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Characterization of GAN/ALN on SI Using Conventional RF Magnetron Sputtering 传统射频磁控溅射在SI上表征GAN/ALN
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717939
A. S. Bakri, N. Nafarizal, R. Ali, M. Ahmad, M. Z. Sahdan, A. Bakar, N. A. Raship, A. Aldalbahi
{"title":"Characterization of GAN/ALN on SI Using Conventional RF Magnetron Sputtering","authors":"A. S. Bakri, N. Nafarizal, R. Ali, M. Ahmad, M. Z. Sahdan, A. Bakar, N. A. Raship, A. Aldalbahi","doi":"10.1109/ICOPS37625.2020.9717939","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717939","url":null,"abstract":"Gallium nitride is a III-nitride material that commonly used in light emitting diode (LED) and power electronic devices. Gallium nitride has direct energy bandgap and excellent thermal stability. The growth of GaN are commercially available using metal organic chemical vapour deposition (MOCVD), hydride vapour phase epitaxy (HVPE) and molecular beam epitaxy (MBE). Recently, the growth of GaN using magnetron sputtering have attracted increasing attention due to low temperature deposition, low cost and the capability of magnetron sputtering produce good crystal quality of GaN. Growth of GaN directly on silicon wafer will lead to the presence of defects. Thus, the AlN layer uses as a nucleation layer before the growth of GaN.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128531663","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
From Terahertz Spectroscopy to Novel Devices 从太赫兹光谱学到新型器件
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717877
M. Johnston
{"title":"From Terahertz Spectroscopy to Novel Devices","authors":"M. Johnston","doi":"10.1109/ICOPS37625.2020.9717877","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717877","url":null,"abstract":"Realising the potential of new materials in electronic devices requires a good understanding of their electrical properties. However, characterizing such materials can be challenging, particularly if the technology for making electrical contacts to them is yet to be developed. This is where non-contact probes of electrical conductivity come to the fore. In particular time-resolved terahertz photoconductivity spectroscopy (TRTPS) is an excellent free-space probe of the electronic properties of semiconductors that also allows charge-carrier dynamics to be followed with sub-picosecond time resolution.1 Thus, not only can the key figures-of-merit of a material be determined, but also parameters of charge formation and recombination.2","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128167815","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
PFL Output Switch Options for Gamble III PFL输出开关选项赌博III
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717639
R. Allen, P. Adamson, R. Cairns, D. Hinshelwood, J. Neri, J. Schumer, B. Weber
{"title":"PFL Output Switch Options for Gamble III","authors":"R. Allen, P. Adamson, R. Cairns, D. Hinshelwood, J. Neri, J. Schumer, B. Weber","doi":"10.1109/ICOPS37625.2020.9717639","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717639","url":null,"abstract":"NRL is exploring options for the pulse-forming line (PFL) output switch on the Gamble III generator1, currently in design. The Gamble I and II series of generators were the first terawatt scale machines in the Western world to employ water for energy storage2 and although ubiquitous now, it was originally unclear whether this was a good idea, hence the name “Gamble”. Gamble III will continue with the use of water for the intermediate store (IS) capacitors and the pulse forming line (PFL) output. However, to increase reliability, we aim to improve both the IS (between IS and PFL) switch and PFL output switch. We have already decided to replace the self-breaking water IS switch of Gamble II with three laser triggered gas switches, similar to those used on the much newer Mercury3 generator at NRL. However, experiments are needed on Gamble II to determine whether the self-breaking oil switch4 used on Gamble II can be replaced with a combination of self-breaking water PFL switch and self-breaking water prepulse switch, in a similar way as is done in Mercury. This paper will detail the design of water PFL and prepulse switches and the results from testing this new hardware on Gamble II generator. These tests are done to better inform the design of these switches for Gamble III and, ultimately, the choice between water and oil for the PFL switch medium.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129309893","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
The Power Reduction of the Air-Breathing Hall-Effect Thruster 吸气式霍尔效应推进器的功率降低
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717959
Sungrae Kim, M. Keidar
{"title":"The Power Reduction of the Air-Breathing Hall-Effect Thruster","authors":"Sungrae Kim, M. Keidar","doi":"10.1109/ICOPS37625.2020.9717959","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717959","url":null,"abstract":"The Hall-effect thruster (HET), a kind of the electric propulsion system, is known as one of next generation propulsion system because of a lot of benefits. Furthermore, the air-breathing Hall-effect thruster (ABHET) has additional benefits in comparison to the HET. By using the ambient air as a propellant while the HET uses the noble gas as a propellant, it doesn't require a space to store a propellant, which results the decrease in its size. It may allow the spacecraft to bring more payloads and to be able to be operated for longer time. Previously, the research1 on the ABHET has been performed, but the power was so high that the thruster can't bear with it. This is because the research was done with the consideration that all atoms are fully ionized, which resulted very high power. Thus, this research is done in order to look at the proper ionization rate for which the device can bear with. The power needs to be reduced to approximately 1kW or less. The operational altitude is from 90km to 100km, which is known as the LEO (Low Earth Orbit). The power needed is calculated by controlling the ionization rate. Also, the length of the channel is considered to control the power. Based on the results, the proper ionization rate and the proper length of the channel are presented and discussed.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127135263","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
Effect of Oxygen Plasma on Magnetoelectric Properties of NiFe2O4/PVDF Composites 氧等离子体对NiFe2O4/PVDF复合材料磁电性能的影响
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717484
A. Chaurasiya, R. Medwal, J. Vas, M. Mishra, Paul Lee Choon Keat, R. Rawat, P. Pal, Ashutosh Kumar Singh
{"title":"Effect of Oxygen Plasma on Magnetoelectric Properties of NiFe2O4/PVDF Composites","authors":"A. Chaurasiya, R. Medwal, J. Vas, M. Mishra, Paul Lee Choon Keat, R. Rawat, P. Pal, Ashutosh Kumar Singh","doi":"10.1109/ICOPS37625.2020.9717484","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717484","url":null,"abstract":"Flexible multiferroic composite with enhanced dielectric property is a potential candidate for future memory devices. Here, 0–3 type of artificial multiferroic was developed to enhance the dielectric property of the multiferroic composite. As the loading of the magnetic nanoparticles in the PVDF matrix increases from 10 wt% to 40 wt% the electroactive phase of the composite increases probed by dielectric measurement. The increase in the loading of magnetic nanoparticles inside the PVDF matrix from 10 to 40 wt% also control the dielectric losses of the samples. The vibrating sample magnetometer measurement was performed for the composite films with varying composition and found that the magnetic moment is increased linearly with the loading of magnetic nanoparticles. Our 0–3 type multiferroic composite device is nonvolatile in nature which can form the basis for future nonvolatile magnetic memory devices. To further improve the dielectric and magnetoelectric property of the multiferroic composite samples, different wt % of NiFe2O4 NPs was exposed by dense plasma focus device in the oxygen environment. After oxygen plasma exposure the electrical and magnetic properties measurement performed using I-V and magnetoelectric measurement setup respectively. The enhancement in the magnetoelectric properties has been observed after the plasma treatment. Thus, it suggests that plasma modification could be a promising approach to enhance the magnetoelectric coupling for future magnetoelectric devices.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127428615","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
Physics of Electron Emission from Two-Dimensional Nanomaterials 二维纳米材料的电子发射物理学
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717699
Y. Ang
{"title":"Physics of Electron Emission from Two-Dimensional Nanomaterials","authors":"Y. Ang","doi":"10.1109/ICOPS37625.2020.9717699","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717699","url":null,"abstract":"Nanomaterials with reduced dimensionality offers a new paradigm in the design of nanoscale vacuum devices1, 2. Because of the reduced dimensionality and the exotic energy band structure of two-dimensional (2D) materials, the physics of electron emission becomes drastically different compared to the conventional bulk materials. In this talk, we review the physics of electron emission from 2D nanomaterials. We show that, in the thermionic emission regime, the electron emission characteristics can be well-captured by a universal scaling laws broadly applicable to wide classes of 2D materials3. The modelling of electron field emission from 2D semimetals of various band topology will also be introduced. As electron emission is a critically important interfacial charge transport process in both solid/vacuum and solid/solid interfaces, the physics-based electron emission models4, 5 developed recently shall provide a theoretical foundation for both the fundamental study of surface physics, and the practical engineering of solid-state and vacuum electronic devices based on 2D materials and their heterostructures.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127259242","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
Dual Structured Terahertz Beam Generators Based on All-Dielectric Metasurfaces 基于全介电超表面的双结构太赫兹波束发生器
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717734
Chunyu Liu, Xi Feng, Mingrui Yuan, Huifang Zhang, Yanfeng Li, Jiaguang Han, Weili Zhang
{"title":"Dual Structured Terahertz Beam Generators Based on All-Dielectric Metasurfaces","authors":"Chunyu Liu, Xi Feng, Mingrui Yuan, Huifang Zhang, Yanfeng Li, Jiaguang Han, Weili Zhang","doi":"10.1109/ICOPS37625.2020.9717734","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717734","url":null,"abstract":"With properties of lower photon energy, higher imaging resolution compared with microwaves, and strong penetration into many dielectric materials, terahertz (THz) waves can find important applications in areas such as spectroscopy, imaging, communications, and non-destructive evaluation. Recently, structured beams with unique field distribution and non-diffractive transmission, particularly Bessel beams1, have been used in THz spectroscopy and imaging, enhancing the performances of THz technology and promoting new advances.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130048879","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
Unipic: A Conformal Particle-In-Cell Code for High Power Micrwowave and Pulse Discharge Unipic:高功率微波和脉冲放电的保形粒子单元码
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717437
Yongdong Li, Yue Wang, Chunliang Liu, Hongguang Wang, M. Jiang, Yonggui Zhai, Zehua Tang
{"title":"Unipic: A Conformal Particle-In-Cell Code for High Power Micrwowave and Pulse Discharge","authors":"Yongdong Li, Yue Wang, Chunliang Liu, Hongguang Wang, M. Jiang, Yonggui Zhai, Zehua Tang","doi":"10.1109/ICOPS37625.2020.9717437","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717437","url":null,"abstract":"UNIPIC is a particle-in-cell code for high power microwave device design and high voltage pulse discharge simulation[1]. It uses the explicit symplectic integrators[2] for Maxwell Equation, which can accurately solve the electromagnetic field value at the complex boundary, reduce the numerical dispersion error by more than two orders of magnitude, and greatly reduce the pseudo-Cherenkov radiation. Together with USC-FIT algorithm, the integrators could compute electromagnetic field conformally. UNIPIC uses the three-step Boris integrator[3] and cut-cell boundary processing algorithm to advance and emit charged particles conformally.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130072437","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: 1
Sub-THz Traveling Wave Tubes for Novel Wireless High Capacity Networks 新型无线大容量网络的亚太赫兹行波管
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717945
C. Paoloni, Rupa Basu, Jeevan M. Rao, R. Letizia
{"title":"Sub-THz Traveling Wave Tubes for Novel Wireless High Capacity Networks","authors":"C. Paoloni, Rupa Basu, Jeevan M. Rao, R. Letizia","doi":"10.1109/ICOPS37625.2020.9717945","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717945","url":null,"abstract":"The substantial increase of internet traffic forecasted in the near future, exceeds the capacity of the actual wireless networks at sub-6GHz and at low millimeter wave frequencies. The spectrum above 100 GHz has very wide frequency bands to provide multigigabit per second (Gb/s) data rate, not yet utilized for the high path loss and rain attenuation. The low output power from solid state amplifiers is not sufficient to ensure long range with high signal-to-noise ratio for supporting high data rate. This is even more critical in case of distribution in point to multipoint by a low gain antenna. New wireless links at D-band are development phase to offer tens of Gb/s data rate [1].","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129046786","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
Modeling Properties of the DBD in Ar-S2 Mixtures Using a 1D Fluid Model 用一维流体模型模拟Ar-S2混合物中DBD的特性
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717346
S. Avtaeva
{"title":"Modeling Properties of the DBD in Ar-S2 Mixtures Using a 1D Fluid Model","authors":"S. Avtaeva","doi":"10.1109/ICOPS37625.2020.9717346","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717346","url":null,"abstract":"Discharges in noble gas mixtures with sulfur vapor allow obtaining the radiation spectrum, caused by radiation of S2 dimers, being like solar [1], [2]. Dielectric barrier discharges (DBD) are widely used for formation of excimer molecules radiation in excimer lamps [3]. For study efficiency of S2 dimer radiation in DBDs a one-dimensional hydrodynamic model of a dielectric-barrier discharge (DBD) in Ar-S2 mixtures is developed, and the properties of the discharge are modeled. The discharge is excited in a 3-mm-long discharge gap between 2-mm-thick dielectric quartz layers covering metal electrodes. The DBD spatiotemporal characteristics at gas pressures of 300 Torr are modeled for the case in which a 20 kHz harmonic voltage with amplitude of 8 kV is applied to the electrodes. S2 content in Ar-S2 mixtures was varied in the range 0.1-1%.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130276758","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
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