Graduate Research at Michigan State University to Push the Intensity Frontier and Support Accelerator Science

密歇根州立大学研究生研究推动强度前沿并支持加速器科学

• 批准号: 1632761
• 负责人: Steven Lund
• 金额: $ 20.1万
• 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: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2020-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1632761&HistoricalAwards=false
• 关键词: Graduate; Research; Michigan; State; University

This project will push the frontier in intensity of ion beams produced by superconducting ion accelerators. High accelerator performance requires a bright, continuous source of ions, and for that ion accelerators typically use sources of high-charge-state ions which can be efficiently accelerated. Such sources, called Electron Cyclotron Resonance or ECR sources, are complex with rich physics to be explored. In this project, factors leading to unreliable ECR source operation will be studied. Diagnostics will systematically gather information to better understand, mitigate, and control reliability issues. This research will be carried out at Michigan State University, where it will help to improve performance of existing ion sources. This project will train one PhD graduate student in accelerator physics technology. To maintain a stable and compact beam phase-space for reliable machine operation of continuous wave superconducting radio-frequency (SRF) linacs, ECR sources must continuously inject ion beams with low drifts and stable output. In this project, ECR sources at the National Superconducting Cyclotron Laboratory (NSCL) and the Facility for Rare Isotope Beams (FRIB) will be instrumented to measure correlations of temperature in key system components with the current output. A data logging system will be developed, drift correlations identified, and mitigations will be tested. Fast plasma instabilities are also observed in high intensity ECR operation and can lead to ~25% or more oscillations in beam current with potential machine damage. These instabilities will be studied with the FRIB and NSCL sources using higher-charge-state ions, where understanding of the instability will be improved through analytical studies, development of simple parametric models, and synergetic collaboration with other research groups. The timeline of the project will cover three years and is consistent with early commissioning activities on the FRIB front-end and leverages FRIB hardware.

该项目将以超导离子加速器产生的离子束强度推动边界。高加速器性能需要明亮，连续的离子来源，并且对于该离子加速器通常使用高充电状态离子的来源，可以有效地加速。 这种称为电子回旋共振或ECR来源的来源很复杂，可以探索丰富的物理学。在该项目中，将研究导致不可靠的ECR源操作的因素。诊断将系统地收集信息，以更好地理解，减轻和控制可靠性问题。这项研究将在密歇根州立大学进行，在那里它将有助于提高现有离子源的性能。该项目将培训一名加速器物理技术的博士学位研究生。为了保持稳定而紧凑的梁相位空间，以可靠的机器操作连续波超导射频（SRF）LINACS，ECR源必须连续地注射离子梁，其漂移且输出稳定。 在这个项目中，将使用仪器进行仪器，以测量关键系统组件中与当前输出的键系统中的温度相关性，以测量稀有同位素束（FRIB）的ECR源和稀有同位素梁（FRIB）的设施。 将开发数据记录系统，确定漂移相关性，并测试缓解。 在高强度的ECR操作中还观察到快速血浆不稳定性，并可能导致梁电流中〜25％或更多的振荡，并具有潜在的机器损坏。 这些不稳定性将使用FRIB和NSCL来源研究，使用高电荷状态离子，通过分析研究，简单参数模型的开发以及与其他研究小组的协同合作，对不稳定性的理解将得到改善。 该项目的时间表将涵盖三年，并且与Frib前端和FRIB硬件的早期调试活动保持一致。