Role of long-lived species in pulsed hollow cathode discharges in N2

Choi, P.; Kaufman, Y.; Aliaga, R.

doi:10.1063/1.103659

Cited by 16 publications

(11 citation statements)

References 10 publications

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“…Pejovic et al systematically studied the memory effect in the late afterglow for inert and molecular gases [10], but most studies were performed in nitrogen [11,12]. Similar effects were observed in pulsed hollow cathode discharges [13] and spark gaps.…”

Section: Introductionmentioning

confidence: 88%

Memory effect in semiconductor gas discharge electronic devices

Sadiq¹,

Kurt²,

Salamov³

2008

J. Phys. D: Appl. Phys.

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The memory effect in the planar semiconductor gas discharge system at different pressures (15–760 Torr) and interelectrode distances (60–445 µm) was experimentally studied. The study was performed on the basis of current–voltage characteristic (CVC) measurements with a time lag of several hours of afterglow periods. The influence of the active space charge remaining from the previous discharge on the breakdown voltage (UB) has been analysed using the CVC method for different conductivities of semiconductor GaAs photocathode. CVC showed that even a measurement taken 96 h after the first breakdown was influenced by accumulated active particles deposited from the previous discharge. Such phenomena based on metastable atoms surviving from the previous discharge and recombined on the cathode to create initial electrons in the avalanche mechanism are shown to be fully consistent with CVC data for both pre-breakdown and post-breakdown regions. However, in the post-breakdown region pronounced negative differential conductivity was observed. Such nonlinear electrical property of GaAs is attributed to the existence of deep electronic defect called EL2 in the semiconductor cathode material. On the other hand, the CVC data for subsequent dates present a correlation of memory effect and hysteresis behaviour. The explanation for such a relation is based on the influence of long lived active charges on the electronic transport mechanism of semiconductor material.

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Section: Introductionmentioning

confidence: 88%

Memory effect in semiconductor gas discharge electronic devices

Sadiq¹,

Kurt²,

Salamov³

2008

J. Phys. D: Appl. Phys.

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“…The pressure range covered spans from 60-400 mTorr. The discharge was operated at a repetition rate of 1 second to partially reduce the randomness in ionization growth, through the additional 0093-3813/95$04.00 0 1995 IEEE effects of metastables [9]. The discharge apparatus uses a pulse charged plate capacitor to produce a high voltage step across the electrodes with a rise time of less than 50 ns, and a selfdecay time constant of over 1 second.…”

Section: Expepjmental Detailsmentioning

confidence: 99%

Breakdown formation in a transient hollow cathode discharge-a statistical study

Choi

Chuaqui

Favre

et al. 1995

IEEE Trans. Plasma Sci.

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Discharge formation at low pressure is found to be greatly influenced in the presence of a suitable hollow cathode region. The formation of a moving virtual anode which extends the anode potential to within the hollow cathode region is thought to be responsible for the enhanced ionization growth which subsequently leads to gas breakdown. In this paper, the spatial evolution of the local potential in the discharge region of a pulsed hollow cathode discharge has been measured in a range of pressures with two different cathode apertures. An extensive data set has been collected and analyzed using a statistical technique. From the characteristic of the statistical distribution of the data, unique features associated with the role of hollow cathode at the different stages of discharge formation have been identified. It was found that the influence of the hollow cathode region is strongest in the start of ionization growth and in the final change over to high current breakdown.

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“…Another important difference to consider between our experiments and atmospheric sprites is the following: whereas in sprites metastable species have a mean life of the order of millisecond [ Sentman et al ., ], in lab discharges it has been found that the N 2 (A 3 Σ u + ) metastable, for example, can last for up to 8 s in the afterglow of a discharge [ Choi et al ., ]. In superellastic collisions these metastables can transfer their energies to the electrons increasing in this way the high‐energy tail of the energy distribution function so that the electrons have enough energy to ionize the N 2 molecules.…”

Section: Discussionmentioning

confidence: 99%

Comparison between low‐pressure laboratory discharges and atmospheric sprites

2017

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The discharge of a charged dielectric in low‐pressure air has characteristics that resemble some of the features of mesospheric discharges. The dielectric discharges in steps when the pressure of the surrounding air is gradually reduced from nearly atmospheric to ~0.01 torr. The setup employed here decouples the discharge from the power supply, and, thanks to that, unique properties of the discharge manifest themselves. For example, in the pressure interval ~10–100 torr streamers are emitted from the surface of the dielectric but when the pressure decreases to 2–16 torr these are replaced by spherically symmetrical discharges that we call peonies. These have interesting properties, like (a) they do not produce electrical field, (b) they remain static, and (c) their size increases with decreasing pressure. The peonies are a type of discharge that has not been reported before. They resemble sprite beads and are assumed to consist of large avalanches that do not lead to the formation of a streamer. At further lower pressures, in the interval 0.01–0.1 torr, diffuse volume discharges were observed that have some morphological similarities with sprite halos and the top of columnar sprites. The spectrographic measurements carried out show that the discharges have bands from the first and second positive systems in N2 as well as lines of N2+. Quenching of the first negative system of N2 was observed at 3 torr. In this work it was also observed how a cosmic ray can go on to trigger a discharge inside the experimentation chamber.

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Role of long-lived species in pulsed hollow cathode discharges in N2

Cited by 16 publications

References 10 publications

Memory effect in semiconductor gas discharge electronic devices

Memory effect in semiconductor gas discharge electronic devices

Breakdown formation in a transient hollow cathode discharge-a statistical study

Comparison between low‐pressure laboratory discharges and atmospheric sprites

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