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WE PROPOSE DEVELOPING A NEW HEAVY ION MASS SPECTROMETER AS PART OF THE TECHNOLOGY DEVELOPMENT OPPORTUNITY (TDO) FOR THE IMAP MISSION WHICH WILL BE CAPABLE OF RESOLVING SINGLY CHARGED PICKUP SOLAR WIND AND SUPRATHERMAL IONS IN TRIPLE COINCIDENCE. THIS SPECTROMETER IS DESIGNED TO FIT THE ENVELOPE ALLOCATED BY THE TDO OPPORTUNITY PRESENTED BY THE SELECTED PI-LED IMAP PAYLOAD TEAM. THE PROPOSED SOLAR WIND AND PICKUP ION COMPOSITION ENERGY SPECTROMETER (SPICES) IS A TOF-E SPECTROMETER DEDICATED TO MEASURING THE THERMAL SOLAR WIND PUI AND SUPRATHERMAL PARTICLES OVER AN ENERGY RANGE EXTENDING FROM 0.5 130 KEV/E. SPICES HAS A COLLECTING POWER>10 TIMES BETTER THAN THE ADVANCED COMPOSITION EXPLORER (ACE) SOLAR WIND ION COMPOSITION SPECTROMETER (SWICS) [GLOECKLER ET AL. 1998] THE MESSENGER FAST IMAGING PLASMA SPECTROMETER (FIPS) [ANDREWS ET AL. 2007] AND THE WIND SUPRATHERMAL ION COMPOSITION SPECTROMETER (STICS) [GLOECKLER ET AL. 1995]. ITS PRINCIPAL OF OPERATION IS IDENTICAL TO THAT USED IN ULYSSES/SWICS AND ACE/SWICS WITH DECADES OF HIGHLY SUCCESSFUL FLIGHT OPERATIONS. SPICES HAS A GEOMETRIC FACTOR THAT IS 10 TIMES LARGER THAN THE SOLAR ORBITER HEAVY ION SENSOR (HIS). THIS INCREASED COLLECTING POWER ENABLES OBSERVATION OF KINETIC BEHAVIOR DOWN TO 8 SECONDS FOR HEAVY IONS. HIGH TIME RESOLUTION IS IMPERATIVE FOR IMPROVING OUR UNDERSTANDING OF HEATING AND ACCELERATION MECHANISMS IN THE HELIOSPHERE. SPICES WILL EMPLOY NEW TECHNOLOGY TO ACCELERATE LOW CHARGE IONS UP TO ENERGIES MEASUREABLE BY CONVENTIONAL SSDS. IT WILL ALLOW VELOCITY DISTRIBUTION FUNCTIONS (VDF) TO BE MEASURED FOR A WIDE RANGE OF IONS PROVIDING INSIGHT ON ACCELERATION MECHANISMS AND SOURCES OF PLASMA IN THE HELIOSPHERE. THIS NEW DETECTION CAPABILITY WILL BE ENABLED BY IN-SENSOR PARTICLE ACCELERATION PROVIDED BY A NOVEL HIGH VOLTAGE POWER SUPPLY (HVPS) THAT FOLLOWS A PICASSO DEVELOPMENT GRANT TO DEVELOP A -100 KV HVPS. SPICES RELYING ON FLIGHT-PROVEN HERITAGE DELIVERS CHARGE (Q) (1Q30) MASS (M) (1M 60) AND TOTAL ENERGY (E) FOR (1) THERMAL SOLAR WIND PROTONS AND ALPHAS (2) HEAVY IONS (3) PICKUP IONS AND (4) SUPRATHERMAL TAIL IONS OVER THE REGIME IN WHICH THERMAL IONS ARE HEATED INTO SUPRATHERMAL IONS FORMING THE SOURCE POPULATION FOR ENERGETIC PARTICLES. WITH ITS WIDE FOV SPICES WILL MEASURE THE VDF OF PARTICLES RANGING FROM HE+ THROUGH FE20+ AT THERMAL AND SUPRATHERMAL ENERGIES. SPICES USES A SUBSET OF THE ORIGINALLY PROPOSED MODULAR DESIGN OPTIMIZED TO SIMULTANEOUSLY AND UNAMBIGUOUSLY MEASURE ALPHAS AND HEAVY IONS FROM 0.5 130 KEV/E. THIS MODULAR DESIGN HAS MAXIMUM FLEXIBILITY FOR APPLICATION TO FUTURE MISSIONS.

$400,000FY2020National Aeronautics and Space AdministrationNASA

Regents Of The University Of Michigan

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