Characteristics of fast beam switching for spot scanning
Characteristics of fast beam switching for spot scanning
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DOI：
10.1016/s0168-9002(03)01000-3
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发表时间：
2003-05
影响因子：
1.4
通讯作者：
T. Furukawa;K. Noda;E. Urakabe;M. Muramatsu;M. Kanazawa;Maeda Kazunao
中科院分区：
文献类型：
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作者：
T. Furukawa;K. Noda;E. Urakabe;M. Muramatsu;M. Kanazawa;Maeda Kazunao
为了对不规则形状的目标也能提供精确的辐照，提出了一种点阵扫描的辐照方法。在点扫描照射中，光束被关闭，而光束位置被转移到下一个点，以进行精确的剂量管理。近年来，在千叶同步加速器的重离子医用加速器上，提出了一种能达到50μs左右截止时间的快束截止方法，并进行了验证。为了利用该技术的这种特性进行点扫描，研究了在单个平顶中多次打开/关闭横向和纵向射频场时的快速波束开关特性。结果表明，在同步加速器工作模式中，该技术在单个平顶中提供了50多个光斑，截止时间为50μs。随着开关数的增加，动量扩散和提取光束的尺寸在实际使用的允许范围内增加。
An irradiation method for spot scanning has been developed in order to provide accurate irradiation even for an irregular target shape. In spot scanning irradiation, the beam is turned off while the beam position is shifted to the next spot for precise dose management. Recently, the fast beam cut-off method, which can achieve a cut-off time of around 50μs, was proposed and verified at the Heavy Ion Medical Accelerator in Chiba synchrotron. In order to utilize such a speciality of the technique for spot scanning, the characteristics of fast beam switching were investigated while turning on/off both the transverse and longitudinal RF fields many times during a single flattop. As a result, it was verified that this technique provides more than 50 spots during a single flattop in the synchrotron operation pattern with a cut-off time of 50μs. With an increase in a switching number, the momentum spread and the size of the extracted beam increase within the allowable range for practical usage.