retuning the cd controller 64 with more conservative tuning parameters allows the controller to tolerate the misalignment and stabilizes the cd feedback system the identification component is preferably triggered automatically when picketing is detected subject to optional detuning 64 the identification process commences with prbs testing whereby experiment data are collected for the closed loop identification algorithm whenever a prbs test is completed based on the set up of the shrinkage option linear 68 parametric nonlinear 70 or nonparametric nonlinear 72 the corresponding closed loop alignment id identification algorithm is executed the identified alignment feeds in an alignment validation block 74 based on the model validation results good fair or poor the algorithm triggers online deployment the deployment component defines the logic of implementing the identified alignment based on the output of alignment validation block 74 in a preferred protocol if the identified alignment is rated as good the new alignment 78 is deployed and original more aggressive controller tuning parameters 80 is restored if the controller was detuned at the beginning of the prbs test if the identified alignment is rated as fair the new alignment 82 is also deployed but the controller still uses more conservative tuning parameters if the controller was detuned at the beginning of the prbs test finally if the identified alignment is rated as poor the new alignment is dropped for both the fair and poor cases prbs excitation parameters are redesigned 76 and another prbs test 66 is conducted as long as the maximum prbs test has not been reached before completing the process a detection and identification report 84 is provided the logic assures that after deploying the new alignment the overall closed loop cd performance will be.