A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z  

Sasaki, Y.

Paper Title Page
WE-05 Development of Beam Current Monitor with HTS SQUID and HTS Current Sensor 109
 
  • T. Watanabe, N. Fukunishi, M. Kase, Y. Sasaki, Y. Yano
    RIKEN, Wako
 
 

A high­ly sen­si­tive beam cur­rent mon­i­tor with an HTS (High-Tem­per­a­ture Su­per­con­duct­ing) SQUID (Su­per­con­duct­ing QUan­tum In­ter­fer­ence De­vice) and an HTS cur­rent sen­sor, that is, an HTS SQUID mon­i­tor, has been de­vel­oped for use of the RIBF (RI beam fac­to­ry) at RIKEN. Un­like other ex­ist­ing fa­cil­i­ties, the HTS SQUID mon­i­tor al­lows us to mea­sure the DC of high-en­er­gy heavy-ion beams non­de­struc­tive­ly in real time, and the beam cur­rent ex­tract­ed from the cy­clotron can be record­ed with­out in­ter­rupt­ing the beam user's ex­per­i­ments. Both the HTS mag­net­ic shield and the HTS cur­rent sen­sor were dip-coat­ed to form a Bi2 - Sr2 - Ca2 - Cu3 - Ox (Bi-2223) layer on 99.9 % MgO ce­ram­ic sub­strates. In the pre­sent work, all the fab­ri­cat­ed HTS de­vices are cooled by a low-vi­bra­tion pulse-tube re­frig­er­a­tor. These tech­nolo­gies en­abled us to down­size the sys­tem. Prior to prac­ti­cal use at the RIBF, the HTS-SQUID mon­i­tor was in­stalled in the beam trans­port line of the RIKEN ring cy­clotron to demon­strate its per­for­mance. As a re­sult, a 20 μA 40Ar15+ beam in­ten­si­ty (63 MeV/u) was suc­cess­ful­ly mea­sured with a 500 nA res­o­lu­tion. De­spite the per­for­mance tak­ing place in an en­vi­ron­ment with strong gamma ray and neu­tron flux ra­di­a­tions, RF back­ground and large stray mag­net­ic fields, the mea­sure­ments were suc­cess­ful­ly car­ried out in this study. This year, the HTS SQUID mon­i­tor was up­grad­ed to have ares­o­lu­tion of 100 nA and was re­in­stalled inthe beam trans­port line, en­abling us to mea­sure a 4 μA 132Xe20+ (10.8 MeV/u) beam and a 1 μA 132Xe41+ (50.1 MeV/u) beam used for the ac­cel­er­a­tor op­er­a­tions at RIBF. Hence, we will re­port the re­sults of the beam mea­sure­ments an the pre­sent sta­tus of the HTS SQUID mon­i­tor.

 

slides icon

Slides