The paper discusses the engineering fixes that proved to be necessary to qualify the radiation cooler used earlier successfully on low-flying (650 km) Resource-01 series satellites for a geosynchronous environment. Laboratory testing and verification have been done using Magdus simulation facility capable of providing continuously a beam of 30 keV electrons (flux 10~(10)-10~(-7) A/cm~2). Grounding thermal shields (two-side aluminized Polyester films) and metallizing outer surfaces virtually eliminated electrostatic discharges which were responsible for electromagnetic interference pulses in the mock-up photoresistor circuit of up 0.3 A in the original radiation cooler. Also, it is argued that there are no additional types of electrostatic discharges except for punchthrough and flashover as opposed to the hypothesis of Meulenberg about bilayer (Maker) emission limited discharge due to the field enhanced secondary emission instability.
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