Charge Energy Mass Spectrometer
The CHarge Energy Mass Spectrometer (CHEMS), provided by the University of
Maryland, measures the charge state, compostion, and energy of ions with energies
between about 10 to 220 keV/charge. It uses electrostatic deflection followed by
time-of-flight (TOF) and solid state detector (SSD) energy measurments to sort
the incoming events by their characteristics. The CHEMS head has a +/- 80 deg.
by 8 deg. (4 deg. full width at half maximum) field of view( FOV). The +/- 80
deg. direction of the FOV is segmented into 3 distinct measurment directions.
CHEMS is mounted on the Fields-and-Particles Pallet, with the center of its FOV
viewing in the -X direction (see Spacecraft
Diagram and Spacecraft Photo for the position of the
Pallet on the Spacecraft).
CHEMS has a mass of 6.66 kg and consumes about 3.5 W of nominal power. Its volume
envelope is about XXX by YYY by ZZZ cm.