Title :
A non-resonant RF cavity loaded with amorphous alloy for proton cancer therapy
Author :
Makita, Y. ; Harada, H. ; Nayayama, T. ; Tsuchidate, H. ; Tsukishima, C. ; Yoshida, K.
Author_Institution :
Mitsubishi Electr. Corp., Hyogo, Japan
Abstract :
A non-resonant RF cavity loaded with amorphous alloy cores has been designed and tested. The cavity has a re-entrant structure loaded with 8 amorphous alloy toroidal core and its characteristic impedance is designed as 450 Ω. The RF power is fed by 1 kW solid state amplifier using a step-up transformer with 1:9 impedance ratio. In the high power test, an accelerating gap voltage of more than 900 V was measured with input power of 1 kW in the frequency range of 1 to 10 MHz. The voltage standing wave ratio (VSWR) was less than 2.0. The results prove that the cavity may be used successfully within a compact proton synchrotron for a cancer therapy facility
Keywords :
amorphous state; biomedical equipment; cancer; proton effects; radiation therapy; 1 kW; 1 to 10 MHz; 450 ohm; 900 V; amorphous alloy toroidal core; amorphous alloy-loaded cavity; characteristic impedance; compact proton synchrotron; high power test; impedance ratio; medical instrumentation; nonresonant RF cavity; proton cancer therapy; radiotherapy; re-entrant structure; step-up transformer; voltage standing wave ratio; Amorphous materials; Impedance; Life estimation; Power amplifiers; Protons; Radio frequency; Radiofrequency amplifiers; Solid state circuits; Testing; Transformer cores;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.795376
