IH LINAC WITH HIGHER ORDER MODES
IH LINAC WITH HIGHER ORDER MODES
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发表时间：
2008
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通讯作者：
N. Hayashizaki;T. Hattori
中科院分区：
文献类型：
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作者：
N. Hayashizaki;T. Hattori
作为漂移管型直线加速器的一种，叉指H（IH）直线加速器已被用于低β区离子加速。它可以在低频段实现一个合适尺寸的谐振腔，在低能量范围内实现较高的并联阻抗。这些特性特别有利于重离子加速，因此，该结构已被应用于重离子癌症治疗。虽然电场是由TE 111模式谐振的，但在没有漂移管的圆柱形腔中，它不具有轴向分量。加速场采用叉指形漂移管激发。为了将这种结构应用于中高能区，我们提出了一种具有高阶模（HOM）的TE 11n模的IH直线加速器。由于HOM的存在，加速器的工作频率变高，这一特性适合于中高能离子束的加速。给出了腔体结构的设计方法和可能性。
As one of the drift tube type of linacs (DTL), an Interdigital-H (IH) linac has been used for ion acceleration in low beta range. It can realize a resonant cavity of convenient size at low frequencies band and higher shunt impedance at low energy range. These characteristics are advantageous especially for heavy ion acceleration; therefore, this structure has been applied for heavy ion cancer therapy. Although the electric field is resonated by the TE111 mode, it does not have the axial component in the cylindrical cavity without drift tubes. The accelerating field is excited by using the drift tubes of Interdigital shape. To apply this structure to middle and high energy range, we propose a IH linac with the TE11n mode of the higher order mode (HOM). The operating frequency becomes higher due to HOM, and this property is suitable to accelerate ion beam of middle and high energy. The design of the cavity structure and the possibility are presented.