Pub Date : 1998-06-07DOI: 10.1109/BEAMS.1998.816969
A. Kuftin, V. Zapevalov
The basic properties (velocity spread, average oscillatory energy and oscillatory velocity distribution function) of helical electron beams (HEB) formed in the magnetron-injection gun (MIG) of powerful millimeter wave range gyrotrons are investigated experimentally at the presence of electrons, reflected by the magnetic mirror and locked in adiabatic trap. Guns for 83 GHz, 110 GHz, 140 GHz and 170 GHz, 1 MW power level gyrotrons, forming quasilaminar, regularly intersecting, mixed and boundary HEB (between quasilaminar and regularly intersecting HEB) are considered. The results of the experiments show that the trapped electrons significantly affect the beam parameters.
{"title":"Experimental study of trapped electrons influence on the helical electron beam parameters for millimeter wave range gyrotrons","authors":"A. Kuftin, V. Zapevalov","doi":"10.1109/BEAMS.1998.816969","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.816969","url":null,"abstract":"The basic properties (velocity spread, average oscillatory energy and oscillatory velocity distribution function) of helical electron beams (HEB) formed in the magnetron-injection gun (MIG) of powerful millimeter wave range gyrotrons are investigated experimentally at the presence of electrons, reflected by the magnetic mirror and locked in adiabatic trap. Guns for 83 GHz, 110 GHz, 140 GHz and 170 GHz, 1 MW power level gyrotrons, forming quasilaminar, regularly intersecting, mixed and boundary HEB (between quasilaminar and regularly intersecting HEB) are considered. The results of the experiments show that the trapped electrons significantly affect the beam parameters.","PeriodicalId":410823,"journal":{"name":"12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)","volume":"20 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":"127332825","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.1998.816983
A. Arzhannikov, V. Bychenkov, J. Eibl, P. V. Kalinin, G. Kessler, V. S. Koidan, G. Kovalenko, Y. Lazarev, K. Mekler, P. Petrov, A. Petrovtsev
A potential cleaning method for polluted construction surfaces by high-power pulses of microwave radiation may be based on the destruction of a surface thin layer by the action of shock waves generated due to dissipation of microwave energy. When defining the possibility of concrete plane layer destruction by a high-power microwave radiation flux it should be stressed that dry concrete (being a dielectric material) conducts electromagnetic radiation rather well (specific resistance is more than 10/sup 3/ Ohm.m), but shock wave generation and fragment formation under its action occurs most intensively for local energy release. The main prime problem is to create a small region in a material capable under microwave pulses to generate a shock wave which has the ability to cause fragmentation on a sample surface. Such a region should have increased conductivity which ensures the creation of the region with high energy density. The creation of such a region can be available, for example, by saturation of the concrete surface with a conductive salt solution, as it is known that concrete has a water absorption from 4-8% up to 30-40% of its mass. Current experiments show that the specific resistance of a concrete region is equal to 50 Ohm. m, and the skin length, corresponding to 4 mm wavelength electromagnetic radiation, is 1.2 cm.
{"title":"On the possibility of concrete destruction under high-power microwaves generated by e-beam","authors":"A. Arzhannikov, V. Bychenkov, J. Eibl, P. V. Kalinin, G. Kessler, V. S. Koidan, G. Kovalenko, Y. Lazarev, K. Mekler, P. Petrov, A. Petrovtsev","doi":"10.1109/BEAMS.1998.816983","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.816983","url":null,"abstract":"A potential cleaning method for polluted construction surfaces by high-power pulses of microwave radiation may be based on the destruction of a surface thin layer by the action of shock waves generated due to dissipation of microwave energy. When defining the possibility of concrete plane layer destruction by a high-power microwave radiation flux it should be stressed that dry concrete (being a dielectric material) conducts electromagnetic radiation rather well (specific resistance is more than 10/sup 3/ Ohm.m), but shock wave generation and fragment formation under its action occurs most intensively for local energy release. The main prime problem is to create a small region in a material capable under microwave pulses to generate a shock wave which has the ability to cause fragmentation on a sample surface. Such a region should have increased conductivity which ensures the creation of the region with high energy density. The creation of such a region can be available, for example, by saturation of the concrete surface with a conductive salt solution, as it is known that concrete has a water absorption from 4-8% up to 30-40% of its mass. Current experiments show that the specific resistance of a concrete region is equal to 50 Ohm. m, and the skin length, corresponding to 4 mm wavelength electromagnetic radiation, is 1.2 cm.","PeriodicalId":410823,"journal":{"name":"12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)","volume":"5 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":"124935868","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.1998.816994
A. Agafonov, V. M. Fedorov, V. Tarakanov
Problems of magnetic insulation violation inside a vacuum coaxial diode with dense electron flow are considered from the point of view of the development as low-voltage as high-efficiency relativistic magnetrons with secondary emission cathode. The numerical model of nonstationary nonuniform secondary electron emission from a cathode was developed. The results of computer simulations of an electron clouds formation due to nonlinear azimuthal instability under the condition of strong nonuniform secondary self-sustaining emission are described.
{"title":"Electron beam modulation and leakage currents during self-sustaining secondary emission in magnetron guns","authors":"A. Agafonov, V. M. Fedorov, V. Tarakanov","doi":"10.1109/BEAMS.1998.816994","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.816994","url":null,"abstract":"Problems of magnetic insulation violation inside a vacuum coaxial diode with dense electron flow are considered from the point of view of the development as low-voltage as high-efficiency relativistic magnetrons with secondary emission cathode. The numerical model of nonstationary nonuniform secondary electron emission from a cathode was developed. The results of computer simulations of an electron clouds formation due to nonlinear azimuthal instability under the condition of strong nonuniform secondary self-sustaining emission are described.","PeriodicalId":410823,"journal":{"name":"12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)","volume":"65 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":"125774170","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.1998.816977
B. Maly, J. Nation, L. Schachter
The energy carried by density modulated electron beams with low spread in velocity can be converted into high power microwave radiation with high efficiency. The density modulated beam is generated by applying both RF and DC fields. This is possible in an open cavity that consists of a Bragg reflector region. The authors examine the conditions for beam generation taking into account regular field emission (Fowler-Nordheim) and space-charge effects. The concept is demonstrated when a density modulated beam is injected in a tapered traveling wave structure; simulations indicate that the highest efficiency is achieved when in the first 15% of the interaction region the phase velocity of the wave is higher than the average velocity of the electrons.
{"title":"Generation of density modulated electron beam in an open resonator","authors":"B. Maly, J. Nation, L. Schachter","doi":"10.1109/BEAMS.1998.816977","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.816977","url":null,"abstract":"The energy carried by density modulated electron beams with low spread in velocity can be converted into high power microwave radiation with high efficiency. The density modulated beam is generated by applying both RF and DC fields. This is possible in an open cavity that consists of a Bragg reflector region. The authors examine the conditions for beam generation taking into account regular field emission (Fowler-Nordheim) and space-charge effects. The concept is demonstrated when a density modulated beam is injected in a tapered traveling wave structure; simulations indicate that the highest efficiency is achieved when in the first 15% of the interaction region the phase velocity of the wave is higher than the average velocity of the electrons.","PeriodicalId":410823,"journal":{"name":"12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)","volume":"45 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":"115034187","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.1998.816975
A. Kuftin, V. Lygin, V. Manuilov
The results of non-stationary simulation of helical electron beams (HEBs) parameters based on the PIC method and quasi-stationary model of electric field are presented. The beam types with different topology (laminar, boundary, regular intersecting) are considered. The evolution of the oscillatory velocity distribution is investigated. The space charge value of locked into adiabatic trap electrons and their life-time are obtained. The bombardment of the cathode by reflected electrons is studied.
{"title":"Non-stationary simulation of the gyrotron helical electron beams","authors":"A. Kuftin, V. Lygin, V. Manuilov","doi":"10.1109/BEAMS.1998.816975","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.816975","url":null,"abstract":"The results of non-stationary simulation of helical electron beams (HEBs) parameters based on the PIC method and quasi-stationary model of electric field are presented. The beam types with different topology (laminar, boundary, regular intersecting) are considered. The evolution of the oscillatory velocity distribution is investigated. The space charge value of locked into adiabatic trap electrons and their life-time are obtained. The bombardment of the cathode by reflected electrons is studied.","PeriodicalId":410823,"journal":{"name":"12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)","volume":"49 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":"122508109","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.1998.816990
E. Schamiloglu, F. Hegeler, C. Grabowski, D. Borovina
The University of New Mexico (UNM) long pulse backward wave oscillator (BWO) experiment has been investigating three issues: (i) the observation of axial mode switching during the course of microwave generation in vacuum, (ii) the use of laser interferometry to correlate the evolution of wall plasma with pulse shortening during operation in vacuum, and (iii) the effects of a controlled plasma prefill from a cathode-mounted plasma source on BWO output characteristics. Results-to-date from our investigations indicate that a cross-excitation instability is observed under certain operating conditions during vacuum operation. This instability depends on three parameters: (i) the normalized slow wave structure length, (ii) the ratio of electron beam current to start-oscillation current, and (iii) the reflection coefficient at the downstream end of the electrodynamic system. Furthermore, a HeNe laser interferometer indicates that plasma appears in two phases during the course of vacuum operation. The initial low density phase I plasma is attributed to beam scrape-off from the cutoff neck region at the input to the electrodynamic system. A significantly higher phase II plasma is measured after the occurrence of pulse shortening, and the magnitude of this plasma is correlated with the radiated microwave power level. We believe this plasma is attributed to a catastrophic discharge occurring during very high power excitation. Finally, the intentional prefill of the slow wave structure with a preionized plasma emanating from the cathode is found to both enhance microwave generation efficiency, and quench the radiated power, depending on the density of the plasma prefill.
{"title":"Recent results from a long pulse, relativistic vacuum and plasma-filled backward wave oscillator experiment","authors":"E. Schamiloglu, F. Hegeler, C. Grabowski, D. Borovina","doi":"10.1109/BEAMS.1998.816990","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.816990","url":null,"abstract":"The University of New Mexico (UNM) long pulse backward wave oscillator (BWO) experiment has been investigating three issues: (i) the observation of axial mode switching during the course of microwave generation in vacuum, (ii) the use of laser interferometry to correlate the evolution of wall plasma with pulse shortening during operation in vacuum, and (iii) the effects of a controlled plasma prefill from a cathode-mounted plasma source on BWO output characteristics. Results-to-date from our investigations indicate that a cross-excitation instability is observed under certain operating conditions during vacuum operation. This instability depends on three parameters: (i) the normalized slow wave structure length, (ii) the ratio of electron beam current to start-oscillation current, and (iii) the reflection coefficient at the downstream end of the electrodynamic system. Furthermore, a HeNe laser interferometer indicates that plasma appears in two phases during the course of vacuum operation. The initial low density phase I plasma is attributed to beam scrape-off from the cutoff neck region at the input to the electrodynamic system. A significantly higher phase II plasma is measured after the occurrence of pulse shortening, and the magnitude of this plasma is correlated with the radiated microwave power level. We believe this plasma is attributed to a catastrophic discharge occurring during very high power excitation. Finally, the intentional prefill of the slow wave structure with a preionized plasma emanating from the cathode is found to both enhance microwave generation efficiency, and quench the radiated power, depending on the density of the plasma prefill.","PeriodicalId":410823,"journal":{"name":"12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)","volume":"1 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":"116753575","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.1998.816948
J. Benford, D. Price, W. DeHope
We have demonstrated reduced CsI plasma speed for macroscopic electric fields of up to 285 kV/cm with cesium iodide-coated (CsI) carbon fiber cathodes, sufficient for the diodes of GW microwave sources. Plasma speeds is 0.6/spl times/10/sup 6/ cm/sec, 3.5 times less than the bare carbon fiber. The apparatus had oil-free high vacuum conditions (metal seals and glass insulator) and the cathode was baked both before assembly at atmospheric pressure and in vacuum after assembly, to temperatures of >600/spl deg/C. A residual gas analyzer showed burnout of the water; base pressure was /spl sim/10/sup -6/ Torr. An unexpected benefit of the CsI coating is that diode current and voltage traces are substantially more reproducible than with bare carbon fiber. With reduced plasma velocity, CsI cathodes should produce an extension of the HPM pulse length and an increase in pulse energy by a substantial factor in sources now limited by low-Z contaminant cathode plasma motion.
{"title":"Lowered plasma velocity with cesium iodide/carbon fiber cathodes at high electric fields","authors":"J. Benford, D. Price, W. DeHope","doi":"10.1109/BEAMS.1998.816948","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.816948","url":null,"abstract":"We have demonstrated reduced CsI plasma speed for macroscopic electric fields of up to 285 kV/cm with cesium iodide-coated (CsI) carbon fiber cathodes, sufficient for the diodes of GW microwave sources. Plasma speeds is 0.6/spl times/10/sup 6/ cm/sec, 3.5 times less than the bare carbon fiber. The apparatus had oil-free high vacuum conditions (metal seals and glass insulator) and the cathode was baked both before assembly at atmospheric pressure and in vacuum after assembly, to temperatures of >600/spl deg/C. A residual gas analyzer showed burnout of the water; base pressure was /spl sim/10/sup -6/ Torr. An unexpected benefit of the CsI coating is that diode current and voltage traces are substantially more reproducible than with bare carbon fiber. With reduced plasma velocity, CsI cathodes should produce an extension of the HPM pulse length and an increase in pulse energy by a substantial factor in sources now limited by low-Z contaminant cathode plasma motion.","PeriodicalId":410823,"journal":{"name":"12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)","volume":"51 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":"128545877","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.1998.822479
M. Glyavin, A. Kuftin, A. Postnikova, N. P. Venediktov, M. V. Yulpatova, V. Zapevalov, I.E. Zasypkina
In gyrotrons, i.e. sources of powerful (up to 1 MW and higher) coherent microwave radiation the electron beam is formed by a magnetron-injection gun that operates in the regime of temperature limitation set for emission current and with the electric field at the cathode, which is but insignificantly weakened by the field of the spatial charge. Optimization of electron-optical systems in gyrotrons is made more complicated due to strict requirements for homogeneity of helical electron beams and low velocity spread of electrons in the beam. Worse homogeneity of the electron flow leads to a sharp decrease in efficiency or appearance of various instabilities resulting in a break of oscillations. Optimization of parameters of gyrotron guns requires a detailed analysis of many physical processes in the electron-optical system of a gyrotron and application of complex mathematical models.
{"title":"A diagnostic of gyrotron cathodes quality based on their current-voltage characteristics","authors":"M. Glyavin, A. Kuftin, A. Postnikova, N. P. Venediktov, M. V. Yulpatova, V. Zapevalov, I.E. Zasypkina","doi":"10.1109/BEAMS.1998.822479","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.822479","url":null,"abstract":"In gyrotrons, i.e. sources of powerful (up to 1 MW and higher) coherent microwave radiation the electron beam is formed by a magnetron-injection gun that operates in the regime of temperature limitation set for emission current and with the electric field at the cathode, which is but insignificantly weakened by the field of the spatial charge. Optimization of electron-optical systems in gyrotrons is made more complicated due to strict requirements for homogeneity of helical electron beams and low velocity spread of electrons in the beam. Worse homogeneity of the electron flow leads to a sharp decrease in efficiency or appearance of various instabilities resulting in a break of oscillations. Optimization of parameters of gyrotron guns requires a detailed analysis of many physical processes in the electron-optical system of a gyrotron and application of complex mathematical models.","PeriodicalId":410823,"journal":{"name":"12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)","volume":"109 6 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":"129062184","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.1998.817017
G.I. Dolgachev, M.S. Nitishinsky, A. Ushakov
Repetitive POS technology recently developed in the Kurchatov Institute may be applicable for various technology uses. Together with existing 2-3 MV 10-50 kW X-ray systems, a new facility operating in electron beam mode was recently developed for radiation sterilization applications. This compact system possesses 0.5-1 kJ/shot in electron beam of 0.5-0.8 MeV depending on the initial Marx charging voltage and may repetitively perform at 1 Hz frequency. Electron beam creates 1-10 kGy/shot in a surface layers of irradiated substances with dose rate at 5 GGy/s.
{"title":"Air injected high power repetitive electron beam for radiation treatment","authors":"G.I. Dolgachev, M.S. Nitishinsky, A. Ushakov","doi":"10.1109/BEAMS.1998.817017","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.817017","url":null,"abstract":"Repetitive POS technology recently developed in the Kurchatov Institute may be applicable for various technology uses. Together with existing 2-3 MV 10-50 kW X-ray systems, a new facility operating in electron beam mode was recently developed for radiation sterilization applications. This compact system possesses 0.5-1 kJ/shot in electron beam of 0.5-0.8 MeV depending on the initial Marx charging voltage and may repetitively perform at 1 Hz frequency. Electron beam creates 1-10 kGy/shot in a surface layers of irradiated substances with dose rate at 5 GGy/s.","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":"130580853","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.1998.817005
N. G. Belova, V. I. Karas, O. Shulika
The authors carried out systematic investigations of the dynamics of relativistic electron and nonrelativistic ion beam propagation in both an electric field and an axisymmetric nonuniform magnetic field. In previous papers, the investigation results of the acceleration, and the charge and current compensation of HHCIBs in one and two linac cusps are reported. These results have shown that both in the presence and in the absence of an accelerating electric field, the following effects take place: (1) charge and current compensation of HHCIB in the accelerating gaps, (2) stability of the ion beam during times that substantially exceed the inverse ion Langmuir and Larmor frequencies. The performed numerical simulations have also shown that a required charge neutralization of the ion beam is only achieved within accelerating gaps of linac. This investigation is directed towards: (1) reaching of the optimal relation between the external electric field parameters and the compensating electron beam parameters; (2) defining of the optimal thickness of annular beam at which the ion beam is effectively accelerated and at a time is remaining compensated and not losing a stability.
{"title":"Charge compensation and acceleration of a thick-walled high-current ion beam in induction linac","authors":"N. G. Belova, V. I. Karas, O. Shulika","doi":"10.1109/BEAMS.1998.817005","DOIUrl":"https://doi.org/10.1109/BEAMS.1998.817005","url":null,"abstract":"The authors carried out systematic investigations of the dynamics of relativistic electron and nonrelativistic ion beam propagation in both an electric field and an axisymmetric nonuniform magnetic field. In previous papers, the investigation results of the acceleration, and the charge and current compensation of HHCIBs in one and two linac cusps are reported. These results have shown that both in the presence and in the absence of an accelerating electric field, the following effects take place: (1) charge and current compensation of HHCIB in the accelerating gaps, (2) stability of the ion beam during times that substantially exceed the inverse ion Langmuir and Larmor frequencies. The performed numerical simulations have also shown that a required charge neutralization of the ion beam is only achieved within accelerating gaps of linac. This investigation is directed towards: (1) reaching of the optimal relation between the external electric field parameters and the compensating electron beam parameters; (2) defining of the optimal thickness of annular beam at which the ion beam is effectively accelerated and at a time is remaining compensated and not losing a stability.","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":"124200170","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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