We have developed a delay-line parallel-plate avalanche counter (PPAC) with
high detection efficiency for high-energy light ions. A large signal-to-no
ise ratio was achieved by a newly designed pre-amplifier and the usage of C
3F8 gas at a pressure of 30 Torr. The counter has been tested with beams of
90 A MeV (7) Li at RIKEN, 340 A MeV (12) C at GSI, and 254 A MeV B-8 at GS
I. We achieved high detection efficiencies (> 95%) for all of these ions. F
urthermore, we achieved reasonable position and timing resolutions. (C) 200
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