1 DESIGN OF A SUPERCONDUCTING ISOCHRONOUS CYCLOTRON FOR
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1 DESIGN OF A SUPERCONDUCTING ISOCHRONOUS CYCLOTRON FOR PROTON BEAM THERAPY Jacob Kelly jacob. kelly@cockcroft. ac. uk Cockcroft Institute University of Manchester 13 th December 2017 First cyclotron, Ernest Lawrence, 1930, University of California
2 Overview • Project description • Cyclotron theory • Current medical cyclotrons • Specifications of new medical cyclotron • Current work
3 Project description • Design a cyclotron and beam delivery system appropriate to Clatterbridge’s clinical requirements. • This will be done through work at • Cockcroft Institute (working on cyclotron and beam delivery design) • Clatterbridge Cancer Centre (developing a clinical specification) • Antaya Science and Technology (working on cyclotron design)
4 Cyclotron theory B in/out of screen Dee 1 Dee 2 Ion injection Image from hyperphysics website Ion output Synchrocyclotron Isochronous cyclotron
5 Current medical cyclotrons Name Type Energy (Me. V) B-field (T) Diameter Mass (t) (m) IBA S 2 C 2 Synchrocyclotron 230 ~ 6. 5 2. 5 ~ 50 Varian Probeam Isochronous 250 <4 3. 1 ~ 90 Mevion S 250 Synchrocyclotron 250 ~9 1. 8 ~ 20 Clatterbridge 62 ~ 1. 8 IBA Isochronous Varian ~ 120 (iron poles) Mevion
6 Specifications of new cyclotron Energy (Me. V) Range (cm) 60 3. 1 70 4. 0 230 32. 7 250 37. 7 Data from NIST Eye diameter ~ 2. 4 cm Diameter of the poles of a 70 Me. V cyclotron ~ 21 cm
7 Current work • Create a classical cyclotron field (homogenous) in Radia. ~ 4. 5 T • Perform simple particle tracking in this field. • Progress to designing the field maps associated with an isochronous cyclotron.
8 Summary • The proposed cyclotron will output 70 Me. V protons • Isochronous • Superconducting with average field of 4. 5 T • Compact with pole diameter ~ 21 cm
