Breakdown insensitive acceleration regime in a metamaterial accelerating structure

IF 1.5 3区物理与天体物理 Q3 PHYSICS, NUCLEAR

Physical Review Accelerators and Beams Pub Date : 2024-04-08 DOI:10.1103/physrevaccelbeams.27.041301

Dillon Merenich, Brendan Leung, Gaurab Rijal, Xueying Lu, Scott Doran, Gongxiaohui Chen, Wanming Liu, Chunguang Jing, John Power, Charles Whiteford, Eric Wisniewski

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Abstract

A new regime in radiofrequency (rf) breakdown, named the breakdown insensitive acceleration regime (BIAR), was observed in an 11.7 GHz metamaterial structure for wakefield acceleration driven by rf pulses with a duration of a few nanoseconds. In the BIAR, rf breakdown occurs without interrupting potential beam acceleration, resulting in greater resilience to breakdown. We have investigated the possibility that BIAR can support higher gradients by characterizing the breakdown in a high-power test. The peak gradient reached

190 MV / m

when the structure was powered by 6 ns long rf pulses with 115 MW peak power. The short rf pulses were extracted from 65 MeV electron bunch trains with a total charge of up to 210 nC. This work has revealed the benefits of short-pulse acceleration by characterizing rf breakdown in the previously unexplored parameter space.

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超材料加速结构中的击穿不敏感加速机制

在一个 11.7 GHz 的超材料结构中观察到了一种新的射频击穿机制，被命名为击穿不敏感加速机制（BIAR），用于由持续时间为几纳秒的射频脉冲驱动的唤醒场加速。在 BIAR 中，射频击穿发生时不会中断潜在的光束加速，因此具有更强的抗击穿能力。我们通过分析高功率测试中的击穿特征，研究了 BIAR 支持更高梯度的可能性。当结构由峰值功率为 115 兆瓦的 6 毫微秒长射频脉冲供电时，峰值梯度达到 190 MV/m。短射频脉冲是从总电荷高达 210 nC 的 65 MeV 电子束列车中提取的。这项工作揭示了短脉冲加速的好处，即在以前未探索过的参数空间中描述射频击穿的特征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physical Review Accelerators and Beams Physics and Astronomy-Surfaces and Interfaces

CiteScore

3.90

自引率

23.50%

发文量

158

审稿时长

23 weeks

期刊介绍： Physical Review Special Topics - Accelerators and Beams (PRST-AB) is a peer-reviewed, purely electronic journal, distributed without charge to readers and funded by sponsors from national and international laboratories and other partners. The articles are published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. It covers the full range of accelerator science and technology; subsystem and component technologies; beam dynamics; accelerator applications; and design, operation, and improvement of accelerators used in science and industry. This includes accelerators for high-energy and nuclear physics, synchrotron-radiation production, spallation neutron sources, medical therapy, and intense-beam applications.