17:15 〜 18:45
[PCG20-P13] Development of CHARMS-c: an in-situ space charge monitor for satellite materials adapted by the pulsed electroacoustic method
キーワード：放射線帯、宇宙天気、帯電、PEA法
Energetic charged particles in geospace could be causes of various anomalies on spacecraft. The charged particles, such as energetic electrons and protons trapped in the Earth’s magnetosphere are expected to build the electric potential up due to accumulation of the charged particles inside materials exposed in space environment. In-situ measurement of the space charge accumulation is necessary to assess the risk of sudden electrostatic discharge that causes anomalies on spacecraft.
We have developed the engineering model of space charge monitor considered to be installed on geostationary satellite. We refer to the space charge monitor as “CHARMS-c” in the suite of CHArge and Radiation Monitors for Space weather (CHARMS) developed under the support of the Ministry of Internal Affairs and Communication, Japan, Research and Development of observing technology on Himawari satellite. The equipment is able to measure space charge distribution in the bulk of a dielectric material adapted by the pulsed elctroacoustic (PEA) method. The PEA method applies several nano-second time width pulsed voltage into the dielectric material, then the pulse generates pressure waves associated with the space charge distribution accumulating inside. While a typical space charge monitor requires two electrodes that directly contact with the material, the CHARMS-c has a non-contact, meshed electroforming electrode on the irradiation side. With the meshed electrode, energetic particles coming from space environment can hit to the material without shielding. The measurement enables us to obtain the space charge distribution inside the material exposed in the space environment. The in-situ measurement on spacecraft gives opportunities to assess the risk of electrostatic discharge. In this talk we will introduce the CHARMS-c, which is the innovative space charge monitor that can be used for risk management of spacecraft under severe space weather.
We have developed the engineering model of space charge monitor considered to be installed on geostationary satellite. We refer to the space charge monitor as “CHARMS-c” in the suite of CHArge and Radiation Monitors for Space weather (CHARMS) developed under the support of the Ministry of Internal Affairs and Communication, Japan, Research and Development of observing technology on Himawari satellite. The equipment is able to measure space charge distribution in the bulk of a dielectric material adapted by the pulsed elctroacoustic (PEA) method. The PEA method applies several nano-second time width pulsed voltage into the dielectric material, then the pulse generates pressure waves associated with the space charge distribution accumulating inside. While a typical space charge monitor requires two electrodes that directly contact with the material, the CHARMS-c has a non-contact, meshed electroforming electrode on the irradiation side. With the meshed electrode, energetic particles coming from space environment can hit to the material without shielding. The measurement enables us to obtain the space charge distribution inside the material exposed in the space environment. The in-situ measurement on spacecraft gives opportunities to assess the risk of electrostatic discharge. In this talk we will introduce the CHARMS-c, which is the innovative space charge monitor that can be used for risk management of spacecraft under severe space weather.