NDLI: High performance repetitive low energy miniature plasma focus neutron source: Record yield, scaling laws and yield stability

Content Provider	IEEE Xplore Digital Library
Author	Verma, R. Rawat, R.S. Lee, P. Springham, S.V. Tan, T.L.
Copyright Year	2011
Description	Author affiliation: Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, Singapore-637616 (Verma, R.; Rawat, R.S.; Lee, P.; Springham, S.V.; Tan, T.L.)
Abstract	The research and development of compact repetitive miniature plasma focus devices, with stored energy from few tens to few hundred joules, is becoming increasingly important because of their potential applications as portable neutron source for explosive and contraband material detection. In this paper, we report the neutron emission results from our most updated version of Fast Miniature Plasma Focus device, namely FMPF-3. The FMPF-3 (2.4 µF, 34 nH, 103 kA @ 14.0 kV, T/4 ∼460 ns) is an advanced prototype of previous versions of FMPF series which achieves higher performance through the use of four parallel pseudo-spark gap switches for each module instead of single switch used in FMPF-2. This lead to the lower system impedance and hence higher discharge current with further enhancement in neutron to record time average yield of $(1.2±0.2)×10^{7}$ neutrons/sec at 10Hz operation. The analysis of experimental data for plasma focus devices with stored bank energies of 400 J to 1 MJ showed the neutron yield scaling with peak discharge current as $Yn∼I^{3.9}.$ The scaling law at the lower energy limits of 120 – 235 J for FMPF-3 was found to scale on higher side as $Y∼I^{6.9}.$ The shot to shot stability of neutron emission was tested at different repetition rates from 1 to 10 Hz for shot sequence of 50 shots. It was realized that if the device is operated at the pressure optimized for single shot operation then the neutron yield decreases monotonously after about 30 shots. The increase in operating deuterium pressure lead to the stabilization of neutron yield for 50 shot sequence for repetitive operations. In addition to above results, the paper will also discuss briefly the conceptualization and development of FMPF-3, along with key technical and physical issues and challenges encountered.
Starting Page	1
Ending Page	1
File Size	51815
Page Count	1
File Format	PDF
ISBN	9781612843308
ISSN	07309244
e-ISBN	9781612843292
e-ISBN	9781612843285
DOI	10.1109/PLASMA.2011.5992988
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	Neutrons
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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