ZGOUBI USERS' GUIDE - HEP

96 4 DESCRIPTION OF THE AVAILABLE PROCEDURESELREVOL: 1-D uniform mesh electric field mapELREVOL reads a 1-D axial field map from a storage data file, whose content must fit the following FORTRAN readingsequenceOPEN (UNIT = NL, FILE = FNAME, STATUS = ‘OLD’ [,FORM=’UNFORMATTED’])DO 1 I=1, IXIF (BINARY) THENREAD(NL) X(I), EX(I)ELSEREAD(NL,*) X(I), EX(I)ENDIF1 CONTINUE¤§ where is the number of nodes along the § (symmetry) § -axis,component of the field. §¢is normalized with ENORM prior to ray-tracing. As well the longitudinal coordinate X isnormalized with a XNORM coefficient (usefull to convert to centimeters, the working units in zgoubi .¤ their coordinates, and ¢ §¤ the values of the §along a particle trajectory are calculated by means of a 5-points polynomial fit followed by second order off-axis Taylorseries extrapolation (see sections 1.5.1 and 1.6).§ -cylindrical symmetry is assumed, resulting in ¢ and ¢ taken to be zero on axis.§#"$Œ"[ and its derivatives¢Entrance and/or exit integration boundaries may be defined in the same way as in CARTEMES by means of the flag ¤ Oand coefficients ´ , ¡ , ² , ´ ) , ¡ ) , ² ) .Use PARTICUL prior to ELREVOL, for the definition of particle mass and charge.