High-power rotating wheel targets at RIKEN

Atsushi Yoshida, Kosuke Morita, Kouji Morimoto, Daiya Kaji, Toshiyuki Kubo, Yutaka Takahashi, Akira Ozawa, Isao Tanihata

Research output: Contribution to journalConference article

14 Citations (Scopus)

Abstract

Two kinds of rotating wheel targets for high-power heavy ion reaction have been developed. One is a thick disk target with water-cooling being developed for the in-flight RI beam separator (BigRIPS). An in-beam test was performed using 40Ar beam at 24AMeV, 1.9particle μA, with the beam spot size 3mm in diameter, resulting 0.25GW/m2 beam power stopped at the surface of carbon disk 2mm in thickness and 260mm in diameter. It performed stably without melting. A simulation study has been developed and its possibility for the use of BigRIPS is discussed. The second is a thin target foil mounted on a wheel disk which rotates in He cooling gas of 13.32-133.2Pa. Its main use is in fusion reactions to search for super-heavy elements by using the gas-filled recoil separator (GARIS). A typical foil is Pb or Bi of 200-300μg/cm2 in thickness evaporated onto a carbon backing foil of 30μg/cm2 thickness, and covered by evaporated carbon of 10μg/cm2 thickness. It can withstand long use under high-intensity 64Ni beam at 311MeV, and 0.5particle μA.

Original languageEnglish
Pages (from-to)65-71
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume521
Issue number1
DOIs
Publication statusPublished - Mar 21 2004
Externally publishedYes
EventAccelerator Target Technology for the 21st Century. Proceeding - Argonne, IL., United States
Duration: Nov 4 2002Nov 8 2002

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All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Nuclear and High Energy Physics

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