2020 IEEE International Conference on Plasma Science (ICOPS)最新文献

{"title":"Controlled Harmonic Frequency Locking in the Harmonic Recirculating Planar Magnetron","authors":"D. Packard, N. Jordan, Y. Lau, R. Gilgenbach, B. Hoff","doi":"10.1109/ICOPS37625.2020.9717738","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717738","url":null,"abstract":"The Harmonic Recirculating Planar Magnetron (HRPM) is a variant of the Recirculating Planar Magnetron (RPM) [1] intended for generation of two or more frequencies simultaneously. Building on the Multi-Frequency Recirculating Planar Magnetron (MFRPM) [2], the HRPM modifies the planar geometry by placing an upstream L-Band Oscillator (LBO at ∼1 GHz) and downstream S-Band Oscillator (SBO at ∼2 GHz) on the same side of the cathode. The HRPM is a proof-of-principle magnetron prototype with the potential of generating four or more frequencies.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"2007 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":"125569245","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}

{"title":"Promotion of Amylase Productions from Aspergillus Oryzae Spores Exposed to Oxygen Radicals","authors":"Masafumi Ito, T. Goto, Motoyuki Shimizu, M. Kato, H. Hashizume, M. Hori","doi":"10.1109/ICOPS37625.2020.9717744","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717744","url":null,"abstract":"Recently, renewable energies become more important in realizing a low recycling society. Among them, bioethanol is drawing attention as an alternative to fossil fuels. The improvement of production rates of enzymes is expected to reduce the cost of them used in the saccharification process.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"16 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":"125579464","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}

{"title":"Developing a Low-Cost Depyrogenation Process Using Atmospheric Pressure Plasmas","authors":"Naman Bhatt, Duncan Trosan, Cade Brinkley, Joshua Pecoraro, K. Stapelmann, S. Shannon, Justin Brier-Jones, A. Crofton, Wolff Kirsch","doi":"10.1109/ICOPS37625.2020.9717798","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717798","url":null,"abstract":"Pyrogens, such as endotoxins, in pharmaceutical material have detrimental effects on patient well-being and can limit a material's viability for internal medicine applications. One such material that is widely used in internal medicine is chitosan. Chitosan is the second most abundant natural polymer which has various biomedical applications (drug delivery, gene therapy, tissue engineering, wound healing) and industrial applications (food processing, paper, agriculture, textile, solid-state batteries, cosmetics).","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"12 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":"123378492","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}

{"title":"A Computational Study of Streamers Interacting with Dielectrics","authors":"A. Sun, Xiaoran Li, J. Teunissen","doi":"10.1109/icops37625.2020.9717895","DOIUrl":"https://doi.org/10.1109/icops37625.2020.9717895","url":null,"abstract":"Electric discharges along dielectric materials are common phenomena in electronics and high-voltage equipment. We here developed a 2D plasma fluid model to study the dynamics of both positive and negative surface streamers. The model is based on the Afivo-streamer code1, and improved to include dielectrics2. We simulate the process of streamers interacting with dielectrics, including inception besides the dielectric, attaching to and propagation over the dielectric surface. The results show that both positive and negative streamers are attracted by dielectrics. After attaching to the dielectric, both of them become thinner and faster, and the maximum electric field and electron density at the streamer head become higher than in bulk gas. However, positive streamers attach to the dielectric more rapidly, and have higher electric field and propagation velocity than negative streamers. In addition, a zone with high electric field but low electron density presents between positive streamers and dielectric surfaces. However, for a negative surface streamer, the maximum electron density shows up near the interface, while a strong electric field area presents inside the dielectric around the streamer head.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"27 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":"121334393","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}

{"title":"An Ultra-Portable X-Pinch for Probing Warm Dense Matter","authors":"S. Bland, B. Krawczyk, T. Gheorghiu, H. Horton, P. Moloney, S. Parker, N. Schwartz, S. Stanislaus, J. Strucka, S. Theocharous, C. Wilson, J. Yan, Z. Zhao","doi":"10.1109/ICOPS37625.2020.9717726","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717726","url":null,"abstract":"Determining the properties of Warm Dense Matter (WDM) necessitates the use of advanced X-ray based diagnostics including diffraction and absorption spectrometry. As many experiments that produce WDM do so for only a few ns, the probing X-rays must be short pulsed, ideally with a high enough yield to produce data on a single experiment. They must also have the correct spectral characteristics – e.g. having a smooth continuum for absorption spectrometry. Such requirements often restrict experiments to large scale facilities like 3rd generation Synchrotrons and XFELs, which have exemplary capabilities, but can also have very limited time available for individual users.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"30 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":"126070591","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}

{"title":"Novel Features in Laser Plasma Interaction: Neutral Atom Acceleration and Electron Generation","authors":"M. Krishnamurthy","doi":"10.1109/ICOPS37625.2020.9717646","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717646","url":null,"abstract":"Intense laser pulse focused on solid substrate are well known to generate high density high temperature plasma. Electron and ion emission to a few MeV with laser intensities close to the relativistic intensities are well studied. The question we ask is about the possibility of tuning the compact charge particle acceleration schemes to generate neutral atoms beam of the energy same as that of ions. As intense laser-produced plasmas have been demonstrated to produce high-brightness-low-emittance beams, it is therefore possible to envisage generation of high-flux, low-emittance, high energy neutral atom beams in length scales of less than a millimeter [1]–[3]. We demonstrate a high energy neutral atom accelerator could significantly impact applications in neutral atom lithography and diagnostics.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"54 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":"126871682","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}

{"title":"The Child-Langmuir Law and the Physics of Diodes","authors":"Y. Lau","doi":"10.1109/ICOPS37625.2020.9717933","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717933","url":null,"abstract":"The Child-Langmuir Law (CL), discovered a century ago, gives the maximum current that can be transported across a planar diode in the steady state. It is central to the studies of high current diodes and high power microwave sources, vacuum microelectronics, electron and ion sources, and high current drivers used in high energy density physics experiments. This paper highlights some of the advances beyond the classical CL law, including extensions of CL to multiple dimensions, to the quantum regime, and to transient and ultrafast processes [1]. Crossed-field diodes, crucial to magnetic insulation, will be addressed. Also featured is the recent partial resolution [2] of an outstanding puzzle on the shape of Miram curves for thermionic cathodes [3], which show an unexpectedly gradual transition of the anode current from temperature-limited regime to space-charge-limited regime, as the cathode temperature is raised. This is an important consideration for thermal stability and long-cathode life, since most thermionic cathodes are operated in the vicinity of this smooth transition.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"79 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120905168","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}

{"title":"Cold Atmospheric Pressure Plasma Array for Biofilm Inactivation","authors":"Adam Croteau, A. White, Z. Kennedy, J. Carlson, Spencer Goering, Mariah Provost, M. Sullivan, K. Cornell, D. Plumlee, J. Browning","doi":"10.1109/ICOPS37625.2020.9717842","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717842","url":null,"abstract":"Cold atmospheric pressure (CAP) plasma has been shown to kill bacteria and remove biofilms. This could be useful in the food processing industry where microbial contamination of food contact surfaces are a source of foodborne illness. Single linear plasma discharge devices lack the spatial coverage that an array of discharges offers, and common plasma jet arrays require dithering or other means of movement to cover the same area. Our group has developed a CAP array assembled from multiple linear discharges that can be used to inactivate bacterial biofilms over large treatment areas. Each linear discharge consists of 2 opposing metal electrodes ($24 text{mm}times 1 text{mm}$) buried below $125 mumathrm{m}$ of Low Temperature Co-fired Ceramic (LTCC). The gap between electrodes is $750 mumathrm{m}$. These devices operate with an AC voltage (0.5-2 kV), an Argon gas flow (3–13 LPM), and a typical discharge current from a single element of 1–2 mA. To form arrays of discharge elements, stacks of linear discharge elements containing two opposing embedded electrodes are assembled. To ensure uniformity of the discharge elements, we have tested external ballast resistances of 1, 100, 200 $mathrm{k}Omega$, and demonstrated the importance of resistances between 100 $mathrm{k}Omega$ and 200 $mathrm{k}Omega$ on discharge uniformity. In a different configuration, internal ballast resistors are used. The HV AC electrodes can then share a common electrical connection so that only 2 wires are needed to drive the array elements in parallel. Internal ballast resistors, fabricated using a DuPont thick film resistor paste, are used to create $approx 150 mathrm{k}Omega$ resistors on the ground side of each discharge element embedded within the LTCC substrate. An 8 element discharge array has been demonstrated with an area of $29 text{mm}times 15 text{mm}$. The devices are designed for modularity when adding additional discharge elements. We demonstrate the effectiveness of these devices in inactivating common foodborne pathogens and spoilage organisms (E. coli, Pseudomonas, etc) in biofilms formed on steel, glass, and plastic substrates. We see a dramatic reduction in viable Colony Forming Units of >90% with short plasma treatment. These results will be presented.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"94 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":"121225951","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}

{"title":"Results on the Design and Testing of a Coaxial Multipactor Test Cell","authors":"S. Langellotti, N. Jordan, Y. Lau, R. Gilgenbach","doi":"10.1109/ICOPS37625.2020.9717653","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717653","url":null,"abstract":"Multipactor is a discharge phenomenon that causes multiplication of electrons inside microwave vacuum electronics. RF electric fields accelerate electrons into surfaces, releasing secondary electrons. This process is repeated with these secondary particles, which will generate an exponentially large electron population [1]. This charge buildup can lead to transmission-line loading, surface heating, or even catastrophic damage to the device [1], [2]. Multipactor is of particular concern in space-borne applications because of the extreme cost associated with repairing and replacing damaged satellite transmitters. Thus, it is necessary to develop methods for preventing multipactor discharges and for predicting when they will occur.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"6 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":"116659339","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}

{"title":"Research on the Ablation of Multiple Alloy Electrodes under the Effect Hundreds Ka Pulsed ARC","authors":"Kun Xie, Yinan Xin, Hongyu Dai, Lee Li","doi":"10.1109/ICOPS37625.2020.9717599","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717599","url":null,"abstract":"Air gap serves as the pivotal unit for the current conduction and arc interruption of gas gap switches. The pulsed current conducts energy through the arc plasma in the air gap, forming an instantaneous power deposition in the air gap. Different from the electrical contact in hundred-ampere-level, when the maximum power of the load device reaches up to several GW, and the peak current increases to hundreds of kiloampere, the “thermal erosion” and “shock force” of the arc plasma in the air gap are significantly enhanced. The high-energy arc plasma damages the electrode surface, and causes it to be eroded, sublimated, and sputtered. This study introduces the damage characteristics of different alloy materials under arc plasma. The extreme discharge condition with the peak current of 100kA is set. Compare the surface ablation of the cathode and anode in four commonly used electrode materials: tungsten copper, chromium copper, alloy steel, and aluminum oxide dispersion strengthened copper alloys (ODSC). The results show that the “fluidized” phenomenon is most obvious in ODSC, which is closely related to the shock wave of the plasma boundary. At the same time, the average mass loss of ODSC is also the largest. On the contrary, the tungsten copper electrode has the most uniform ablation on the macroscopic appearance. In regard to roughness of the surface. The alloy steel is in a “semi-spattered” state under the thermodynamic effect of the plasma with the current of 100 kA, that is, the metal droplets adhere to the electrode surface in a detached manner from the SEM result, t, making the roughness extremely large. The relative mass loss rate of chromium copper is the same as that of tungsten copper. However, due to the higher density, the absolute mass loss is slightly larger than that of tungsten copper electrode. Combined with the thermodynamic analysis of plasma under the condition of pulsed current, for 100kA pulsed arc, alloy steel and ODSC have some disadvantages in melting characteristics, but the performance of tungsten copper alloy is relatively stable. If the current further increases, chromium copper alloys may have greater potential.","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":"123807309","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}