Realization for 4K operation using Nb superconducting cavity and advanced superconducting technology

• Project/Area Number: 26610076
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: High Energy Accelerator Research Organization
• Principal Investigator: Yoshida Mitsuhiro 大学共同利用機関法人高エネルギー加速器研究機構, 加速器研究施設, 准教授 (60391710)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: 加速器 / 超伝導 / 極低温冷凍機

Outline of Final Research Achievements

Superconducting accelerating structure is made of Nb which has Tc of 9.2 K, and it is currently only candidate. The anomolous skin effect which is caused by the electron scattering by the RF field makes the limitation of the quality factor and the operating temperature of 1.5 K is required. This causes the difficulties of the cooling system.
In this research, the NbN thin film is used for the higher temperature material and cooper pair is supplied from this NbN to Nb. Further another advanced superconducting technology is adopted for the better performance.