Development of a beam energy adjustment system after a Radio-Frequency-Quadrupole-猫眼课题宝

DOI：

10.1016/j.nima.2022.167095

发表时间：

2022-07

期刊：

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

Y. Yang;R.X. Tian;Y. Zhai;X.W. Wang;X. Jin;L.B. Li;L. Jing;J.B. Li;B. Zhang;Y. Tang;R. Mao;Z.G. Xu;H.Y. Ma;X. Xu;T. Zhu;P. Zhang;Y.H. Guo;W.H. Zhang;Y.C. Feng;L.T. Sun;X.D. Tang;H.W. Zhao

低能重离子加速器设施（LEAF）是在现代物理研究所（IMP）开发的用于多学科研究的低能，高强度，重离子加速器。该设施的束流调试于2018年开始，但直到最近，只有0.5 MeV/u的固定束流能量可用，因为主要加速器结构是射频四极杆（Radio-Frequency Quadrupole，缩写为LEAF），这阻碍了LEAF满足实验终端的要求，例如，在天体物理能区进行12 C +12 C聚变反应研究，需要束流能量在0.3 ~ 0.7MeV/u范围内可调。为了扩大束流能量范围，研制了一种“恒β”结构的漂移管直线加速器（DTL），束流能量可在0.3 ~ 0.7 MeV/u范围内调节。为了控制光束质量，特别是能量扩散，采用两个再聚束器，一个在DTL的上游，一个在DTL的下游。本文介绍了该系统的关键器件：叉指H模DTL（IH-DTL）。首先，我们讨论了光束能量调节系统的光束动力学设计，然后我们提出的测试台的细节，最后，我们报告完成的硬件进行测量。能量调节和能量扩散的测量结果与仿真结果吻合较好，证明了该设计的可行性。

The Low Energy heavy-ion Accelerator Facility (LEAF) is a low-energy, high-intensity, heavy ion accelerator for multidisciplinary research developed at the Institute of Modern Physics (IMP). Beam commissioning of the facility began in 2018, but until recently, only a fixed beam energy of 0.5 MeV/u was available because the main accelerator structure is a Radio-Frequency Quadrupole (RFQ), which hinders LEAF to meet the requirements of the experimental terminals, for example,12C+12C fusion reaction investigation at astrophysical energies requires beam energies adjustable from 0.3 MeV/u to 0.7 MeV/u. To expand the beam energy range, a “constant-beta” structure Drift Tube Linac (DTL) was developed providing an adjustable beam energy from 0.3 to 0.7 MeV/u. To control the beam quality, specifically the energy spread, two re-bunchers are employed, one upstream and one downstream of the DTL. Here we present the development of the key device: an Interdigital H-mode DTL (IH-DTL). First, we discuss the beam dynamics design for the beam energy adjustment system, then we present details of the test bench, and finally, we report measurements performed with the finished hardware. The measurements of energy adjustment and energy spread agree well with the simulations, demonstrating the feasibility of this design.

Development of a beam energy adjustment system after a Radio-Frequency-Quadrupole

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