Abstract
A three-stage bunching system has been constructed for use with a Lamb-shift polarized ion source. The first stage consists of a linear voltage ramp of approximately 100 V peak-to-peak applied to the anode of the duoplasmatron. This voltage ramp prebunches the beam at 4 or 2 MHz into bursts approximately 70 ns wide. The beam is compressed further with a two-stage double-drift buncher system. With this system we have been able to transport 75% of the dc beam to the target and bunch up to 90% of this beam into pulses approximately 2.0 ns wide (fwhm). Average pulsed currents of up to 150 nA have greatly enhanced our capability to perform ( p , n), ( d , n), ( n , n) and ( n , γ) experiments.
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