医用质子加速器注入器7 MeV漂移管直线加速器的设计
Design of 7 MeV drift tube linac as injector of proton accelerator for cancer therapy
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摘要: 针对质子治癌直线加速器功耗少、长度短的要求，设计了一台工作频率为324 MHz的漂移管型质子直线加速器(DTL)。该DTL把粒子从2.5 MeV加速到7 MeV，功耗为265 kW, 总长1.9 m。横向聚焦采用FODO结构，漂移管内放置永磁铁。提出一种新的束流匹配方案，在射频四极场加速器(RFQ)与DTL之间不设束运线，而是以 DTL入口处的4个单元为匹配段，把RFQ出口处相椭圆匹配到DTL周期结构入口处的相椭圆。 用PARMILA程序对该DTL进行了动力学模拟，结果表明该方案的束流发射度增长很小。Abstract: A 324 MHz drift-tube linac(DTL) is designed for proton cancer therapy. The design demands low power dissipation and short tank. The DTL accelerates beam from 2.5 MeV to 7 MeV, with RF power of 265 kW and total length of 1.9 m. The DTL uses permanent-quadrupole magnet(PQM) inside the drift tubes arranged in an FODO lattice. A new matching method is designed. In stead of the traditional beam transport line, the first four cells in DTL are designed as matching section. It causes the beam ellipse from radio-frequency quadrupole linac(RFQ) to satisfy conditions specified by the DTL periodic structure. The dynamics simulation was performed with PARMILA, and almost no emittance growth has been found.
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Key words:
- proton cancer therapy /
- drift-tube linac /
- match /
- error analysis
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