In recent years, the acceleration at 100MV/m at X-band frequency range with travelling-wave accelerator structure is being realized, based on the Linear Collider R&D and recent research advancement. This X-band technology has now been started to be considered as candidates for many accelerators worldwide.
Here we describe the world-wide trend through the recent three international meetings,
November 2010: X-band international workshop (XB10) at UK
May 2011:5th X-band accelerator structure design and test program at SLAC
June 2011:International workshop on mechanisms on vacuum arcs at Helsinki
In this report, we also describe the issues and view points, which we should address to understand the physics needed for the further advancement.
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