Design of 57.5 MHz CW RFQ for medium energy heavy ion superconducting linac.
Design of 57.5 MHz CW RFQ for medium energy heavy ion superconducting linac.
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DOI：
10.1103/physrevstab.5.060101
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发表时间：
2002-06
影响因子：
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通讯作者：
P. Ostroumov;A. Kolomiets;D. Kashinsky;S. Minaev;V. Pershin;T. E. Tretyakova;S. Yaramishev
中科院分区：
文献类型：
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作者：
P. Ostroumov;A. Kolomiets;D. Kashinsky;S. Minaev;V. Pershin;T. E. Tretyakova;S. Yaramishev
核科学界认为建设稀有同位素加速器（RIA）设施是当务之急。RIA包括一个1.4 GV超导直线加速器，用于生产400千瓦连续波重离子束。一个57.5 MHz的4 m长的室温RFQ可以有效地实现电子回旋共振离子源释放重离子的初始加速。RFQ的主要规格是(i)形成极低的纵向发射度，（ii）在广泛的电压范围内稳定运行，以加速RIA操作所需的各种离子，以及（iii）同时加速铀离子的双荷态。加速结构的连续工作对谐振器提出了许多要求，如高分流阻抗、谐振腔各部分的高效水冷却、精确对准的机械稳定性、可靠的射频触点、稳定的工作模式以及工作期间谐振频率的微调。为了满足这些要求，一种新的谐振结构被开发出来。本文讨论了RFQ腔体的光束动力学和电动力学设计，以及低频连续波RFQ机械设计的一些方面。
The nuclear science community considers the construction of the Rare Isotope Accelerator (RIA) facility as a top priority. The RIA includes a 1.4 GV superconducting linac for production of 400 kW cw heavy ion beams. The initial acceleration of heavy ions delivered from an electron cyclotron resonance ion source can be effectively performed by a 57.5 MHz 4-m long room temperature RFQ. The principal specifications of the RFQ are (i) formation of extremely low longitudinal emittance, (ii) stable operation over a wide range of voltage for acceleration of various ion species needed for RIA operation, and (iii) simultaneous acceleration of two-charge states of uranium ions. cw operation of an accelerating structure leads to a number of requirements for the resonators such as high shunt impedance, efficient water cooling of all parts of the resonant cavity, mechanical stability together with precise alignment, reliable rf contacts, a stable operating mode, and fine tuning of the resonant frequency during operation. To satisfy these requirements a new resonant structure has been developed. This paper discusses the beam dynamics and electrodynamics design of the RFQ cavity, as well as some aspects of the mechanical design of the low-frequency cw RFQ.