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Simulation on Thermal Ion Mass Spectrometer for MIT mission

Simulation on Thermal Ion Mass Spectrometer for MIT mission. KONG Linggao. Background of MIT mission. Four satellites: ITA, ITB, MA, MB The Thermal Ion Mass Spectrometer will aboard on MA and MB. Specification requirements of TIMS . Design of the instrument. ESA

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Simulation on Thermal Ion Mass Spectrometer for MIT mission

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  1. Simulation on Thermal Ion Mass Spectrometer for MIT mission KONG Linggao

  2. Background of MIT mission • Four satellites: ITA, ITB, MA, MB • The Thermal Ion Mass Spectrometer will aboard on MA and MB

  3. Specification requirements of TIMS

  4. Design of the instrument • ESA • Inner hemisphere diameter:91mm • Outer hemisphere diameter:100mm • Toroidal geometry • TOF： • Flight length: 30mm • Carbon foil thickness: 11nm

  5. Simulation on ESA (1) • Energy range: • E=kV • 0.6eV~500eV • k~5.5 • 0.12V~90.9V • Energy resolution：~11.7%

  6. Simulation on ESA (2) • Focus property: • Focus point is ~10mm below the exit of ESA Top View Side View

  7. Simulation on ESA (3) • Elevation angle range: • ~8°

  8. Simulation on TOF (1) • Carbon foil simulation • SRIM • Ions energy before carbon foil: 15keV, single energy point • Carbon foil thickness: 11nm • H+ • O+

  9. Simulation on TOF (2) • Secondary electrons from carbon foil • Secondary electrons distribution from the carbon foil: • random • Energy range: 0~20eV • Angular distribution: 30° conic • It is better to determine the incident ions’ direction by the location of secondary electrons on start MCP

  10. Simulation on TOF (3) • Mass discrimination • Flight length:30mm • The input ion source for the time of flight is from the simulation results of carbon foil. • For heavier ions, some (<10%) will hit the wall of the TOF part • H+

  11. Comparison between requirements and simulation results • From the simulation point of view, the instrument design can meet the requirements. • More work need to do when it is put into practice…..

  12. For discussion • Serrated for ESA or not? • Not serrated for CASSINI mission for low energy ion measurement • Carbon foil • Gold blacking? • Surface charging • High voltage • Other issues……

  13. Thanks !

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