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The SRC is cooled down and excited without quenches, where the mechanical support structure and the cryogenic cooling system have worked properly. Acceleration cavity, vacuum system and beam diagnostic system are installed and tested under the stray fields arising from the sector magnets.

The cool-down and excitation results of the superconducting ring cyclotron (SRC) sector magnets are presented. Results suggest that all coils were fully excited on 11/7 without quench and all the main coils transited to superconducting phase on 10/13.

K2500-superconducting ring cyclotron with 6-sectors is being constructed at RIKEN as one of the energy booster of the existing K540 ring cyclotron. The magnet reached the designed field with one quench and training effect are clearly observed, which show that it would works well to inject the beam into the superco9nductivity cyclotron.

The sector magnets of the K2500-MeV Superconducting Ring Cyclotron (SRC), which is under construction for the RIKEN RI Beam Factory, are described. The SRC consists of six sector magnets, four rf resonators, etc. Each sector magnet is 7.2 m in length and 6 m in height and 800 t (metric ton) in weight; the sector angle is 25 deg. The required maximum magnetic field is 3.8 T. The superconductor for the main and trim coil has a rectangular shape (8 mm by 15 mm) consisting of a Rutherford-type NbTi cable located at the center of an Al-alloy stabilizer housing. The main coil is bath-cooled and the trim coil is indirectly cooled. Each component of the sector magnet as well as the cryogenic cooling system was completed in the spring of 2003. [ABSTRACT FROM AUTHOR]