A.A. Howling
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A birdcage resonant antenna for helicon wave generation in TORPEX Open
A birdcage resonant helicon antenna is designed, mounted, and tested in the toroidal device TORPEX. The birdcage resonant antenna is an alternative to the usual Boswell or half-helical antenna designs commonly used for ∼10 cm diameter heli…
A birdcage resonant antenna for helicon wave generation in TORPEX Open
A birdcage resonant helicon antenna is designed, mounted and tested in the toroidal device TORPEX. The birdcage resonant antenna is an alternative to the usual Boswell or half-helical antenna designs commonly used for $\sim$ 10 cm diameter…
Resonant Network Antennas for Radio-Frequency Plasma Sources Open
Resonant antennas are increasingly employed by the plasma industry, and the theory has now developed alongside the technological applications to the extent that it is timely to document the progress in this field to aid antenna design for …
Surface DBD degradation in humid air, and a hybrid surface-volume DBD for robust plasma operation at high humidity Open
Surface dielectric barrier discharge performance deteriorates in humid air, with permanent and/or reversible degradation of its components. Plasma operation in a humid environment is unavoidable when humid air or water-containing materials…
Catabolism of Glucosinolates into Nitriles Revealed by RNA Sequencing of Arabidopsis thaliana Seedlings after Non-Thermal Plasma-Seed Treatment Open
Non-thermal plasma-seed treatments could be an environmentally friendly method to modulate plant properties. Since it remains unclear how plasmas affect seeds, RNA sequencing was used here to analyze gene transcription changes in 7-day-old…
RNA Sequencing of Arabidopsis thaliana Seedlings after Non-Thermal Plasma-Seed Treatment Reveals Upregulation in Plant Stress and Defense Pathways Open
Not all agricultural practices are sustainable; however, non-thermal plasma treatment of seeds may be an eco-friendly alternative to improve macroscopic plant growth parameters. Despite the numerous successful results of plasma-seed treatm…
View article: A 1.5D fluid—Monte Carlo model of a hydrogen helicon plasma
A 1.5D fluid—Monte Carlo model of a hydrogen helicon plasma Open
Helicon plasma sources operating with hydrogen or deuterium might be attractive for fusion applications due to their higher power efficiency compared to inductive radiofrequency plasma sources. In recent years, the resonant antenna ion dev…
Entering the plasma agriculture field: An attempt to standardize protocols for plasma treatment of seeds Open
Plasma treatments are currently being assessed as a seed processing technology for agricultural purposes. There is sufficient information as a proof‐of‐concept, but a lack of standardization in the methodology prevents a convincing evaluat…
An In Situ FTIR Study of DBD Plasma Parameters for Accelerated Germination of Arabidopsis thaliana Seeds Open
Current agricultural practices are not sustainable; however, the non-thermal plasma treatment of seeds may be an eco-friendly alternative to alter macroscopic plant growth parameters. Despite numerous successful results of plasma-seed trea…
View article: Latest experimental and theoretical advances in the production of negative ions in caesium-free plasmas
Latest experimental and theoretical advances in the production of negative ions in caesium-free plasmas Open
\n This topical review gathers the last updates concerning caesium-free negative ion sources presented during the $$63{\\mathrm {rd}}$$ Course of the International school of Quantum Electronics of the Ettore Majorana Foundation and Europea…
View article: Helicon wave plasma generated by a resonant birdcage antenna: magnetic field measurements and analysis in the RAID linear device
Helicon wave plasma generated by a resonant birdcage antenna: magnetic field measurements and analysis in the RAID linear device Open
This paper describes a helicon-wave-sustained plasma generated by a novel birdcage antenna with cosine azimuthal current distribution. The resonant birdcage source maintains a stable intense plasma column from low (300 W) to high (10 kW) s…
View article: Negative hydrogen ion dynamics inside the plasma volume of a linear device: Estimates from particle-in-cell calculations
Negative hydrogen ion dynamics inside the plasma volume of a linear device: Estimates from particle-in-cell calculations Open
Negative hydrogen or deuterium ions are the precursor particles used to generate a high power beam of neutrals in order to heat the tokamak plasma core of magnetic fusion devices, inject current, and to some extent control instabilities. I…
Advantages and Limitations of Surface Analysis Techniques on Plasma-Treated Arabidopsis thaliana Seeds Open
Surface characterization of plasma-treated seeds has made significant progress over the last decade. Most papers in the literature use scanning electron microscopy (SEM) and contact angle goniometry to investigate surface modifications. Ho…
Mechanisms of Plasma-Seed Treatments as a Potential Seed Processing Technology Open
Plasma treatments are currently being assessed as a seed processing technology for agricultural purposes where seeds are typically subjected to pre-sowing treatments to improve the likelihood of timely and uniform germination. The aim of t…
View article: Proton Bunch Self-Modulation in Plasma with Density Gradient
Proton Bunch Self-Modulation in Plasma with Density Gradient Open
We study experimentally the effect of linear plasma density gradients on the self-modulation of a 400 GeV proton bunch. Results show that a positive or negative gradient increases or decreases the number of microbunches and the relative ch…
View article: Physics of helicon waves and negative ions in the Resonant Antenna Ion Device (RAID)
Physics of helicon waves and negative ions in the Resonant Antenna Ion Device (RAID) Open
International audience
View article: Proton beam defocusing in AWAKE: comparison of simulations and measurements
Proton beam defocusing in AWAKE: comparison of simulations and measurements Open
In 2017, AWAKE demonstrated the seeded self-modulation (SSM) of a 400 GeV proton beam from the Super Proton Synchrotron at CERN. The angular distribution of the protons deflected due to SSM is a quantitative measure of the process, which a…
Multiple dehydrogenation reactions of negative ions in low pressure silane plasma chemistry Open
Micro-particle formation in low pressure silane (SiH 4 ) plasmas has been of technical interest and concern for at least 40 years. Negative ion plasma chemistry is a candidate for the initial nucleation, which has been extensively studied …
View article: Proton beam defocusing in AWAKE: comparison of simulations and measurements
Proton beam defocusing in AWAKE: comparison of simulations and measurements Open
In 2017, AWAKE demonstrated the seeded self-modulation (SSM) of a 400 GeV proton beam from the Super Proton Synchrotron (SPS) at CERN. The angular distribution of the protons deflected due to SSM is a quantitative measure of the process, w…
Development of a plasma electroacoustic actuator for active noise control applications Open
Conventional loudspeakers generate sound through the vibration of a diaphragm, attached to a rigid frame through elastic suspensions. Although such construction is satisfactory for sound diffusion in steady environments, it is likely to fa…
Slip Ring Test Assembly With Increased Breakdown Voltage Limit for High-Voltage Bus Satellites Open
In this article, a setup including a passive gas breakdown mitigation technique for satellite slip ring assemblies (SRAs) is introduced and tested. The setup features a central conducting ring, separated from two external conducting limiti…
View article: Application of Thomson scattering to helicon plasma sources
Application of Thomson scattering to helicon plasma sources Open
The possibility of performing electron density and temperature measurements in a high power helicon plasma is a crucial issue in the framework of the AWAKE (Advanced WAKefield Experiment) project, which demonstrates acceleration of particl…
Cold Atmospheric Plasma Inactivation of Microbial Spores Compared on Reference Surfaces and Powder Particles Open
Heat-resistant spores on a dry, heat- and water-sensitive food matrix are difficult to inactivate. Radioactive or X-ray exposure is allowed and accepted only for some selected commodities. Non-thermal atmospheric pressure plasma treatments…
Negative ion characterization in a helicon plasma source for fusion neutral beams by cavity ring-down spectroscopy and Langmuir probe laser photodetachment Open
Negative ions are characterized in the helicon plasma source resonant antenna ion device (RAID) at the Swiss plasma center by means of cavity ring-down spectroscopy (CRDS) and Langmuir probe (LP)-assisted laser photodetachment. A high dens…
Magnetic field configurational study on a helicon-based plasma source for future neutral beam systems Open
International audience