Electron cyclotron resonance breakdown studies in a linear plasma system

Yadav, Vipin K.; Sathyanarayana, K.; Bora, D.

doi:10.1007/s12043-008-0064-6

Cited by 6 publications

(5 citation statements)

References 18 publications

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“…This result is in good agreement with a simple model derived from the volumetric rate of ionizing collisions in section 3.3. Similar dependence has been observed in microwave heated plasmas at higher pressures [25]. Our results extend the validity of this model into the very low pressure regime.…”

Section: Discussionsupporting

confidence: 89%

Plasma breakdown diagnostics with the biased disc of electron cyclotron resonance ion source

Tarvainen

Ropponen

Toivanen

et al. 2009

Plasma Sources Sci. Technol.

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The electron cyclotron resonance ion sources at the JYFL (University of Jyväskylä, Department of Physics) accelerator laboratory have been operated in pulsed mode to study the time-resolved current signal from the biased discs of the ion sources. The purpose of the experiments is to gain an understanding of the ion source parameters affecting the time required for the transition from neutral gas to plasma. It was observed that the plasma breakdown time depends strongly on the neutral gas density, gas species and density of seed electrons. In particular, it was observed that a low power microwave signal at secondary frequency makes the breakdown time virtually independent of the neutral gas density. The results can be utilized for operation of ECR ion sources in the so-called preglow mode. A simple qualitative model, which is in good agreement with the experiments, has been developed to interpret the results.

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Section: Discussionsupporting

confidence: 89%

Plasma breakdown diagnostics with the biased disc of electron cyclotron resonance ion source

Tarvainen

Ropponen

Toivanen

et al. 2009

Plasma Sources Sci. Technol.

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“…It turns out that λ e is almost 10 times larger in helium gas than in argon gas and that f e -which also stands for ionization frequency-is 10 times larger in argon than in helium (Yadav et al, 2008). These two reasons explain why energetic electrons can trigger primary avalanches of electrons (i.e., ionizing events) that are more numerous and operating over shorter distances in argon than in helium, hence promoting a filamentary behavior of cold plasma.…”

Section: The Carrier Gas Nature Influenced the Filamentary/homogeneou...mentioning

confidence: 99%

“…It turns out that 𝜆 𝑒 is almost 10 times larger in helium gas than in argon gas and that 𝑓 𝑒 -which also stands for ionization frequency -is 10 times larger in argon than in helium (Yadav et al, 2008). These two reasons explain why energetic electrons can trigger primary avalanches of electrons (i.e.…”

Section: Iii13 the Carrier Gas Nature Influenced The Filamentary/ Hom...mentioning

confidence: 99%

Cyto- and bio-compatibility assessment of plasma-treated polyvinylidene fluoride scaffolds for cardiac tissue engineering

Κιτσαρά

Revet

Vartanian-Grimaldi

et al. 2022

Front. Bioeng. Biotechnol.

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As part of applications dealing with cardiovascular tissue engineering, drop-cast polyvinylidene fluoride (PVDF) scaffolds have been treated by cold plasma to enhance their adherence to cardiac cells. The scaffolds were treated in a dielectric barrier device where cold plasma was generated in a gaseous environment combining a carrier gas (helium or argon) with/without a reactive gas (molecular nitrogen). We show that an Ar-N2 plasma treatment of 10 min results in significant hydrophilization of the scaffolds, with contact angles as low as 52.4° instead of 132.2° for native PVDF scaffolds. Correlation between optical emission spectroscopy and X-ray photoelectron spectroscopy shows that OH radicals from the plasma phase can functionalize the surface scaffolds, resulting in improved wettability. For all plasma-treated PVDF scaffolds, the adhesion and maturation of primary cardiomyocytes is increased, showing a well-organized sarcomeric structure (α-actinin immunostaining). The efficacy of plasma treatment was also supported by real-time PCR analysis to demonstrate an increased expression of the genes related to adhesion and cardiomyocyte function. Finally, the biocompatibility of the PVDF scaffolds was studied in a cardiac environment, after implantation of acellular scaffolds on the surface of the heart of healthy mice. Seven and 28 days after implantation, no exuberant fibrosis and no multinucleated giant cells were visible in the grafted area, hence demonstrating the absence of foreign body reaction and the biocompatibility of these scaffolds.

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“…When the microwave power is applied to the plasma chamber in presence of a magnetic field, the gas ionization and plasma formation processes take place [17]. Once the plasma is formed, impedance matching between the plasma impedance (load impedance) and the microwave generator impedance (source impedance) is necessary for maximum power transfer [18,19].…”

Section: Pulsed Beam Extraction From Cw Plasmamentioning

confidence: 99%

Experimental study of pulsed ion beam generated by different pulsing topology in 2.45 GHz ECR proton source

et al. 2021

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Electron cyclotron resonance breakdown studies in a linear plasma system

Cited by 6 publications

References 18 publications

Plasma breakdown diagnostics with the biased disc of electron cyclotron resonance ion source

Plasma breakdown diagnostics with the biased disc of electron cyclotron resonance ion source

Cyto- and bio-compatibility assessment of plasma-treated polyvinylidene fluoride scaffolds for cardiac tissue engineering

Experimental study of pulsed ion beam generated by different pulsing topology in 2.45 GHz ECR proton source

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