Development of a Superconducting Radio Frequency Quadrupole (Physics)

这笔拨款支持研究和开发一种新型直线加速器结构，超导射频四极杆（SRFQ）。超导直线加速器技术和RFQ技术都已经达到了足够先进的状态，因此两者的结合可以有很大的信心进行尝试。这项研究将推动超导加速器的科学发展，并为超低速离子束100%占空比加速等许多重要应用提供一种新的独特工具。这个项目的目标是设计、建造和测试一个完整的原型装置。设计研究将研究离子源与RFQ之间的纵向和径向匹配问题，以及RFQ单元之间的匹配问题，边缘场问题，以及沿RFQ的加速场变化。谐振器的研究，也将进行。这些将包括4杆RFQ参数的分析和数值研究，以及与4叶片RFQ的比较。在设计研究之后，将建造一个原型装置。将进行RFQ在正常导电和超导状态下的测试，包括磁头测试、探针校准、多封装测试、低场Q和高场性能测试。该项目将在超导RFQ的光束测试中达到高潮。

This grant supports research and development of a new type of linear accelerator structure, the superconducting Radio Frequency Quadrupole (SRFQ). Both superconducting linac techniques and RFQ technology have reached a sufficiently advanced state so that the combination of the two may be tried with a large degree of confidence. This research will advance the science of superconducting accelerators and provide a new and unique tool for many important applications such as the 100% duty factor acceleration of very low velocity ion beams. The goal of the proposed project is to design, build and test a complete prototype unit. The design study will investigate the problem of longitudinal and radial matching between the ion source and the RFQ as well as between RFQ units, fringe fields problems, and the accelerating field variation along the RFQ. Resonator studies, also will be carried out. These will include analytic and numerical investigations of the 4-rod RFQ parameters and comparison with the 4-vane RFQ. Following the design studies, a prototype unit will be constructed. Tests of the RFQ in the normal-conducting and superconducting states, including bead tests, calibration of the probes, test for multipactoring, low field Q and high field performance, will be carried out. The project will culminate in beam tests of the superconducting RFQ.