A low loss 1.3 GHz 9-cell superconducting cavity developed by the Institute of High Energy Physics (IHEP) achieved 20MV/m in 

the 9-cell cavity

its first vertical test at KEK on July 1, 2010, which marked an important progress on the R & D of super-conducting RF technology.

The cavity (IHEP-01) is made of large grain niobium from OTIC, Ningxia. Its fabrication started in February, 2009 and finished in April 2010 after electron beam welding (EBW), followed by centrifugal barrel polishing (CBP), and buffered chemical polishing (BCP) and pre-tuning with the newly developed SRF facilities at IHEP.

On June 4, it was sent to KEK for ultrasonic cleaning and high pressure rinsing (HPR) and was vertically tested at 2 K temperature on July 1, 2010. Surface defects were found and repaired. The second test will be arranged in the latter half of this year.

1.3 GHz SRF technology is of essential importance to the construction of high energy accelerators. The 9-cell cavity is one of the key items of the IHEP innovation program. The successful test proves that a key step has been made toward the accomplishment of that program.