ZGOUBI USERS' GUIDE - HEP

124 4 DESCRIPTION OF THE AVAILABLE PROCEDURES¥b7b7bFOCALE: § §„¨IMAGE[S]: § w27Mfb7Vq f2£ w ¨ bMb 2bMf¤ôS«>bFOCALE, IMAGE[S]: Particle coordinates and beam size; localization and size of horizontal waistFOCALE calculates the dimensions of the beam and its mean transverse position, at a longitudinal distance § ¨ from theposition corresponding to the keyword FOCALE.IMAGE computes the location and size of the closest horizontal waist.IMAGES has the same effect as IMAGE, but, in addition, for a non-monochromatic beam it calculates as many waists asthere are distinct momenta in the beam, provided that the object has been defined with a classification of momenta (seeOBJET, KOBJ = 1, 2 for instance).Optionally, for each of these three procedures, zgoubi can list a trace of the coordinates in § the ,planes.and in the , The following quantities are calculated for £ the(IMAGES)particles of the beam (IMAGE, FOCALE) or of each group of momentaLongitudinal position:® b w ¨ ` MbEc 7V ` MbDc 7 ® b` MbDc 7« e£e£ǸMbDc 7 ® > b w ¨ `#MbDc 7 ® b where and are the coordinates of the first particle of the beam (IMAGE, FOCALE) or the first particle ofeach group of momenta (IMAGES). §nV tgTransverse position of the center of mass of the waist (IMAGE[S]) or of the beam (FOCALE), with respect to thereference trajectoryb wq£ q£b § tg2 bbDc 7bDc 7 FWHM of the image (IMAGE[S]) or of the beam (FOCALE), and total width, respectively, % and %>b w 2% @ B U¦N2 >bEc 7 (*)-% ©¨ ¡ °FOCALEZ, IMAGE[S]Z: Particle coordinates and beam size; localization and size of vertical waistSimilar to FOCALE and IMAGE[S], but the calculations are performed with respect to the vertical coordinates, in place of and .and