Plasma Sources Science and Technology最新文献_第6页

Transient striations in an inductively coupled plasma during E-to-H transitions 电感耦合等离子体中从 E 到 H 转变过程中的瞬态条纹

Plasma Sources Science and Technology Pub Date : 2024-02-14 DOI: 10.1088/1361-6595/ad2951

Meng-Zhi Gu, Zhi-Cheng Lei, Xuan Zhang, Yi-kang Pu

引用次数: 0

Transient striations in an inductively coupled plasma during E-to-H transitions 电感耦合等离子体中从 E 到 H 转变过程中的瞬态条纹

Plasma Sources Science and Technology Pub Date : 2024-02-14 DOI: 10.1088/1361-6595/ad2951

Meng-Zhi Gu, Zhi-Cheng Lei, Xuan Zhang, Yi-kang Pu

引用次数: 0

Experimental and 2D fluid simulation of a streamer discharge in air over a water surface 水面上空气中流线型排放的实验和二维流体模拟

Plasma Sources Science and Technology Pub Date : 2024-02-12 DOI: 10.1088/1361-6595/ad286f

A. Herrmann, Joelle Margot, A. Hamdan

{"title":"Experimental and 2D fluid simulation of a streamer discharge in air over a water surface","authors":"A. Herrmann, Joelle Margot, A. Hamdan","doi":"10.1088/1361-6595/ad286f","DOIUrl":"https://doi.org/10.1088/1361-6595/ad286f","url":null,"abstract":"\u0000 The high reactivity and attractive properties of streamer discharges make them useful in many applications based on plasma-surface interactions. Therefore, understanding the mechanisms governing the propagation of a streamer discharge as well as its properties is an essential task. This paper presents the development and application of a 2D fluid model to the simulation of discharges triggered at the air-water interface by a pulsed nanosecond high voltage. Experimental characterization using 1-ns-time-resolved imaging reveals rapid transitions from a homogeneous disc to a ring and finally to dots during the discharge process. The simulation enables the determination of the spatio-temporal dynamics of the E-field and electron density, highlighting that the discharge reaches the liquid surface in less than 1 ns, triggering a radial surface discharge. As the discharge propagates along/over the water surface, a sheath forms behind its head. Furthermore, the simulation elucidates the transitions from disc to ring and from ring to dots. The former transition arises from the ionization front's propagation speed, where an initial disc-like feature changes to a ring due to the decreasing E-field strength. The ring-to-dots transition results from the destabilization caused by radial electron avalanches as the discharge head reaches a radius of ~1. 5 mm. The simulation is further utilized to estimate a charge number and a charge content in the discharge head. This work contributes to a better understanding of discharge propagation in air near a dielectric surface, with the agreement between simulation and experiment validating the model in its present version.","PeriodicalId":508056,"journal":{"name":"Plasma Sources Science and Technology","volume":"76 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139844077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental and 2D fluid simulation of a streamer discharge in air over a water surface 水面上空气中流线型排放的实验和二维流体模拟

Plasma Sources Science and Technology Pub Date : 2024-02-12 DOI: 10.1088/1361-6595/ad286f

A. Herrmann, Joelle Margot, A. Hamdan

{"title":"Experimental and 2D fluid simulation of a streamer discharge in air over a water surface","authors":"A. Herrmann, Joelle Margot, A. Hamdan","doi":"10.1088/1361-6595/ad286f","DOIUrl":"https://doi.org/10.1088/1361-6595/ad286f","url":null,"abstract":"\u0000 The high reactivity and attractive properties of streamer discharges make them useful in many applications based on plasma-surface interactions. Therefore, understanding the mechanisms governing the propagation of a streamer discharge as well as its properties is an essential task. This paper presents the development and application of a 2D fluid model to the simulation of discharges triggered at the air-water interface by a pulsed nanosecond high voltage. Experimental characterization using 1-ns-time-resolved imaging reveals rapid transitions from a homogeneous disc to a ring and finally to dots during the discharge process. The simulation enables the determination of the spatio-temporal dynamics of the E-field and electron density, highlighting that the discharge reaches the liquid surface in less than 1 ns, triggering a radial surface discharge. As the discharge propagates along/over the water surface, a sheath forms behind its head. Furthermore, the simulation elucidates the transitions from disc to ring and from ring to dots. The former transition arises from the ionization front's propagation speed, where an initial disc-like feature changes to a ring due to the decreasing E-field strength. The ring-to-dots transition results from the destabilization caused by radial electron avalanches as the discharge head reaches a radius of ~1. 5 mm. The simulation is further utilized to estimate a charge number and a charge content in the discharge head. This work contributes to a better understanding of discharge propagation in air near a dielectric surface, with the agreement between simulation and experiment validating the model in its present version.","PeriodicalId":508056,"journal":{"name":"Plasma Sources Science and Technology","volume":"49 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139783936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A harmonic method for measuring electron temperature and ion density using an asymmetric double probe 利用不对称双探针测量电子温度和离子密度的谐波法

Plasma Sources Science and Technology Pub Date : 2024-02-12 DOI: 10.1088/1361-6595/ad286d

Hyundong Eo, Sung Joon Park, Ju Ho Kim, Chin-Wook Chung

{"title":"A harmonic method for measuring electron temperature and ion density using an asymmetric double probe","authors":"Hyundong Eo, Sung Joon Park, Ju Ho Kim, Chin-Wook Chung","doi":"10.1088/1361-6595/ad286d","DOIUrl":"https://doi.org/10.1088/1361-6595/ad286d","url":null,"abstract":"\u0000 The harmonic method using a symmetric double probe was developed for measuring electron temperature and ion density (Meas. Sci. Technol. 23 085001). When an alternating voltage is applied to the symmetric double probe where the two areas of the collector for current collection are equal, the fundamental frequency current and third harmonic currents are generated. The electron temperature and ion density are obtained by measuring the fundamental frequency current and the third harmonic current. However, it is observed that the third harmonic current can rapidly decrease to the level of base noise when the ratio of the applied voltage to the electron temperature decreases. Therefore, it is necessary to increase the harmonic currents generated to improve measurement accuracy for electron temperature and ion density. In this paper, a harmonic method using an asymmetric double probe with different collection areas is proposed to measure electron temperature and ion density. By using the double probe with different collector area, the fundamental frequency current and the second harmonic current are generated. In the proposed method, the electron temperature and ion density are obtained by measuring the fundamental frequency current and the second harmonic current. It is found that the accuracy of the electron temperature can be improved by measuring the second harmonic rather than measuring the third harmonic current. For quantitative comparison, the electron temperature and ion density obtained by the proposed method were compared with the electron temperature and electron density obtained by the measurement electron energy probability function, which showed good agreement between them in argon plasma at various conditions. In addition, it was experimentally verified that the electron temperature can be accurately measured even when the chamber is electrically insulated, and a dielectric layer is deposited on the collectors of the double probe, such as in the plasma process.","PeriodicalId":508056,"journal":{"name":"Plasma Sources Science and Technology","volume":"68 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139844425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Diagnostics and characterization of a novel multi gas layer RF atmospheric pressure plasma jet for polymer processing 用于聚合物加工的新型多气层射频常压等离子射流的诊断和表征

Plasma Sources Science and Technology Pub Date : 2024-02-12 DOI: 10.1088/1361-6595/ad286e

Mehrnoush Narimisa, Yuliia Onyshchenko, Ivana Sremački, A. Nikiforov, R. Morent, N. De Geyter

{"title":"Diagnostics and characterization of a novel multi gas layer RF atmospheric pressure plasma jet for polymer processing","authors":"Mehrnoush Narimisa, Yuliia Onyshchenko, Ivana Sremački, A. Nikiforov, R. Morent, N. De Geyter","doi":"10.1088/1361-6595/ad286e","DOIUrl":"https://doi.org/10.1088/1361-6595/ad286e","url":null,"abstract":"\u0000 The quest to employ cold plasma sources at atmospheric pressure in polymer processing has emerged as a potent driving force behind their development. Atmospheric pressure operation of plasma jets provides potential cost reductions as well as easier handling and maintenance. In addition, their unique advantage of remote operation allows the substrate to be placed outside the source boundaries. This latter feature makes it easier to process complex three-dimensional objects and to integrate plasma jets into existing production lines. Although conventional atmospheric pressure plasma jet (APPJ) sources have undergone significant advancements in their design and construction, they have reached their technical and technological thresholds in several domains, thereby also impeding further enhancements in material processing applications. To cope with this issue, this work introduces a promising APPJ (named MPPJ3) working in a three co-axial gas layer geometry, incorporating the capability of aerosol and shield gas introduction leading to a configuration rich in reactive plasma species with controllable size and suitable temperature for polymer processing. A parametric study on the novel MPPJ3 device is carried out and plasma characteristics, such as reactive plasma species and temperatures, are determined by means of optical emission spectroscopy (OES), laser scattering, and infrared (IR) camera imaging whereas the fluid dynamics are analyzed using computational fluid dynamics (CFD) and Schlieren imaging. The obtained promising results clearly show the flexibility and adaptability of the MPPJ3 device for polymer processing applications.","PeriodicalId":508056,"journal":{"name":"Plasma Sources Science and Technology","volume":"329 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139842900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A harmonic method for measuring electron temperature and ion density using an asymmetric double probe 利用不对称双探针测量电子温度和离子密度的谐波法

Plasma Sources Science and Technology Pub Date : 2024-02-12 DOI: 10.1088/1361-6595/ad286d

Hyundong Eo, Sung Joon Park, Ju Ho Kim, Chin-Wook Chung

{"title":"A harmonic method for measuring electron temperature and ion density using an asymmetric double probe","authors":"Hyundong Eo, Sung Joon Park, Ju Ho Kim, Chin-Wook Chung","doi":"10.1088/1361-6595/ad286d","DOIUrl":"https://doi.org/10.1088/1361-6595/ad286d","url":null,"abstract":"\u0000 The harmonic method using a symmetric double probe was developed for measuring electron temperature and ion density (Meas. Sci. Technol. 23 085001). When an alternating voltage is applied to the symmetric double probe where the two areas of the collector for current collection are equal, the fundamental frequency current and third harmonic currents are generated. The electron temperature and ion density are obtained by measuring the fundamental frequency current and the third harmonic current. However, it is observed that the third harmonic current can rapidly decrease to the level of base noise when the ratio of the applied voltage to the electron temperature decreases. Therefore, it is necessary to increase the harmonic currents generated to improve measurement accuracy for electron temperature and ion density. In this paper, a harmonic method using an asymmetric double probe with different collection areas is proposed to measure electron temperature and ion density. By using the double probe with different collector area, the fundamental frequency current and the second harmonic current are generated. In the proposed method, the electron temperature and ion density are obtained by measuring the fundamental frequency current and the second harmonic current. It is found that the accuracy of the electron temperature can be improved by measuring the second harmonic rather than measuring the third harmonic current. For quantitative comparison, the electron temperature and ion density obtained by the proposed method were compared with the electron temperature and electron density obtained by the measurement electron energy probability function, which showed good agreement between them in argon plasma at various conditions. In addition, it was experimentally verified that the electron temperature can be accurately measured even when the chamber is electrically insulated, and a dielectric layer is deposited on the collectors of the double probe, such as in the plasma process.","PeriodicalId":508056,"journal":{"name":"Plasma Sources Science and Technology","volume":"07 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139784295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Diagnostics and characterization of a novel multi gas layer RF atmospheric pressure plasma jet for polymer processing 用于聚合物加工的新型多气层射频常压等离子射流的诊断和表征

Plasma Sources Science and Technology Pub Date : 2024-02-12 DOI: 10.1088/1361-6595/ad286e

Mehrnoush Narimisa, Yuliia Onyshchenko, Ivana Sremački, A. Nikiforov, R. Morent, N. De Geyter

{"title":"Diagnostics and characterization of a novel multi gas layer RF atmospheric pressure plasma jet for polymer processing","authors":"Mehrnoush Narimisa, Yuliia Onyshchenko, Ivana Sremački, A. Nikiforov, R. Morent, N. De Geyter","doi":"10.1088/1361-6595/ad286e","DOIUrl":"https://doi.org/10.1088/1361-6595/ad286e","url":null,"abstract":"\u0000 The quest to employ cold plasma sources at atmospheric pressure in polymer processing has emerged as a potent driving force behind their development. Atmospheric pressure operation of plasma jets provides potential cost reductions as well as easier handling and maintenance. In addition, their unique advantage of remote operation allows the substrate to be placed outside the source boundaries. This latter feature makes it easier to process complex three-dimensional objects and to integrate plasma jets into existing production lines. Although conventional atmospheric pressure plasma jet (APPJ) sources have undergone significant advancements in their design and construction, they have reached their technical and technological thresholds in several domains, thereby also impeding further enhancements in material processing applications. To cope with this issue, this work introduces a promising APPJ (named MPPJ3) working in a three co-axial gas layer geometry, incorporating the capability of aerosol and shield gas introduction leading to a configuration rich in reactive plasma species with controllable size and suitable temperature for polymer processing. A parametric study on the novel MPPJ3 device is carried out and plasma characteristics, such as reactive plasma species and temperatures, are determined by means of optical emission spectroscopy (OES), laser scattering, and infrared (IR) camera imaging whereas the fluid dynamics are analyzed using computational fluid dynamics (CFD) and Schlieren imaging. The obtained promising results clearly show the flexibility and adaptability of the MPPJ3 device for polymer processing applications.","PeriodicalId":508056,"journal":{"name":"Plasma Sources Science and Technology","volume":"6 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139783093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electrical characterization and imaging of discharge morphology in a small-scale packed bed dielectric barrier discharge 小规模填料床介质势垒放电中放电形态的电学表征和成像

Plasma Sources Science and Technology Pub Date : 2024-02-09 DOI: 10.1088/1361-6595/ad27ed

Rezvan Hosseini Rad, Volker Brüser, Ronny Brandenburg

{"title":"Electrical characterization and imaging of discharge morphology in a small-scale packed bed dielectric barrier discharge","authors":"Rezvan Hosseini Rad, Volker Brüser, Ronny Brandenburg","doi":"10.1088/1361-6595/ad27ed","DOIUrl":"https://doi.org/10.1088/1361-6595/ad27ed","url":null,"abstract":"\u0000 Packed bed dielectric barrier discharges exhibit an improved energy efficiency and selectivity in nonthermal plasma based gas conversion. They enable the direct interaction between plasma and catalyst. In this contribution a compact coaxial DBD reactor enabling the end-on imaging of the discharge with and without packed beds is constructed and studied. The discharge morphology is correlated with electrical measurements such as V-Q plots. The studies are performed for different packed bed materials, binary gas compositions of argon and carbon dioxide, voltage amplitudes, average powers, and pressures. The analysis points outs the role of parasitic capacitances and parasitic discharges as often overlooked aspects. The introduction of the packed bed material into the coaxial barrier discharge arrangement increases the total capacitance, but the barrier of the outer glass tube mostly determines the maximum effective dielectric capacitance. The choice of the packed bed material determines the voltage threshold and the average discharge power. The investigations leads to a revision of the equivalent circuit for packed bed barrier discharge reactors, which also accounts the properties of different filling materials.","PeriodicalId":508056,"journal":{"name":"Plasma Sources Science and Technology","volume":"308 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139848535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fine structure resolved excitation cross sections of singly ionized Ga for the modeling and diagnostics of Ga plasmas 用于镓等离子体建模和诊断的单电离镓的精细结构解析激发截面

Plasma Sources Science and Technology Pub Date : 2024-02-09 DOI: 10.1088/1361-6595/ad27ec

Indhu Suresh, Priti Priti, R. Srivastava, R. Gangwar

{"title":"Fine structure resolved excitation cross sections of singly ionized Ga for the modeling and diagnostics of Ga plasmas","authors":"Indhu Suresh, Priti Priti, R. Srivastava, R. Gangwar","doi":"10.1088/1361-6595/ad27ec","DOIUrl":"https://doi.org/10.1088/1361-6595/ad27ec","url":null,"abstract":"\u0000 Calculation of electron impact excitation cross sections for singly charged Ga ions plays a crucial role in plasma modeling, facilitating the comprehension of plasma behavior, characteristics, and dynamics in diverse domains, such as astrophysics, fusion research, the semiconductor industry, etc. In the available literature, there is a notable scarcity of, or even a complete absence of, these cross sections. Hence, in the present work, electron impact excitation cross sections are calculated for the transitions from the fine structure resolved energy levels of the configurations 4s2 and 4s4p to the fine structure resolved energy levels of the configurations 4s4p, 4s5s, 4p2 and 4s4d of the singly charged Ga ion (Ga+) using the relativistic distorted wave approximation theory with the target states represented by multi configurational Dirac Fock wavefunctions. The cross sections are calculated for projectile electron energy varying from threshold to 500 eV. Furthermore, the electron impact excitation rate coefficients for all the transitions under investigation are also calculated for electron temperatures ranging from 0.5 to 5 eV. In addition, analytic fitting of the rate coefficients is also performed, providing a practical resource for directly utilizing in plasma modeling applications.","PeriodicalId":508056,"journal":{"name":"Plasma Sources Science and Technology","volume":"19 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139850026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0