IHEP 1.3 GHz LOW LOSS LARGE GRAIN 9-CELL CAVITY FABRICATION, PROCESSING AND TEST

The combination of the low-loss shape and large grain niobium material is expected to be the possible way to achieve higher gradient and lower cost for ILC 9-cell cavities, and will be essential for the ILC 1 TeV upgrade. As the key component of the “IHEP 1.3 GHz SRF Accelerating Unit Project”, a low-loss shape 9-cell cavity with full end groups using Ningxia large grain niobium (IHEP-02) was fabricated at IHEP in 2012. The cavity was processed (XMP and EP) and tested at FNAL in 2013. The cavity processing, test performance and gradient limitation are reported in this paper.