The dynamics of XeCl discharge contraction

Makarov, M.; Bychkov, Yuri

doi:10.1088/0022-3727/29/2/011

Cited by 27 publications

(42 citation statements)

References 23 publications

(48 reference statements)

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“…This is known to cause a reduction in the lamp efficiency [21]. The gas discharge contraction can be limited by the use of short duration current pulses followed by long pauses allowing plasma relaxation.…”

Section: ) Duration Of the Voltage Pulsesmentioning

confidence: 99%

Efficiency of an Exciplex DBD Lamp Excited Under Different Methods

Florez¹,

Schitz²,

Piquet³

et al. 2018

IEEE Trans. Plasma Sci.

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Abstract-Three different electrical generators have been designed and used to supply an exciplex dielectric barrier discharge lamp in order to elucidate the influence of each one of these supplying strategies over the system performance; the first method consists on supplying the lamp with short bipolar voltage pulses; the second and third methods are based on semiresonant converters were current pulses, of controlled duration and magnitude, are injected into the lamp. For each one of the generators, measurements of the lamp and supply efficiency, are performed and analyzed, at different levels of power (up to 130 W) and operating frequencies (60-90 kHz). From the experimental results, the pulsed voltage-mode approach has allowed obtaining the highest lamp efficiency (7%), yet the maximum supply efficiency is offered by the resonant mode supplies. On the basis of the lamp and the supply efficiencies, the whole system performance is analyzed.Index Terms-Dielectric-barrier discharge (DBD), exciplex lamp, pulsed voltage, resonant converter, ultraviolet.

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Section: ) Duration Of the Voltage Pulsesmentioning

confidence: 99%

Efficiency of an Exciplex DBD Lamp Excited Under Different Methods

Florez¹,

Schitz²,

Piquet³

et al. 2018

IEEE Trans. Plasma Sci.

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“…This result may not indicate that the reason of halogen donor depression leads to instability. Generally, the initiation of instability has been observed by Dreiskemper and Boetticher (1995), Makarov (1995) and Makarov and Bychkov (1996). The local strong emission of electrons from the cathode, through heating up the gas, may bring filamental instability with high probability.…”

Section: (3d) Discussion On Initiation Of a Micro-streamermentioning

confidence: 99%

“…Recently the dynamic behaviour of micro-discharges in XeCl excimer laser discharges has been observed optically by Makarov (1995), Makarov and Bychkov (1996) and Dreiskemper and Boetticher (1995). In their works the micro-discharges were shown to occur in the cathode fall region and develop in the direction of the anode.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of a Micro-streamer Initiation and Development of ArF Excimer Laser Discharges

Akashi¹,

Sakai²,

Tagashira³

1997

Aust. J. Phys.

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The dynamics of a constricted filamentary or ‘micro-streamer’ discharge in a discharge-excited ArF excimer laser has been examined using a two-dimensional fluid model. The entire process on a micro-streamer, from its initiation and development to extinction, is shown. In the present model, a micro-streamer is triggered at protrusions which always exist on cathode surfaces, and develops in the direction of the anode assisted by the high field induced by space charge. A rise in the gas temperature in the micro-streamer in the vicinity of a cathode is seen, and which is found to play an important role in its development. The effect of preionisation electron density ne0 on the streamer development is also examined, and the streamer is found to extend significantly when ne0 becomes low. The results are explained in connection with experimental observations.

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“…Furthermore, the switch inductance reduces the achievable pump power and in-creases the discharge current rise time. The latter is assumed to reduce the discharge stability [12].…”

Section: Introductionmentioning

confidence: 99%

Long-pulse KrCl laser with a high discharge quality

et al. 2007

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The discharge quality and optimum pump parameters of a long-pulse high-pressure gas discharge excited KrCl laser are investigated. A three-electrode prepulse-mainpulse excitation circuit is employed as pump source. The discharge volume contains a gas mixture of HCl/Kr/Ne operated at a total pressure of up to 5 bar. For a plane-plane resonator, the divergence of both output laser beams is measured. A low beam divergence of less than 1 mrad is measured as a result of the very high discharge homogeneity. A maximum laser pulse duration of 150 ns (FWHM) is achieved for a pump duration of 270 ns (FWHM) and a power density of 340 kW cm −3 . Pumping the discharge under optimum conditions employing a stable resonator results in a maximum specific energy of 0.45 J/l with a laser pulse duration of 117 ns and an efficiency of 0.63% based on the deposited energy. High-pressure gas-discharge pumped rare-gas halide excimer lasers are sources of very powerful ultraviolet (UV) radiation. The wavelength range covered and the high pulse energies have made excimer lasers an extensively used tool for applications in science, industry and also in medicine [1,2]. Gas discharge pumping opened the way to UV-lasers with pulse repetition rates up to several kHz with output powers up to the kW-level. However, excimer lasers pumped by a simple charge-transfer circuit [3,4] are restricted to low efficiencies and short pulse durations of only a few tens of nanoseconds. Voltage matching between the storage capacitance used to pump the laser and the discharge steady-state voltage is hardly achievable with such circuits. The discharge current tends to oscillate under these conditions. Discharge instabilities grow rapidly due to the voltage mismatching and the current oscillation. The beam quality of these lasers is poor, as the required time to build up a beam with a low divergence is longer than the stability time of the discharge.An important step to increase the efficiency and pulse duration of excimer lasers has been the development of u Fax: +31 53 4891102, E-mail: l.c.casper@tnw.utwente.nl the prepulse-mainpulse excitation technique [5,6]. The prepulse, a very fast rising high-voltage pulse, is applied to the discharge electrodes within a few nanoseconds after preionization to initiate the discharge homogeneously. A lowimpedance circuit generates the mainpulse in order to sustain the discharge and to pump the laser. The mainpulse voltage can be chosen independently from the prepulse voltage. Therefore, matching between the sustaining voltage and the steady-state voltage can be realized. As a result, this excitation technique leads to an optimization of the pump efficiency as the voltage matching is possible and current ringing can be avoided. The discharge stability improves considerably and leads to an extension of the laser pulse duration. In the case of XeCl lasers (308 nm), laser pulse durations of several hundreds of nanoseconds with efficiencies up to 5% have been realized [7,8] and raised strong interest in science and indu...

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The dynamics of XeCl discharge contraction

Cited by 27 publications

References 23 publications

Efficiency of an Exciplex DBD Lamp Excited Under Different Methods

Efficiency of an Exciplex DBD Lamp Excited Under Different Methods

Modeling of a Micro-streamer Initiation and Development of ArF Excimer Laser Discharges

Long-pulse KrCl laser with a high discharge quality

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