New results of development on high efficiency high gradient superconducting rf cavities

Conference · Tue Sep 01 00:00:00 EDT 2015

OSTI ID:1223452

Geng, Rongli ^[1]; Li, Z. K. ^[2]; Hao, Z. K. ^[3]; Liu, K. X. ^[3]; Zhao, H. Y. ^[4]; Adolphsen, C. ^[2]

---

1. Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
3. Peking Univ., Beijing (China)
4. OTIC, Ningxia (China)

We report on the latest results of development on high-efficiency high-gradient superconducting radio frequency (SRF) cavities. Several 1-cell cavities made of large-grain niobium (Nb) were built, processed and tested. Two of these cavities are of the Low Surface Field (LSF) shape. Series of tests were carried out following controlled thermal cycling. Experiments toward zero-field cooling were carried out. The best experimentally achieved results are E_acc = 41 MV/m at Q₀ = 6.5×10¹⁰ at 1.4 K by a 1-cell 1.3 GHz large-grain Nb TTF shape cavity and E_acc = 49 MV/m at Q₀ = 1.5×10¹⁰ at 1.8 K by a 1-cell 1.5 GHz large-grain Nb CEBAF upgrade low-loss shape cavity.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1223452
• Report Number(s): JLAB-ACC-15-2075; DOE/OR/23177-3432; TRN: US1601428
• Resource Relation: Conference: IPAC 2015, Richmond, VA (United States), 3-8 May 2015
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
SUPERCONDUCTING CAVITY RESONATORS
GHZ RANGE 01-100
TEMPERATURE RANGE 0000-0013 K
NIOBIUM
EFFICIENCY
SHAPE
THERMAL CYCLING
COOLING
QUALITY FACTOR