A compact time‐of‐flight mass spectrometer for high‐flux cosmic dust analysis
作者： Daniel E Austin , JL Beauchamp , Heidi LK Manning , Carl L Bailey
DOI: 10.1029/2003JE002184
关键词:
摘要: [1] Time-of-flight mass spectrometers on spacecraft are the most direct method for determining chemical composition of cosmic dust grains. Miniaturization these instruments presents many challenges. Larger space-charge effects, greater deviations from paraxial approximation, and various ion-optical aberrations negatively affect resolution in small time-of-flight instruments. We report building testing an instrument design that may reduce effects. In addition to a linear reflectron, ions pass through ring aperture transmits only those with transverse velocity components fall within specific range. This novel focuses onto detector greatly reduced spherical aberration. Space-charge effects impact plate cratering grid scatter also using this design. Controlled impacts iron microparticles at several km/s demonstrate performance. is suited characterization regions very high flux, such as comet flyby, it have practical laboratory or field applications.
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