APL is the home of the Electron, Proton, and Alpha Monitor (EPAM) particle instrument, one of six sensors and three instruments in the Advanced Composition Explorer (ACE) mission.

EPAM is composed of five telescope apertures of three different types. Two Low Energy Foil Spectrometers (LEFS) measure the flux and direction of electrons above 30 keV (geometry factor = 0.397 cm^2 sr), two Low Energy Magnetic Spectrometers (LEMS) measure the flux and direction of ions greater than 50 keV (geometry factor = 0.48 cm^2 sr), and the Composition Aperture (CA) measures the elemental composition of the ions (geometry factor = 0.24 cm^2 sr). The telescopes use the spin of the spacecraft to sweep the full sky. Solid-state detectors are used to measure the energy and composition of the incoming particles.

	ACE Project - Instrument summaries and other ACE material @ GSFC		Investigator: Dr. R. Gold - the JHU Applied Physics Laboratory
	ACE Fact Sheet @ JHU/APL		Dr. D. Haggerty - The JHU Applied Physics Laboratory dennis.haggerty@jhuapl.edu
	ACE Instrument Development and Science Center @ Caltech
	ACE Instruments: EPAM, JHU/APL CRIS & SIS, Caltech MAG SEPICA SWEPAM SWICS SWIMS ULEIS, JHU/APL & UMD
	ACE Mission Operations Center @ GSFC
	The JHU/APL Space Department
	The JHU/APL EPAM data page
	EPAM bibliography

Last Updated on Aug 20, 2015