Fundamental Research in SRF at TRIUMF

TRIUMF 的 SRF 基础研究

• 批准号: SAPIN-2019-00040
• 负责人: Laxdal, Robert
• 金额: $ 6.56万
• 依托单位: TRIUMF
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=718425
• 关键词: Fundamental; Research; SRF; TRIUMF

Studies to optimize and understand rf performance have been focused on elliptical 1.3GHz cavities for electron acceleration. A new wave of hadron SRF linear accelerators are being developed that would operate with continuous wave (cw) rf power. The cavities for hadron accelerators are non-elliptical structures utilizing the TEM accelerating mode and must accelerate a wide range of particle velocities from 5% to ~80% the speed of light and with rf frequencies ranging from 100MHz to 700MHz typically. Our work has convinced us that an understanding of the performance of new processes and new materials requires the ability to study both the microscopic behaviour of materials as well as the performance of full resonator structures. The PI on this proposal has used a previous Discovery grant and RTI funds to support students and equipment to install an rf induction oven, to source two coaxial cavities for rf cryogenic testing at multiple frequencies and to explore the performance of Nb and new materials with muSR (T. Junginger et al. PRAB 2018 21, 032002). In addition RTI funds have been used to purchase equipment for a new betaNMR beamline to further study SRF materials. All the equipment is geared to support student based research programs. The funds requested here will allow us to continue to explore materials at the microscopic level utilizing the expertise and equipment at TRIUMF and the University of British Columbia and materials sourced both internally and through external collaborators. In particular we will continue muSR measurements for testing in the bulk and complete the new spectrometer to the -NMR facility to allow testing field suppression at the surface. The facility would allow measurements of the magnetic field penetration in the sample near the limits of the Meissner state as a function of depth through the London layer. The beta-NMR depth profile diagnostic would offer a test infrastructure unique in the world for providing important answers to the effectiveness of layered structures and open new opportunities in SRF research. Our program of full resonators study will focus mainly on optimizing the performance of non-elliptical coaxial cavities (TEM). The cavities are sized to allow bulk heat treatments including doping in the rf induction oven. During the course of this study we propose to outfit the coaxial resonators with an H-map system and T-map system and the cryostat with multi-axis Helmholtz coils to study flux expulsion in the coaxial geometry. The rf induction oven would also allow development of Nb3Sn coatings on samples then single cell elliptical and TEM mode cavities. The latter would enable testing the effectiveness of Nb3Sn as a function of rf frequency and rf field. The funds are requested to enable discovery science. During the quest students and young professionals will be trained while pursuing ground breaking questions.

优化和理解射频性能的研究一直集中在用于电子加速的椭圆1.3GHz腔上。一种新的强子SRF线性加速器正在开发中，它将使用连续波（cw）射频功率。强子加速器的空腔是利用TEM加速模式的非椭圆形结构，必须加速从5%到~80%光速的宽范围的粒子速度，并且射频频率通常在100 MHz到700 MHz范围内。 我们的工作使我们相信，要了解新工艺和新材料的性能，需要能够研究材料的微观行为以及完整谐振器结构的性能。该提案的PI使用了之前的发现补助金和RTI资金来支持学生和设备安装射频感应炉，在多个频率下为射频低温测试提供两个同轴腔，并探索Nb和新材料的性能。Junginger等人PRAB 2018 21，032002）。此外，RTI的资金还用于购买新的β NMR光束线设备，以进一步研究SRF材料。所有的设备都是为了支持学生为基础的研究计划。 这里要求的资金将使我们能够继续利用TRIUMF和不列颠哥伦比亚省大学的专业知识和设备以及内部和外部合作者提供的材料，在微观层面上探索材料。特别是，我们将继续muSR测量的测试，在散装和完成新的光谱仪的核磁共振设施，使测试场抑制在表面。该设备将允许测量磁场渗透在样品附近的迈斯纳状态的极限作为深度的函数通过伦敦层。β-NMR深度剖面诊断将提供世界上独一无二的测试基础设施，为层状结构的有效性提供重要答案，并为SRF研究提供新的机会。 我们的全谐振腔研究计划将主要集中在优化非椭圆同轴腔（TEM）的性能。 腔体的尺寸被设计成允许在射频感应炉中进行包括掺杂的整体热处理。 在这项研究的过程中，我们建议装备的同轴谐振器与H-地图系统和T-地图系统和低温恒温器与多轴亥姆霍兹线圈研究磁通驱逐同轴几何形状。射频感应炉还允许在样品上形成Nb 3Sn涂层，然后是单电池椭圆和TEM模式腔。后者将使得能够测试Nb 3Sn作为RF频率和RF场的函数的有效性。 这些资金是为了促进科学发现。 在探索过程中，学生和年轻的专业人士将在追求突破性问题的同时接受培训。