| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9817519 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2005 | 4 Pages |
Abstract
In cancer therapy using an ion beam, a scanning irradiation method has been developed in order to realize 3-D conformal irradiation. From studies of the scanning method, it has been required for a medical synchrotron to be capable of controlling the beam intensity during the duration of extraction. For this purpose, a beam-intensity control technique with RF-knockout slow-extraction has been studied and developed at the HIMAC synchrotron. Based on a simple one-dimensional model of extraction, the function of amplitude modulation (AM) for a transverse RF-field was analytically calculated to control the beam current. By cooperating with the feedback system, finally, we could control the beam intensity within a range of one order during a single flattop. We report on a simulation and the experiment result of intensity control for scanning irradiation.
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Authors
T. Furukawa, K. Noda, T.H. Uesugi, T. Naruse, S. Shibuya,