Pub Date : 2008-05-19DOI: 10.1080/10519990802031331
A. K. Chattopadhyay
A stable and reliable Abel inversion code is developed for the calculation of the reconstruction of circularly symmetric two-dimensional functions from its projection. This technique differs from earlier methods by using Bessel function to expand the radial emissivity. The matrix inversion associated with the Abel inversion technique is achieved with the help of the singular value decomposition method. It is shown with the help of simulated data that Abel inversion by this technique generates a good reconstruction of the source functions and gives very good and accurate results for sparse data. A comparison is made with the results from other methods using both experimental noisy data and source functions with different amounts of noise added to them.
{"title":"Abel inversion using Bessel function as a radial basis function for sparse spectroscopic data","authors":"A. K. Chattopadhyay","doi":"10.1080/10519990802031331","DOIUrl":"https://doi.org/10.1080/10519990802031331","url":null,"abstract":"A stable and reliable Abel inversion code is developed for the calculation of the reconstruction of circularly symmetric two-dimensional functions from its projection. This technique differs from earlier methods by using Bessel function to expand the radial emissivity. The matrix inversion associated with the Abel inversion technique is achieved with the help of the singular value decomposition method. It is shown with the help of simulated data that Abel inversion by this technique generates a good reconstruction of the source functions and gives very good and accurate results for sparse data. A comparison is made with the results from other methods using both experimental noisy data and source functions with different amounts of noise added to them.","PeriodicalId":54600,"journal":{"name":"Plasma Devices and Operations","volume":"145 1","pages":"115 - 126"},"PeriodicalIF":0.0,"publicationDate":"2008-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10519990802031331","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72444164","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 : 2008-05-19DOI: 10.1080/10519990802018023
V. Amoskov, A. Belov, V. Belyakov, T. Belyakova, Y. Gribov, V. Kukhtin, E. Lamzin, S. Sytchevsky
A computation technology has been developed as a tool to provide accurate and detailed magnetostatic simulations for tokamaks. Calculation algorithms are described which allow modelling of complex magnet systems with regard to electromagnetic compatibility of their components and subsystems. The efficiency of the technology has been proved in computations of a typical test blanket module for the International Thermonuclear Experimental Reactor.
{"title":"Computation technology based on KOMPOT and KLONDIKE codes for magnetostatic simulations in tokamaks","authors":"V. Amoskov, A. Belov, V. Belyakov, T. Belyakova, Y. Gribov, V. Kukhtin, E. Lamzin, S. Sytchevsky","doi":"10.1080/10519990802018023","DOIUrl":"https://doi.org/10.1080/10519990802018023","url":null,"abstract":"A computation technology has been developed as a tool to provide accurate and detailed magnetostatic simulations for tokamaks. Calculation algorithms are described which allow modelling of complex magnet systems with regard to electromagnetic compatibility of their components and subsystems. The efficiency of the technology has been proved in computations of a typical test blanket module for the International Thermonuclear Experimental Reactor.","PeriodicalId":54600,"journal":{"name":"Plasma Devices and Operations","volume":"439 1","pages":"103 - 89"},"PeriodicalIF":0.0,"publicationDate":"2008-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86787984","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 : 2008-03-01DOI: 10.1080/10519990701702628
C. Artelt, M. Rott, W. Peukert, T. Höschen, K. Behringer, H. Bolt
A new pulsed coaxial plasma generator has been developed in order to allow particle generation in the quench of a propagating jet to be investigated. The related process provides an extremely transient environment which is characterized by initially high energy and charge densities, steep temperature gradients and short particle residence times. The combinations of high quench rates and high charge densities, which cannot be obtained in conventional reactors such as in flames or quasistationary plasmas, provide in fact a potential for ‘freezing’ of non-equilibrium phases and for tailoring particle characteristics by means of controlling particle–particle interactions. The pulsed plasma is characterized by determining the energy coupling, the charge density, the expansion behaviour and the evolution of temperature. Particle properties such as the primary particle size and aggregate structure are determined for various process parameters, namely the energy coupling, precursor injection and ambient pressure.
{"title":"Particle generation in pulsed plasmas","authors":"C. Artelt, M. Rott, W. Peukert, T. Höschen, K. Behringer, H. Bolt","doi":"10.1080/10519990701702628","DOIUrl":"https://doi.org/10.1080/10519990701702628","url":null,"abstract":"A new pulsed coaxial plasma generator has been developed in order to allow particle generation in the quench of a propagating jet to be investigated. The related process provides an extremely transient environment which is characterized by initially high energy and charge densities, steep temperature gradients and short particle residence times. The combinations of high quench rates and high charge densities, which cannot be obtained in conventional reactors such as in flames or quasistationary plasmas, provide in fact a potential for ‘freezing’ of non-equilibrium phases and for tailoring particle characteristics by means of controlling particle–particle interactions. The pulsed plasma is characterized by determining the energy coupling, the charge density, the expansion behaviour and the evolution of temperature. Particle properties such as the primary particle size and aggregate structure are determined for various process parameters, namely the energy coupling, precursor injection and ambient pressure.","PeriodicalId":54600,"journal":{"name":"Plasma Devices and Operations","volume":"1 1","pages":"11 - 24"},"PeriodicalIF":0.0,"publicationDate":"2008-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87802431","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 : 2008-03-01DOI: 10.1080/10519990701859196
G. Baranov, A. A. Kuchinsky, P. Tomashevich, S. Kotov, A. Vasil’ev
In this paper the design features and the results of studying an amplifier for a picosecond terawatt CO2-laser facility are given. The active medium of the amplifier (a CO2–N2–He gas mixture) is excited by a self-sustained volume discharge. The amplifier with an aperture of 0.1 m×0.1 m and with an active medium volume of 10 l provides the possibility for amplifying the 10 μ m radiation of a picosecond laser up to the terawatt power level. A volume discharge at a pressure of 10 atm and at a molecular gas content of 5% with a power input level of 80 J l−1 atm−1 was initiated. The optical gain constant of a small signal of the amplifier active medium was 0.027 cm−1 at a pressure of 8 atm, which confirms the possibility of high-pressure amplifier use as a final amplifier in picosecond CO2-laser facilities with a power output level of 1–10 TW.
{"title":"Laser amplifier for picosecond CO2 facilities of terawatt power level","authors":"G. Baranov, A. A. Kuchinsky, P. Tomashevich, S. Kotov, A. Vasil’ev","doi":"10.1080/10519990701859196","DOIUrl":"https://doi.org/10.1080/10519990701859196","url":null,"abstract":"In this paper the design features and the results of studying an amplifier for a picosecond terawatt CO2-laser facility are given. The active medium of the amplifier (a CO2–N2–He gas mixture) is excited by a self-sustained volume discharge. The amplifier with an aperture of 0.1 m×0.1 m and with an active medium volume of 10 l provides the possibility for amplifying the 10 μ m radiation of a picosecond laser up to the terawatt power level. A volume discharge at a pressure of 10 atm and at a molecular gas content of 5% with a power input level of 80 J l−1 atm−1 was initiated. The optical gain constant of a small signal of the amplifier active medium was 0.027 cm−1 at a pressure of 8 atm, which confirms the possibility of high-pressure amplifier use as a final amplifier in picosecond CO2-laser facilities with a power output level of 1–10 TW.","PeriodicalId":54600,"journal":{"name":"Plasma Devices and Operations","volume":"27 1","pages":"45 - 59"},"PeriodicalIF":0.0,"publicationDate":"2008-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80330900","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 : 2008-03-01DOI: 10.1080/10519990701750825
A. Gorodetsky, R. Zalavutdinov, S. P. Vnukov, V. Bukhovets, A. Zakharov, I. Mazul, A. Makhankov
In this paper an interaction of the inner dome surfaces of the International Thermonuclear Experimental Reactor with a gas mixture containing hydrocarbon radicals has been modelled. To study the processes of transport and deposition of methyl radicals in a C x H y –H2–H (x=1−3, y=1−6) flow, a stream technique has been used. A radiofrequency inductive discharge initiated in methane at the inlet of a quartz tube was a source of methyl and hydrogen atoms. Methyl radicals were transported by a gas flow that passed through cylindrical tungsten inserts and were deposited on the tube wall, on silicon samples and on tungsten samples, forming polymer-like hydrogenated amorphous carbon films. It has been shown that at the tungsten insert temperature increases to 420 K, and carbon deposition rate decreased significantly. However, in the gaseous phase the secondary hydrocarbon species accumulated and condensed on the tungsten surface at a temperature lower than 340 K.
本文模拟了国际热核实验堆内圆顶表面与含烃自由基气体混合物的相互作用。为了研究甲基自由基在C x H y -H2-H (x=1−3,y=1−6)流动中的迁移和沉积过程，采用了流技术。在石英管入口的甲烷中产生的射频感应放电是甲基和氢原子的来源。甲基自由基通过气体流动穿过圆柱形钨嵌套，沉积在管壁、硅样品和钨样品上，形成聚合物样氢化非晶碳膜。结果表明，当钨片温度升高到420 K时，积碳速率明显降低。而在气相中，在低于340 K的温度下，二次烃在钨表面聚集和凝聚。
{"title":"Methyl radical chemical reactions on a tungsten surface","authors":"A. Gorodetsky, R. Zalavutdinov, S. P. Vnukov, V. Bukhovets, A. Zakharov, I. Mazul, A. Makhankov","doi":"10.1080/10519990701750825","DOIUrl":"https://doi.org/10.1080/10519990701750825","url":null,"abstract":"In this paper an interaction of the inner dome surfaces of the International Thermonuclear Experimental Reactor with a gas mixture containing hydrocarbon radicals has been modelled. To study the processes of transport and deposition of methyl radicals in a C x H y –H2–H (x=1−3, y=1−6) flow, a stream technique has been used. A radiofrequency inductive discharge initiated in methane at the inlet of a quartz tube was a source of methyl and hydrogen atoms. Methyl radicals were transported by a gas flow that passed through cylindrical tungsten inserts and were deposited on the tube wall, on silicon samples and on tungsten samples, forming polymer-like hydrogenated amorphous carbon films. It has been shown that at the tungsten insert temperature increases to 420 K, and carbon deposition rate decreased significantly. However, in the gaseous phase the secondary hydrocarbon species accumulated and condensed on the tungsten surface at a temperature lower than 340 K.","PeriodicalId":54600,"journal":{"name":"Plasma Devices and Operations","volume":"32 1","pages":"25 - 35"},"PeriodicalIF":0.0,"publicationDate":"2008-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73971028","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 : 2008-03-01DOI: 10.1080/10519990701751823
A. Razmerov, V. Kapyshev, V. Kovalenko, A. Leshukov, S. Makarov, YU. Strebkov, M. Sviridenko
We present the safety analysis of a helium-cooled test module with a ceramic breeder performed to substantiate the test blanket module (TBM) safety in the scope required for the licensing of work on its fabrication and maintenance. For the postulated initial events of accidents the thermohydraulic parameters and stress-strained state of the TBM have been analysed. It was shown that the TBM parameters do not exceed the allowable values in normal operation and the safe operation limits during accidents.
{"title":"Analysis of accidents for substantiating the safety of a helium-cooled test module with a ceramic breeder","authors":"A. Razmerov, V. Kapyshev, V. Kovalenko, A. Leshukov, S. Makarov, YU. Strebkov, M. Sviridenko","doi":"10.1080/10519990701751823","DOIUrl":"https://doi.org/10.1080/10519990701751823","url":null,"abstract":"We present the safety analysis of a helium-cooled test module with a ceramic breeder performed to substantiate the test blanket module (TBM) safety in the scope required for the licensing of work on its fabrication and maintenance. For the postulated initial events of accidents the thermohydraulic parameters and stress-strained state of the TBM have been analysed. It was shown that the TBM parameters do not exceed the allowable values in normal operation and the safe operation limits during accidents.","PeriodicalId":54600,"journal":{"name":"Plasma Devices and Operations","volume":"10 6","pages":"37 - 44"},"PeriodicalIF":0.0,"publicationDate":"2008-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10519990701751823","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72467080","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 : 2008-03-01DOI: 10.1080/10519990701688025
V. Voitsenya, A. F. Bardamid, A. Belyaeva, V. N. Bondarenko, G. De Temmerman, V. Konovalov, M. Lipa, A. Litnovsky, I. Ryzhkov, B. Schunke
In this paper the results of post-mortem analysis of mirror samples (molybdenum, stainless steel and copper) exposed for the 1 year experimental campaign inside the Tore Supra tokamak are presented. The mirrors were not protected during the experiment and therefore were exposed both to glow discharge conditioning of the vessel walls and to working discharges. After exposure, all samples were found to be eroded and at the same time were coated with a thin contaminating deposit. We pay attention to the fact, that the observed erosion cannot be described using the published sputtering yields. In particular, the difference between the erosion of stainless steel and copper exceeded a factor of 10 and the difference between the erosion of stainless steel and molybdenum was less than a factor of 2 in comparison with the corresponding factors of approximately 2.5 and apprximately 10 known from the literature. An attempt is made to correlate these observations with the different sticking coefficients of carbon on to different substrates.
本文介绍了在托卡马克(Tore Supra tokamak)内进行了1年实验的镜面样品(钼、不锈钢和铜)的事后分析结果。在实验过程中，镜子没有受到保护，因此暴露在容器壁的辉光放电条件和工作放电中。暴露后，发现所有样品都被侵蚀，同时被一层薄薄的污染沉积物覆盖。我们注意到这样一个事实，即观察到的侵蚀不能用已公布的溅射产量来描述。特别是，不锈钢和铜之间的侵蚀差异超过10倍，不锈钢和钼之间的侵蚀差异小于2倍，而文献中已知的相应因素约为2.5倍和10倍。试图将这些观察结果与碳在不同基质上的不同粘附系数联系起来。
{"title":"Interpretation of Tore Supra in-vessel mirror experiments","authors":"V. Voitsenya, A. F. Bardamid, A. Belyaeva, V. N. Bondarenko, G. De Temmerman, V. Konovalov, M. Lipa, A. Litnovsky, I. Ryzhkov, B. Schunke","doi":"10.1080/10519990701688025","DOIUrl":"https://doi.org/10.1080/10519990701688025","url":null,"abstract":"In this paper the results of post-mortem analysis of mirror samples (molybdenum, stainless steel and copper) exposed for the 1 year experimental campaign inside the Tore Supra tokamak are presented. The mirrors were not protected during the experiment and therefore were exposed both to glow discharge conditioning of the vessel walls and to working discharges. After exposure, all samples were found to be eroded and at the same time were coated with a thin contaminating deposit. We pay attention to the fact, that the observed erosion cannot be described using the published sputtering yields. In particular, the difference between the erosion of stainless steel and copper exceeded a factor of 10 and the difference between the erosion of stainless steel and molybdenum was less than a factor of 2 in comparison with the corresponding factors of approximately 2.5 and apprximately 10 known from the literature. An attempt is made to correlate these observations with the different sticking coefficients of carbon on to different substrates.","PeriodicalId":54600,"journal":{"name":"Plasma Devices and Operations","volume":"9 1","pages":"1 - 10"},"PeriodicalIF":0.0,"publicationDate":"2008-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91008826","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 : 2008-03-01DOI: 10.1080/10519990701872306
V. I. Zaĭtsev, Yu. V. Andryanov, G. Volkov, Ye. V. Grabovsky, N. I. Lakhtyushko, A. Kartashov
The process of Z-pinch decay upon current termination is considered. The experimental data obtained for the Angara-5-1 facility on compression of multiwire tungsten liners are discussed. It is shown that among the decay products there are microparticles of the eroded liner construction material and plasma fluxes. It was determined that the plasma flow velocities exceeded the ‘thermal’ velocities of the Z-pinch plasma. A model for the description of the process of ion acceleration based on an ambipolar mechanism is suggested. Precautions for protection of the peripheral equipment against the decay products of Z-pinch are discussed and protective components are studied. A fast electromagnetic shutter is used for protection from microparticles.
{"title":"High-current Z-pinch disintegration and the problem of peripheral equipment protection","authors":"V. I. Zaĭtsev, Yu. V. Andryanov, G. Volkov, Ye. V. Grabovsky, N. I. Lakhtyushko, A. Kartashov","doi":"10.1080/10519990701872306","DOIUrl":"https://doi.org/10.1080/10519990701872306","url":null,"abstract":"The process of Z-pinch decay upon current termination is considered. The experimental data obtained for the Angara-5-1 facility on compression of multiwire tungsten liners are discussed. It is shown that among the decay products there are microparticles of the eroded liner construction material and plasma fluxes. It was determined that the plasma flow velocities exceeded the ‘thermal’ velocities of the Z-pinch plasma. A model for the description of the process of ion acceleration based on an ambipolar mechanism is suggested. Precautions for protection of the peripheral equipment against the decay products of Z-pinch are discussed and protective components are studied. A fast electromagnetic shutter is used for protection from microparticles.","PeriodicalId":54600,"journal":{"name":"Plasma Devices and Operations","volume":"59 1","pages":"61 - 66"},"PeriodicalIF":0.0,"publicationDate":"2008-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73316077","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 : 2007-10-24DOI: 10.1080/10519990701616901
V. Lukash, A. Kavin, Y. Gribov, R. Khayrutdinov, H. Fujieda
The paper presents the results of a study of the ITER 15 MA inductive Scenario 2 using self-consistent simulations performed with the DINA code. The primary goal was to develop poloidal field scenarios with an early transition from the limiter to divertor magnetic configuration. Such scenarios give the opportunity to reduce the heat flux to the limiters. An algorithm of the online control of the rate of plasma current ramp-up after formation of the divertor configuration (feedback control of the plasma internal inductance) is proposed for such scenarios. The study demonstrates the sensitivity of the resistive losses of the poloidal magnetic flux and the maximum duration of burn to a current at the X-point formation and to a waveform of plasma current ramp-up in the divertor magnetic configuration. It is demonstrated that the linear ramp-up of the plasma current after X-point formation is preferable.
{"title":"Simulations of ITER Scenario 2 with different schemes of current ramp-up","authors":"V. Lukash, A. Kavin, Y. Gribov, R. Khayrutdinov, H. Fujieda","doi":"10.1080/10519990701616901","DOIUrl":"https://doi.org/10.1080/10519990701616901","url":null,"abstract":"The paper presents the results of a study of the ITER 15 MA inductive Scenario 2 using self-consistent simulations performed with the DINA code. The primary goal was to develop poloidal field scenarios with an early transition from the limiter to divertor magnetic configuration. Such scenarios give the opportunity to reduce the heat flux to the limiters. An algorithm of the online control of the rate of plasma current ramp-up after formation of the divertor configuration (feedback control of the plasma internal inductance) is proposed for such scenarios. The study demonstrates the sensitivity of the resistive losses of the poloidal magnetic flux and the maximum duration of burn to a current at the X-point formation and to a waveform of plasma current ramp-up in the divertor magnetic configuration. It is demonstrated that the linear ramp-up of the plasma current after X-point formation is preferable.","PeriodicalId":54600,"journal":{"name":"Plasma Devices and Operations","volume":"53 4 1","pages":"283 - 297"},"PeriodicalIF":0.0,"publicationDate":"2007-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77882904","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 : 2007-10-24DOI: 10.1080/10519990701616877
M. Masoud, H. A. El-Gamal, H. A. El-tayeb, M. A. Hassouba, M. A. Abd Al-Halim
To overcome the discontinuity between the axial phase and the radial phase in the plasma focus, a new model (the Masoud model) has been developed. It is assumed that, according to the snowplough model, the radial phase moves in the angular direction with continuity between the axial and the radial phases. This model is based on the introduction of an angle of motion in all equations of motion and circuit. Then, the plasma sheath position and velocity were calculated numerically from the previous equations. A slug model has been used to calculate the shock wave velocity, and hence the electron temperature. Values of the discharge current, the axial speed, the axial position, the spike voltage, the radial piston speed, the radial piston position, the plasma column length and the plasma temperature have been obtained using the new model. The values calculated by using this model show good agreement with the published experimental results.
{"title":"Magnetohydrodynamic simulation for plasma focus devices","authors":"M. Masoud, H. A. El-Gamal, H. A. El-tayeb, M. A. Hassouba, M. A. Abd Al-Halim","doi":"10.1080/10519990701616877","DOIUrl":"https://doi.org/10.1080/10519990701616877","url":null,"abstract":"To overcome the discontinuity between the axial phase and the radial phase in the plasma focus, a new model (the Masoud model) has been developed. It is assumed that, according to the snowplough model, the radial phase moves in the angular direction with continuity between the axial and the radial phases. This model is based on the introduction of an angle of motion in all equations of motion and circuit. Then, the plasma sheath position and velocity were calculated numerically from the previous equations. A slug model has been used to calculate the shock wave velocity, and hence the electron temperature. Values of the discharge current, the axial speed, the axial position, the spike voltage, the radial piston speed, the radial piston position, the plasma column length and the plasma temperature have been obtained using the new model. The values calculated by using this model show good agreement with the published experimental results.","PeriodicalId":54600,"journal":{"name":"Plasma Devices and Operations","volume":"12 1","pages":"263 - 281"},"PeriodicalIF":0.0,"publicationDate":"2007-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84599374","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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