Abstract
It is widely recognized that non-destructive mea- surement at high resolution of the DC current of high-energy heavy-ion beams is important. Therefore, a high critical tem- perature (HTc) superconducting quantum interference de- vice (SQUID) beam current monitor has been developed for use in the radioactive isotope beam factory (RIBF) at RIKEN in Japan. Unlike at other existing facilities, a low- vibration, pulse-tube refrigerator cools the HTc fabrications including the SQUID in such a way that the size of the sys- tem is reduced and the running costs are lowered. As a re- sult, using a prototype of the HTc SQUID monitor, the inten- sity of a 1 µA Xe beam (50 MeV/u) was successfully mea- sured with 100 nA resolution. Furthermore, since a higher resolution is necessary, development of an improved HTc current sensor with two coils has begun. A spraying ma- chine was developed to fabricate the new HTc current sen- sor by dip-coating a thin layer of Bi2-Sr2-Ca2-Cu3-Ox (Bi- 2223) onto a 99.6 % MgO ceramic substrate. Results from a new HTc current sensor produced using this machine are reported here.
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