Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Hirade, Tetsuya; Ando, Hirokazu*; Manabe, Kensuke*; Ueda, Daisuke*
Nuclear Instruments and Methods in Physics Research A, 931, p.100 - 104, 2019/07
Times Cited Count:7 Percentile:67.25(Instruments & Instrumentation)A detector identification method using waveform-shape analysis is proposed. A method for enabling discrimination of detectors by making a characteristic waveform shape for every detector by each own loop circuit on the detector is shown as an example. This method can be applied in many experimental contexts with detectors, making a high counting rate possible. Moreover, detector identification can be used for other important questions such as detector position. As an example, this detector identification method is used to perform positron-annihilation age-momentum correlation measurement with a high temporal resolution and a high counting rate.
Hirade, Tetsuya; Ando, Hirokazu*; Manabe, Kensuke*; Ueda, Daisuke*
no journal, ,
Although positron annihilation ray age-momentum correlation (AMOC) measurements can give information that cannot be obtained by other methods, it takes a long time to measure. The time resolution and the counting rate are in a trade-off relationship. We tried to improve the counting rate by increasing detectors. If the position of the detector deviates by 1 mm, it shifts 3 ps on the time axis. Even if multiple detectors are introduced, it is very difficult to match the time information obtained by each detector. Therefore, we have introduced each characteristic waveform to the signal from every detector. It was possible to identify a detector by use of a characteristic shape of waveforms, i.e. every spectrum for each detectors can be obtained. Afterward, every time shift for each spectrum can be calculated and then finally all of the events can be analyzed by correcting time shifts to construct one spectrum. Hence we succeeded to perform high count rate AMOC measurements.
平出 哲也; 安藤 太一; 真鍋 賢介; 上田 大介
not registered
【課題】複数の放射線検出器を並列に用いた場合に、各放射線検出器を同時に用いて高精度の測定を行わせる。 【解決手段】スタート用検出器11Aからのパルス出力P0A、スタート用検出器11Bからのパルス出力P0Bと、ストップ用検出器からのパルス出力P1との間の時間差ΔTを測定し、ΔTのヒストグラムを生成する。パルス出力P1とパルス出力P0Bの時間間隔は、パルス出力P0Aを基準とした場合において、本来の時間間隔であるΔTBに加えて一様にシフト時間Tだけ広がるように設定される。測定されたΔTのヒストグラムである図2の(III)においては、ΔTBに対してTが一様に付加されたために、左側のピークの分布がΔTAのヒストグラムに対応し、右側のピークの分布がΔTBのヒストグラムに対応する。このΔTBのヒストグラムを横軸方向にシフトさせれば、ΔTAのヒストグラムと重複させることができる。