An intense pulsed light-ion beam generator, “ETIGO-1”, has been constructed at the Technological University of Nagaoka. In a preliminary stage of experiments done at less than half full power, we produced V
d (diode voltage)∼760 kV, I
d (diode current)∼65 kA, I
i (ion current)∼14 kA by use of a spherically-shaped, magnetically-insulated diode. Using a geometric focussing technique, we have obtained maximum current density J
i∼4 kA/cm2 (at the focussing point), yielding a focussing gain of ∼50. The focussing spot is observed to be less than 10 mm in diameter. The extracted ion current exceeds by more than a factor of 3 the spacecharge-limiting current of ions.
Dynamics of an intense pulsed proton beam have been studied by measuring nuclear reactions as well as by a biased ion-collector (BIC). When the ion-current density (J
i) is small such that J
i<30 A/cm2, the proton number measured by BIC is in good agreement with that by nuclear activation. Good linearity exists between time integrated γ-ray signal and proton number measured by the activation. Hence, it would be possible to obtain the proton number quantitatively even when a target "blow-off" takes place at J
i>1 kA/cm2. Prompt γ-ray is also measured by the time-of-flight method to yield reasonable agreement with the applied peak potential.
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