NDLI: Multi-color gated x-ray pinhole imaging of Z-pinch implosions on the Saturn and Z pulsed power generators

Content Provider	IEEE Xplore Digital Library
Author	Jones, B. Nielsen, D.S. Nielsen-Weber, L.B. Serrano, J.D. Meyer, C.J. Coverdale, C.A. Ampleford, D.J. Jennings, C.A. Hansen, S.B. Cuneo, M.E. Apruzese, J.P. Clark, R.W. Coleman, P.L.
Copyright Year	2011
Description	Author affiliation: Sandia National Laboratories, Albuquerque NM 87185, USA (Jones, B.; Nielsen, D.S.; Nielsen-Weber, L.B.; Serrano, J.D.; Meyer, C.J.; Coverdale, C.A.; Ampleford, D.J.; Jennings, C.A.; Hansen, S.B.; Cuneo, M.E.) \|\| L3 Communications, USA (Apruzese, J.P.) \|\| Alameda Applied Sciences Corp., USA (Coleman, P.L.) \|\| Berkeley Scholars, USA (Clark, R.W.)
Abstract	Magnetically driven implosions of wire array and gas puff loads on the 20 MA Z and 8 MA Saturn pulsed power drivers provide extremely intense x-ray sources. Each facility fields multi-frame, multi-color, x-ray pinhole cameras in order to assess source uniformity and study implosion dynamics. The instruments feature cameras filtered for >1 keV photons, as well as pinhole cameras in which <1 keV images are reflected from planar multilayer mirror (MLM) $monochromators^{1}.$ Microchannel plate cameras provide <1 ns time resolution, and spatial resolutions of 100–500 µm are typical when imaging >10-mm-scale z pinches. A Cr/C MLM on the Z machine is used routinely for 277 eV monochromatic imaging with <10 eV bandwidth, showing a broad shell of imploding wire array plasma which generates 1–10 keV K-shell x-rays when it stagnates on the axis of symmetry. After peak x-ray power, an m=1 instability is seen to grow rapidly, followed by the pinch column breaking and disrupting late in time. This 277 eV imager may also be used for hohlraum hole closure measurements on Z. A W/Si mirror reflecting 528 eV images corresponding to an L-shell emission line of Ar has been demonstrated in Saturn gas puff experiments. A zippered implosion is observed, with K line emission generated as the plasma arrives on axis, and L-shell radiation following as the plasma cools. Collisional radiative modeling may be employed to understand line and continuum contribution to the imaged signal, and to generate synthetic images.
Starting Page	1
Ending Page	1
File Size	54904
Page Count	1
File Format	PDF
ISBN	9781612843308
ISSN	07309244
e-ISBN	9781612843292
e-ISBN	9781612843285
DOI	10.1109/PLASMA.2011.5993241
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-26
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Laboratories Saturn Magnetic resonance imaging Generators X-ray imaging Photonics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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