A superconducting transport solenoid for Decay Muon Line (D-line) at J-PARC Muon Science Facility was newly designed and manufactured. It was designed to generate a magnetic field in relatively large region (warm bore diameter 0.2 m), while keeping the same outer dimensions, connection interfaces to the existing refrigerator and the power supply of the previous machine [1-3]. Major changes of both solenoids are the reduction of the central magnetic field, the equipment of a warm bore and the adoption of the high T-c current leads. After the installation to the beam line, the initial cooling test, the excitation test and the emergency shutdown test at the rated current were conducted by KEK in order to confirm cryogenic and magnetic performance. These tests were successfully performed with no damege and indicated the solenoid was precisely manufactured and fulfilled the requirements. The solenoid has been under operation since July, 2015. This report describes the design, the manufacturing process, the magnetic field measurement at room temperature and the results of performance tests conducted by KEK.

JAEA successfully completed the manufacture of the toroidal field (TF) insert coil (TFIC) for a performance test of the ITER TF conductor in the final design in cooperation with Hitachi, Ltd. The TFIC is a single-layer 8.875-turn solenoid coil with 1.44-m diameter. This will be tested for 68-kA current application in a 13-T external magnetic field. TFIC was manufactured in the following order: winding of the TF conductor, lead bending, fabrication of the electrical termination, heat treatment, turn insulation, installation of the coil into the support mandrel structure, vacuum pressure impregnation (VPI), structure assembly, and instrumentation. In this presentation, manufacture process and quality control status for the TFIC manufacturing are reported.

A magnetic field design for a superconducting (SC) wiggler system, which has been installed in the Saga light source storage ring, was described. The wiggler is a three-pole type, consisting of a 4.0-T SC center magnet and two normal-conducting side magnets; thus, each pole forms a magnet. Since the wiggler consists of isolated magnets, reduction of the first field integral of the center SC magnet was important from the viewpoint of suppression of the orbit displacement. For this purpose, the center SC magnet was designed to have a separated iron core with field clamps and no transverse return yoke. This concept made magnetic field negative regions near the center peak magnetic field on the electron beam orbit to reduce the first field integral and beam meandering. Heat generations due to eddy currents and the magnetic field due to supporting structures were calculated to have ignorable effects. The appropriateness of the design has been confirmed through daily stable operation at the light source.

A three-pole hybrid wiggler has been developed at the Saga Light Source synchrotron radiation facility. The development goal was to realize a three-pole wiggler with high operational stability and reliability under conditions of limited human resources and maintenance cost. The wiggler consists of a 4 T superconducting main pole and two 1 T normal-conducting side poles. The main pole can generate hard X-rays in the energy range up to approximately 40 keV. Use of the normalconducting side poles ensures significant margins for stationary and transient heat loads on the cryogenic system. The cryocooler cools the superconducting coils and iron poles via mechanical contact without liquid helium. To suppress the beam displacement due to the second integral of the magnetic field of the main pole, the main pole was designed to have relatively large field clamps at both pole ends. The wiggler was manufactured in FY2009 and was installed at the Saga Light Source storage ring in March 2010. Synchrotron radiation from the wiggler was observed at the beam line BL7 in late June 2010. Official user operation of the wiggler started in November 2010. To date, the wiggler has operated stably.

A hybrid three-pole wiggler for generating hard X-rays in the range 4-40 keV was designed for the 1.4-GeV storage ring of a synchrotron radiation facility, i.e., the Saga Light Source. The wiggler consists of a superconducting main pole with a peak field of 4 T and two normal-conducting side poles with peak fields of 1 T. The normal-conducting side poles were used to reduce the heat load on the cryogenic system for the wiggler. A cryogen-free system was used to ensure long-term operational stability of the wiggler system. The superconducting coil and iron poles of the main pole are cooled by a Gifford-McMahon cryocooler via mechanical contact. To suppress the first and second field integrals of the main pole, we designed the main pole with relatively large field clamps and with no transverse return yoke. This pole structure was effective in suppressing beam displacement due to the wiggler field and in reducing the side pole volume. The beam effects due to the multipole fields of the wiggler were estimated and were found to be small or controllable. Based on these results, the storage ring with the designed wiggler is considered to be an effective hard-X-ray source.

OVERVIEW: Development work on the SRC, which is the world’s first ring cyclotron utilizing superconducting technology, for the heavy-ion accelerator RIBF being constructed by RIKEN has now been completed. The SRC is the final booster in the RIBF accelerator complex and is capable of accelerating even heavy ions such as uranium up to 350 MeV/nucleon. Based on its expertise and many years of experience in manufacturing large superconducting magnets, Hitachi, Ltd. was commissioned to develop and fabricate a total of six sector magnets, the most critical subsystem of the SRC. Constituent parts of the sector magnets were completed at the end of March 2003, and after delivery to the site and installation, all superconducting coils achieved their rated current without quenching in the fall of 2005, and the SRC delivered its first beam in December 2006. Shuichi Kido, Dr. Eng. Tomoyuki Semba, Dr. Eng. Takashi Masumoto Yoshiaki Hagiwara Tsunehiko Yamauchi

Since being founded in 1910, Hitachi, Ltd. has been providing a wide lineup of products and services in fields ranging from consumer home electronics to social infrastructure. The corporation has conducted a wide range of activities in the field of particle accelerators as well. This paper describes Hitachi's contributions to the history of accelerator construction, major devices recently handled by Hitachi, and its efforts in developing STF cryomodules as part of recent R&D oriented toward the International Linear Collider (ILC).

A superconducting RF test facility (STF) is being constructed at KEK for R&D oriented toward the International Linear Collider (ILC). Under KEK's guidance, Hitachi, Ltd. has manufactured cryostat components at its factory and completed final assembly in the STF Linac Building at KEK. The STF cryomodule consists of two cryostats, each about six meters long based on the TESLA-TTF-type III design. Each cryostat can house four 9-cell cavities, each one meter in length. This report outlines the flow of manufacturing from the factory to final assembly, and describes the manufacturing of equipment, assembly precision, and other matters.

The authors have developed a solenoid model coil to stabilize the power system in superconducting magnetic energy storage (SMES) system with the aim of drastically reducing system cost. The single solenoid model coil is designed with the rated current, maximum magnetic field and coil charge rates equivalent to those of a practical 100 MW/15 kWh-class SMES using multi-pole solenoid coils. In addition, the coil is characterized by the use of a stabilized Al-NbTi CIC conductor that has a graded structure, layered winding and a high magnetic field with a compact design. To verify coil performance, several tests such as a the measurement of rated current and AC loss, high-speed pulse operation, coil quenching, and insulation characteristics were conducted using a model coil at Kyushu Electric's Imajuku testing center. Test results proved that the SMES model coil performs as well as the initially designed coil, while doing so at a drastically reduced cost.

We participated in the construction of STF (Superconducting RF Test Facility) cryomodule at KEK and conducted several feasibility studies. The cryostats are found to be reliable for this study. This paper describes our recent activities for the ILC.