Medium grain niobium SRF cavity production technology for science frontiers and accelerator applications. (1st April 2023)

• Record Type: Journal Article
• Authors: Myneni, G.; Ciovati, G.; Dhakal, P.; Rimmer, R.A.; Khanal, B.D.; Dohmae, T.; Saeki, T.; Umemori, K.; Yamanaka, M.; Michizono, S.; Carl, M.; Fajardo, A.; Lannoy, N.; Elsayed-Ali, H.E.; Islam, Md O.; Sayeed, Md N.; Kumar, A.; Yamamoto, A.
• Is Part Of: Journal of instrumentation. Volume 18:Number 4(2023)
• Publication Date: 2023-04-01
• Subjects: Acceleration cavities and superconducting magnets (high-temperature superconductor, radiation hardened magnets, normal-conducting, permanent magnet devices, wigglers and undulators) -- Accelerator Applications; Scientific apparatus and instruments -- Periodicals; 502.84
• DOI: 10.1088/1748-0221/18/04/T04005
• Languages: English
• ISSNs: 1748-0221

Abstract

Abstract: We present the cost-effective production of superconducting radio frequency (SRF) cavities made of medium grain (MG) niobium (Nb) discs directly sliced from forged and annealed billet. This production method provides clean surface conditions and reliable mechanical characteristics with sub-millimeter average grain size resulting in stable SRF cavity production. We propose to apply this material to particle accelerator in the science and industrial applications. The science applications require high field gradients(≥ 30 MV/m) particularly in pulsed mode. The industrial applications require high Q 0 values with moderate gradients (∼ 20 MV/m) in CW mode operation. This paper describes the MG Nb disc production recently demonstrated and discusses future prospects for application in advanced particle accelerators in the science and industrial applications.