Paper | Title | Page |
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THPS076 | Sub-mm Therapeutic Carbon-Ion Irradiation Port in Gunma University | 3607 |
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Funding: This Study was done by Grant-in-Aid for Scientific Research (KAKENHI). One of advantage of particle therapy is concentration of irradiation dose. In April 2011, we developed "in-body-focusing type" irradiation port for "Proof-of-Principle" . This sub-mm port produces 1mm(1σ) beam. we will explain this irradion port at the conference. |
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THPS039 | Diffusion of a Circulating Beam by the RF-Knockout with a Spectrum including Many Bands | 3508 |
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The fast control of beam spill extracted from a synchrotron is a key function for the spot scanning irradiation in cancer therapy application. The authors have proposed the extraction method for the application which uses the control of a quadruple field of fast response as well as the RFKO (QAR method). The RF signal for the RFKO should cover a frequency band corresponding to a tune spread. A simulation with continuous RFKO operation, however, showed a spill intensity changes with time largely with only this band. The large change of spill is due to not uniform diffusion of circulating beam and it makes a constant spill difficult in the QAR method. A wider band gives a uniform spill, but it requires a larger Amp power. We proposed a spectrum including many bands around the resonances to reduce the power, since the bands outside around the resonances do not contribute to the diffusion. Such a spectrum has also an advantage to increase spill intensity for the QAR method, using a band so that the RFKO diffuses more inside particles of the separatrix but also it affects little them near the boundary. We can extract several times particles with a same shrink ratio of the separatrix. | ||