[其它]86 DEVELOPMENT OF A 12 CM DIAMETER NOZZLE FOR ARGON ZPINCHES ON THE DECADE QUAD

DEVELOPMENT OF A 12 CM DIAMETER NOZZLE FOR ARGON ZPINCHES ON THE DECADE QUAD [m#NfA:h,  
P. L. Colemanx, A. Bixler, A. Gerhan, M. Krishnan, J. Thompson and K. Wilson Z3;=w%W  
Alameda Applied Sciences, Inc.2235 Polvorosa Ave., Suite 230 > V%Q O>C  
San Leandro, CA 94577 USA " i`8l.Lc  
* Work supported by the US Defense Threat Reduction Agency under contract DTRA01-99-D-0043. qi\n]I  
x email: coleman@aasc.net \y~)jq:d"  
Abstract fM":f| G  
We report on the initial tests of a large diameter (12 cm) P\(30  
double shell nozzle designed for use with the 300 ns risetime &o.iUk  
current pulse (> 6 MA) of the DECADE QUAD I:&# U$  
(DQ) pulsed power machine. The nozzle employs unique uPU#c\  
features to simplify construction, enhance gas flow bXvbddu)}  
reproducibility, and reduce fabrication costs. With a large mw+j|{[  
4 cm recess, the gas flow at the pinch location is well el*9 Ih  
collimated and nearly a uniform fill, a flow condition that Gpu_=9vzv  
has been shown [1] to give better output than shell-like l2/@<0P  
flows for gas z-pinches. fv?45f  
Results with this nozzle on the Double Eagle simulator {j@+h%sF>+  
indicate that such long implosion time pinches are not 2Ow<`[7  
hopelessly unstable. K-shell emission is at the levels =J3`@9;  
expected from empirical scaling at other peak currents and ,y.3Fe  
implosion times. The overall morphology (pulse width Phlk1*1n  
and spatial extent) of the pinch can be varied from tight V/-MIH7SF  
and concentrated to broad and extended by the choice of Wo3'd|Y~i  
relative pressures in the plenums that drive the two nozzle (j N]OE^  
shells. /djACA  
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