NDLI: Plasma formation and evolution on a copper surface driven by megaampere current pulse

Content Provider	IEEE Xplore Digital Library
Author	Yates, K.C. Bauer, B.S. Fuelling, S. Ivanov, V.V. Altemara, S.D. Papp, D. Anderson, A.A. Wurden, G.A. Awe, T.J. Bauer, R.S.
Copyright Year	2013
Description	Author affiliation: Univ. of Nevada, Reno, NV, USA (Yates, K.C.; Bauer, B.S.; Fuelling, S.; Ivanov, V.V.; Altemara, S.D.; Papp, D.; Anderson, A.A.)
Abstract	Summary form only given. Copper and aluminum mm-diameter rods have been driven by a mega-ampere current pulse at UNR's Nevada Terawatt Facility. The facility's z-pinch delivers 1 M A in ~100 ns producing megagauss surface magnetic fields that diffuse into the skin layer, ohmically heating the load and causing plasma formation. The load radius is designed such that it is in the “thick wire” regime; the radius is much thicker than the skin depth. With the novel “barbell” design of our loads, plasma formation due to arcing or electron avalanche is avoided, allowing for the study of ohmically heated loads. Work presented here will show first evidence of a magnetic field threshold for plasma formation in copper and compare with previous work done with $aluminum^{1}.$ Similarities and differences between these metals will be presented, giving motivation for continued work with different material loads. During the current rise, the metal is heated to temperatures that cause multiple phase changes. When the surface magnetic field reaches a threshold, the metal ionizes and the plasma becomes pinched against the underlying cold liquid metal. Diagnostics fielded include visible light radiometry, two-frame shadowgraphy in both 266 and 532 nm wavelengths, 266 nm interferometry, time gated EUV spectroscopy, 12-frame/5 ns gated imaging, and single frame/2 ns gated imaging with an ICCD camera. Surface temperature, expansion speeds, instability growth, time of plasma formation and plasma uniformity are determined from the data. The interplay between an ohmically heated conductor and a magnetic field is important for the field of Magnetized Target Fusion (MTF). MTF compresses a magnetized fuel by imploding a flux conserving metal liner. During compression, fields reach several megagauss, with a fraction of the flux diffusing into the metal liner. The magnetic field induces eddy currents in the metal, leading to ionization and potential mixing of metal contaminant into the fusion fuel.
Starting Page	1
Ending Page	1
File Size	113403
Page Count	1
File Format	PDF
ISBN	9781467351713
ISSN	07309244
DOI	10.1109/PLASMA.2013.6633214
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-16
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Plasmas Magnetic fields Heating Copper Logic gates Laboratories
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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