Development of medium and high energy electron instrument with active collimated shield

当我们知道高能粒子加速过程中的微小机制时，从几十keV到几MeV的电子观测需要对时间、俯仰角和能量进行高分辨率的测量。然而，日本对能量在10keV-几MeV的电子的观测装置，在精度上还不够好。本研究采用了作为伽马射线等测量技术的井式有源柯利计，研制了即使在高计数率辐射环境下，高能粒子也能正确行为的电子测量系统。同时，为了提高中能区的能量测量精度，研制了双面硅条探测器和专用读出电路。通过将井型CSI闪烁体和DSSD相结合，我们能够在几度内确定高能电子的入射方向。航天器上使用的仪器由于粒子堆积，在高辐射环境下无法正确测量电子的能量或通量。我们成功地研制出了由数字存储器件和读数芯片组成的新型仪器，能够在高辐射环境下准确地测量电子的能量和通量。

When we know the minute mechanism in the acceleration process of a high-energy particle the electron observation from a few ten keV to several MeV needs to be measured with high resolution about time, pitch angle and energy. However, the observation devices of the electron that had the energy of several 10 keV -several MeV, there is not the good thing of accuracy sufficiently in Japan.By applying the well style active collie meter that has been used as the measurement technology such as gamma ray in this research, we did the development of the electron measuring system that a high-energy particle acts correctly, even in the high-count rate radiation environment. Also, both a double-sided Si strip detector (DSSD) and an exclusive reading circuit of the DSSD were developed to improve energy measurement accuracy for the middle energy range. By combining the well style CsI scintillater and DSSD, we were able to decide the incidence direction of a high-energy electron within several degrees. The instrument that had been used in spacecraft was unable to measure energy or flux of electrons correctly under the high radiation environment because of pile-up of particles. We successes the development of the new instrument that were consisted of DSSDs and reading chips developed in this study had been able to measure both the energy and the flux of electrons exactly under the high radiation environment.