&CELL: ROWS


CARTESIAN

  States that the wires will be entered in Cartesian coordinates,
  (x,y).

  This keyword need not be specified if the cell is already
  established to be in Cartesian coordinates, for instance if
  a plane at constant x has already been entered. This keyword
  is not valid if the cell is already established to be in
  polar or in tube coordinates.

  When Cartesian coordinates are used, you may enter planes at
  constant x and at constant y. Also both x and y periodicities
  are permitted.

  [If no coordinate system has yet been established when ROW is
  entered, then Cartesian coordinates are assumed by default.]

POLAR

  States that the wires will be entered in polar coordinates (r,phi)
  with r in cm and phi in degrees. When using polar coordinates, you
  must ensure that no wire is located at r=0. If you need to describe
  a cell which has a wire at the center of a round plane, then TUBE
  should be used.

  When the wires are listed in polar coordinates, the planes have to
  be entered in polar coordinates too. That is, the planes can be
  at constant r or at constant phi.

  Periodicity in phi is permitted, but radial periodicity isn't.

  These coordinates are transformed to an internal coordinates system
  which is a conformal map of a Cartesian system - but all frequently
  used instructions transform these internal coordinates back to
  polar coordinates when outputting the results.

  This keyword need not be specified if the cell is already
  established to be in polar coordinates, for instance if
  a phi periodicity has already been entered. This keyword
  is not valid if the cell is already established to be in
  Cartesian coordinates or in tube coordinates.

  [If no coordinate system has been established yet when the
  ROWS command is entered, then Cartesian coordinates will be
  assumed by default.]

TUBE

  TUBE is a special coordinate system, halfway in between Cartesian and
  polar. Tubes are used to describe for instance a wire running in the
  middle of a round plane.

  The tube itself and the phi periodicity, if any, is specified in polar
  coordinates, but the wires are listed in Cartesian coordinates.

  Like for polar coordinates, a coordinate transformation is applied to
  the wire location but the internal coordinates never appear on output.

  This keyword need not be specified if the cell is already
  established to be in tube coordinates because a TUBE statement
  has already been entered. This keyword is not valid if the cell
  is already established to be in Cartesian or polar coordinates.

  [If no coordinate system has been established yet when the
  ROWS command is entered, then Cartesian coordinates will be
  assumed by default.]

code

  A single character identifying the wires in the row. You may give more
  characters but only the first is relevant. These codes are used later
  on to single out (groups of) wires that are in some way special. It's
  worthwhile to choose the wire-codes well !

n

  The number of wires in the row, this may be a symbolic expression in
  terms of previously DEFINEd variables.

  [Default: 1, i.e. a single wire].

diameter

  The diameter of the wires in the row. This may be a symbolic
  expression in terms of previously DEFINEd variables and you may use
  the loop variable I in the expression if you wish.

  [Default: 0.01 cm, i.e. 100 micron].

x_wire

  The x- or r-position of the wires in the row, this may be a
  symbolic expression in terms of previously defined variables.

  The loop variable I can be used to construct symbolic expressions
  for the locations of the wires in the row. For instance, for a
  series of wires with coordinates 1, 2, 3 and 4 you could enter
  the expression 1+I.

  [Default: 0 cm.]

y_wire

  The y- or phi-position of the wires in the row, this may be a
  symbolic expression in terms of previously defined variables.

  The loop variable I can be used to construct symbolic expressions
  for the locations of the wires in the row. For instance, for a
  series of wires with coordinates 1, 4, 9 and 16 you could enter
  the expression (I+1)**2.

  [Default: 0 cm, phi should be in degrees.]

V_wire

  The potential of the wires in the row, this may be a symbolic
  expression in terms of previously defined variables.

  The loop variable I can be used to construct symbolic expressions
  for the potentials of the wires in the row. For instance, for a
  series of wires with potentials 1000, 1000, 2000 and 2000, you
  could enter the expression 1000+entier(i/2)*1000

  [Default: 0 cm.]

w_wire

  The weight used to stretch the wires. Used to compute the
  displacement of the wires under electrostatic forces.

  [Default: 50 grams.]

l_wire

  The length of the wires. Used to compute the displacement
  of the wires under electrostatic forces.

  [Default: 100 cm.]

density

  The density of the material of which these wires are made.
  Used to compute the displacement of the wire due to gravitational
  forces - not relevant if the wires are vertical.

  For copper-Beryllium wires, one can also enter CU-BE and for gold
  plated Tungsten one can type TUNGSTEN or W.

  [Default: 19.3 g/cm**3, i.e. 20 micron gold plated Tungsten wire]

increments

  In earlier versions of the program, rows with a constant spacing
  in the coordinates and the potential could be constructed using
  increments (the 7th, 8th and 9th word).

  This feature is much less powerful than the alternative method
  using the loop variable and the increments have therefore been
  suppressed as of version 5.

loop-variable

  The loop-variable is a variable, named I, the program defines for
  you and that takes on the value 0 for the first wire in the row,
  1 for the second and so forth.

  This variable may be used for the diameter, the position, the
  potential, the stretching weight and the length of the wire.

  The loop-variables can be used to construct non-standard electrode
  shapes using wires. Some examples are shown in the description of
  the wire position and voltage.

Keyword index. Formatted on 10/11/98.