Automated Control System for Smith–Garren Curves Measurement

Abstract

Smith–Garren (SG) curve is dependence of beam current on main coil’s current for different radii in an isochronous cyclotron. SG curves are used for calculation of phase motion of accelerated particles in absolute and relative values followed by calculation of phase-energy integral. The results of beam dynamics calculations are used for correction of mean magnetic field to isochronous one with accuracy better than $$ \pm 3{\kern 1pt} ~\,\left( {\text{G}} \right)$$ followed by the detection of an optimal value of main coil’s current, and for calculation of extraction efficiency of accelerated beam.