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Emitter

Description

A boundary condition that models particle emission from a surface. Analyst supports two types of particle emission: primary emission, or particle initiation; and secondary emission, in which new particles are emitted as the result of impacts by previously emitted particles

Simulator Applicability

3D Multipacting(PT3p)

2D Multipacting(PT2p)

Common Uses

Simulation of particle interactions with surfaces. For further discussion, see Multipacting Applications.

Requirements

See Multipacting Attributes.

Limitations

See Multipacting Geometry.

Parameters

Label - A unique name that identifies the attribute. (IAttribute/Label)

Color - Color used on objects to which this attribute is applied. (IAttribute/Color)

Primary Emission/Model (IEmitter/PrimaryEmissionModel)

  • Simple - This boundary condition will be a surface particle source.

  • None - This boundary condition will not be a primary emitter.

Primary Emission/Number of Primary Emission Sites Per Face - The number of primary emission sites on the face of each mesh element in the emitter. (IEmitter/NumPrimaryEmissionSitesPerFace)

Primary Emission/Number of Primary Emissions Per Site - The number of primary particle emissions at each emission site. (IEmitter/PrimaryEmissionsPerSite)

Secondary Emission/Model (IEmitter/SecondaryEmissionModel)

  • Furman-Pivi (Copper) - This model defines secondary emission according to the parameters for copper as given in Furman and Pivi's original work on the subject.

  • Furman-Pivi (Stainless Steel) - This model defines secondary emission according to the parameters for stainless steel as given in Furman and Pivi's original work on the subject.

  • Parametric Yield Curve 1 - In this model, yield Y is a function of energy, E, according to Y(E) = Yp*C1*C1*(E/KMax)*exp(-C2*sqrt(E/KMax)), where you may define all parameters.

  • Parametric Yield Curve 2 - In this model, yield Y is a function of energy, E, according to Y(E) = Yp*S*(E/KMax)/(S-1+(E/KMax)^S), where you may define all parameters.

  • User (Piecewise Linear) - This model allows you to manually enter a piecewise linear function to define the relationship between impact energy and yield.

Secondary Emission/Maximum Number of Secondary Particles Per Impact - The number of secondary emissions for each particle impact. (IEmitter/NumSecondaryEmissionsPerImpact)

Secondary Emission/Yp (Yield Peak) - The peak value of the yield. (IEmitter/SEYieldCoeff_Form0_YieldPeak)

Secondary Emission/KMax (Impact Energy at Yield Peak) - [ENERGY] - Energy value at yield peak. (IEmitter/SEYieldCoeff_Form0_KMax)

Secondary Emission/C1 - Coefficient C1 in Y(E) = Yp*C1*C1*(E/KMax)*exp(-C2*sqrt(E/KMax)). (IEmitter/SEYieldCoeff_Form0_C1)

Secondary Emission/C2 - Coefficient C2 in Y(E) = Yp*C1*C1*(E/KMax)*exp(-C2*sqrt(E/KMax)). (IEmitter/SEYieldCoeff_Form0_C2)

Secondary Emission/S - Adjustable fitting parameter. Must be larger than 1. (IEmitter/SEYieldCoeff_Form1_S)

Secondary Emission/Piecewise Linear Points - A series of values to define the relationship of impact energy to particle yield. The list must contain an even number of values to describe pairs of data in the following format: e1, y1, e2, y2, and so on, where e1 and y1 define the first point on the curve. (IEmitter/PiecewiseLinearPoints)

Example Creation Script

Emitter_1 = AttributeSet_1.NewBoundaryCondition("Emitter", "Emitter_1")

Scripting Interfaces

“IEmitter”
“IAttribute”

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