DESAIN CENTRAL REGION SIKLOTRON PROTON 13 MeV; DESIGN OF CENTRAL REGION FOR 13 MeV PROTON CYCLOTRON

Emy Mulyani, Arief Hermanto

2013 | Disertasi | PROGRAM STUDI S-2 ILMU FISIKA

The central region is an important area on the cyclotron because it will determine the quality of the ion beam from the ion source to the stripper. Central region consists of ion source, puller, dee tips with dee support and guide beam. DECY 13 cyclotron using an internal ion source which produces H- ions in order to easier beam extraction using a carbon foil. Hole/slit of the ion sources is placed at x = 17.5 mm and y = 9 mm with a distance of 10 mm to the puller which is component for pulling the ion from ion source then pass it through the dee tips. Beam guide as a guide component for the ion beam in order to move in a circle and accelerated, this component is important because in this area the magnetic field strength and ion velocity are still weak. The simulation was performed using the distribution of magnetic field and electric fields in the area of 960 mm ? 960 mm ? 40 mm with mesh size of 7 mm and 6 mm respectively at 1 mm resolution. Dee voltage is set 40 kV at fourth harmonic RF frequency of 77.64 MHz, ? 37? to ? 53? initial phase and average magnetic field of 1.275 T. Simulation results show up to 90 turns of orbital trajectories, reaching about 13 MeV of beam energy (145 kV / turn) and 6 mm vertical movement. The distribution of accelerating electric field and magnetic field inside the cyclotron were calculated in 3 dimensions using Opera3D code and Tosca modules. The trajectory simulation was carried out using Scilab-5.4.1 code.

Kata Kunci : Siklotron; Central Region; Simulasi Lintasan; Opera3D Tosca; Scilab-5.4.1