TRIUMF Cyclotron Research Articles

COMA - A Linear Motion Code for Cyclotrons

COMA, a computer program written in FORTRAN IV, accurately calculates the relative motion of up to 5000 particles over the complete energy range of the TRIUMF cyclotron at a cost about 1% of our numerical integration codes. In addition it can simulate the action of diagnostic probes and slits. COMA uses linear transformation matrices, obtained from an equilibrium orbit code, that include coupling between radial and longitudinal motion. The energy gain and vertical focusing forces at the dee gap are given by an improved analytical model.

Construction Details of the TRIUMF H- Cyclotron

The TRIUMF cyclotron includes seven major components requiring large industrial contracts: the magnet cores, coils, D. C. power supply, vacuum chamber, support structure, RF resonators and RF power supply. The first five components are discussed, together with actual performance data. The RF components have been described recentlyl and will be installed in the cyclotron in about two months. The costs of these components plus associated building, engineering and inspection fees are given.

Some Orbit Calculations for TRIUMF

This paper is a report of some studies made of orbit properties in the TRIUMF Cyclotron. We will describe a numerical technique for obtaining solutions of ill-conditioned linear equations, this has proved useful when trying to produce a desired field with 54 trim coil pairs using the method of least squares, and in calculating an isochronous field. We will also describe a phase dependent centring error which can distort the horizontal emittance of beams with positive phases, thus limiting the phase acceptance of a cyclotron; and tolerances for field imperfections imposed by certain resonances in TRIUMF will also be reported. These calculations are chiefly concerned with phenomena away from the immediate central region and consequently electric focusing forces have been ignored. Central region calculations that include electric fields will be reported elsewhere.