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ISSN  2096-3955

CN  10-1502/P

Citation: Tang, S. W., Wang, Y., Zhao, H. Y., Fang, F., Qian, Y., Zhang, Y. J., Yang, H. B., Li, C. H., Fu, Q., Kong, J., Hu, X. Y., Su, H., Sun, Z. Y., Yu, Y. H., Zhang, B. M., Sun, Y., and Sun, Z. P. (2020). Calibration of Mars Energetic Particle Analyzer (MEPA). Earth Planet. Phys., 4(4), 355–363.

2020, 4(4): 355-363. doi: 10.26464/epp2020055


Calibration of Mars Energetic Particle Analyzer (MEPA)


Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China


Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou 730000, China


University of Chinese Academy of Sciences, Beijing 100049, China


Key Laboratory of Lunar and Deep Space Exploration, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China


National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China

Corresponding author: ZhiYu Sun, Yu,

Received Date: 2020-05-25
Web Publishing Date: 2020-07-20

The first Mars exploration mission of China (Tianwen-1) is scheduled to be launched in 2020; a charged particle telescope, the Mars Energetic Particle Analyzer (MEPA), is carried as one of the payloads on the orbiter. The MEPA is designed to measure solar energetic particles (SEPs) and galactic cosmic rays (GCRs) in the near-Mars space and in the transfer orbit from Earth to Mars. Before the launch, the MEPA was calibrated in ground experiments with radioactive sources, electronic pulses, and accelerator beams. The calibration parameters, such as energy conversion constants, threshold values for the triggers, and particle identification criteria, were determined and have been stored for onboard use. The validity of the calibration parameters has been verified with radioactive sources and beams. The calibration results indicate that the MEPA can measure charged particles reliably, as designed, and that it can satisfy the requirements of the Tianwen-1 mission.

Key words: Mars, Tianwen-1, MEPA, calibration

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Calibration of Mars Energetic Particle Analyzer (MEPA)

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