講演情報
[PPS01-P03]JUICE 搭載ガニメデレーザー高度計 (GALA) - 概要およびプロジェクト進捗
*塩谷 圭吾1、小林 正規2、木村 淳3、並木 則行4、荒木 博志4、野田 寛大4、押上 祥子1、鹿島 慎吾4、宇都宮 真4、石橋 高2、尾崎 正伸1、水野 貴秀1、斎藤 義文1、東原 和行1、鎌田 俊一5、松本 晃治4、倉本 圭5、佐々木 晶3、岩村 哲6、松本 吉昭7、藤井 雅之8、藤代 尚文9、佐藤 祐貴10、横沢 剛10、沼田 努10、水本 訓子10、水野 博行10、澤村 明彦10、谷本 和夫10、今井 久人11、中川 寛之11、桐野 宙治11、Hussmann Hauke12、Lingenauber Kay 12、Kallenbach Reinald 12、Althaus Christian 12、DelTogno Simone 12、Behnke Thomas12、Huettig Christian 12 (1.宇宙科学研究所、2.千葉工大、3.大阪大、4.国立天文台、5.北海道大、6.MRJ、7.PTIJ、8.FAMサイエンス、9.アストロオプト、10.明星電気、11.クリスタル光学、12.ドイツ航空宇宙センター)
キーワード：
GALA、JUICE、Jupiter、Ganumede、レーザ高度計
We present an introduction, current status, and role of the Japan team for the Ganymede Laser Altimeter (GALA) for the Jupiter Icy Moon Explorer (JUICE) mission. JUICE is a mission of ESA to be launched in 2022, and GALA is one of the payloads of JUICE.
Major objectives of GALA are to provide topographic data of Ganymede, the largest satellite of Jupiter, and to measure its tidal amplitudes. The latter is crucially important to detect and to characterize an underground ocean on Ganymede. Furthermore, GALA supports geological studies, e.g., identification of characterization of tectonic and cryo-volcanic regions, impact basins, and craters. GALA also provides information on surface roughness and the albedo.
For the laser altimetry, GALA emits and receives laser pulses at about 500 km altitude above Ganymede. Wavelength, energy, and repetition frequency of the laser plus are 1064 nm, 17 mJ, and 30 Hz, respectively. Reflected beam from the Ganymede surface is received by the receiver telescope with 25 cm diameter aperture, re-focused by the BEO including a narrow band-pass filter, and then detected by the APD detector.
Development of GALA is carried out in international collaboration by Germany, Japan, Switzerland, and Spain. GALA-Japan will develop the Backend Optics (BEO), the Focal Plane assembly (FPA) including an avalanche photo-diode (APD) detector, and the Analog Electronics module (AEM) in the receiver chain.
Major objectives of GALA are to provide topographic data of Ganymede, the largest satellite of Jupiter, and to measure its tidal amplitudes. The latter is crucially important to detect and to characterize an underground ocean on Ganymede. Furthermore, GALA supports geological studies, e.g., identification of characterization of tectonic and cryo-volcanic regions, impact basins, and craters. GALA also provides information on surface roughness and the albedo.
For the laser altimetry, GALA emits and receives laser pulses at about 500 km altitude above Ganymede. Wavelength, energy, and repetition frequency of the laser plus are 1064 nm, 17 mJ, and 30 Hz, respectively. Reflected beam from the Ganymede surface is received by the receiver telescope with 25 cm diameter aperture, re-focused by the BEO including a narrow band-pass filter, and then detected by the APD detector.
Development of GALA is carried out in international collaboration by Germany, Japan, Switzerland, and Spain. GALA-Japan will develop the Backend Optics (BEO), the Focal Plane assembly (FPA) including an avalanche photo-diode (APD) detector, and the Analog Electronics module (AEM) in the receiver chain.