橡树岭国家实验室最近的氢离子源研究与开发工作

IF 1.3 4区 工程技术 Q3 INSTRUMENTS & INSTRUMENTATION
R. Welton, B. Han, M. Stockli, S. Murray, T. Pennisi, C. Stinson, V. Andzulis, G. Terszakowec, C. Piller, O. Tarvainen, D. Willis
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引用次数: 0

摘要

美国溅射中子源(SNS)是一个最先进的中子散射设施,它向一系列广泛的仪器提供世界上最强烈的脉冲中子束,这些仪器用于在科学和工程的许多领域进行研究。中子是通过液态汞的剥落产生的,由一个存储环以 60 Hz 的频率提供短(∼1 μs)、强(∼35 A)的质子脉冲轰击,该存储环由一个高强度的∼1 GeV H- LINAC 供电。该设施自 2006 年以来几乎连续运行,离子源的性能逐年提高,目前可提供 50-60 mA 的 H- 离子,负载系数为 6%,免维护运行数月,可用率接近 100%。ORNL 的离子源研发工作在实现和支持这一成功方面发挥了关键作用:本报告介绍了自 2020 年上一次负离子束和源(NIBS)会议以来正在进行的一些离子源研发工作的最新情况。其中包括通过从更大的离子源出口孔径中提取氢束流,以及改进电子倾卸系统,从而大幅提高氢束流。此外,还实现了外部天线离子源等离子点火系统的改进和简化,这是一个长期存在的问题。最后,还测量了 SNS 内部和外部天线离子源的射频耦合效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Recent H- ion source research and development at the Oak Ridge National Laboratory
The U.S. Spallation Neutron Source (SNS) is a state-of-the-art neutron scattering facility delivering the world's most intense pulsed neutron beams to a wide array of instruments which are used to conduct investigations in many fields of science and engineering. Neutrons are produced from spallation of liquid Hg by bombardment of short (∼1 μs), intense (∼35 A) pulses of protons delivered at 60 Hz by a storage ring which is fed by a high-intensity, ∼1 GeV H- LINAC. This facility has operated almost continuously since 2006, with ion source performance increasing over those years, and currently providing 50–60 mA of H- ions with a duty-factor of 6% for maintenance-free runs of several months with near 100% availability. Ion source research and development at ORNL has played a key role in enabling and supporting this success: this report provides an update on some of the ongoing ion source research and development efforts which have been undertaken since the previous Negative Ion Beams and Sources (NIBS) conference in 2020. These include significant improvements to H- beam current by extraction from a larger source outlet aperture and improvements to the electron dumping system which should eliminate the gradual loss of electrode voltage over the course of a run which has occasionally impacted SNS operations. Improvement and simplification of the plasma ignition system for the external antenna ion source, a long-standing problem, was also realized. Lastly, RF coupling efficiency was measured for both the SNS internal and external antenna ion sources.
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来源期刊
Journal of Instrumentation
Journal of Instrumentation 工程技术-仪器仪表
CiteScore
2.40
自引率
15.40%
发文量
827
审稿时长
7.5 months
期刊介绍: Journal of Instrumentation (JINST) covers major areas related to concepts and instrumentation in detector physics, accelerator science and associated experimental methods and techniques, theory, modelling and simulations. The main subject areas include. -Accelerators: concepts, modelling, simulations and sources- Instrumentation and hardware for accelerators: particles, synchrotron radiation, neutrons- Detector physics: concepts, processes, methods, modelling and simulations- Detectors, apparatus and methods for particle, astroparticle, nuclear, atomic, and molecular physics- Instrumentation and methods for plasma research- Methods and apparatus for astronomy and astrophysics- Detectors, methods and apparatus for biomedical applications, life sciences and material research- Instrumentation and techniques for medical imaging, diagnostics and therapy- Instrumentation and techniques for dosimetry, monitoring and radiation damage- Detectors, instrumentation and methods for non-destructive tests (NDT)- Detector readout concepts, electronics and data acquisition methods- Algorithms, software and data reduction methods- Materials and associated technologies, etc.- Engineering and technical issues. JINST also includes a section dedicated to technical reports and instrumentation theses.
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