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&CELL: methods


potential_function

Garfield classifies chambers according to the number and orientation of planes, the presence of periodicities and the location of the wires as one of the following types:

Potential Use
A Non-periodic cells with at most 1 x- and 1 y-plane
B1X x-Periodic cells without x-planes and at most 1 y-plane
B1Y y-Periodic cells without y-planes and at most 1 x-plane
B2X Cells with 2 x-planes and at at most 1 y-plane
B2Y Cells with 2 y-planes and at at most 1 x-plane
C1 Doubly periodic cells without planes
C2X Doubly periodic cells with x-planes
C2Y Doubly periodic cells with y-planes
C3 Doubly periodic cells with x- and y-planes
D1 Round tubes without axial periodicity
D2 Round tubes with axial periodicity
D3 Polygonal tubes without axial periodicity
D4 Polygonal tubes with axial periodicity
MAP Field maps

Each chamber type has its own potential function. For numerical purposes, nearly all potential functions are further subdivided into a set of domains according to the aspect ratio of the periodicties, the distance between wires and planes etc.

Furthermore, versions of most potential functions exist which have been written so as to take advantage of vector hardware.

One can use the GET_CELL_DATA to find out which potential function is in use. The cell type is also displayed in response to the CELL-PRINT option and the PRINT-CELL command.


coordinate_system

Cells are described using one of the following 3 coordinate systems:

Coordinate system Use
Cartesian Cells described in (x,y) coordinates, field maps
Polar Cells described in (r,phi) coordinates
Tube Cells which contain a TUBE

One can use the GET_CELL_DATA to find out which system is in use.

Additional information on:
   
 


shape_function

For information on shape functions, see:

A. R. Mitchel and R. Wait, The finite element method in partial differential equations, Wiley (1977), in particular pp 108-110.


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Formatted on 0108-03- at 04:26.