Particle Detectors
EPAM
The Electron, Proton, and Alpha Monitor (EPAM) on the Advanced Composition Explorer (ACE) 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 cm2 sr), two Low Energy Magnetic Spectrometers (LEMS) measure the flux and direction of ions greater than 50 keV (geometry factor = 0.48 cm2 sr), and the Composition Aperture (CA) measures the elemental composition of the ions (geometry factor = 0.24 cm2 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. EPAM was designed and developed by ther Johns Hopkins Applied Physics Laboratory. See: http://sd-www.jhuapl.edu/ACE/EPAM/ Group: Instrument_Details Entry_ID: EPAM Group: Instrument_Identification Instrument_Category: Solar/Space Observing Instruments Instrument_Class: Particle Detectors Short_Name: EPAM Long_Name: Electron, Proton, and Alpha Monitor End_Group Group: Instrument_Associated_Sensors Short_Name: CA Short_Name: LEMS Short_Name: LEFS End_Group Group: Associated_Platforms Short_Name: ACE End_Group Online_Resource: http://sd-www.jhuapl.edu/ACE/EPAM/ Sample_Image: http://sd-www.jhuapl.edu/ACE/EPAM/pics/epam_image.jpg Group: Instrument_Logistics Data_Rate: 0.16 kpbs Instrument_Start_Date: 1997-08-25 Instrument_Owner: Johns Hopkins University, Applied Physics Lab End_Group End_Group