Abstract
A new beam intensity monitoring system with a wide dynamic range has been designed, fabricated and tested for use at the Holifield Radioactive Ion Beam Facility (HRIBF). Radioactive ion beams produced with this first generation facility will have intensities much lower than those of stable ions previously injected into the 25 URC tandem accelerator and the existing beam current monitoring systems, which have a lower limit of approximately 100 pA, will not be adequate to tune the injection line or accelerator. This paper describes a new system which combines a Faraday cup and a continuous dynode electron multiplier (CDEM) to yield a dynamic range from a few particles per second to greater than a microampere. The CDEM can be biased to count either secondary electrons or Rutherford backscattered ions.
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