DocumentCode :
3334960
Title :
Post-hole convolute studies on the Z machine at SNL and maize at U of M
Author :
Gomez, M.R. ; Gilgenbach, R.M. ; Zier, J.C. ; French, D.M. ; Patel, S. ; Lau, Y.Y. ; Cuneo, M. ; Lopez, M. ; Mazarakis, M. ; Bailey, J. ; Rochau, G. ; Lake, P.
Author_Institution :
Nucl. Eng. & Radiol. Sci. Dept., Univ. of Michigan -Ann Arbor, MI, USA
fYear :
2010
fDate :
20-24 June 2010
Firstpage :
1
Lastpage :
1
Abstract :
Summary form only given. Post-hole convolutes are used to combine the current from several magnetically insulated transmission lines into one anode-cathode gap. The post-hole convolute geometry produces a complex magnetic field, which can contain several magnetic nulls. Electron flow in the post-hole region can cross the anode-cathode gap, which can produce plasma and lead to further current losses.A streaked spectroscopy diagnostic has recently been set up to observe plasma emission at Sandia´s Z Machine. The diagnostic is fiber-optically coupled to the experimental hardware, allowing the diagnostic to measure light in the visible spectrum (~ 400 nm to ~ 700 nm). Hardware has been designed to observe the light emitted by the plasma forming in the post hole region. Experimental shots are planned for late winter / early spring. Single post-hole convolute experiments on the 1 MA Michigan Accelerator for Inductive Z-pinch Experiments (MAIZE) are also being conducted. These experiments utilize a static load, which allows 10´s of shots per hour. The current flowing into and out of the convolute is monitored in order to determine the current lost in the post hole region. Visible spectroscopy of the plasma formed will be used to infer a temperature. Different components of the convolute are made from different materials allowing the plasma source to be observed spectroscopically Laser imaging will be used to determine the electron density and closure velocity of the plasma. MAGIC PIC 3D simulations of the post-hole convolute fielded on MAIZE predicted plasma formation at a magnetic null in the convolute. Light emission was observed experimentally from the predicted region using an open pinhole camera. Results from experiments as well as simulations will be presented.
Keywords :
Z pinch; plasma density; plasma diagnostics; plasma simulation; plasma sources; plasma transport processes; MAGIC PIC 3D simulation; MAIZE; Sandia Z Machine; Z-pinch; anode-cathode gap; current 1 MA; current flow; electron density; electron flow; laser imaging; magnetically insulated transmission lines; open pinhole camera; plasma emission; plasma source; plasma velocity; post-hole convolute geometry; single post-hole convolute experiment; streaked spectroscopy diagnostic; visible spectrum measurement; Hardware; Plasma accelerators; Plasma density; Plasma diagnostics; Plasma materials processing; Plasma measurements; Plasma simulation; Plasma sources; Plasma temperature; Spectroscopy;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Plasma Science, 2010 Abstracts IEEE International Conference on
Conference_Location :
Norfolk, VA
ISSN :
0730-9244
Print_ISBN :
978-1-4244-5474-7
Electronic_ISBN :
0730-9244
Type :
conf
DOI :
10.1109/PLASMA.2010.5534343
Filename :
5534343
Link To Document :
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