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h-type structure
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  h型结构
     The CAE Analysis of H-type Structure and Second Development in Heat Exchanger with Longitudinal Flow of the Shellside Fluid
     纵流壳程换热器H型结构CAE分析及其二次开发
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The principle, structure, adjustment of the gap voltage, beam dynamic, RF system and the bunchers of the post-accelerator with Interdigital-H type structure, which was developed by the author and Technical University Munich in four years, is described. The energy of ions with mass of three was increased from 340keV to 1.74MeV, when resonant frequency of 84.2MHz and input RF power of 3kW. The effective shunt impedance reached to 408MΩ/m. The commissioning was succeeded with H + 3 ion beams. The...

The principle, structure, adjustment of the gap voltage, beam dynamic, RF system and the bunchers of the post-accelerator with Interdigital-H type structure, which was developed by the author and Technical University Munich in four years, is described. The energy of ions with mass of three was increased from 340keV to 1.74MeV, when resonant frequency of 84.2MHz and input RF power of 3kW. The effective shunt impedance reached to 408MΩ/m. The commissioning was succeeded with H + 3 ion beams. The output energy of H + 3 ion beams reached the design value. The two harmonic double drift buncher used by the IH structure bunches the beam to the bunches with the width of 360ps. Then the acceptance of the IH structure is increased to 240°. Its shunt impedance is three times higher than former single gap bunchers used by TUM and the length of the buncher system is one fifth of former one only because the use of λ/4 coaxial cavities with double gaps.

在 4年时间内和德国慕尼黑技术大学合作研制成一台Interdigital-H型加速结构 (以下简称IH型结构 )的射频直线后加速器[1] 。叙述了该加速器的原理和结构 ,间隙电压的调整 ,束流动力学 ,射频系统及聚束器。在 84 .2MHz的谐振频率下 ,输入 3kW射频功率 ,它可以把质量数为 3的离子的能量从 340keV提高到 1.74MeV ,有效分路阻抗高达 4 0 8MΩ/m。用H+ 3 束一次调试出束成功 ,输出H+ 3 离子的能量达到设计值。该后加速器采用的二谐波双漂移聚束器 ,把束流聚集成宽度为 36 0 ps的束团 ,使加速腔的接受度提高到 2 4 0°。由于采用了双间隙型λ/ 4同轴腔结构 ,分路阻抗是慕尼黑以前所用的单间隙型的 4倍 ,而聚束系统占用的束线长度缩短到 2 0 %。

The heavy ion linac in Lanzhou is designed as a future injector for the Cooling Storage Ring (CSR). In order to keep the total machine within 40 meters, the IH (Interdigital H-type) structure is adopted for its higher acceleration gradient compared with the traditional DTL structure. The designed minimum charge over mass ratio is 1/6, the output energy is 16MeV/u and the beam current is 1A·μA. The RFQ and the first DTL tank will work at 100MHz, and the other DTL tanks will work at the double...

The heavy ion linac in Lanzhou is designed as a future injector for the Cooling Storage Ring (CSR). In order to keep the total machine within 40 meters, the IH (Interdigital H-type) structure is adopted for its higher acceleration gradient compared with the traditional DTL structure. The designed minimum charge over mass ratio is 1/6, the output energy is 16MeV/u and the beam current is 1A·μA. The RFQ and the first DTL tank will work at 100MHz, and the other DTL tanks will work at the double frequency. The design criteria, main parameters and the detailed beam dynamic design are introduced in this paper.

兰州重离子直线加速器是作为兰州重离子冷却储存环(CSR)未来的注入器而开始的一个新项目,其目的是为CSR提供更好束流品质及更高流强的束流,更加充分的发挥CSR的潜能,同时也可以为超重等研究直接提供束流.其设计最小荷质比为1/6,引出能量为16MeV/u,设计流强为1A·μA,工作频率为100MHz及其倍频200MHz.采用超导ECR离子源、RFQ及IH型DTL加速结构的方式,设计总长度小于40m.整个工程分阶段进行,现阶段的工作重点是第一个IH腔体之前的工作于基频的部分,本文主要介绍这部分的动力学设计及整台机器的基本参数.

 
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