Pub Date : 1998-06-07DOI: 10.1109/BEAMS.1998.822412
S. Semushin, B. Etlicher
The complexity of physical problems in plasma demands special tools for its analysis. The primary source of data is, of coarse, the physical experiment. But, sufficiently complete comprehension of physical phenomenon is actually impossible without the numerical simulation, which is more and more often named as computational experiment. Moreover, computational experiment usually provides more complete set of data, which becomes credible only after verification by experiment. The processes under consideration (such as different Z-pinches, plasma opening switches-POS, plasma focus and others) have some common features. Fist of all, they are non-stationary and subjected to divers instabilities. Another common feature is a big difference in time and spatial scales, and small local details are very often significant for global process development. This means, that some kind of adaptation is inevitable for numerical simulations. Traditional lagrangian approach can be also considered as adaptation, based on the mass, but it is not applicable to the problems with high level of convection or mixing. Two numerical methods for MHD plasma simulation and corresponding codes are presented here. The first code ASTRE uses original adaptive mesh refinement algorithm, the other one, Z+ is based on classical arbitrary lagrangian-eulerian algorithm. These two approaches are complimentary. Each of them has its own advantages and specific application domains, but each of them covers the majority of the problems under consideration.
{"title":"Tools for MHD simulation of hot dense plasma","authors":"S. Semushin, B. Etlicher","doi":"10.1109/BEAMS.1998.822412","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.822412","url":null,"abstract":"The complexity of physical problems in plasma demands special tools for its analysis. The primary source of data is, of coarse, the physical experiment. But, sufficiently complete comprehension of physical phenomenon is actually impossible without the numerical simulation, which is more and more often named as computational experiment. Moreover, computational experiment usually provides more complete set of data, which becomes credible only after verification by experiment. The processes under consideration (such as different Z-pinches, plasma opening switches-POS, plasma focus and others) have some common features. Fist of all, they are non-stationary and subjected to divers instabilities. Another common feature is a big difference in time and spatial scales, and small local details are very often significant for global process development. This means, that some kind of adaptation is inevitable for numerical simulations. Traditional lagrangian approach can be also considered as adaptation, based on the mass, but it is not applicable to the problems with high level of convection or mixing. Two numerical methods for MHD plasma simulation and corresponding codes are presented here. The first code ASTRE uses original adaptive mesh refinement algorithm, the other one, Z+ is based on classical arbitrary lagrangian-eulerian algorithm. These two approaches are complimentary. Each of them has its own advantages and specific application domains, but each of them covers the majority of the problems under consideration.","PeriodicalId":410823,"journal":{"name":"12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128253533","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 : 1998-06-07DOI: 10.1109/BEAMS.1998.822464
M. Ayzatsky, A.N. Dovnya, P. Gladkikh, V. V. Zakutin, V. Kushnir, V. Mitrochenko, N.G. Reshetn'yak, V. P. Romas’ko, V. Pokas, Y. Tur
The problem of extending the life-time, of increasing the pulse and average power of many RF-sources is closely related to the design of their electron guns. As it is known, the magnetron injecting guns with secondary emission metallic cathodes (SEMI) are specified by the high current emission density and long life-time. The main goal of these investigations is to determine the advantages and limitations of using SEMIGs as the electron source in high-power RF devices and accelerator injector systems. At this stage we have studied some questions concerning the operational beam stability, voltage and current increasing. The experiments have been performed by using the experimental setup to investigate SEMIG linear electron beam parameters from single and multiple beams gun assemblies with the anode voltage up to 100 kV, pulse duration up to 10 /spl mu/s, repetition rate 50 Hz and 0.1-0.2 T magnetic field strength. Pulse-to-pulse long-term stability of the annular electron beams (internal diameter nearly equal to the cathode diameter, wide of ring 1-2 mm (wavelength of cyclotron oscillations)) with beam density up to 70 A/cm/sup 2/ (10/sup 10/-10/sup 11/ e/sup -//cm/sup 3/) have been achieved. It is shown, that the cathode diameter extension provides a proportionate increasing of the beam current, and in the case of multiple beam gun assemblies we have separate identical electron beams with the similar parameters of single-beam gun.
{"title":"Studying the electron beam characteristics of magnetron injection guns with a metal secondary emission cathode","authors":"M. Ayzatsky, A.N. Dovnya, P. Gladkikh, V. V. Zakutin, V. Kushnir, V. Mitrochenko, N.G. Reshetn'yak, V. P. Romas’ko, V. Pokas, Y. Tur","doi":"10.1109/BEAMS.1998.822464","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.822464","url":null,"abstract":"The problem of extending the life-time, of increasing the pulse and average power of many RF-sources is closely related to the design of their electron guns. As it is known, the magnetron injecting guns with secondary emission metallic cathodes (SEMI) are specified by the high current emission density and long life-time. The main goal of these investigations is to determine the advantages and limitations of using SEMIGs as the electron source in high-power RF devices and accelerator injector systems. At this stage we have studied some questions concerning the operational beam stability, voltage and current increasing. The experiments have been performed by using the experimental setup to investigate SEMIG linear electron beam parameters from single and multiple beams gun assemblies with the anode voltage up to 100 kV, pulse duration up to 10 /spl mu/s, repetition rate 50 Hz and 0.1-0.2 T magnetic field strength. Pulse-to-pulse long-term stability of the annular electron beams (internal diameter nearly equal to the cathode diameter, wide of ring 1-2 mm (wavelength of cyclotron oscillations)) with beam density up to 70 A/cm/sup 2/ (10/sup 10/-10/sup 11/ e/sup -//cm/sup 3/) have been achieved. It is shown, that the cathode diameter extension provides a proportionate increasing of the beam current, and in the case of multiple beam gun assemblies we have separate identical electron beams with the similar parameters of single-beam gun.","PeriodicalId":410823,"journal":{"name":"12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115092281","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 : 1998-06-07DOI: 10.1109/BEAMS.1998.822465
V. Engelko, V. Kuznetsov, G. Mueller, G. Viazmenova
When an electron source and a target are immersed in an external magnetic field electrons reflected from a target do not disappear but move along magnetic force lines to the source region where they are rereflected back to the target by the source electric field. Penetration of reflected electrons into the source can lead to distortion of the source electric field and through this to change of the limiting current density emitted by a cathode. Results of calculations of the limiting current density in the diode and triode schemes of an electron source in the presence of reflected electrons are presented. Density of the space charge of reflected electrons was calculated taking into account their real energy distribution obtained by means of Monte Carlo simulation. It was found that penetration of reflected electrons in the diode can decrease essentially the limiting current density. When electrons are reflected with the same energy the maximum lowering of the current density is as much as 3 for reflection coefficient k=1 and 2 for k=0.5. Real lowering of the current density for tungsten target is 1.5. Results of calculations are in a good agreement with experimental data. The analysis performed shows that consideration of reflected electrons is necessary for correct calculation of the beam power density at the target and the distribution of the energy density deposited into the target.
{"title":"Influence of electrons reflected from target on operation of diode and triode electron sources","authors":"V. Engelko, V. Kuznetsov, G. Mueller, G. Viazmenova","doi":"10.1109/BEAMS.1998.822465","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.822465","url":null,"abstract":"When an electron source and a target are immersed in an external magnetic field electrons reflected from a target do not disappear but move along magnetic force lines to the source region where they are rereflected back to the target by the source electric field. Penetration of reflected electrons into the source can lead to distortion of the source electric field and through this to change of the limiting current density emitted by a cathode. Results of calculations of the limiting current density in the diode and triode schemes of an electron source in the presence of reflected electrons are presented. Density of the space charge of reflected electrons was calculated taking into account their real energy distribution obtained by means of Monte Carlo simulation. It was found that penetration of reflected electrons in the diode can decrease essentially the limiting current density. When electrons are reflected with the same energy the maximum lowering of the current density is as much as 3 for reflection coefficient k=1 and 2 for k=0.5. Real lowering of the current density for tungsten target is 1.5. Results of calculations are in a good agreement with experimental data. The analysis performed shows that consideration of reflected electrons is necessary for correct calculation of the beam power density at the target and the distribution of the energy density deposited into the target.","PeriodicalId":410823,"journal":{"name":"12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114961711","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 : 1998-06-07DOI: 10.1109/BEAMS.1998.817007
S.P. Nikulin
Usually particles do not collide in the accelerating gap of ion sources, because the gas pressure in the gap should be low to provide a high electric strength. However, the gas discharge systems of the sources may allow for such gas conditions that the ion free path becomes comparable with dimensions of the systems. This is due to the pressure differential between the accelerating and gas-discharge systems of the sources and also to the fact that dimensions of the gas-discharge chambers may by far exceed the length of the accelerating gaps. Given these conditions, the relationships derived for the collisionless regime cannot be used to evaluate the ion current flowing from the discharge system to the accelerating gap. These relationships need be refined allowing for charge transfer. The goal of this study was to ascertain how collisions affect the value of the ion emission current over the pressure interval where the collisionless mode of the ion motion (the ion velocity is determined by the potential difference passed) is replaced by motion in a strong electric field (the ion velocity is proportional to the square root of the electric field intensity).
{"title":"Ion emission from plasma in the presence of charge transfer","authors":"S.P. Nikulin","doi":"10.1109/BEAMS.1998.817007","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.817007","url":null,"abstract":"Usually particles do not collide in the accelerating gap of ion sources, because the gas pressure in the gap should be low to provide a high electric strength. However, the gas discharge systems of the sources may allow for such gas conditions that the ion free path becomes comparable with dimensions of the systems. This is due to the pressure differential between the accelerating and gas-discharge systems of the sources and also to the fact that dimensions of the gas-discharge chambers may by far exceed the length of the accelerating gaps. Given these conditions, the relationships derived for the collisionless regime cannot be used to evaluate the ion current flowing from the discharge system to the accelerating gap. These relationships need be refined allowing for charge transfer. The goal of this study was to ascertain how collisions affect the value of the ion emission current over the pressure interval where the collisionless mode of the ion motion (the ion velocity is determined by the potential difference passed) is replaced by motion in a strong electric field (the ion velocity is proportional to the square root of the electric field intensity).","PeriodicalId":410823,"journal":{"name":"12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131205358","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 : 1998-06-07DOI: 10.1109/BEAMS.1998.816973
Zhimin Sung, Guozhi Liu, Yajun Fan, H. Shao
Based on the numerical simulation of the foilless diode presented, the following conclusions can be summarized. (1) At finite magnetic field, the effect of the shank emission on the electron beam could not be neglected. Although shank emission increases the beam current, it reduces the beam quality, which could be solved by increasing the applied magnetic field and decreasing the radial electric field at the cathode shank. (2) For the diode current, the beam equilibrium model is valid in ultra-relativistic case, while the space-charge-limited model is suitable for relatively low voltage.
{"title":"Numerical study of foilless diode","authors":"Zhimin Sung, Guozhi Liu, Yajun Fan, H. Shao","doi":"10.1109/BEAMS.1998.816973","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.816973","url":null,"abstract":"Based on the numerical simulation of the foilless diode presented, the following conclusions can be summarized. (1) At finite magnetic field, the effect of the shank emission on the electron beam could not be neglected. Although shank emission increases the beam current, it reduces the beam quality, which could be solved by increasing the applied magnetic field and decreasing the radial electric field at the cathode shank. (2) For the diode current, the beam equilibrium model is valid in ultra-relativistic case, while the space-charge-limited model is suitable for relatively low voltage.","PeriodicalId":410823,"journal":{"name":"12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133087284","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 : 1998-06-07DOI: 10.1109/BEAMS.1998.822401
P. Sprangle, B. Hafizi
Laser pulse propagation can be strongly influenced by nonlinear effects (relativistic and/or atomic electrons), ionization processes and finite pulse length effects. In this paper these processes are included in the analysis of the propagation and stability of intense laser pulses in plasmas. An envelope equation, which includes ionization and nonlinear effects, is derived and the spot size is found to be unstable to an ionization-modulation instability. Short laser pulses propagating in plasma channels are found to undergo an envelope modulation that is always damped in the front and initially grows in the back of the pulse. An example of laser wakefield acceleration to electron energies greater than 2, 5 GeV in a plasma channel is described.
{"title":"Optical guiding and stability of intense short laser pulses in plasma channels","authors":"P. Sprangle, B. Hafizi","doi":"10.1109/BEAMS.1998.822401","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.822401","url":null,"abstract":"Laser pulse propagation can be strongly influenced by nonlinear effects (relativistic and/or atomic electrons), ionization processes and finite pulse length effects. In this paper these processes are included in the analysis of the propagation and stability of intense laser pulses in plasmas. An envelope equation, which includes ionization and nonlinear effects, is derived and the spot size is found to be unstable to an ionization-modulation instability. Short laser pulses propagating in plasma channels are found to undergo an envelope modulation that is always damped in the front and initially grows in the back of the pulse. An example of laser wakefield acceleration to electron energies greater than 2, 5 GeV in a plasma channel is described.","PeriodicalId":410823,"journal":{"name":"12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114540415","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 : 1998-06-07DOI: 10.1109/BEAMS.1998.816966
M. Deichuly, V. Koshelev
Multiwave Cerenkov generators (MWCG) with overmoded two-sectional slow-wave structures (SWS) and different geometry of the output section have been investigated. MWCG with biperiodic output section has shown to have a remarkable property, and namely, microwave radiation power more weakly depends on the distance between electron beam and SWS surface than in MWCG with uniform section.
{"title":"MWCG with biperiodic output section","authors":"M. Deichuly, V. Koshelev","doi":"10.1109/BEAMS.1998.816966","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.816966","url":null,"abstract":"Multiwave Cerenkov generators (MWCG) with overmoded two-sectional slow-wave structures (SWS) and different geometry of the output section have been investigated. MWCG with biperiodic output section has shown to have a remarkable property, and namely, microwave radiation power more weakly depends on the distance between electron beam and SWS surface than in MWCG with uniform section.","PeriodicalId":410823,"journal":{"name":"12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115000444","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 : 1998-06-07DOI: 10.1109/BEAMS.1998.817028
V. Osipov, Y. Kotov, M. Ivanov, O. Samatov, S. Sokovnin, P. B. Smirnov
Our paper reports about YSZ powders production by successive evaporation and crystallization in the gas stream. In the laser applied the original method of active medium excitation was used. Efficiency of the laser constructed on the basis of this method reached 22% and specific power output /spl sim/1 W/cm/sup 3/. Pulsed regime is proved to be more efficient for active medium excitation and target evaporation then continuous one. Targets made from coarse YSZ powder with a Y/sub 2/O/sub 3/ content of 10.15 mol.% were evaporated and crystallized in a stream of cleaned air. Cubic-structure YSZ particles were obtained which had a shape close to spherical. Particle size distribution was close to a lognormal distribution with dg=10 nm and /spl sigma/=1.75. Specific surface of the powder was up to 70 m/sup 2//g, while the Y/sub 2/O/sub 3/ content reduced to 9.8 mol.%.
{"title":"Nanometer-sized YSZ powders production by means of target evaporation using high-efficient pulsed-repetitive CO/sub 2/-laser","authors":"V. Osipov, Y. Kotov, M. Ivanov, O. Samatov, S. Sokovnin, P. B. Smirnov","doi":"10.1109/BEAMS.1998.817028","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.817028","url":null,"abstract":"Our paper reports about YSZ powders production by successive evaporation and crystallization in the gas stream. In the laser applied the original method of active medium excitation was used. Efficiency of the laser constructed on the basis of this method reached 22% and specific power output /spl sim/1 W/cm/sup 3/. Pulsed regime is proved to be more efficient for active medium excitation and target evaporation then continuous one. Targets made from coarse YSZ powder with a Y/sub 2/O/sub 3/ content of 10.15 mol.% were evaporated and crystallized in a stream of cleaned air. Cubic-structure YSZ particles were obtained which had a shape close to spherical. Particle size distribution was close to a lognormal distribution with dg=10 nm and /spl sigma/=1.75. Specific surface of the powder was up to 70 m/sup 2//g, while the Y/sub 2/O/sub 3/ content reduced to 9.8 mol.%.","PeriodicalId":410823,"journal":{"name":"12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132735616","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 : 1998-06-07DOI: 10.1109/BEAMS.1998.816947
J. Benford, D. Price
Microwave generation in devices that depend on synchronization between an electron beam and a resonant cavity or slow wave structure can be disrupted by changes in either. Explosive-emission-driven microwave sources use plasma as the electron source in the diode. This plasma is conductive enough to act as the boundary for both the applied diode voltage and the microwave electric field. The motion of this plasma can effectively change the dimensions of either the electron beam diode or the cavity and will thereby cause resonance destruction. This shortens the microwave pulse length /spl tau//sub /spl mu//. Using simple models of cathode plasma motion and plasma speed dependence on diode current, we derive a scaling relation between microwave power and microwave pulse length. This general model of the process predicts that, for a Child-Langmuir diode, microwave power falls as P/spl prop//spl tau//sub /spl mu///sup -5/3/ and that pulse energy falls as E/spl prop//spl tau//sub /spl mu///sup -2/3/. Therefore, energy efficiency declines as the pulse length is extended. We compare with data from magnetrons, MILOs and BWOs, with good agreement. Explosive-emission-driven microwave sources are fundamentally limited by the speed of the diode plasma and can be improved by finding cathode materials that generate slower plasmas.
{"title":"General scaling of pulse shortening in explosive-emission-driven microwave sources","authors":"J. Benford, D. Price","doi":"10.1109/BEAMS.1998.816947","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.816947","url":null,"abstract":"Microwave generation in devices that depend on synchronization between an electron beam and a resonant cavity or slow wave structure can be disrupted by changes in either. Explosive-emission-driven microwave sources use plasma as the electron source in the diode. This plasma is conductive enough to act as the boundary for both the applied diode voltage and the microwave electric field. The motion of this plasma can effectively change the dimensions of either the electron beam diode or the cavity and will thereby cause resonance destruction. This shortens the microwave pulse length /spl tau//sub /spl mu//. Using simple models of cathode plasma motion and plasma speed dependence on diode current, we derive a scaling relation between microwave power and microwave pulse length. This general model of the process predicts that, for a Child-Langmuir diode, microwave power falls as P/spl prop//spl tau//sub /spl mu///sup -5/3/ and that pulse energy falls as E/spl prop//spl tau//sub /spl mu///sup -2/3/. Therefore, energy efficiency declines as the pulse length is extended. We compare with data from magnetrons, MILOs and BWOs, with good agreement. Explosive-emission-driven microwave sources are fundamentally limited by the speed of the diode plasma and can be improved by finding cathode materials that generate slower plasmas.","PeriodicalId":410823,"journal":{"name":"12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133457294","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 : 1998-06-07DOI: 10.1109/BEAMS.1998.816980
V. Perevodchikov, Y. Kuznetzov, L. Mitin, A. Shapiro, M. Zavjalov
The quality characteristics of amplification of a plasma travelling wave tube (TWT) are studied. It was shown that linearity, phase stability, the level of combined frequency signals and noise are close to the characteristics of a vacuum TWT. A plasma TWT has higher power and wider range of operating frequency band. A plasma TWT-based power small-sized amplifier is discussed.
{"title":"Investigation of plasma-beam amplifiers with reference to use in communication systems","authors":"V. Perevodchikov, Y. Kuznetzov, L. Mitin, A. Shapiro, M. Zavjalov","doi":"10.1109/BEAMS.1998.816980","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.816980","url":null,"abstract":"The quality characteristics of amplification of a plasma travelling wave tube (TWT) are studied. It was shown that linearity, phase stability, the level of combined frequency signals and noise are close to the characteristics of a vacuum TWT. A plasma TWT has higher power and wider range of operating frequency band. A plasma TWT-based power small-sized amplifier is discussed.","PeriodicalId":410823,"journal":{"name":"12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121913035","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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