MRI: Development of the IsoDAR Front-end

MRI：IsoDAR 前端的开发

• 批准号: 1626069
• 负责人: Janet Conrad
• 金额: $ 87.93万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1626069&HistoricalAwards=false
• 关键词: MRI; Development; IsoDAR; Front; end

This award funds the development of a Radio Frequency Quadrupole (RFQ) to be used as part of a front-end for ion injection into a cyclotron, a type of particle accelerator. The outcome will be a novel, fully-working front-end instrument that can be used for multiple purposes. Based on a concept originally introduced in 1981, but never realized, this will be the first demonstration of RFQ direct injection into a compact, high intensity cyclotron. The design is potentially transformative and promises a 3-5 times increase in efficiency of bunching and injection over classic front-end cyclotron designs. It is more compact and of comparable cost, significantly advancing accelerator technology. The accelerator system planned relies on conventional, well known, proven technologies. The innovation is in the combination of these technologies. The challenges are in the demonstration of, on one hand, the individual performances of the various components (the current from a source, RFQ and transmission, and coupling to the cyclotron) and, on the other hand, their integration into a compact, high beam current, cost-effective proton driver front-end. Proton drivers have a broad impact; they are research tools (for neutrino physics, secondary particles for condensed matter research, neutron sources), tools for the future of energy, and more. The development of high intensity cyclotrons has two important impacts for industry. The first is to increase the energy, intensity and versatility of radiopharmaceutical cyclotrons. Protons from a cyclotron can, for example, efficiently produce Strontium-82, important for medical imaging. In addition, this work also has relevance to Accelerator Driven Systems (ADS) technology, applied, for example, to driving thorium reactors, thus supporting the development of safe nuclear energy sources. A factor of 5-10 improvement in current would have a significant impact in these areas. The development and running of the front-end will include MIT undergraduates, graduate students, and postdocs. This will provide an excellent educational experience, with increased accelerator science at universities and more hardware experience for young scientists. Upon successful demonstration, the new front-end could be used in the IsoDAR (Isotope Decay-At-Rest) experiment which has the potential to advance our knowledge about sterile neutrinos and shed light on several anomalies observed with neutrinos.The goal is to make use of RFQ injection of H2+ into a compact cyclotron. Each H2+ ion provides 2 protons after stripping thus reducing the necessary beam current by a factor of 2 and reducing space-charge forces, overcoming the limitations of injecting an intense proton beam into the cyclotron central region. The RFQ injection uses RF radiation in a quadrupole structure as a method to alleviate the ion source requirements by improving the bunching efficiency. The efficiency of the direct coupling of the RFQ to the spiral inflector injection channel of the cyclotron (a matter of bunch matching between the two accelerators) is a delicate part of system integration; it has to be demonstrated and is a goal of the project.

该奖项用于开发射频四极杆(RFQ)，作为回旋加速器离子注入前端的一部分。回旋加速器是一种粒子加速器。其结果将是一种新颖的、完全工作的前端仪器，可以用于多种目的。基于一个最初在1981年引入但从未实现的概念，这将是RFQ直接注入紧凑、高强度回旋加速器的第一次演示。该设计具有潜在的变革性，有望将聚束和注入效率提高3-5倍于经典的前端回旋加速器设计。它更紧凑，成本相当，极大地推进了加速器技术。计划中的加速器系统依赖于传统的、众所周知的、经过验证的技术。创新之处在于这些技术的结合。挑战在于，一方面展示各种部件(来自源的电流、RFQ和传输，以及与回旋加速器的耦合)的单独性能，另一方面，将它们集成到紧凑、大束流、具有成本效益的质子驱动器前端。质子驱动器有广泛的影响；它们是研究工具(用于中微子物理，用于凝聚态研究的次级粒子，中子源)，未来能源的工具，等等。高强度回旋加速器的发展对工业有两个重要的影响。一是提高放射性药物回旋加速器的能量、强度和通用性。例如，来自回旋加速器的质子可以有效地产生锶-82，这对医学成像非常重要。此外，这项工作还与加速器驱动系统(ADS)技术有关，例如应用于驱动钍反应堆，从而支持安全核能来源的开发。目前5-10倍的改善将对这些领域产生重大影响。前端的开发和运行将包括麻省理工学院本科生、研究生和博士后。这将提供极好的教育体验，大学加速器科学的增加，以及年轻科学家更多的硬件经验。在成功演示后，新的前端可以用于IsoDAR(同位素静态衰变)实验，该实验有可能促进我们对稀有中微子的了解，并揭示中微子观测到的几个反常现象。目标是利用RFQ向紧凑的回旋加速器注入H2+。每个H2+离子在剥离后提供2个质子，从而将必要的束流减少到原来的2倍，并减少空间电荷力，克服了向回旋中心区域注入强质子束的局限性。RFQ注入使用四极结构中的射频辐射作为一种方法，通过提高聚束效率来降低对离子源的要求。RFQ直接耦合到回旋加速器螺旋偏转器注入通道的效率(两个加速器之间的束团匹配问题)是系统集成的一个微妙部分；它必须得到证明，也是该项目的目标。