EUV Laser Actuator Control Predictive Polling
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Solution Overview
Problem
Existing EUV light generation systems face inefficiencies due to overhead delays in actuator movement control, leading to displacement and delayed detection of movement completion, which affects the precision and timing of laser beam adjustments in the plasma generation process.
Innovation Solution
The EUV light generation control unit predicts the actuator's movement completion time and transmits a polling signal only after this time has expired, reducing overhead time and enabling immediate detection of actuator status, allowing for earlier initiation of subsequent control actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the controller transmits polling signals at fixed intervals to check actuator status, then the control system maintains simple timing logic, but overhead delays increase and movement completion detection is delayed
Solution Approach 1:
The controller performs preliminary calculation of the movement completion time based on the movement instruction parameters before the actuator actually completes its movement. This allows the controller to predict when the actuator will finish moving and schedule the polling signal transmission accordingly, eliminating unnecessary waiting time and reducing overhead delays in the control loop.
2Productivity
If the controller waits for actuator movement completion before initiating next control action, then control accuracy is maintained, but system productivity decreases due to sequential processing
Solution Approach 1:
The controller uses feedback from the actuator's status responses to polling signals to confirm actual movement completion. By calculating expected completion time and comparing it with actual actuator feedback, the system can accurately determine when movement is complete while maintaining high productivity through optimized timing of subsequent control actions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces overhead time, improving the precision and speed of laser beam adjustments, thereby enhancing the overall efficiency and accuracy of EUV light generation.
Implementation Method 1
a mirror (M1) configured to reflect a laser beam (L1)
Data Source
AI summary
A laser apparatus may include: a mirror configured to reflect a laser beam; an actuator configured to operate the mirror; and a controller configured to transmit a movement instruction to the actuator, wherein the controller predicts a movement completion time of the actuator, and transmits a polling signal so that the actuator receives the polling signal after expiration of the predicted movement completion time.