NDLI: A weak over-driven detonation mode for laser-produced plasma

Content Provider	IEEE Xplore Digital Library
Author	Shimamura, K. Ofosu, J.A. Fukunari, M. Komurasaki, K.
Copyright Year	2013
Description	Author affiliation: Dept. of Adv. Energy, Univ. of Tokyo, Kashiwa, Japan (Shimamura, K.; Ofosu, J.A.; Fukunari, M.; Komurasaki, K.)
Abstract	Summary form only given. Propagation process of the laser absorption wave was introduced by analysis of one dimensional steady state flow with heat interaction. The shock wave is sufficiently strong so that the shocked heated gas is hot enough to begin absorbing the laser irradiation. This is an analog of the chemical detonation wave that can be viewed as a shock followed by a strong deflagration. However, the velocity given by a Chapmann-Jouguet relation does not agree with the measurements. Raizer suggested that some-nonhydrodynamic ionization-mechanism is more dominant than the shock wave, from the analog of overdriven detonation. Overdriven detonation is categorized into strong and weak detonation, and a pressure-specific volume (p-V) diagram can describe these situations with a Hugoniot curve, a Rayleigh line and a shock adiabatic curve. Strong-overdriven detonation occurs in the presence of additional external agency acting on the gas, such a supersonic piston. However, it is difficult to show a von-Neumann spike on the shock adiabatic curve because there is no piston in this case. The weak-overdriven detonation wave is a suitable situation for the laser absorption wave because the laser-absorption occurs ahead and afterwards behind the shock wave. The pressure increases continuously from the preionized layer to the back surface of the laser absorption layer. To investigate the LSD states following the theory of chemic al detonation, the shadowgraph visualization and pressure measurement are utilized for the laser-supported detonation. As a result, the pressure of plasma front is 6-8 atm using the rarefaction theory. The velocity of laser-detonation was less than 3,000 m/s. The p-V diagrams drawn by experimental results reveal that the laser-detonation is the over-driven detonation state and chooses the weak-solution. The reason being that, the plasma expansion plays a role as piston that pushes the shock wave during high laser irradiation. Furthermore, the heating layer is broadened in front of and behind the shock wave. The weak solution is possible because the compression is continuous from the front surface of the plasma layer until the back surface.
Starting Page	1
Ending Page	1
File Size	121713
Page Count	1
File Format	PDF
ISBN	9781467351713
ISSN	07309244
DOI	10.1109/PLASMA.2013.6634786
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	Laser theory Chemical lasers Shock waves Plasmas Gas lasers Absorption Electric shock
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