High-density fusion and the Z-pinch

Abstract

The formation of a Z-pinch in dense gas is investigated using numerical modeling in 1-and 2-dimensions. Hot, dense Z-pinches are calculated with n e 2 X 1021 cm3 and T = 10 keV. Relaxation by Sausage instability of an unstable pinch profile to a marginally stable one is calculated along with end losses in 2-dimensions to show that if plasma is confined for N = 50 to 200 sound transits across the radius a, pinches with length L = Na are of interest for fusion power. A conceptual, "no-wall ' fusion reactor is discussed.

Construction of a correlated physical and genetic map of the Klebsiella pneumoniae hisDGO region using transposon Tn5 mutagenesis.

“…The biosynthesis of histidine in Salmonella typhimurium and Escherichia coli is catalysed by nine enzymes, coded for by a cluster of nine genes arranged in an operon (Hartman et al, 1971;Blasi and Bruni, 1981). The order of the nine his genes is the same in S. typhimurium and in E. coli.…”

“…In contrast to the his operons of S. typhimurium and E. coli, the his region of Klebsiella pneumoniae has not been extensively characterized, although it is likely that it will contain a his operon structurally and functionally similar to the analogous S. typhimurium and E. coli operons. The K. pneumoniae hisD and hisG genes, coding for enzymes involved in the last and first steps of the histidine biosynthetic pathway (Hartman et al 1971), as well as the his operon regulatory region, are located immediately adjacent to the nif (nitrogen fixation) gene cluster (Streicher et al, 1972;Dixon and Postgate, 1972;see Figure 1). K. pneumoniae DNA fragments carrying the hisD and hisG structural genes, the hisO(P) 'Present address: Department of Molecular Biology, Massachusetts General Hospital, Jackson Research Building, Boston, MA 02114.…”

Dense Z-pinch (DZP) as a fusion power reactor: preliminary scaling calculations and sysems energy balance

“…, Ggg is given by Eq. (21)• The function g(6) decreases rapidly with decreasing values of 6 EQ (i.e., with increasing icOND^* For tne case when Qrin " 1 (i.e., fcOND ™ ^' g(9) K 5 -1 as 8 approaches unity (i.e., Dependence of thermonuclear yield, W T (( Eq . (24)), and the function g(6) (Eq.…”