DPF Department of Physics the University of Tokyo

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DPFにおける地球重力場の影響 安東 正樹 Department of Physics, the University of Tokyo Tsubono Group Seminar (23

DPFにおける地球重力場の影響 安東 正樹 Department of Physics, the University of Tokyo Tsubono Group Seminar (23 July, 2008)

Gravity-gradient noise Global gravity field model Cut-off at 0. 03 Hz: originates in the

Gravity-gradient noise Global gravity field model Cut-off at 0. 03 Hz: originates in the model resolution Unknown at higher frequency This will not be a problem: Satellite velocity of 5 km/sec higher-order contribution will be negligible Estimate the noise spectrum order of ~(Re/r) n Assume 2% vertical-horizontal coupling Observe gravity field with higher resolution? Public data obtained by GRACE 　 Up to 150 th-order in spherical harmonics Tsubono Group Seminar (23 July, 2008) 3

地球重力モデル Sputonik 1 (1957), Vanguard 1 (1959) J 2項の推定 1966 -1977 : SAOモデル (8

地球重力モデル Sputonik 1 (1957), Vanguard 1 (1959) J 2項の推定 1966 -1977 : SAOモデル (8 -18次) 1972 -1977 : GEM 1 -GEM 10モデル (12 -22次) 1981: GEM 10 Cモデル (180次) 1996: EGM 96モデル (360次) 2003: EIGEN-2 (140次, CHAMP) 2008: EGM 2008モデル (2190次, GRACE) Tsubono Group Seminar (23 July, 2008) 7

DPF ペイロード Upper half of the satellite Weight : ~100 kg Size : ~90

DPF ペイロード Upper half of the satellite Weight : ~100 kg Size : ~90 cm cube Laser source Nd: YAG laser (1064 nm) Power : 25 m. W Freq. stab. by reference cavity Drag-free control Local sensor signal 　　 Feedback to mission thrusters Fabry-Perot interferometer 　 Finesse : 100 　 Length : 30 cm 　Test mass : 1 kg Signal extraction by PDH Tsubono Group Seminar (23 July, 2008) 13

End 　 Tsubono Group Seminar (23 July, 2008) 20

End 　 Tsubono Group Seminar (23 July, 2008) 20

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