MHI's activities for superconducting accelerator are reported. MHI have supplied several 9-cell cavities for STF (R&D of ILC project at KEK) and have been considering production method for stable quality and cost reduction. And we had fabricated and installed cryomodules for STF and ERL R&D. These activities are reported in detail.
MHI have supplied several 9-cell cavities for STF (R&D of ILC project at KEK) and have been considering production method for stable quality and cost reduction, seamless dumb-bell cavity was one of them. We had fabricated a 2 cell seamless dumb-bell cavity for cost reduction and measured RF performance in collaboratio with JLab, KEK and MHI. Surface treatment recipe for ILC was applied for MHI 2-cell cavity and vertical test was performed at JLab. The cavity reached Eacc=32.4MV/m after BCP and EP. Details of the result are reported.
MHI has supplied 1.3GHz superconducting cavities for the Energy Recovery Linac (ERL) project and the International Linear Collider (ILC) R&D project (STF: Superconducting RF Test Facility in KEK) to KEK in Japan for several years.  We are improving the technology to design and fabricate the superconducting cavities for ILC R&D step by step. The status of superconducting cavity development for ILC at MHI is described in this paper.
An X-ray free electron laser (XFEL) is under construction at RIKEN/Spring-8. In this project, a Cband choke mode accelerating structures and C-band RF pulse compressors are employed to obtain a high acceleration gradient of more than 35 MeV/m. As of May 2010, we have completed the fabrication of all units and conducted RF measurements on them. It reports on the result of these 64 C-Band units and result of the installation of injector section.
A 10 MeV 25 KW class electron LINAC was developed for sterilization of medical devices. The LINAC composed of a standing wave type single cavity prebuncher and a 2 m electroplated traveling wave guide uses a 5 MW 2856 MHz pulse klystron as an RF source and provides 25 KW beam power at the Ti alloy beam window stably after the energy analyzing magnet with plus-minus 1 MeV energy slit. The practical maximum beam power reached 29 KW and this demonstrated the LINAC as one of the most powerful S-band electron LINACs in the world. The control of the LINAC is fully automated and the "One-Button Operation" is realized,which is valuable for easy operation as a plant system. 2 systems have been delivered and are being operated stably.
A compact drift tube will be used for the drift-tube linac (DTL) which is under development for the Japanese Hadron Project (JHP). The methods are briefly described for holding the permanent quadrupole magnet fixed into the drift-tube cell and for assembling the drift tube onto the DTL cavity tank.
A high-power model of the annular-coupled structure (ACS) was fabricated and tuned to an operating frequency of 1296 MHz for the Japanese Hadron Project (JHP). The nose-cone region is cooled by water channels in the unit in order to make possible the high-duty operation. Some details are described for machining high-Q, ultra-precision cavity segments including coupling slots. Detailed tuning procedures and brazing techniques are also presented.
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