|WEPP07 ポスターセッション① 9月2日 ポスター会場 12:40-14:40|
|Extraction Study of High-Temperature Superconducting Skeleton Cyclotron (HTS-SC) for BNCT and Radioisotope Production|
○Hui Wen Koay, Mitsuhiro Fukuda, Hiroki Kanda, Tetsuhiko Yorita (RCNP)
This work discusses a preliminary design as well as the beam dynamics of the extraction of a High-Temperature Superconducting Skeleton Cyclotron (HTS-SC). In previous works, HTS-SC with an extraction radius of 40 cm was proposed as a compact and high-current accelerator providing 50 MeV H+ beams required by Boron Neutron Capture Therapy (BNCT) as well as radioisotopes production in a hospital environment. In order to avoid Lorentz stripping effect which leads to possible beam loss up to 50% for negative ion acceleration, an H+ beam was adopted, together with an electrostatic deflector extraction in HTS-SC. However, small final-turn separation and significant space charge effect of such a compact machine remains as a challenge to achieve a high extraction efficiency. Therefore, in order to improve the extraction efficiency of HTS-SC, the beam loss upon colliding with a septum electrode of a deflector is minimized by performing an extensive orbit analysis of extraction beam dynamics. Besides, both resonant (precessional) and resonant-free extraction are also considered in order to determine the most efficient system in providing an extracted beam with desired quality.