서지주요정보
제궤도 위성을 이용한 우주 방사선 환경 관측 및 연구 = Measurement and analysis of space environment using low earth orbit satellites
서명 / 저자 제궤도 위성을 이용한 우주 방사선 환경 관측 및 연구 = Measurement and analysis of space environment using low earth orbit satellites / 신영훈.
저자명 신영훈 ; Shin, Young-Hoon
발행사항 [대전 : 한국과학기술원, 2000].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8010764

소장위치/청구기호

학술문화관(문화관) 보존서고

DPH 00007

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

The results of the space radiation experiments carried out on board the first two Korean technology demonstration microsatellites are presented in this research. The first satellite, KITSAT-1, launched in August 1992, carries a radiation monitoring payload CRE (Cosmic Ray Experiment) for characterizing the low-Earth orbit (LEO) radiation environment. The CRE consists of two sub-systems: the Cosmic Particle Experiment(CPE) and the Total Dose Experiment(TDE). In addition, SEU rates of the program memory and the RAM disk are also monitored. The peculiar behavior observed in the TDE (Total Dose Experiment) is identified as the thermal effect due to the change in the eclipse rate of the satellite. Similar behavior is seen in the laboratory experiment as the temperature of the RADFET, the TDE sensor, is varied from 20℃ to 80℃ while it is being irradiated with $Co^60$ γ-ray source. Present study focuses on the modeling effort of separating the radiation and thermal effects from the complicated data in which these two effects are simultaneously present. We derive the device parameters from the non-thermal irradiation data, and then include thermal annealing and conversion of oxide charges to estimate the oxide trap and interface state charges in the case of thermal variation. The model fits the experimental data quite successfully, which will enable us to estimate the pure radiation effect on the TDE experienced in space. The second satellite, KITSAT-2, launched in September 1993, carries a newly developed 32-bit OBC, KASCOM (KAIST Satellite Computer) in addition to OBC186. SEUs occurred in the KASCOM, as well as in the program memory and RAM disk memory, have been monitored since the beginning of the satellite operation. These two satellites, which are very similar in structures but different in orbits, provide a unique opportunity to study the effects of the radiation environment characterized by the orbit. KOMPSAT-1, which will be launched in the end of 1999, carries a space environment monitoring package SPS(Space Physics Sensor). SPS consists of two sub-systems : the High Energy Particle Detector (HEPD) and the Ionosphere Measurement Sensor (IMS). The IMS measures the {\rm in-situ} electron temperature and density in the ionosphere. This measurement is performed by operating one circular sensor plate (ETS) and one cylindrical antenna (LP) in a mode which provides a characteristic Langmuir probe measurement. The circular sensor plate is swept in voltage of 30 kHz sine oscillation with three different amplitudes and the DC component of the shifted voltage of the 30 kHz sine oscillation due to the surrounding plasma is measured with the corresponding amplitude. The DC component of the voltage shift is used to derive the electron temperature. The HEPD is to characterize the low altitude high energy particle environment and the effects on the microelectronics due to these high energy particles. It consists of four sensors: Proton and Electron Spectrometer(PES), Linear Energy Transfer Spectrometer(LET), Total Dose Monitor(TDM), and Single Event Monitor(SEM). 35 MeV proton beam from the medical KCCH cyclotron, at Korea Cancer Center Hospital in Seoul, is used to calibrate the PES. Primary proton beam of 35 MeV scattered by polypropylene target is converted to various energy protons according to the elastic collision kinematics. In this calibration, the threshold level of the proton in the PES can be determined and the energy ranges of PES channels are also calibrated.

서지기타정보

서지기타정보
청구기호 {DPH 00007
형태사항 iv, 133 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Young-Hoon Shin
지도교수의 한글표기 : 민경욱
지도교수의 영문표기 : Kyoung-Wook Min
수록잡지명 : "Analysis of Anomalous TDE Data on-board the KITSAT-1". IEEE Transcations on nuclear science, vol. 46, no. 6, (1999)
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 125-133
주제 우주 환경
방사선
저궤도
우리별 위성
Space environment
Radiation
LEO
KITSAT
QR CODE qr code