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Spacecraft bus voltage and power

experimental solar power satellite. 4. 10. 3. 10. space factory、 space hotel. ISS. 2. 10. Spacecraft power (kW). HS702. SKYLAB. 10. MILSTAR. SPACE. ETS-8. TELESCOPE. TDRS. Before mid-90s. 1. EOS-AM. LEASAT. RCA SATCOM. After mid-90s. DSCS II. After 2010. 0.1. 10. 100.

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Spacecraft bus voltage and power

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  1. experimental solar power satellite 4 10 3 10 space factory、 space hotel ISS 2 10 Spacecraft power (kW) HS702 SKYLAB 10 MILSTAR SPACE ETS-8 TELESCOPE TDRS Before mid-90s 1 EOS-AM LEASAT RCA SATCOM After mid-90s DSCS II After 2010 0.1 10 100 1000 Bus voltage(V) Spacecraft bus voltage and power severe plasma interaction 400V is necessary for next-generation 1MW large space platform after ISS

  2. Spacecraft potential in LEO

  3. How an arc occur?

  4. Repeated arcing and charging process Charging of coverglass by ions Field intensification at triple junction Field emission of electrons Ionization of desorbed gas Neutralization of coverglass charge

  5. Sustained arc

  6. Test facility

  7. GEO Plasma Environment Test Chamber Electron beam (max30kV) Trek probe • Operational since March 2002 • Diameter 60cm, Length 90cm • Minimum Pressure 3x10-7Torr • Equipped with an electron beam gun, a non-contacting surface potential probe, a Kaufman type plasma source, a xy-stage, a low-pressure mercury lamp, halogen heat lamps, a video-image analysis system Trek probe Solar array coupon X-Y stage X-Y stage controller

  8. LEO Plasma Environment Test Chamber • Operational since 1998 • Diameter 1m, Length 1.2m (excluding sub-chamber) • Minimum pressure 1x10-6Torr • Plasma density 1x1012m-3 or above • Equipped with an ECR plasma source, a deuterium UV lamp, a mass spectrometer, a x-y stage, a video-image analysis system, a high speed data acquisition system, halogen heat lamps, a spectrum analyzer, a metal-halaide lamp

  9. P r e s s u r e c h a m b e r ( 1 M P a ) = 6 0 0 m m f

  10. Measurement of gas properties Measurement of flashover voltage time Vfo density time temperature Build-up of database Vfo density temperature

  11. Distribution of charge exchange ions and neutralizer electrons near a GEO satellite with an ion thruster Ion density Electron density

  12. z r B x r v d y Example of three-dimensional simulations

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