Development of a hadron blind detector using a finely segmented pad readout

作者：Kanno Koki^*; Aoki Kazuya; Aramaki Yoki; En'yo Hideto; Kawama Daisuke; Komatsu Yusuke; Masumoto Shinichi; Nakai Wataru; Obara Yuki; Ozawa Kyoichiro; Sekimoto Michiko; Shibukawa Takuya; Takahashi Tomonori; Watanabe Yosuke; Yokkaichi Satoshi

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2016, 819: 20-24.

DOI：10.1016/j.nima.2016.02.063

• Hadron blind detector
• HBD
• GEM
• CsI photocathode
• UV photon detector

We constructed a hadron blind detector (HBD) using a finely segmented pad readout. The finely segmented pad readout enabled us to adopt an advanced particle identification method which applies a threshold to the number of pad hits in addition to the total amount of collected charge. The responses of the detector to electrons and pions were evaluated using a negatively charged secondary beam at 1.0 GeV/c containing 20% electrons at the J-PARC K1.1BR beam line. We observed 7.3 photoelectrons per incident electron. Using the advanced particle identification method, an electron detection efficiency of 83% was achieved with a pion rejection factor of 120. The method improved the pion rejection by approximately a factor of five, compared to the one which just applies a threshold to the amount of collected charge. The newly introduced finely segmented pad readout was found to be effective in rejecting pions.

• 出版日期2016-5-21
• 单位RIKEN