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GICO uses symplectic coordinates with
mass and energy as coordinates for transfer matrices. Sometimes it
is desirable to see the Matrix based on mass and momentum instead, or
to compare the Matrix to results obtained from another program like
GIOS. The command that changes the coordinates is:
5 O(UTPUT) C(OORDINATES)
<coord1> <coord2>
<coord3> <coord4> ;
[example: O C N M L N ;]
[O C S E G ;]
coord1 can be S(YMPLECTIC) or N(ONSYMPLECTIC), switching between the
two different
definitions of a and b. coord2 can be E(NERGY) or M(OMENTUM).
coord3 can be G(ICO), which means time_difference x velocity,
T(IME) or L(ENGTH). coord4 can be N(ONSCALED) or S(CALED), and has
effect only, if coord3 is T(IME) or L(ENGTH). In this case, if
coord4 is S(CALED), the time or length elements of the matrix are
divided by the flight time or the travel distance of the reference
particle. To compare the transfer matrix to GIOS, use the
command O C N E T S. To compare the tranfer matrix to programs like
TRANSPORT or MIRKO, use the command O C N M L N.
Note that when using coordinates different from the default, some
commands (like Draw Beam etc.) may take more time than usual, because
the matrix has to be converted to the new coordinates very often.
Note also that in this case changing the coordinates in the middle of the
system causes error.
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KPII
1999-10-20