2020 IEEE International Conference on Plasma Science (ICOPS)最新文献_第10页

Low-Frequency Terahertz Quantum Cascade Laser Based On Intra-Cavity Nonlinear Mixing 基于腔内非线性混频的低频太赫兹量子级联激光器

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717855

K. Fujita

{"title":"Low-Frequency Terahertz Quantum Cascade Laser Based On Intra-Cavity Nonlinear Mixing","authors":"K. Fujita","doi":"10.1109/ICOPS37625.2020.9717855","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717855","url":null,"abstract":"Terahertz quantum cascade laser sources based on intracavity difference frequency generation are currently the only electrically-pumped monolithic semiconductor light sources operating at room temperature in the 1–6 THz spectral range. These devices demonstrated drastic improvements in performance in the past several years. Recent efforts in the wavefunction engineering using an active region design based on a dual-upper-state concept led to a significant enhancement of the optical nonlinearity of the active region for efficient terahertz generation.1 Our terahertz quantum cascade laser sources packaged in butterfly modules exhibit the power of >0.3 mW, with octave spanning comb-like terahertz emission spectra. In this presentation, we discuss low frequency generation from terahertz quantum cascade laser sources based on intra-cavity nonlinear frequency mixing. In order to obtain higher nonlinear susceptibility in low frequency region, we design a long wavelength dual-upper-state active region in which transition dipole moments are increased.2 A fabricated device with distributed feedback grating demonstrates a THz peak output power of $40 mu mathrm{W}$ at room temperature, with multi-mode THz emission at a frequency of 1.4 THz. Besides, a device produces THz output power of $> 250 mu mathrm{W}$ at 110 K, which is higher output power, compared to low-frequency (1.2-1.6 THz) THz-QCLs at liquid helium temperature (10 K). Furthermore, we have recently expanded their operation frequency ranges to sub-THz. This is the lowest frequency (longest wavelength) electrically pumped monolithic semiconductor laser source.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"55 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":"131686744","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

Enhanced Convergence of a Cylindrical Shockwave 圆柱形冲击波的增强收敛

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717716

A. Rososhek, S. Efimov, A. Virozub, D. Maler, Y. Krasik

引用次数: 0

Study on the Dual RF Plasma Enhanced Pulsed Laser Deposition of Titanium Nitride Thin Film 双射频等离子体增强脉冲激光沉积氮化钛薄膜的研究

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717829

H. Bhuyan, M. Escalona, S. Ibacache, M. J. Retamal, J. Valenzuela, F. Veloso, M. Favre, E. Wyndham, P. Saikia, C. Borgohain

引用次数: 0

The Measurement of Permittivity Using TE01 Mode in a Cylindrical Waveguide Beyond 300GHz Frquency Band 超300GHz圆柱形波导中TE01模式的介电常数测量

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717774

Hong Eun Choi, E. Choi

{"title":"The Measurement of Permittivity Using TE01 Mode in a Cylindrical Waveguide Beyond 300GHz Frquency Band","authors":"Hong Eun Choi, E. Choi","doi":"10.1109/ICOPS37625.2020.9717774","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717774","url":null,"abstract":"As the use of Terahertz (THz) frequency band in various research area such as natural science, material science, and communications system increases, the material permittivity which is one of important properties of material in high-frequency region becomes essential. However, accurate complex permittivity measurement in the frequency band beyond 100GHz is very difficult, therefore, references of permittivity data of materials are still lacking.1 One of the measurement methods in low-frequency uses a fundamental TE10 mode in the rectangular waveguide. However, it cannot be used in high frequency region because the dimension of experimental setup becomes diminishing, therefore, the air gap effect which causes disruption of resonance peaks grows bigger. In comparison to the TE10 mode, the TE01 mode has proven to provide very accurate measurement due to its low fields at surface of waveguide.2 Furthermore, the measurement using the TE01. mode is also easier from sample size limitation. In this paper, we present the extended research on the permittivity measurement by using the TE01 mode in the frequency beyond 300GHz from our previous work in W-band. Detail study will be performed with various samples for demonstrating the reliability of the TE01. mode measurement in THz frequency region.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"167 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":"132066866","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 Atmospheric Pressure Air DBD Plasma on Physio-Chemical and Microbial Parameters of Groundwater and its Use in Agriculture 大气压空气DBD等离子体对地下水理化和微生物参数的影响及其在农业上的应用

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717467

R. P. Guragain, B. Pandey, D. Subedi

{"title":"Effect of Atmospheric Pressure Air DBD Plasma on Physio-Chemical and Microbial Parameters of Groundwater and its Use in Agriculture","authors":"R. P. Guragain, B. Pandey, D. Subedi","doi":"10.1109/ICOPS37625.2020.9717467","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717467","url":null,"abstract":"Cold atmospheric pressure plasma generated at atmospheric air produces high energetic electrons, ions, UV radiations, reactive oxygen, and nitrogen species (RONS) which has a wide range of applications in biomedicine, agriculture, textiles, water treatment, etc. Recently, many research has been carried out on ozonation through DBD plasma in water treatment. However, direct plasma treatment on water hasn't been extensively studied yet. In this study, the change in physical, chemical and biological parameters by the means of direct DBD plasma activation was examined. The significant reduction in the concentration of biological parameters such as total coliform and E. coli with increasing treatment time was found. Besides that, DBD plasma also lowered down the concentration of physical parameters such as pH, turbidity, total suspended solids, total dissolved solids, and increases electrical conductivity and dissolved oxygen. In addition, the significant drop in the concentration of chemical parameters such as chromium, manganese, sodium, phosphorus, and calcium was found along with the reduction in heavy metals concentration such as iron, cadmium, lead, and zinc. However, the concentration of nitrite, nitrate, and sulfur augmented gradually. Soaking seeds in plasma activated water (PAW) not only serves as an anti-bacterial but also enhanced the seed germination and plant growth. In case of radish, the action of PAW contributed to the early seed germination, improved content of photosynthetic pigments in the leaves, plants growth, insect control and soil remediation, which altogether contributed towards an increased food production as compared to normal water. The increase in the nitrate and nitrite ions in PAW could be the main reason for the increase in plant growth.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"3 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":"132137807","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

New Understanding of How Cold Atmospheric Plasma Treat Cancer 低温大气等离子体治疗癌症的新认识

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717828

M. Keidar, D. Yan, J. Sherman

引用次数: 0

Effects of Circuit Inductance on Electrical and Shock Wave Characteristics During Underwater Copper wire Explosion 电路电感对水下铜线爆炸电特性和冲击波特性的影响

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717579

Guofeng Yin, Yunfei Fan, H. Shi, Jian Wu, Xingwen Li, A. Qiu

{"title":"Effects of Circuit Inductance on Electrical and Shock Wave Characteristics During Underwater Copper wire Explosion","authors":"Guofeng Yin, Yunfei Fan, H. Shi, Jian Wu, Xingwen Li, A. Qiu","doi":"10.1109/ICOPS37625.2020.9717579","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717579","url":null,"abstract":"Circuit inductance is an important parameter at underwater electrical wire explosion (UEWE) which is closely related to the energy deposition rate to the load wire. In this work, the circuit inductance was varied within a wide range from 1.55 $Boxmathrm{H}$ to 93.2 $Boxmathrm{H}$ by inserting inductive coils to study its effects on electrical and shock wave (SW) characteristics. Experimental results showed that SW peak pressure several-emaway from the wire is not sensitive to the increase of circuit inductance when properly choosing the diameter of load wire: the SW peak pressure obtained with varied diameter (with constant energy storage and wire length) only showed a decrease of 30% as the circuit inductance increased by 60 times from 1.55 $Boxmathrm{H}$ (0.3 mm diameter, 19 MPa) to 93.2 $Boxmathrm{H}$ (0.2 mm diameter, 13 MPa). Hydrodynamic calculations based on a coupled model were used to explain the experimental results. These results indicated that for a practical UEWE system, long cable can be used to transfer the pulse current so that the energy storage can be far away from the load while keeping an acceptable loss of the capability of generating strong SWs, which greatly improves the flexibility of system designing for example by enabling much larger energy storage for certain harsh working environments.","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":"117200508","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

Analysis Of Experimental Multipactor Observation Signals Using Spark3D Software 利用Spark3D软件分析实验多因素观测信号

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717525

T. Sugai, Z. Shaw, J. Dickens, A. Neuber

{"title":"Analysis Of Experimental Multipactor Observation Signals Using Spark3D Software","authors":"T. Sugai, Z. Shaw, J. Dickens, A. Neuber","doi":"10.1109/ICOPS37625.2020.9717525","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717525","url":null,"abstract":"Multipactor is a resonant nonlinear electron multiplication effect that may occur in high power microwave devices at very low pressures, such as those operating in particle accelerators and satellite subsystems. Its effects range from signal degradation to the damage and destruction of microwave components. Thus, multipactor physics has been studied through theoretical analysis, numerical simulation, and experiment. Previously, we developed a direct electron observation system using an Electron Multiplier Tube (EMT) and succeeded to directly detect multipactoring electrons in the center of the broadwall of rectangular waveguides 1, 2. Here, we provide a method for evaluating the electric charge density and secondary emission yield (SEY) in waveguides. The experimentally obtained EMT signal is analyzed with the extensive usage of the numerical simulation software Spark3D. The software was utilized to analyze multipactor onset in waveguide structures, where the electric field distribution without multipactor was carefully simulated, employing high-frequency solvers. The EMT signal and the charge density were simulated for the same conditions as the experiment. As a result, a calibration line indicating the proportional relation between the EMT voltage and the charge density, which is independent of some conditions, i.e., input power and gap size, was obtained. Further, after adjusting the SEY curve imported to Spark3D, the rising shape of the experimental EMT signal pulses fit with the simulated one, and the experimental threshold power for the EMT signal generation was consistent with the simulated multipactor threshold power. Since the simulation matches the experiment in threshold power and signal shape, one expects that the charge density and SEY curve deduced from the simulation are accurate.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"78 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":"117242520","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

Estimation of Plasma Electron Density Inside the Radio Frequency Inductively Coupled Driver of Spider 蜘蛛射频电感耦合驱动器内等离子体电子密度的估计

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717701

P. Jain, M. Recchia, E. Gaio, A. Maistrello, G. Serianni, B. Zaniol

引用次数: 1

Pulsed Power Driven Underwater Wire Array Explosions and Their Use to Propel High Speed Flyer Plates 脉冲功率驱动水下线阵爆炸及其在高速飞片推进中的应用

2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717648

S. Bland, S. Theocharous, D. Yanuka, A. Rososhek, S. Efimov, Y. Krasik, M. Olbinado, A. Rack

引用次数: 0