Abstract: A system for substantially eliminating undesirable temperature transients and spacial gradients in the laser gas flow through a laser cavity having a large system heat exchanger positioned upstream of the cavity which provides an exit gas temperature T.sub.i approximately 5 degrees above the desired cavity inlet temperature wherein the large heat exchanger has a time dependent tolerance of .+-.5 degrees. A trimmer heat exchanger is positioned between the large heat exchanger and the cavity. A flow of saturated liquid coolant through the trimmer heat exchanger from a tank is provided by a constant displacement pump, with the flow rate of the coolant set to remove a maximum heat load corresponding to a 10 degrees temperature drop in the gas flow through the trimmer heat exchanger. The saturated liquid temperature and pressure of the liquid in the tank is adjusted to the desired level by controlling the pressure in the tank with an absolute pressure regulator.

Abstract: A high pressure hydrazine gas generator having a decomposition chamber which contains therein an initiator of I.sub.2 O.sub.5 crystals and a plurality of heat retaining balls. The liquid hydrazine which is initially introduced into the decomposition chamber, ignites upon contact with the initiator and creates a high temperature within the decomposition chamber. This high temperature is maintained within the chamber by the heat retaining balls and therefore sustains decomposition of the liquid hydrazine into gases which are emitted from the generator under extremely high pressure.