Spectroscopic Study of Soft X-Ray Sources Generated in a Plasma Focus with Neon Gas Puffing

概要

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Soft X-ray emitting spots (hot spots) generated in a plasuna foctrs with a gas ptrffing areinxrestigated trsitag a streak raaode iznaging systetn f'or the soft X-r;ty region and a convex Braggspectrometer which enables tirme resolved naeastrretnent. Using the inaatging systenu, the typicalsize and lifetiune of the hot spots in the foctrsed IICIOII plasnaa were meastrred to be xi ITIIII indiaraaeter, 13 l'lllll in length and with a 5 x 8 ns lif'etime, apjcroxiznately. The ftrll width athalf-maxirntrm of the dtrration of the NeX (12,l9A) Is-2p and NeIX (l3.447A) Is'-1s2p linesrneasured xvith the spectrometer agree with tlaat naeastnred xvith the irnaging system. The softX-ray etnission started in the latter half' of the plastna stmstaining time meastured by visible streakimage and extinguished alrnost at the same tiune as the visible inaage. In the case of neon plasrna,generation of the soft X-rays is not ascribed to the disruption of tlae plasuma column, l.>ut to thegroxvth of the rnacroscopic instabilities in tlae plasrna colutaan. After the disrtrption, the sof'tX-rays are not observed at all. The electron ternperattrre and the density of the hot spots wereestimated by several naethods giving x0.5 keV and in order of 10" /cm', respectively.
社団法人日本物理学会の論文
1999-03-15