Electron, Proton, and Alpha Monitor
(EPAM)
for the Advanced Composition Explorer (ACE)
The Electron, Proton, and Alpha Monitor (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 = 0.48 cm ² sr each), two Low Energy Magnetic
Spectrometers (LEFS) measure the flux and direction of ions
greater than 50 keV (geometry factor = 0.48 cm ² sr each), 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.
A cross section of the EPAM telescope is shown here.
EPAM photo 25 KB JPEG
The EPAM instrument is the flight spare of the HI-SCALE instrument from
the ULYSSES mission. It was built by:
- The Applied Physics Laboratory, Johns Hopkins University
- The EPAM Co-I's are:
- Dr. Robert Gold (APL/JHU)
- Dr. S. M. Krimigis (APL/JHU)
Johns Hopkins University Applied Physics Laboratory ACE/EPAM web page
Return to ACE Home Page
Author and Curator: Eric R.
Christian (erc@cosmicra.gsfc.nasa.gov)
Responsible NASA Official: Tycho von Rosenvinge
(tycho@lheamail.gsfc.nasa.gov)
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Laboratory for High Energy Astrophysics (LHEA) at
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GSFC
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This file was last modified on
Thursday, 15-Feb-2001 11:50:24 EST
EPAM photo 25 KB JPEG