000002375 001__ 2375
000002375 005__ 20190326164007.0
000002375 022__ $$a1434-6079
000002375 0247_ $$2DOI$$a10.1140/epjd/e2017-70490-6
000002375 037__ $$aARTICLE
000002375 041__ $$aeng
000002375 245__ $$ban innovation for electrodeless high-pressure discharge lamps$$aOn the plasma confinement by acoustic resonance :
000002375 260__ $$c2017
000002375 269__ $$a2017-08
000002375 300__ $$a47 pages
000002375 506__ $$avisible
000002375 520__ $$9eng$$aIn an applied research project on the development of a pulsed microwave sulfur lamp prototype of 1 kW, we have discovered an amazing phenomenon in which the plasma forms a ball staying at the center of the bulb despite gravity, thus protecting the glass from melting. In this paper, it is shown that this results from an acoustic resonance in a spherical mode. Measurements of the plasma response to short pulses are presented showing beats at the spherical resonance. It is demonstrated that the beats could result from the simultaneous excitation of two normal modes with a frequency difference of approximately 1%. One of the two frequencies matches precisely the microwave pulses repetition, a little below 30 kHz. Thus this one is due to a forced oscillation, whereas the other one is due to a free oscillation. The phase velocity of sound was calculated as a function of temperature in order to find the series of temperatures at which a resonance would occur if the bulb were an isothermal solid sphere. The mean temperature inside the actual bulb was determined from the only doublet of this series, that has characteristic frequencies close enough to cause the observed beats. In addition, one of these two modes has a spherical symmetry that can explain the plasma ball formation. The obtained mean temperature is consistent with the direct measurements on the bulb surface as well as with the temperature in the core of a similar plasma found in the literature. We have also proposed a model of the resonance onset based on the acoustic dispersion and the sound amplification due to electromagnetic coupling.
000002375 540__ $$acorrect
000002375 546__ $$aEnglish
000002375 592__ $$aHEIG-VD
000002375 592__ $$bIESE - Institut d'Energie et Systèmes Electriques
000002375 592__ $$cIngénierie et Architecture
000002375 65017 $$aIngénierie
000002375 6531_ $$amolecular plasma – pulsed microwave plasma – plasma confinement$$9eng
000002375 6531_ $$aacoustic resonance$$9eng
000002375 6531_ $$aacoustic dispersion$$9eng
000002375 6531_ $$asound amplification due to electromagnetic coupling plasma of sulfur$$9eng
000002375 6531_ $$aelectrodeless$$9eng
000002375 6531_ $$alight bulb$$9eng
000002375 6531_ $$ahigh-pressure lamps$$9eng
000002375 6531_ $$alight sources$$9eng
000002375 655__ $$ascientifique
000002375 700__ $$uSchool of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland$$aCourret, Gilles
000002375 700__ $$uSchool of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland$$aNikkola, Petri
000002375 700__ $$uSchool of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland$$aWasterlain, Sébastien
000002375 700__ $$uSchool of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland$$aGudozhnik, Olexandr
000002375 700__ $$uSchool of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland$$aGirardin, Michel
000002375 700__ $$uSchool of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland$$aBraun, Jonathan
000002375 700__ $$uSchool of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland$$aGavin, Serge
000002375 700__ $$uSchool of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland$$aCroci, Mirko
000002375 700__ $$uSchool of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland$$aEgolf, Peter William
000002375 773__ $$g2017, 71, 214$$tThe European Physical Journal D
000002375 8564_ $$uhttps://hesso.tind.io/record/2375/files/Courret_2017_plasma_confinement_by_acoustic_resonance_Postprint.pdf$$s4520457
000002375 8564_ $$uhttps://hesso.tind.io/record/2375/files/Courret_2017_plasma_confinement_by_acoustic_resonance_Postprint.pdf?subformat=pdfa$$s3345143$$xpdfa
000002375 909CO $$pGLOBAL_SET$$ooai:hesso.tind.io:2375
000002375 906__ $$aGREEN
000002375 950__ $$aI2
000002375 980__ $$ascientifique