Abstract
We have developed a radiation environment monitor called the Technical Data Acquisition Equipment (TEDA) installed in the RAPid Innovative payload demonstration Satellite 1 (RAPIS-1) which was launched on January 18, 2019. The TEDA measured the energy spectra of electrons, protons, and He ions. In addition to the functions of a conventional sensor, we added a fast digital sampling function to the TEDA. The operational verification in orbit was successful, and the pile-up waveform signal was acquired for the first time at The Japan Aerospace Exploration Agency (JAXA). The TEDA also obtained data showing that pile-up detection also worked properly.
Highlights
A N UNDERSTANDING of the radiation environment in space is essential for safe space activities
If the state of the comparator signal was on at the time of crossover timing (COT) or if the time that state was on was longer than a predetermined value, the analog field-programmable gate array (FPGA) detected that a pile-up had occurred
In the T2 range, it was successfully indicated that the pile-up counter (PC) was the same as the pulse repetition frequency (PRF) and that the total counter (TC) was twice that of the PRF because of double triggering
Summary
A N UNDERSTANDING of the radiation environment in space is essential for safe space activities. In an environment with a high count rate, subsequent radiation enters before the preamplifier recovers, and the pulses overlap each other This phenomenon is called pile-up [10], and it leads to inaccurate energy measurements unless appropriate processing is done. The frequency of occurrence is extremely low, the TEDA has installed a breaker for power supply and a resistor element for current control on the circuit to prevent electronic components from failing when an SEL occurs. These design guidelines, applied to radiation tolerance, satisfy [12]. The LET channel is determined by dividing the energy value measured in S3 by the sensor thickness, and the count value of the LET channel is incremented
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