High Gradient Properties of a CLIC Prototype Accelerating Structure made by Tsinghua University

A CLIC prototype structure, T24_THU_#1, was recently high-gradient tested at KEK X-band test stand, Nextef. The copper parts of this 24-cell TW structure were delivered from CERN, were bonded and brazed, bench-tested and tuned in Tsinghua University. The aim of this test was not only to verify the cavity high-gradient properties under 100 MV/m but also to study the breakdown phenomenon in high gradient. High power test results were presented and breakdown rate under 100 MV/m was compared to previously-tested CLIC prototype structures. The assembly capability of Tsinghua University for X-band high gradient structures was validated by the good high gradient performance of T24_THU_#1. 7th International Particle Accelerator Conference, Busan, Korea, 8 13 May 2016 Geneva, Switzerland 12 May 2016 CLIC – Note – 1104 HIGH GRADIENT PROPERTIES OF A CLIC PROTOTYPE ACCELERATING STRUCTURE MADE BY TSINGHUA UNIVERSITY Xiaowei Wu*1,2, Jiaru Shi†1,2, Huaibi Chen1,2, Toshiyasu Higo3, Shuji Matsumoto3, Walter Wuensch4, 1Department of Engineer Physics, Tsinghua University, Beijing 100084, P.R.China 2Key Laboratory of Particle & Radiation Imaging, Tsinghua University, Beijing 100084, P.R.China 3 KEK, Tsukuba, 305-0801, Japan 4CERN, Geneva, Switzerland Abstract A CLIC prototype structure, T24_THU_#1, was recently high-gradient tested at KEK X-band test stand, Nextef. The copper parts of this 24-cell TW structure were delivered from CERN, were bonded and brazed, bench-tested and tuned in Tsinghua University. The aim of this test was not only to verify the cavity high-gradient properties under 100 MV/m but also to study the breakdown phenomenon in high gradient. High power test results were presented and breakdown rate under 100 MV/m was compared to previously-tested CLIC prototype structures. The assembly capability of Tsinghua University for X-band high gradient structures was validated by the good high gradient performance of T24_THU_#1.A CLIC prototype structure, T24_THU_#1, was recently high-gradient tested at KEK X-band test stand, Nextef. The copper parts of this 24-cell TW structure were delivered from CERN, were bonded and brazed, bench-tested and tuned in Tsinghua University. The aim of this test was not only to verify the cavity high-gradient properties under 100 MV/m but also to study the breakdown phenomenon in high gradient. High power test results were presented and breakdown rate under 100 MV/m was compared to previously-tested CLIC prototype structures. The assembly capability of Tsinghua University for X-band high gradient structures was validated by the good high gradient performance of T24_THU_#