IH直线加速器101.28 MHz注入器结构的束流动力学研究
Beam Dynamics Investigation of the 101.28 MHz IH Structure as Injector for the HIE-ISOLDE SC Linac
摘要：
CERN的HIE-ISOLDE项目的第一阶段包括超导（SC）直线加速器升级，以将后加速放射性离子束的能量从2.8 MeV/u增加到10 MeV/u以上（A/q = 4.5）。在升级的准备，我们提出的助推器部分的正常传导（NC）REX-ISOLDE直线加速器的束流动力学研究，集中在101.28 MHz的叉指H模式结构（IHS），采用组合零度结构（KONUS），在超过3 MV/m的高梯度脉冲束的纵向发展。SC直线加速器中的横向发射度的演变关键取决于从现有直线加速器注入的粒子的纵向相空间分布，并且随着对上游束流动力学的更好理解，升级的性能可以被优化。在调试阶段的REX-ISOLDE直线加速器的数据进行分析，以了解在助推器中的光束的属性，并结合束流动力学模拟，其中包括现实领域的IHS，从模拟和扰动测量确定。
英文摘要：
The first phase of the HIE-ISOLDE project at CERN consists of a superconducting (SC) linac upgrade in order to increase the energy of post-accelerated radioactive ion beams from 2.8 MeV/u to over 10 MeV/u (for A/q = 4.5). In preparation for the upgrade, we present beam dynamics studies of the booster section of the normal conducting (NC) REX-ISOLDE linac, focused on the longitudinal development of the beam in the 101.28 MHz Interdigital H-mode Structure (IHS), employing a Combined Zero Degree Structure (KONUS), pulsing at a high gradient of over 3 MV/m. The evolution of the transverse emittance in the SC linac depends critically on the injected longitudinal phase space distribution of particles from the existing linac and, with a better understanding of the beam dynamics upstream, the performance of the upgrade can be optimised. Data taken during the commissioning phase of the REX-ISOLDE linac is analysed to understand the properties of the beam in the booster and combined with beam dynamics simulations which include the realistic fields of the IHS, determined from both simulation and perturbation measurement.
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