Propagation of a Positive Streamer Toward a Dielectric Tip in Pure Nitrogen and in Air Under Voltage Pulses With Subnanosecond Rise Time

Dubinova, Anna; Teunissen, Jannis; Ebert, Ute

doi:10.1109/tps.2014.2360314

Cited by 2 publications

(1 citation statement)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, it is interesting to note that no cathode layer was observed from the streak images, although the spatial resolution is about 2 μm. The most probable reason for the absence of a cathode layer is the continuous production of free electrons due to photoionisation, which plays an important role in air discharges [29].…”

Section: Resultsmentioning

confidence: 99%

Double-propagation mode in short-gap spark discharges driven by HV pulses with sub-ns rise time

Höft

Becker

Kolb

et al. 2020

Plasma Sources Sci. Technol.

View full text Add to dashboard Cite

The object of this study is the investigation of spark discharges ignited by unipolar positive rectangular high voltage (HV) pulses with 200 ps rise time and (15 ± 2) kV amplitude with 3 ns duration full width at half maximum in synthetic air in a 1.2 mm pin-to-pin gap (tungsten electrodes) at atmospheric pressure. The discharge development was recorded by synchronised iCCD and streak camera measurements in single-shot operation, revealing a two-stage propagation mode. The discharge started with a fast initial breakdown across the entire gap (∼10 mm ns−1) during the HV slope, followed by a much slower (∼0.1 mm ns−1) propagation originating from both electrodes towards the gap centre. The combination of high-resolution diagnostics with numerical modelling indicated that the initial breakdown phase is caused by the rapid increase of electric field strength during the steep HV slope, which leads to the simultaneous fast propagation of a positive and a negative streamer.

show abstract

Section: Resultsmentioning

confidence: 99%

Double-propagation mode in short-gap spark discharges driven by HV pulses with sub-ns rise time

Höft

Becker

Kolb

et al. 2020

Plasma Sources Sci. Technol.

View full text Add to dashboard Cite

show abstract

Numerical simulation of dynamics behavior of pre-ionized pulsed-DC helium plasma jets at atmospheric pressure

Liu,

Yin,

et al. 2024

Physics of Plasmas

View full text Add to dashboard Cite

A two-dimensional axisymmetric fluid model was established to investigate the dynamic behavior of pre-ionized pulsed-direct-current helium plasma jets at atmospheric pressure. Our simulation results show that, at a relatively low pre-ionization level, the electron number density is reduced and the streamer propagation is decelerated before the plasma jet is ejected from the tube, which is attributed to the inhibitory effect of a recombination process between the positive ions in the streamer and the seed electrons near the anode. As the pre-ionization reaches a relatively high level, the electron number density is larger than that without pre-ionization before the plasma jet is ejected from the tube, which originates from the promotion effect of decreased breakdown voltage. These two competing mechanisms jointly dominate the dynamic behavior of gas discharge in the presence of pre-ionization. After the plasma jet is ejected from the tube, the enhanced discharge power is responsible for the strengthened electric field in the streamer head, augmented total ionization rate, accelerated streamer propagation, and increased number density of electrons and active species, whatever the pre-ionization density is. With the increase in pre-ionization density, the plasma jet length, streamer propagation speed, discharge power, and discharge energy exhibit the initial increase and subsequent decrease variation trend. The optimal enhancement effect is obtained at the pre-ionization density of 6 × 1012 m−3, with the plasma jet lengthened by 28.4% and the energy deposition efficiency enhanced by 28.1%.

show abstract

Propagation of a Positive Streamer Toward a Dielectric Tip in Pure Nitrogen and in Air Under Voltage Pulses With Subnanosecond Rise Time

Abstract: We simulate a positive streamer discharge approaching a dielectric tip (e.g., of a dielectric rod) under a voltage pulse with a subnanosecond rise time. In air, the streamer reaches the tip, whereas in nitrogen, it does not.

Cited by 2 publications

References 5 publications

Double-propagation mode in short-gap spark discharges driven by HV pulses with sub-ns rise time

Double-propagation mode in short-gap spark discharges driven by HV pulses with sub-ns rise time

Numerical simulation of dynamics behavior of pre-ionized pulsed-DC helium plasma jets at atmospheric pressure

Contact Info

Product

Resources

About