可变相位异步回旋加速器
Variable-Phase Asynchronous Cyclotron
摘要：
本文介绍了一种可变相位异步回旋加速器（VPAC）的概念设计，它提供了加速质子或离子束的纵向束团压缩，从而允许在较高的加速效率下实现高电流加速，使可能的束流损失最小化，并放宽了加速器的机械公差。通过独立设置和改变加速相位和射频电压幅度、腔间谐波数和横向聚焦强度的能力来保证束流控制，这在很大程度上克服了所提出的回旋加速器的每个扇区和匝中的空间电荷效应。新的加速器概念特别适合于加速高达800兆电子伏的能量和平均束流在100毫安级的强质子束。所有加速器元件都是基于目前可用和可行的技术。为了证明设计的可行性，详细的计算和建模的10转VPAC原型生产的25.6 MeV，100 mA的质子束和新的加速器概念的主要特点进行了讨论。
英文摘要：
The conceptual design of a Variable-Phase Asynchronous Cyclotron (VPAC) is describe, which provides longitudinal bunch compression of accelerated proton or ion beams, and thus, permits high current acceleration at higher accelerator efficiency, where the possible beam losses are minimized and the accelerator's mechanical tolerances are relaxed. Beam control is assured by the ability to independently set and vary the acceleration phase and rf voltage amplitude, the inter-cavity harmonic number and the transverse focusing strength, which considerably overcome the space charge effects in each sector and turn of the proposed cyclotron. The new accelerator concept is especially suitable to accelerate intense proton beams up to 800 MeV in energy and average beam current in the 100-mA class. All accelerator elements are based on currently available and feasible technologies. To demonstrate feasibility of design, the detailed calculations and modeling of a 10-turn VPAC prototype for the production of 25.6 MeV, 100 mA proton beam are presented and the key features of the new accelerator concept are discussed.
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