A two-phase pump loop (TPPL, 1) for dissipating a thermal load during operation of an apparatus; the TPPL comprising: a vapor/liquid receiver configured to store a coolant; a pump configured to force the coolant to flow through the TPPL; an evaporator configured to absorb heat (Q ABSORBED) from the apparatus, the evaporator having an inlet and an outlet; a condenser configured to release heat (Q REJETED) in order to remove the heat (Q REJECTED) from the TPPL; characterized in that the TPPL further comprises: a valve (V 1,25) configured to regulate a pressure or temperature of the coolant exiting the evaporator; the V 1 having a control set point set at a first pressure (P 1set) to achieve an evaporator exit pressure that is a saturation pressure (P H) for the coolant at a predetermined exit temperature from the evaporator; a valve (V 2,30) having a control set point set at a second pressure (P 2set) to prevent the vapor/liquid receiver pressure from going to a pressure/temperature that is lower than a predetermined value (P L); and a controller configured to control the set points of V 1 and V 2; wherein the controller is configured to set P 1set so as to provide a predetermined temperature at the outlet of the evaporator and the controller is configured to vary P 2set so as to maintain the pressure in the vapor/liquid receiver at or above P L; wherein the TPPL is configured to cool the thermal load with tight control of the temperature of the coolant that is cooling the apparatus. a vapor/liquid receiver configured to store a coolant; a pump configured to force the coolant to flow through the TPPL; an evaporator configured to absorb heat (Q ABSORBED) from the apparatus, the evaporator having an inlet and an outlet; a condenser configured to release heat (Q REJETED) in order to remove the heat (Q REJECTED) from the TPPL; characterized in that the TPPL further comprises: a valve (V 1,25) configured to regulate a pressure or temperature of the coolant exiting the evaporator; the V 1 having a control set point set at a first pressure (P 1set) to achieve an evaporator exit pressure that is a saturation pressure (P H) for the coolant at a predetermined exit temperature from the evaporator; a valve (V 2,30) having a control set point set at a second pressure (P 2set) to prevent the vapor/liquid receiver pressure from going to a pressure/temperature that is lower than a predetermined value (P L); and a controller configured to control the set points of V 1 and V 2; wherein the controller is configured to set P 1set so as to provide a predetermined temperature at the outlet of the evaporator and the controller is configured to vary P 2set so as to maintain the pressure in the vapor/liquid receiver at or above P L; a valve (V 1,25) configured to regulate a pressure or temperature of the coolant exiting the evaporator; the V 1 having a control set point set at a first pressure (P 1set) to achieve an evaporator exit pressure that is a saturation pressure (P H) for the coolant at a predetermined exit temperature from the evaporator; a valve (V 2,30) having a control set point set at a second pressure (P 2set) to prevent the vapor/liquid receiver pressure from going to a pressure/temperature that is lower than a predetermined value (P L); and a controller configured to control the set points of V 1 and V 2; wherein the controller is configured to set P 1set so as to provide a predetermined temperature at the outlet of the evaporator and the controller is configured to vary P 2set so as to maintain the pressure in the vapor/liquid receiver at or above P L; wherein the TPPL is configured to cool the thermal load with tight control of the temperature of the coolant that is cooling the apparatus.