Arc Discharge Suppression via Temporal Feature Analysis
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Solution Overview
Problem
Plasma processes face disruptions due to arc discharges, which can lead to substrate or target destruction, and existing countermeasures are inadequate in distinguishing between short and hard arcs, leading to potential escalation of minor arcs into destructive events.
Innovation Solution
A method and device that monitor plasma process parameters to determine the temporal features of countermeasures, such as interrupting or reversing the power supply, based on the interval since the last countermeasure, parameter development, and the behavior of previous countermeasures, to effectively suppress arc discharges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If countermeasures are applied to suppress all arc discharges, then hard arcs are suppressed, but short arcs are unnecessarily interrupted causing reduced productivity
Solution Approach 1:
The patent applies different countermeasure strategies to different types of arc discharges based on their local characteristics. Short arcs are allowed to self-extinguish without intervention, while hard arcs trigger active suppression countermeasures. This differentiated approach is achieved by monitoring arc duration and energy parameters to distinguish between arc types, thereby protecting productivity by not interrupting short arcs while maintaining reliability through suppression of hard arcs.
Solution Approach 2:
The patent changes the parameter of countermeasure application from uniform suppression to selective suppression based on arc characteristics. By monitoring parameters such as arc duration, voltage dip magnitude, and current increase rate, the system determines whether an arc is short or hard, and adjusts the countermeasure response accordingly. This parameter-based differentiation resolves the contradiction by adapting the suppression strategy to the specific arc type.
2Productivity
If countermeasures are delayed to allow short arcs to self-extinguish, then productivity is maintained, but hard arcs may escalate causing equipment damage
Solution Approach 1:
The patent implements preliminary action by establishing predetermined thresholds and criteria for distinguishing short arcs from hard arcs before the arcs cause damage. The system continuously monitors arc parameters and compares them against pre-set criteria for arc duration, energy release rate, and voltage dip characteristics. This preliminary classification enables the system to act appropriately - allowing short arcs to self-extinguish while triggering immediate suppression for hard arcs, thus maintaining productivity while preventing equipment damage.
Solution Approach 2:
The patent employs feedback mechanisms by continuously monitoring arc discharge parameters and using this information to determine the appropriate countermeasure response. The system measures arc duration, voltage changes, and current characteristics in real-time, feeds this information back to the control logic, and adjusts the suppression strategy accordingly. This closed-loop feedback ensures that short arcs are not unnecessarily interrupted while hard arcs receive timely suppression, resolving the contradiction between productivity and equipment protection.
3Measurement precision
If arc detection sensitivity is increased to detect all arcs, then hard arcs are reliably detected, but false detection of short arcs increases leading to unnecessary interruptions
Solution Approach 1:
The patent segments the arc detection and response process into distinct stages: arc detection, arc classification, and countermeasure decision-making. Instead of using a single sensitivity threshold that triggers suppression for all detected arcs, the system first detects arcs and then classifies them based on multiple parameters including duration, energy release rate, and voltage dip characteristics. This segmentation allows the system to maintain high detection sensitivity while reducing false positives by applying classification criteria that distinguish short arcs from hard arcs before triggering suppression countermeasures.
Solution Approach 2:
The patent applies dynamics by using time-dependent and parameter-dependent criteria for arc classification. Rather than static detection thresholds, the system evaluates arc characteristics dynamically over time, considering the evolution of voltage, current, and power parameters. The classification criteria adapt based on the arc's development stage and measured characteristics, enabling accurate distinction between short and hard arcs even with high detection sensitivity, thereby maintaining productivity by avoiding unnecessary interruptions.
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 allows for timely and targeted intervention in arc discharges, minimizing equipment damage and maintaining high throughput in plasma processes by differentiating between short and hard arcs and adjusting countermeasure durations accordingly.
Implementation Method 1
an arc discharge can be detected by detecting a dip or a decrease in voltage, or an increase in current
Implementation Method 2
a countermeasure for the suppression of arc discharges that interrupts or reverses a power supply to the plasma process in polarity
Data Source
AI summary
For suppressing arc discharges in a plasma process, a method includes monitoring of at least one parameter of the plasma process, determining a temporal feature of a first countermeasure and performing the first countermeasure. The temporal feature is determined as a function of, for example, at least one of an interval in time from at least one previous countermeasure, a development of the at least one parameter since a relevant time of introduction of the countermeasure, or since a variable period of time ahead of the relevant time of introduction of the countermeasure, and a differentiation as to whether a previous countermeasure was triggered based on the behavior of the at least one parameter, or based on the interval in time from at least one previous countermeasure.