[en] In the future large-scale projects like International Linear Collier (ILC), the mass-production technology of superconducting RF cavities is very important. It is necessary to promote more cost-reduction in the fabrication methods, and for this, we must introduce more advanced fabrication methods. In order to address these issues, we installed an Electron Beam Welding (EBW) machine in April 2011 in the Cavity Fabrication Facility (CFF) at KEK, where we have been trying to study the mass-production of superconducting RF cavities. After finishing the first fabricated cavity KEK-#0, we have been studying on the Nb welding characteristics/parameters in the horizontal-gun configuration where it might be suitable for the mass-production, and in particular, we have been performing basic tests to make smoother welding seams/beads on the back-side of the Nb material. In this article, these studies and also the fabrication of second cavity KEK-#1 are reported. (author)

[en] Currently, High Energy Accelerator Research Organization in (KEK) And development of automation technology required for the mass production and industrial production And process management manufacturing process, quality control and research development for cost reduction It is in operation cavity manufacturing and development facility that was established for the purpose of the (CFF) Around the welding work that was carried out electron beam welding machine in the (EBW), I will report-1 Unit In House 9cell Cavity of (KEK # 01) (author)

[en] The development of high gradient superconducting quadrupoles for the LHC (Large Hadron Collider) project has been carried out as part of the CERN-KEK cooperation program for the LHC project. The in-house development work for 1-m models was carried out since 1996 as a cooperative effort of the Cryogenics Science Center, the Mechanical Engineering Center, the Accelerator Research Laboratory, and Institute of Particle and Nuclear Studies in KEK, and has been followed by the full-scale prototype program and the production of the magnets, current in progress, in Japanese industry. This is a technical report focusing on practical R and D work including mechanical design, and the engineering drawings of the magnets and fixtures required to develop the 1-m model magnets. Its purpose is to transfer the engineering and practical technologies, with special attention being paid to the engineering drawings for the magnets and fixtures, to be useful in future development work for accelerator superconducting magnets. (author)

[en] It is necessary to require pressure transmission mechanism in the vacuum and low temperature environment such mechanically RF tuning operation for superconducting RF cavities. As a medium of pressure transmission, water, oil and air can not use such environment. Nano-cluster particles and carbon seems to have possibility of pressure transmission medium. Because their characteristics of chemical and physical reaction at low temperature environment is very stable. Also they have small number of the friction coefficient. We have been studying possibility of their characteristics as pressure transmission medium. (author)

[en] The J-PARC neutrino beam line includes 150 m long superconducting magnet system that bends the proton beam from the main ring by about 80 degree toward Kamioka. The system consists of 14 doublet cryostats; each contains 2 superconducting combined function magnets (SCFM). The SCFM uses two single layer left/right asymmetric coils that produce a dipole field of 2.6 T and quadrupole of 19 T/m. It is the first time that such magnets were actually be built and adapted to a real beam line. The system installation had been completed by the end of 2008. A commissioning of the system was started in December 2008 and completed in May 2009. The system commissioning includes cryogenics and magnet hardware commissioning as well as a beam commissioning. The paper summarizes the results of the commissioning. (author)

[en] Positive ion and electron pairs are produced by a circulating beam which strikes residual gas in the synchrotron ring. Not only by collecting a positive ions, but also by collecting electrons to a rectangular area micro-channel plate (MCP) with multi-anodes, were able to measure the transversal beam profiles within one acceleration period without any damage to the circulating beam. In order to increase the life time and saturation signal current of the MCP, an assemble of many electron multipliers (EM) is used, which is especially useful at locations where a large beam width exists. The combination of two monitors will give us the information concerning the momentum spread in a synchrotron. (author)

[en] A superconducting magnet system for the J-PARC neutrino beam line had been under construction since 2004. The system consists of 14 doublet cryostats; each contains 2 combined function magnets (SCFM). The SCFM uses two single layer left/right asymmetric coils that produce a dipole field of 2.6 T and quadrupole of 19 T /m. The SCFMs had been developed by 2004, mass-produced since 2005, and completed by summer 2008. The system has been installed since Feb. 2008 till the end of 2008. The commissioning of the system has been carried out in Jan. to Mar. 2009. The paper summarizes the magnet development and system overview including cryogenics. The paper also reports the production, installation and commissioning status. (author)

[en] Using the electron beam welding machine installed in the development shared building, we are fabricating in-house 9-cell superconducting accelerating cavities for the ILC. The next phase involves research and development aimed at developing automation technology and reducing costs. This report focuses on the first unit currently under production. (J.P.N.)

[en] At present, the AR of TRISTAN is operated at the beam energy 6.5 GeV and the beam current 30 mA. At this time, the power of the synchrotron radiation generated by the beam bent with deflection magnets is 1.4 kW/m. The absorbers fixed for protecting the ceramic chamber were damaged by thermal load, therefore, it was decided to develop the absorbers that can withstand synchrotron radiation and cope with the increase of beam intensity. There are the absorbers made of copper-aluminum clad material and the absorbers made of aluminum alloy. The state of damage due to thermal load of the absorbers is explained. The three-dimensional thermal analysis by finite element method and the thermal load test with 100 keV electron beam on the absorbers of both materials are reported. The improved type absorbers for the AR ceramic chamber are the combination of aluminum alloy absorbers and copper-aluminum absorbers, and the limiting condition of use becomes 6.5 GeV, 50 mA. (K.I.)

[en] Under the collaboration program between CERN and KEK, KEK developed the superconducting quadrupole magnet, MQXA, for the LHC interaction region. This magnet was designed to generate an operating field gradient of 215 T/m in the magnet bore of 70 mm and have an effective magnetic length of 6.37 m. For the four interaction regions of LHC, 16 MQXA magnets will be installed with 16 MQXB magnets, which will be supplied from FNAL. KEK and Toshiba constructed 20 MQXA magnets including 4 spare magnets. For all MQXA magnets, magnetic fields were measured at room temperature, and for the 19 magnets, the routine cold tests at 1.9 K were completed. In this paper, we report the test results magnet performances. (author)