hoses. The panels are constructed of aluminum honeycomb adhesively bonded to aluminum face sheets. The face sheets are coated on the outside with a thermal control coating, presently planned to be Z-93 white paint. Within the honeycomb, extruded aluminum tubes conduct coolant fluid from the inlet manifold on one side of the panels to the outlet on the opposite side. The maximum expected coolant temperature at the inlet is 445°K (340°F). Several types of fluid are under consideration as the heat transport means. Dual coolant paths provide reliability and full operational capability after one failure. The deployment mechanism is a cable-actuated scissors which extends the panels from a stowed layered position to the extended position as shown in Figs. 3, 4, and 11. The scissors mechanism also provides the structural support to maintain the radiator panels in position. The radiator together with its deployment mechanism is expected to have a mass of about 1350 kg (3000 lb). The total heat rejection assembly, complete with pumps, lines, and cold plate (for electronics thermal control) is expected to have a mass of about 1550 kg (3400 lb). More detailed information on the heat rejection system can be found in Ref. [4]. Electrical Equipment Assembly. The Electrical Equipment Assembly (EEA) contains a variety of electrical and electronic hardware and is mounted on a cold plate. For thermal control of this hardware, cooling fluid from the heat rejection assembly circulates through this cold plate. The EEA contains all of the controls for the SD power module. This includes pointing controllers which assure that the concentrator is pointed to within 0.1 degree of the sunline. These controllers drive both the beta and fine pointing gimbal actuators and are interfaced with alpha gimbal controls in the central portion of the manned base. Control of the PCU includes control for voltage and speed, startup and shutdown sequencing, and mass flow rate of the gas (power level). Control of the mass flow rate assures maintenance of proper temperatures in
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