ZGOUBI USERS' GUIDE - HEP

4.3 Declaration of options 63:£¨ ¢¤'§®w® ÉÉŠ!!²!^$^!^ËSYNRAD: Synchrotron radiation spectral-angular densitiesThe keyword SYNRAD enables (or disables) the calculation of synchrotron radiation (SR) electric field and spectralangular energy density. It must be preceded by PARTICUL for defining mass and charge values, as they enter in thedefinition of SR parameters.SYNRAD is supposed to appear a first time at the location where SR calculations should start, with the first data KSRset to 1. It results in on-line storage of the electric field vector and other relevant quantities in zgoubi.sre, as step by stepintegration proceeds. The observer (§ position , , ) is specified next to KSR.Data stored in zgoubi.sre:( ¢ ¨ Ä, ¢ ¨­ , ¢ ¨1 ): electric field vector © (eq. 3.2.1)particle velocity pqŠÄ " m" particle acceleration (eq. 3.2.3)¯® " ~" Äobserver time increment (eq. 3.2.2):Kretarded (particle) time) ) , particle to observer vector (eq. 3.2.4)"/ m"/ F° 1 Ä"m" particle coordinatesÄstep size in the magnet (fig. 2)· step numberparticle number¢ ¤ tagging letter¤ stop flag (see section 4.6.8)¤SYNRAD is supposed to appear a second time at the location where SR calculations should stop, with KSR set to 2.(eq. 3.2.11) as calculated from the FourierTIt results in the output of the ±³² S ô%^angular 7energy densitytransform of the electric field (eq. 3.2.11). The spectral range of interest and frequency sampling ( , , £ ) are specified> Ë Ënext to KSR.Note that KSR = 0 followed by a dummy line of data allows temporary inhibition of SR procedures.