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P-window for short-range wakefield
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- set the basis order to be 0 (p=0).
Code Block FiniteElement: { Order: 0 //p=0 outside of the window CurvedSurfaces: on }
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- set an automatic moving window that following with the beam
Code Block PRegion: { Type: AutomaticMovingWindow Order: 2 //inside the window, p=2 (basis function order) Back: 0.1 //back pudding is 0.1 beamsize Front: 1 //front pudding is full beamsize }
Gaussian beam going through a cavity
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- The first step is to provide beam information:
*Optional: Force analytical BeamBoundaryLoading (can be used if the beampipe is cylindrical). Not required. Default is OFF.Code Block LoadingInfo: { Bunch: { Type: Gaussian Sigma: 2e-3 //Sigma (RMS) size of the bunch Nsigmas: 5 //beam occupies the location from -5 sigma to +5 sigma, total of 10 sigmas Charge: 1. //charge } Symmetry factor: 4 //factor by which to reduce the charge to account for symmetry conditions (monopole on axis: use 4, dipole at X (or Y) offset: use 2 in connection with proper electric boundary conditions in one plane) StartPoint: 0. 0. 0. //StartPoint is the position where the beam enters the structure (typically at low Z values) Direction: 0. 0. 1. //Direction along which the bunch will move, at the speed of light (should be the direction of the normal of the face with BoundaryID) BoundaryID: 5 //The boundary ID (sidelist number from Cubit), specifies the boundary through which the bunch enters the structure (should be a flat surface, containing StartPoint) }
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Loading: {
Type: BeamBoundaryLoading
Analytical: on
// Specify the right-handed coordinate system with its Z-axis along the beamline ( CrossProduct(X, Y) = Z = Direction specified above)
Origin: 0.0 0.0 0.0
XDirection: 1.0 0.0 0.0 //this is the direction of the beam offset, if any
YDirection: 0.0 1.0 0.0
Beampipe radius: 0.04
Beam offset: 0 //offset in x-direction of the local 2D coordinate system (value needs to be consistent with StartPoint specified above)
}
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