Radiation Efficiency of AC-excited Micro Hollow Cathode Discharges

Biborosch, L.; Petzenhauser, I.; Popescu, Ştefan; Luca, D.; Frank, K.

doi:10.1063/1.2168854

Cited by 2 publications

(3 citation statements)

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“…The voltage is constant and is around 200 V while the current increases from 1 to 3 mA. Different groups have found the same result in different gases [6,12,33,43]. This region corresponds to a normal glow discharge [42], where the plasma expands outside the hole towards the cathode backside.…”

Section: The Current-voltage Characteristicsmentioning

confidence: 77%

“…At relatively high averaged current (4 mA), Schoenbach et al reported some streamer-like current peaks with a maximum current peak as high as 300 mA and a time duration as short as few tens of nanoseconds [12]. On the other hand, at low average current (<1 mA), only few works were focused on the self-pulsed regime for which different explanations have been proposed [43][44][45]. Biborosch and coworkers [43] showed that the peak currents were in phase with the maximum expansion of the cathode glow and they supposed that the oscillations were due to the existence of a microplasma eigen frequency and so tried to achieve a resonant transfer of energy to the plasma by applying a ac voltage (40-140 kHz) instead of a dc plasma.…”

Section: Introductionmentioning

confidence: 99%

“…Biborosch and coworkers [43] showed that the peak currents were in phase with the maximum expansion of the cathode glow and they supposed that the oscillations were due to the existence of a microplasma eigen frequency and so tried to achieve a resonant transfer of energy to the plasma by applying a ac voltage (40-140 kHz) instead of a dc plasma. This proved to be unsuccessful [44]. Hsu and Graves [45] assumed that the self-pulsing is due to an instability resulting from the interaction between a negative differential resistance (NDR) of the MHCD current-voltage characteristic and the load line of the external circuit.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the self-pulsing operating mode of a microdischarge

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The self-pulsing regime of a microhollow cathode discharge in argon is reported. The plasma is generated inside the hole drilled in an anode-dielectric-cathode device. The hole dimension ranges from 200 to 400 µm and the gas pressure ranges from 40 to 200 Torr. It is shown by optical spectroscopy and fast CCD imaging that the current pulse is related to a fast expansion of the plasma outside the microhole on the cathode backside. The pulse current duration ranges from 0.4 to 2 µs depending on the gas pressure. The self-pulsing regime occurs at medium current range (0.1-1 mA). At lower current the discharge is steady and the plasma is confined inside the hole (abnormal regime); at higher current, the plasma is steady and the plasma expands outside the hole on the cathode backside. The self-pulsing frequency is a linear function of the averaged discharge current and decreases with the device capacitance. The dependence of the self-pulsing characteristics (frequency, light emission, power deposition, etc) on the gas pressure follows a Paschen-like law; this is interpreted in considering that the fast expansion of the plasma outside the hole is similar to a gas breakdown. A simple electrical model, using a bistable voltage-controlled variable resistor to simulate the evolution of the plasma impedance, provides qualitative results in good agreement with the experiments.

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