2.2.0 spase://SMWG/Instrument/Akebono/SMS Suprathermal Mass Spectrometer(SMS) 2011-02-23T17:36:22Z The Akebono Suprathermal Mass Spectrometer (SMS) is a radio-frequency ion mass spectrometer. It is designed to measure the mass composition and velocity distribution (mass-per-charge, energy-per-charge and angular distribution in the spacecraft spin-plane) of thermal and suprathermal (0.1-4000 eV/q) ions in the ionosphere and magnetosphere. It consists of a retarding potential analyzer, a 3-stage modified Bennett ion mass spectrometer, and a micro-channel plate detector. It can sample ions at 256 mass steps over the 1-80 AMU/q mass range, and 256 retarding potential steps in the 0.1-25.6V range, and 16 suprathermal energy steps in the 100-4000 V range. It operates in a number of fast scan and mass scan operational modes. For a detailed description of the SMS instrument and its operation, please see B. A. Whalen, J. R. Burrows, A. W. Yau, E. E. Budzinski, A. M. Pilon, I. Iwamoto, K. Marubashi, S. Watanabe, H. Mori, and E. Sagawa, The suprathermal ion mass spectrometer (SMS) onboard the EXOS?D satellite. J. Geomag. Geoelectr. 42, 511-536, 1990 and A. W. Yau, E. Drakou, M. J. Greffen, D. J. Knudsen, and E. Sagawa, Radio-frequency ion mass spectrometer measurements of thermal ion composition, velocity, and temperature: the EXOS-D Suprathermal Mass Spectrometer, Geophys. Monogr. Ser., 102, 307-312, 1998. See also http://www.darts.isas.jaxa.jp/akbn/readme/readme.sms.txt spase://SMWG/Person/Andrew.W.Yau PrincipalInvestigator MassSpectrometer Suprathermal Mass Spectrometer (SMS) spase://SMWG/Observatory/Akebono