Patent ID: 6445146
Filing Date: 2002-09-03
Classification: H05H

Abstract:
A method for minimising the size of magnet poles of a cyclotron system for production of radioactive tracers comprising the steps of:selecting an operation mode having vz defined below the critical resonance value of vz=Â½; choosing then a valley technique having more shallow valleys instead of deep valleys by selecting a first magnet pole parameter defining a valley gap accepting a narrow spaced RF electrode system and facilitating a vacuum conductance necessary for obtaining low enough pressure suitable for acceleration of negative hydrogen ions, defining a second magnet pole parameter by setting a sector gap to the order 15-30 mm facilitating a vacuum conductance necessary for obtaining a low enough pressure suitable in an accelerator for negative hydrogen ions; increasing the magnetising field for transforming a magnetic azimuthal field shape from being â€œsquare-waveâ€  shaped to become approximately sinusodial; calculating from the increased magnetising field and the first and second magnet pole parameter an average magnet field; calculating from the average magnet field a third magnet pole parameter in the form of a pole diameter, thereby obtaining the most compact design of an electromagnet system for the cyclotron system.