SPOTBEAM¶

The SPOTBEAM card is used in conjunction with SPOTDIR, SPOTPOS SPOTTIME and SPOTTRAN to define multiple beam spots. A new primary is created randomly in any of the listed beam spots according to their respective weight or in sequential order. See SPECSOUR SPECSOUR.

Warning : These five cards are activated by indicating SDUM = BEAMSPOT in the SPECSOUR card. Barring this, the spot cards will be discarded.

See also SPOTDIR, SPOTPOS, SPOTTIME, SPOTTRAN

WHAT(1) ≠ 0.0:: particle id (Paprop) or A + 1000 Z + 100000 m for heavy ion beams
= 0.0:: particle id as per BEAM card
= -99999:: special code for printout (see |WHAT(6)|)
Default: = 0.0 (particle id as per BEAM card)
WHAT(2) > 0.0:: beam laboratory momentum (GeV/c) (total, not per nucleon!)
< 0.0:: |WHAT(2)| beam laboratory kinetic energy/n (GeV/n)
= 0.0:: beam momentum as per BEAM card
Default: = 0.0 (beam momentum as per BEAM card)
WHAT(3) ≥ 0.0:: beam spot weight (number of particles)
< 0.0:: stops the code
Default: no default
WHAT(4) > 0.0:: rectangular (total) momentum spread (GeV/c)
< 0.0:: Gaussian (total) momentum spread. |WHAT(4)| is the FWHM (GeV/c)
= 0.0:: no momentum spread
Default: = 0.0
WHAT(5) > 0.0:: rectangular angular X divergence of the beam (mrad)
< 0.0:: Gaussian angular X divergence of the beam. |WHAT(5)| is the FWHM (mrad)
= 0.0:: the beam has no angular X divergence
Default: = 0.0
WHAT(6) > 0.0:: rectangular angular Y divergence of the beam (mrad)
< 0.0:: Gaussian angular Y divergence of the beam. |WHAT(6)| is the FWHM (mrad)
= 0.0:: the beam has no Y angular divergence
Default: = WHAT(5)
SDUM: beam spot number (free format)
Default: \(n+1\) where \(n\) is the number of last previously defined spot

In the special case WHAT(1)=-99999, WHAT(2–5) are ignored and:

WHAT(6) > 0.0:: (all) beam spot infos are printed on the output
< 0.0:: resets to default (no printout)
= 0.0:: ignored
Default: = -1.0: no printout