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The proton emission from the plasma focus device with the H2 filling was analyzed. The ion beam characteristics, particle pinhole image and pinch plasma image were obtained with an aluminum filtered pinhole camera with CR-39 film and x-ray pinhole camera with Be filter respectively. Ring-shaped of ion bunches were observed and also on the pinched plasma column same shape was attributed.
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Yousefi et al. (2007) studied this question.
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