Shock wave interaction with pulsed glow discharge and afterglow plasmas

Podder, N. K.; LoCascio, A.C.

doi:10.1016/j.physleta.2009.01.046

Cited by 2 publications

(3 citation statements)

References 24 publications

(40 reference statements)

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“…In addition, PI's group has three more papers have currently been either submitted or being reviewed for publication. 11,12,19 Since the funding of the DOE grant in 2004, a total of eight national-level conference presentations [20][21][22][23][24][25][26][27] -five at the American Physical Society's Division of Plasma Physics (APS-DPP), three at the American Physical Society's Gaseous Electronics Conference (APS-GEC), and one at the IEEE International Pulsed Power and Plasma Science Conference, and eight state-level conference presentations at the Alabama Academy of Science (AAS) meeting have been made.…”

Section: Student Training and Dissemination Of Resultsmentioning

confidence: 99%

“…12 On each run a shock wave was launched into the plasma in order to keep track of the plasma switchon time (t on ) so that the delay time for the shock-launch (Δt = t s -t on ) with respect to t on can be determined. The time evolution of the shock wave profile at various fixed delays is shown in Fig.…”

Section: B Pulsed Plasma Measurementsmentioning

confidence: 99%

“…12 The time evolution of the shock wave profile in the afterglow plasma at various delays is shown in Fig. 8(a).…”

Section: Afterglow Plasma Measurementsmentioning

confidence: 99%

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Experimental Study of Shock Wave Dynamics in Magnetized Plasmas

Podder¹

2009

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In this four-year project (including one-year extension), the project director and his research team built a shock-wave−plasma apparatus to study shock wave dynamics in glow discharge plasmas in nitrogen and argon at medium pressure (1-20 Torr), carried out various plasma and shock diagnostics and measurements that lead to significant progress in understanding shock wave acceleration phenomena in plasmas. Specifically, the team has• completed the construction of spark-discharge shock tube in the first year;• optimized the shock tube over low Mack numbers (Mach 1-4);• built a microwave target plasma and optimized the steady-state plasma condition;• carried out various probe and spectroscopic diagnostics for the dc glow plasma;• launched acoustic shock waves in three different plasma conditions: (i) steady-state, (ii) pulsed or transient, (iii) afterglow plasma;• studied turbulence and the shock wave behaviors in the glow discharge plasmas;• performed a comprehensive set of measurements and computations to increase our understanding of shock-plasma correlation behaviors and improve our understanding of shock acceleration mechanisms in discharge plasmas.The measurements clearly show that in the steady-state dc glow discharge plasma, at fixed gas pressure the shock wave velocity increases, its amplitude decreases, and the shock wave disperses non-linearly as a function of the plasma current. In the pulsed discharge plasma, at fixed gas pressure the shock wave dispersion width and velocity increase as a function of the delay between the switch-on of the plasma and shock-launch. In the afterglow plasma, at fixed gas pressure the shock wave dispersion width and velocity decrease as a function of the delay between the plasma switch-off and shock-launch. These changes are found to be opposite and reversing towards the room temperature value which is the initial condition for plasma ignition case. The observed shock wave properties in both igniting and afterglow plasmas correlate well with the inferred temperature changes in the two plasmas.

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Section: Student Training and Dissemination Of Resultsmentioning

confidence: 99%

Section: B Pulsed Plasma Measurementsmentioning

confidence: 99%

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Experimental Study of Shock Wave Dynamics in Magnetized Plasmas

Podder¹

2009

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Electrical double layers at shock fronts in glow discharges and afterglows

Siefert

2010

Journal of Applied Physics

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Decay of the electron number density in the nitrogen afterglow using a hairpin resonator probe A diagnostic method for real-time measurements of the density of nitrogen atoms in the postglow of an Ar -N 2 discharge using a catalytic probe This paper examines the propagation of spark-generated shockwaves ͑1.0Ͻ MachϽ 2.0͒ into argon and nitrogen glow discharges and their afterglow. Diagnostic methods were employed and expanded in order to capture the dynamics of the shock front in these weakly-ionized, nonmagnetized, collisional plasmas. We used a microwave hairpin resonator to measure the electron number density, and, for all cases, we measured an increase in the electron number density at the shock front. By comparing the increase in electron number density at the shock front in the active discharge and in the afterglow, we conclude that electrons with a temperature much greater than room temperature can be compressed at the shock front. The ratio of electron number density before and after the shock front can be approximately predicted using the Rankine-Hugoniot relationship. The large gradient in electron density, and hence a large gradient in the flux of charged species, created a region of space-charge separation, i.e., a double layer, at the shock front. The double layer balances the flux of charged particles on both sides of the shock front. The double layer voltage drop was measured in the current-carrying discharge using floating probes and compared with previous models. As well, we measured argon 1s 5 metastable-state density and demonstrate that metastable-state neutral species can be compressed across a shock front and approximately predicted using the Rankine-Hugoniot relationship.

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Shock wave interaction with pulsed glow discharge and afterglow plasmas

Cited by 2 publications

References 24 publications

Experimental Study of Shock Wave Dynamics in Magnetized Plasmas

Experimental Study of Shock Wave Dynamics in Magnetized Plasmas

Electrical double layers at shock fronts in glow discharges and afterglows

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