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An atmospheric-pressure, high-aspect-ratio, cold micro-plasma.

Lu X, Wu S, Gou J, Pan Y - Sci Rep (2014)

Bottom Line: The electron density of the plasma plume estimated from the broadening of the Ar emission line reaches as high as 3 × 10(16) cm(-3).The sheath thickness of the plasma could be close to the radius of the plasma.The ignition voltages of the plasma increase one order when the radius of the dielectric tube is decreased from 1 mm to 3 μm.

View Article: PubMed Central - PubMed

Affiliation: 1] State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, P.R. China [2] IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, P.R. China.

ABSTRACT
An atmospheric pressure nonequilibrium Ar micro-plasma generated inside a micro-tube with plasma radius of 3 μm and length of 2.7 cm is reported. The electron density of the plasma plume estimated from the broadening of the Ar emission line reaches as high as 3 × 10(16) cm(-3). The electron temperature obtained from CR model is 1.5 ev while the gas temperature of the plasma estimated from the N2 rotational spectrum is close to room temperature. The sheath thickness of the plasma could be close to the radius of the plasma. The ignition voltages of the plasma increase one order when the radius of the dielectric tube is decreased from 1 mm to 3 μm.

No MeSH data available.


The discharge current and applied voltage waveforms of the plasma plume.(a) Multiple current pulses. (b) Single discharge current pulse.
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f2: The discharge current and applied voltage waveforms of the plasma plume.(a) Multiple current pulses. (b) Single discharge current pulse.

Mentions: The discharge current-voltage waveforms are shown in Fig. 2. One current pulse in each half cycle of applied voltage is observed, as shown in Fig. 2(a). But the amplitude and the onset time of the discharge current are not constant. The peak value of the discharge current pulse is 0.1 ~ 0.25 A. Figure 2(b) shows a single discharge current pulse. The full width at half maximum of the current pulse is about 30 ns. Importantly, the power needed to sustain the plasma plume was only about 1.8 W. However, the peak current density and the power density of the plasma plume were as high as ~3.5 ~ 8.8 × 105 A·cm−2 and 2.3 × 106 W·cm−3, respectively.


An atmospheric-pressure, high-aspect-ratio, cold micro-plasma.

Lu X, Wu S, Gou J, Pan Y - Sci Rep (2014)

The discharge current and applied voltage waveforms of the plasma plume.(a) Multiple current pulses. (b) Single discharge current pulse.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4265786&req=5

f2: The discharge current and applied voltage waveforms of the plasma plume.(a) Multiple current pulses. (b) Single discharge current pulse.
Mentions: The discharge current-voltage waveforms are shown in Fig. 2. One current pulse in each half cycle of applied voltage is observed, as shown in Fig. 2(a). But the amplitude and the onset time of the discharge current are not constant. The peak value of the discharge current pulse is 0.1 ~ 0.25 A. Figure 2(b) shows a single discharge current pulse. The full width at half maximum of the current pulse is about 30 ns. Importantly, the power needed to sustain the plasma plume was only about 1.8 W. However, the peak current density and the power density of the plasma plume were as high as ~3.5 ~ 8.8 × 105 A·cm−2 and 2.3 × 106 W·cm−3, respectively.

Bottom Line: The electron density of the plasma plume estimated from the broadening of the Ar emission line reaches as high as 3 × 10(16) cm(-3).The sheath thickness of the plasma could be close to the radius of the plasma.The ignition voltages of the plasma increase one order when the radius of the dielectric tube is decreased from 1 mm to 3 μm.

View Article: PubMed Central - PubMed

Affiliation: 1] State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, P.R. China [2] IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, P.R. China.

ABSTRACT
An atmospheric pressure nonequilibrium Ar micro-plasma generated inside a micro-tube with plasma radius of 3 μm and length of 2.7 cm is reported. The electron density of the plasma plume estimated from the broadening of the Ar emission line reaches as high as 3 × 10(16) cm(-3). The electron temperature obtained from CR model is 1.5 ev while the gas temperature of the plasma estimated from the N2 rotational spectrum is close to room temperature. The sheath thickness of the plasma could be close to the radius of the plasma. The ignition voltages of the plasma increase one order when the radius of the dielectric tube is decreased from 1 mm to 3 μm.

No MeSH data available.