Patent ID: 7848840

Claim:
A method for adaptively controlling a process temperature during a plasma etch process, comprising: loading into a memory a first setpoint for a process temperature in a first recipe step and a second setpoint for the process temperature in a second recipe step; accessing a look up table to determine a first set of proportional-integral-derivative (PID) values for a PID controller to control the process temperature at the first setpoint; accessing the look up table to determine a second set of PID values for the PID controller to control the process temperature at the second setpoint, wherein at least one value of the PID values in the second set is different than those of the first set and wherein at least one of the first and second set of PID values is determined by accessing the look up table based on the process temperature setpoint of a recipe step, a heat exchanger or chiller setpoint temperature, and a temperature setpoint delta between setpoints of the process temperature in two consecutive recipe steps.