーク(4%程度のエネルギー分解能)の観測に成功した。これによりメタン濃度10%の高メタン濃度の合成条件でもエネルギースペクトロメーターグレードのCVD単結晶が得られることがわかった。

As a part of development of diamond energy spectrometers using the $$^{12}$$C(n,$$alpha$$)$$^{9}$$Be reaction for DT plasma ion temperature measurement, response functions measurement of chemical vapor deposition (CVD) single crystal diamonds for alpha particles and 14 MeV neutrons were carried out. One diamond sample was synthesized by the national institute of advanced industrial science and technology (AIST) aiming at a large size and high-quality substrate for electric device with higher methane concentration of 10%. This diamond crystal was chosen according to intensity of free exciton recombination luminescence. In addition, a CVD single crystal diamond, categorized in "detector grade" synthesized by Element 6 Inc. was evaluated.Response function measurement of 14 MeV neutrons were carried out at the Fusion Neutronic Source facility of Japan Atomic Energy Agency. Energy resolutions of 4.3% and 5.2% for the $$^{12}$$C(n,$$alpha$$)$$^{9}$$Be reaction were obtained by the two CVD diamond single crystals. In general, energy spectrometer grade CVD diamond single crystals are grown using lower methane concentration, i.e., 1%. However, this results revealed that even higher methane concentration of 10% can grow energy spectrometer grade CVD diamond single crystals.

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