Pub Date : 2017-05-01DOI: 10.1109/PLASMA.2017.8496369
Zhitong Chen, Shiqiang Zhang, I. Levchenko, I. Beilis, M. Keidar
Self-organization is intrinsic to complex non-living systems; albeit not in such ubiquitous amount, it still plays important role in some physical systems [1]. In this work, we present a novel approach which demonstrates nontrivial cancer-inhibiting capabilities of spontaneous pattern-forming self-organization at the interface between atmospheric pressure glow discharge plasma and liquid media. A pronounced cancer depressing activity towards at least two kinds of human cancer cells, namely breast cancer MDAMB-231 and human glioblastoma U87 cancer lines, was demonstrated. After a short treatment at the thinly stratified selforganized plasma-liquid interface pattern, the cancer inhibiting media demonstrate well pronounced depression and apoptosis activities towards tumor cells, not achievable without interfacial stratification of plasma jet to thin (of several μm) current filaments, which therefore play a pivotal (yet still not completely clear) role in building up the cancer inhibition properties. Moreover, thinly stratified, self-organized interfacial discharge is capable to efficiently control the ROS and RNS concentrations in the cancerinhibiting media, and in particular, abnormal ROS/RNS ratios not achievable in discharges which do not form stratified thin-filament patterns could be obtained [2, 3]. These results were explained in terms of interaction of thin plasma filaments of the self-organized pattern with gas and liquid, where the unusual interaction conditions (i.e., high surface-to-volume ratios etc.) cause accumulation of ROS, RNS and other species in unusual ratios and concentrations, thus forming potentially efficient anti-cancer cocktail. Our funding could be extremely important for handling the cancer proliferation problem, and hence, it should be brought to light to attract due attention of the researchers and explore the possible potential of this approach in tackling the challenging problem of high cancer-induced mortality and rising morbidity trends.
{"title":"Cancer Inhibiting Properties From Self-Organized Plasma-Liquid Interface: In Vitro Demonstration","authors":"Zhitong Chen, Shiqiang Zhang, I. Levchenko, I. Beilis, M. Keidar","doi":"10.1109/PLASMA.2017.8496369","DOIUrl":"https://doi.org/10.1109/PLASMA.2017.8496369","url":null,"abstract":"Self-organization is intrinsic to complex non-living systems; albeit not in such ubiquitous amount, it still plays important role in some physical systems [1]. In this work, we present a novel approach which demonstrates nontrivial cancer-inhibiting capabilities of spontaneous pattern-forming self-organization at the interface between atmospheric pressure glow discharge plasma and liquid media. A pronounced cancer depressing activity towards at least two kinds of human cancer cells, namely breast cancer MDAMB-231 and human glioblastoma U87 cancer lines, was demonstrated. After a short treatment at the thinly stratified selforganized plasma-liquid interface pattern, the cancer inhibiting media demonstrate well pronounced depression and apoptosis activities towards tumor cells, not achievable without interfacial stratification of plasma jet to thin (of several μm) current filaments, which therefore play a pivotal (yet still not completely clear) role in building up the cancer inhibition properties. Moreover, thinly stratified, self-organized interfacial discharge is capable to efficiently control the ROS and RNS concentrations in the cancerinhibiting media, and in particular, abnormal ROS/RNS ratios not achievable in discharges which do not form stratified thin-filament patterns could be obtained [2, 3]. These results were explained in terms of interaction of thin plasma filaments of the self-organized pattern with gas and liquid, where the unusual interaction conditions (i.e., high surface-to-volume ratios etc.) cause accumulation of ROS, RNS and other species in unusual ratios and concentrations, thus forming potentially efficient anti-cancer cocktail. Our funding could be extremely important for handling the cancer proliferation problem, and hence, it should be brought to light to attract due attention of the researchers and explore the possible potential of this approach in tackling the challenging problem of high cancer-induced mortality and rising morbidity trends.","PeriodicalId":145705,"journal":{"name":"2017 IEEE International Conference on Plasma Science (ICOPS)","volume":"56 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114036973","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}
Pub Date : 2017-05-01DOI: 10.1109/PLASMA.2017.8496212
Hieu K. A. Nguyen, A. Chowdhury, J. Dickens, R. Joshi, A. Neuber
Breakdown of air at atmospheric pressure in response to AC fields in gaps larger than 1 cm was simulated. Most previous literature concerning breakdown in this regime has focused on much smaller gaps1
{"title":"Electric Field Breakdown Versus Frequency Simulated Under Atmospheric Conditions For Large Gaps","authors":"Hieu K. A. Nguyen, A. Chowdhury, J. Dickens, R. Joshi, A. Neuber","doi":"10.1109/PLASMA.2017.8496212","DOIUrl":"https://doi.org/10.1109/PLASMA.2017.8496212","url":null,"abstract":"Breakdown of air at atmospheric pressure in response to AC fields in gaps larger than 1 cm was simulated. Most previous literature concerning breakdown in this regime has focused on much smaller gaps1","PeriodicalId":145705,"journal":{"name":"2017 IEEE International Conference on Plasma Science (ICOPS)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114588223","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}
Pub Date : 2017-05-01DOI: 10.1109/PLASMA.2017.8496335
A. Khrabrov, Liang Xu, I. Kaganovich, T. Sommerer
The left branch of the Paschen curve for helium gas is studied both experimentally and by means of particle-in-cell/Monte Carlo collisions (PIC/MCC) simulations. The physical model incorporates electron, ion, and fast atom species whose energy-dependent anisotropic scattering on background neutrals, as well as backscattering at the electrodes, is properly accounted for. For the range of breakdown voltage 15 kV ≤ Vbr ≤ 130 kV, a good agreement is observed between simulations and available experimental results for the discharge gap d = 1.4 cm. The PIC/MCC model is then used to estimate the Paschen curve at higher voltages up to 1 MV, based on the availability of input atomic data. We find that the pd similarity scaling does hold, and that above 300 kV the value of pd at breakdown begins to increase with increasing voltage.
{"title":"Paschen Curve for Helium in 100–1000 KV Range","authors":"A. Khrabrov, Liang Xu, I. Kaganovich, T. Sommerer","doi":"10.1109/PLASMA.2017.8496335","DOIUrl":"https://doi.org/10.1109/PLASMA.2017.8496335","url":null,"abstract":"The left branch of the Paschen curve for helium gas is studied both experimentally and by means of particle-in-cell/Monte Carlo collisions (PIC/MCC) simulations. The physical model incorporates electron, ion, and fast atom species whose energy-dependent anisotropic scattering on background neutrals, as well as backscattering at the electrodes, is properly accounted for. For the range of breakdown voltage 15 kV ≤ Vbr ≤ 130 kV, a good agreement is observed between simulations and available experimental results for the discharge gap d = 1.4 cm. The PIC/MCC model is then used to estimate the Paschen curve at higher voltages up to 1 MV, based on the availability of input atomic data. We find that the pd similarity scaling does hold, and that above 300 kV the value of pd at breakdown begins to increase with increasing voltage.","PeriodicalId":145705,"journal":{"name":"2017 IEEE International Conference on Plasma Science (ICOPS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129712629","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}
Pub Date : 2017-05-01DOI: 10.1109/PLASMA.2017.8496089
Yutaro Inuzuka, Takashi Yamato, Shinji Yamamoto, T. Iwao
Magnetic driven arc has been applied to DC breaker and fault current limiters. However, it has not been researched, especially stagnation and re-strike of the arc. In this paper, the process of arc moving affected by external magnetic field in magnetic driven arc is elucidated. Specifically, the behavior of magnetic driven arc with external magnetic field is measured by using the oscilloscope and HSVC (High Speed Video Camera). And an external magnetic field (1, 2, 3 mT) was applied by helmholtz coil. As a result, the arc mean moving speed increases with increasing the external magnetic field. The arc of re-strike time increases and stalemate time decreases with increasing the external magnetic field. Therefore, the anode spot moving speed increases 8 times because arc of re-strike occurs easily with the external magnetic field. Thus, the erosion of electrodes decreases and the arc moving becomes the smooth. However, the distance of re-strike decreases with increasing the external magnetic field because re-strike point is affected by cathode jet. The anode restrikes on the extension of the cathode jet. Therefore, the direction of cathode jet contributes to the process of arc moving.
{"title":"Process Of Arc Moving Affected By External Magnetic Field In Magnetic Driven Arc","authors":"Yutaro Inuzuka, Takashi Yamato, Shinji Yamamoto, T. Iwao","doi":"10.1109/PLASMA.2017.8496089","DOIUrl":"https://doi.org/10.1109/PLASMA.2017.8496089","url":null,"abstract":"Magnetic driven arc has been applied to DC breaker and fault current limiters. However, it has not been researched, especially stagnation and re-strike of the arc. In this paper, the process of arc moving affected by external magnetic field in magnetic driven arc is elucidated. Specifically, the behavior of magnetic driven arc with external magnetic field is measured by using the oscilloscope and HSVC (High Speed Video Camera). And an external magnetic field (1, 2, 3 mT) was applied by helmholtz coil. As a result, the arc mean moving speed increases with increasing the external magnetic field. The arc of re-strike time increases and stalemate time decreases with increasing the external magnetic field. Therefore, the anode spot moving speed increases 8 times because arc of re-strike occurs easily with the external magnetic field. Thus, the erosion of electrodes decreases and the arc moving becomes the smooth. However, the distance of re-strike decreases with increasing the external magnetic field because re-strike point is affected by cathode jet. The anode restrikes on the extension of the cathode jet. Therefore, the direction of cathode jet contributes to the process of arc moving.","PeriodicalId":145705,"journal":{"name":"2017 IEEE International Conference on Plasma Science (ICOPS)","volume":"26 10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126905573","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}
Pub Date : 2017-05-01DOI: 10.1109/PLASMA.2017.8495986
Soshi Iwata, Shinji Yamamoto, T. Iwao
Establishment of surface treatment technology using vacuum arc is expected in order to form a recycling-oriented society. Thus, it is required for elucidation of the quantity of vapor exerted by the area of vacuum arc cathode spot. However, it is difficult to elucidate this phenomenon with the experiment because the vacuum arc cathode spot is high temperature and high speed. Therefore, it is expected to elucidate this phenomenon with simulation. In this paper, the distribution of vapor density affected by the area of vacuum arc cathode spot is elucidated with 3D electromagnetic thermal fluid simulation. As a result, the quantity of metal vapor decreases with increasing the area of cathode spot. Because the current density decreases with increasing the area of cathode spot. Thus, Joule heat generation in the space decreases, and heat input to the cathode decreases. Therefore, the quantity of metal vapor decreases with increasing the area of cathode spot. In the future, the asymmetric distribution of vapor density is analyzed in order to control the cathode spot with the transverse magnetic field.
{"title":"Distribution Of Vapor Density Affected By Cathode Spot Area Of Vacuum Arc","authors":"Soshi Iwata, Shinji Yamamoto, T. Iwao","doi":"10.1109/PLASMA.2017.8495986","DOIUrl":"https://doi.org/10.1109/PLASMA.2017.8495986","url":null,"abstract":"Establishment of surface treatment technology using vacuum arc is expected in order to form a recycling-oriented society. Thus, it is required for elucidation of the quantity of vapor exerted by the area of vacuum arc cathode spot. However, it is difficult to elucidate this phenomenon with the experiment because the vacuum arc cathode spot is high temperature and high speed. Therefore, it is expected to elucidate this phenomenon with simulation. In this paper, the distribution of vapor density affected by the area of vacuum arc cathode spot is elucidated with 3D electromagnetic thermal fluid simulation. As a result, the quantity of metal vapor decreases with increasing the area of cathode spot. Because the current density decreases with increasing the area of cathode spot. Thus, Joule heat generation in the space decreases, and heat input to the cathode decreases. Therefore, the quantity of metal vapor decreases with increasing the area of cathode spot. In the future, the asymmetric distribution of vapor density is analyzed in order to control the cathode spot with the transverse magnetic field.","PeriodicalId":145705,"journal":{"name":"2017 IEEE International Conference on Plasma Science (ICOPS)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124029447","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}
Pub Date : 2017-05-01DOI: 10.1109/PLASMA.2017.8496306
Magesh T. Rajan, Krishna Patel, Sreeja Vemulapalli, Nandini Pokala
Non-thermal atmospheric plasma is an ambient temperature ionized gas acquiring significant attention as a favorable addition to anti-tumor treatment mainly due to the capability to produce and regulate delivery of ions, excited molecules, UV photons, and reactive species such as reactive oxygen species (ROS) and reactive nitrogen species (RNS) to a targeted site. The heterogeneous composition of non-thermal atmospheric plasma offers the opportunity to intervene numerous signaling pathways that control tumor cells. Subsequently, the array of non-thermal atmospheric plasma generated products has limited the identification of the mechanisms of action on tumor cells. In this work, we will present the results of non-thermal plasma jet treated on neuroblastoma cells using a murine neuroblastoma line derived from AJ mice and cultured in D10 media. The goal of this work is to determine the cell death response of neuroblastoma cells by using a non-thermal plasma jet. The effect of variable treatment dosage levels of non-thermal plasma was tested in neuroblastoma cells. The number of viable cells was evaluated, while apoptosis and necrosis was assessed. Our observations indicate that increased treatment dosage levels of non-thermal plasma jet caused varied results from no significant changes to apoptotic characteristics to induction of necrosis at extended dosages. Overall the results suggest that non-thermal plasma jet can be of significant application to the treatment of neuroblastoma cancer cells.
{"title":"Treatment on Neuroblastoma Cancer Cells Using Atmospheric Cold Plasma","authors":"Magesh T. Rajan, Krishna Patel, Sreeja Vemulapalli, Nandini Pokala","doi":"10.1109/PLASMA.2017.8496306","DOIUrl":"https://doi.org/10.1109/PLASMA.2017.8496306","url":null,"abstract":"Non-thermal atmospheric plasma is an ambient temperature ionized gas acquiring significant attention as a favorable addition to anti-tumor treatment mainly due to the capability to produce and regulate delivery of ions, excited molecules, UV photons, and reactive species such as reactive oxygen species (ROS) and reactive nitrogen species (RNS) to a targeted site. The heterogeneous composition of non-thermal atmospheric plasma offers the opportunity to intervene numerous signaling pathways that control tumor cells. Subsequently, the array of non-thermal atmospheric plasma generated products has limited the identification of the mechanisms of action on tumor cells. In this work, we will present the results of non-thermal plasma jet treated on neuroblastoma cells using a murine neuroblastoma line derived from AJ mice and cultured in D10 media. The goal of this work is to determine the cell death response of neuroblastoma cells by using a non-thermal plasma jet. The effect of variable treatment dosage levels of non-thermal plasma was tested in neuroblastoma cells. The number of viable cells was evaluated, while apoptosis and necrosis was assessed. Our observations indicate that increased treatment dosage levels of non-thermal plasma jet caused varied results from no significant changes to apoptotic characteristics to induction of necrosis at extended dosages. Overall the results suggest that non-thermal plasma jet can be of significant application to the treatment of neuroblastoma cancer cells.","PeriodicalId":145705,"journal":{"name":"2017 IEEE International Conference on Plasma Science (ICOPS)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123356712","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}
Pub Date : 2017-05-01DOI: 10.1109/PLASMA.2017.8496114
Neil A. Mehta, D. Levin
Emission characteristics of a colloid thruster or electrospray depends strongly on the electrochemical property of the ionic liquid as well as its response to the external electric field. Using molecular dynamics, the evolution of the Taylor cone formation for an electrospray device can be analyzed at an atomic level. From our previous work1, it was observed that the electric field strengths required to create and sustain a stable Taylor cone are correlated to the internal nanostructure of the propellant ionic liquid. The location of the applied extraction potential with respect to the capillary produces differences in the strength and the shape of the resulting external electric fields. The varying electric fields are strongest at the mouth of the capillary and affect the emission rate, Taylor cone stability, as well as the internal nanostructure of the ionic liquid. In this work, we will study the effects of variable electric field shape and strength on the Taylor cone structure.
{"title":"Influence of External Electric Field Boundary Conditions on Electrospray Emissions","authors":"Neil A. Mehta, D. Levin","doi":"10.1109/PLASMA.2017.8496114","DOIUrl":"https://doi.org/10.1109/PLASMA.2017.8496114","url":null,"abstract":"Emission characteristics of a colloid thruster or electrospray depends strongly on the electrochemical property of the ionic liquid as well as its response to the external electric field. Using molecular dynamics, the evolution of the Taylor cone formation for an electrospray device can be analyzed at an atomic level. From our previous work1, it was observed that the electric field strengths required to create and sustain a stable Taylor cone are correlated to the internal nanostructure of the propellant ionic liquid. The location of the applied extraction potential with respect to the capillary produces differences in the strength and the shape of the resulting external electric fields. The varying electric fields are strongest at the mouth of the capillary and affect the emission rate, Taylor cone stability, as well as the internal nanostructure of the ionic liquid. In this work, we will study the effects of variable electric field shape and strength on the Taylor cone structure.","PeriodicalId":145705,"journal":{"name":"2017 IEEE International Conference on Plasma Science (ICOPS)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114352421","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}
Pub Date : 2017-05-01DOI: 10.1109/PLASMA.2017.8496382
V. Messerle, A. Mosse, G. Paskalov, A. Ustimenko
An acute problem is the disposal of Biomedical Wastes (BMW) containing toxic substances. Plasma gasification is a promising technology for BMW disposal. In contrast to the traditional fire method of BMW processing plasma gasification of BMW provides reliable destruction of highly toxic dioxins, benzo(a)pyrene and furans. This report presents the results of thermodynamic analysis and experiments on plasma gasification of BMW.
{"title":"Plasma Gasification Of Biomedical Waste","authors":"V. Messerle, A. Mosse, G. Paskalov, A. Ustimenko","doi":"10.1109/PLASMA.2017.8496382","DOIUrl":"https://doi.org/10.1109/PLASMA.2017.8496382","url":null,"abstract":"An acute problem is the disposal of Biomedical Wastes (BMW) containing toxic substances. Plasma gasification is a promising technology for BMW disposal. In contrast to the traditional fire method of BMW processing plasma gasification of BMW provides reliable destruction of highly toxic dioxins, benzo(a)pyrene and furans. This report presents the results of thermodynamic analysis and experiments on plasma gasification of BMW.","PeriodicalId":145705,"journal":{"name":"2017 IEEE International Conference on Plasma Science (ICOPS)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121550521","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}
Pub Date : 2017-05-01DOI: 10.1109/PLASMA.2017.8496356
L. Barillas, J. M. Cubero-Sesin, V. Vargas, H. Testrich, Maik Froehlich, K. Weltmann, M. Polák
Nowadays, the use of polymers in modern orthopedics has become more common, not only because they can play an important role due to their weight, cost and performance; but also thanks to new manufacturing and processing technologies –mainly additive manufacturing or 3D printing–. Their application to polymers has allowed a wide range of medical devices to change from expensive and generic devices (“one size fits all”), to customized and more affordable options, being orthopedic implants one of the best examples of this revolution.
{"title":"Bioactive and Antibacterial Plasma Sprayed Coatings on Polymer Substrates Suitable for Orthopedic and Tissue Engineering Applications","authors":"L. Barillas, J. M. Cubero-Sesin, V. Vargas, H. Testrich, Maik Froehlich, K. Weltmann, M. Polák","doi":"10.1109/PLASMA.2017.8496356","DOIUrl":"https://doi.org/10.1109/PLASMA.2017.8496356","url":null,"abstract":"Nowadays, the use of polymers in modern orthopedics has become more common, not only because they can play an important role due to their weight, cost and performance; but also thanks to new manufacturing and processing technologies –mainly additive manufacturing or 3D printing–. Their application to polymers has allowed a wide range of medical devices to change from expensive and generic devices (“one size fits all”), to customized and more affordable options, being orthopedic implants one of the best examples of this revolution.","PeriodicalId":145705,"journal":{"name":"2017 IEEE International Conference on Plasma Science (ICOPS)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126352569","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}
Pub Date : 2017-05-01DOI: 10.1109/PLASMA.2017.8496205
B. Beaudoin, A. Ting, S. Gold, J. A. Karakkad, A. Narayan, G. Nusinovich, Charles Turner, T. Antonsen
A mobile heater for ionospheric modification studies will require a new megawatt class RF source operating with an antenna array that is 1/20 the area of HAARP [1]. In order to deliver an effective power density comparable to that of HAARP, the total source power must be in the range of 16 MW, thus demanding highly efficient sources [2]. The source design we are currently pursuing utilizes a grid-less electron gun that uses a mod-anode to turn a thin annular beam on and off in class D operation. The beam is passed through a decelerating gap and its kinetic energy is extracted using a tunable resonant circuit that presents a constant impedance over the frequency range of 3–10 MHz, such that the beam is almost decelerated at all frequencies.
{"title":"Experimental Measurements of Power Extraction Circuits For Mobile Ionospheric Heating*","authors":"B. Beaudoin, A. Ting, S. Gold, J. A. Karakkad, A. Narayan, G. Nusinovich, Charles Turner, T. Antonsen","doi":"10.1109/PLASMA.2017.8496205","DOIUrl":"https://doi.org/10.1109/PLASMA.2017.8496205","url":null,"abstract":"A mobile heater for ionospheric modification studies will require a new megawatt class RF source operating with an antenna array that is 1/20 the area of HAARP [1]. In order to deliver an effective power density comparable to that of HAARP, the total source power must be in the range of 16 MW, thus demanding highly efficient sources [2]. The source design we are currently pursuing utilizes a grid-less electron gun that uses a mod-anode to turn a thin annular beam on and off in class D operation. The beam is passed through a decelerating gap and its kinetic energy is extracted using a tunable resonant circuit that presents a constant impedance over the frequency range of 3–10 MHz, such that the beam is almost decelerated at all frequencies.","PeriodicalId":145705,"journal":{"name":"2017 IEEE International Conference on Plasma Science (ICOPS)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128045284","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}
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