MRI-R2: Development of A High-Performance Gas-Filled Cyclotron Stopper

MRI-R2：高性能充气回旋加速器塞的开发

• 批准号: 0958726
• 负责人: David Morrissey
• 金额: $ 328.08万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-04-01 至 2013-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0958726&HistoricalAwards=false
• 关键词: MRI; R2; Development; Performance; Gas

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).This award will support the development of a new and unique device, at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University, to capture short-lived isotopes produced in nuclear reactions that will facilitate a wide range of new nuclear science. The NSCL is the forefront facility in the US for nuclear science using fast projectile fragments (GeV kinetic energies) and is the world leader in the thermalization and precision mass measurements of these projectile fragments. Nearly a fifth of the chemical elements have been thermalized and measured at the NSCL in the last four years. The NSCL is currently building on this success by expanding its experimental arena for precision studies with thermalized projectile fragments to include laser spectroscopy and, in a major step forward, to low-energy nuclear reactions. Funds from this award will be used to develop a robust gas-stopping concept for projectile fragments, particularly for light-ion and high intensity beams that will be difficult to produce with existing technology. The new gas stopper will slow down and thermalize very high-energy projectile fragments in a large gas filled chamber inside a cyclotron-type magnet. Such a gas-filled cyclotron stopper will be able to provide thermalized ions without regard to their chemical nature, with half-lives as short as tens of milliseconds, and at high incident rates. The development of a novel technique to slow down, capture, and extract these difficult beams using a gas-filled reverse-cyclotron will thus have broad impact by: (1) providing the wide range of beams required for the next generation of precision mass measurements and laser spectroscopy at the NSCL, and (2) allowing unique studies of low-energy nuclear reactions with intense beams of short-lived isotopes that are not available anywhere else in the world. The proposed work will be performed by a collaboration of researchers at MSU, RIKEN (in Japan) and GSI (in Germany) and includes the creation of a break-through device on a three-year timescale. This collaboration has significant expertise in all aspects of the work and the project will foster the technical and scientific exchange among these laboratories. The cyclotron-stopper will be constructed at the NSCL and installed on a dedicated beam line for full-scale testing and subsequent connection to the low-energy arena and re-accelerator. This instrumentation will be a critical component of the NSCL-based research program of many students and postdoctoral scholars.

该奖项根据 2009 年《美国复苏与再投资法案》（公法 111-5）提供资助。该奖项将支持密歇根州立大学国家超导回旋加速器实验室 (NSCL) 开发一种新型独特设备，以捕获核反应中产生的短寿命同位素，从而促进广泛的新核科学的发展。 NSCL 是美国使用快速射弹碎片（GeV 动能）进行核科学的前沿设施，并且在这些射弹碎片的热化和精确质量测量方面处于世界领先地位。 过去四年中，近五分之一的化学元素已在 NSCL 进行热化和测量。 NSCL 目前正在这一成功的基础上扩大其热化射弹碎片精密研究的实验范围，将激光光谱纳入其中，并向前迈出了一大步，将其纳入低能核反应。该奖项的资金将用于开发针对射弹碎片的强大气体阻挡概念，特别是针对现有技术难以生产的轻离子和高强度光束。 新的气体塞将在回旋加速器型磁铁内的大型充气室中减速并热化非常高能的射弹碎片。 这种充气回旋加速器塞子将能够提供热化离子，无论其化学性质如何，半衰期短至数十毫秒，并且入射率高。因此，开发一种使用充气反回旋加速器来减慢、捕获和提取这些困难光束的新技术将产生广泛的影响：(1) 为 NSCL 提供下一代精密质量测量和激光光谱所需的各种光束，(2) 允许使用世界其他任何地方都无法获得的短寿命同位素强光束对低能核反应进行独特的研究。拟议的工作将由密歇根州立大学、RIKEN（日本）和 GSI（德国）的研究人员合作完成，包括在三年的时间内创建一个突破性的设备。此次合作在工作的各个方面都具有重要的专业知识，该项目将促进这些实验室之间的技术和科学交流。回旋加速器阻挡器将在 NSCL 建造，并安装在专用光束线上，以进行全面测试以及随后与低能竞技场和再加速器的连接。该仪器将成为许多学生和博士后学者基于 NSCL 的研究项目的重要组成部分。