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defines the axes used for a beam reference frame different from the
geometry frame
See also BEAM, BEAMPOS, POLARIZAti, SOURCE, SPECSOUR
WHAT(1) = cosine of the angle between the x-axis of the beam reference frame and the x-axis of the geometry frame Default: no default
WHAT(2) = cosine of the angle between the x-axis of the beam reference frame and the y-axis of the geometry frame Default: no default
WHAT(3) = cosine of the angle between the x-axis of the beam reference frame and the z-axis of the geometry frame Default: no default
WHAT(4) = cosine of the angle between the z-axis of the beam reference frame and the x-axis of the geometry frame Default: no default
WHAT(5) = cosine of the angle between the z-axis of the beam reference frame and the y-axis of the geometry frame Default: no default
WHAT(6) = cosine of the angle between the z-axis of the beam reference frame and the z-axis of the geometry frame Default: no default
SDUM : not used Default (option BEAMAXES not requested): the beam frame coincides with the geometry frame
Notes:
Example:
* The next option cards describe a 10 GeV proton beam with a divergence of * 50 mrad and a gaussian profile in the "beam x"-direction and in the * "beam y"-direction described by standard deviations sigma_x = 1. cm * (FWHM = 2.36 cm) and sigma_y = 0.5 cm (FWHM = 1.18 cm). The beam starts * from point (0,0,0) and is directed in a direction perpendicular to the * "geometry x" axis, at 45 degrees with respect to both "geometry y" and * "geometry z". The "beam x" axis has cosines 1,0,0 and the "beam z" * axis has cosines 0, cos(pi/4), cos(pi/4) *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8 BEAM -10.0 0.0 50.0 -2.36 -1.18 1.0 PROTON BEAMPOS 0.0 0.0 0.0 0.0 0.7071068 0.0 BEAMAXES 1.0 0.0 0.0 0.0 0.7071068 0.7071068