Pub Date : 1989-05-22DOI: 10.1109/PLASMA.1989.166140
A. Bortolotti, J. Brzosko, A. Fuschini, V. Nardi, C. Powell
High nuclear reactivity within submillimetric domains in the space structure of the pinch of focused discharges has been studied. The authors report on experiments that describe the emission of D/sup +/ beams and the occurrence of such nuclear fusion reactions for W=5-10 kJ plasma focus (PF) machines operating in the neutron-optimized mode. The results indicate that localized high-density plasma domains of 100- mu m diameter, n/sub i/>or=10/sup 21/ cm/sup -3/, and tau =1-5 ns contribute to the bulk ( approximately 70%) of the observed fusion reactions in the machines. The generality of the observations indicates that the same conclusion is valid for optimized PF machines with any value of W.<>
{"title":"Microsources of intense fusion in focused discharges of plasma focus","authors":"A. Bortolotti, J. Brzosko, A. Fuschini, V. Nardi, C. Powell","doi":"10.1109/PLASMA.1989.166140","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166140","url":null,"abstract":"High nuclear reactivity within submillimetric domains in the space structure of the pinch of focused discharges has been studied. The authors report on experiments that describe the emission of D/sup +/ beams and the occurrence of such nuclear fusion reactions for W=5-10 kJ plasma focus (PF) machines operating in the neutron-optimized mode. The results indicate that localized high-density plasma domains of 100- mu m diameter, n/sub i/>or=10/sup 21/ cm/sup -3/, and tau =1-5 ns contribute to the bulk ( approximately 70%) of the observed fusion reactions in the machines. The generality of the observations indicates that the same conclusion is valid for optimized PF machines with any value of W.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131731122","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 : 1989-05-22DOI: 10.1109/PLASMA.1989.166115
M. Galvez, C. Barnes, G. Gisler
Summary form only. A two-dimensional electrostatic particle-in-cell code has been used to simulate the convection of a finite slab of neutral plasma across a uniform magnetic field. The simulations show that the plasma is convected with a velocity that approaches the injection velocity for denser plasmas. The plasma loses p/sub y/ momentum with distance due to erosion effects. Three mechanisms that cause erosion of the plasma have been identified: (1) the erosion of the charge layers due to the velocity shear, (2) the erosion of the charge layers due to their expansion along the magnetic field lines, and (3) the erosion of the head of the stream due to Larmor-radius effects. The simulations have also shown that these erosions have greater effect for denser plasmas. The electron charge layer is subject to the dicotron instability: the head of the stream broadens and shows a flutelike instability, and the tail of the stream narrows due to electric field fringe effects. When the plasma streams across a magnetized plasma, these erosion effects are diminished due to the short circuiting of the electric field by the background plasma. However, the convection velocity decreases with distance until the plasma stream is stopped.<>
{"title":"Computer simulations of finite plasmas convected across magnetized plasmas","authors":"M. Galvez, C. Barnes, G. Gisler","doi":"10.1109/PLASMA.1989.166115","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166115","url":null,"abstract":"Summary form only. A two-dimensional electrostatic particle-in-cell code has been used to simulate the convection of a finite slab of neutral plasma across a uniform magnetic field. The simulations show that the plasma is convected with a velocity that approaches the injection velocity for denser plasmas. The plasma loses p/sub y/ momentum with distance due to erosion effects. Three mechanisms that cause erosion of the plasma have been identified: (1) the erosion of the charge layers due to the velocity shear, (2) the erosion of the charge layers due to their expansion along the magnetic field lines, and (3) the erosion of the head of the stream due to Larmor-radius effects. The simulations have also shown that these erosions have greater effect for denser plasmas. The electron charge layer is subject to the dicotron instability: the head of the stream broadens and shows a flutelike instability, and the tail of the stream narrows due to electric field fringe effects. When the plasma streams across a magnetized plasma, these erosion effects are diminished due to the short circuiting of the electric field by the background plasma. However, the convection velocity decreases with distance until the plasma stream is stopped.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134115971","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 : 1989-05-22DOI: 10.1109/PLASMA.1989.166077
C. Golkowski, G. Kerslick, J. Nation
A 1-MV, 6-kA, 50-ns annular proton beam has been generated in a full-cusp-geometry diode and transported along a 0.6-T solenoidal magnetic field. The radial profile and transport efficiency were measured under different drift tube conditions using carbon activation. Faraday cup arrays gave time-resolved measurements of the net and ion current densities. The measurements showed that successful transport can be achieved by using a fast puff valve to fill the drift region immediately downstream of the full cusp with neutral gas. The exact neutralization process is still being studied, but it is thought that the plasma created from the neutral gas allows electrons to be pulled from the drift tube walls, neutralizing the space charge of the ion beam. Results have demonstrated beam transport efficiencies of 99% and maintenance of the annular beam profile throughout the drift region. The results have implications for the development of multistage induction accelerators.<>
在全尖端几何二极管中产生了1 mv, 6 ka, 50 ns的环形质子束，并沿0.6 t的螺线管磁场传输。采用活性炭活化法测定了不同漂移管条件下的径向分布和输运效率。法拉第杯阵列对净电流和离子电流密度进行了时间分辨测量。测量结果表明，通过使用快速抽气阀将中性气体填充在完全尖端下游的漂移区域，可以实现成功的输运。确切的中和过程仍在研究中，但据认为，由中性气体产生的等离子体允许电子从漂移管壁上被拉出来，中和离子束的空间电荷。结果表明，光束传输效率为99%，并在整个漂移区域保持环形光束轮廓。研究结果对多级感应加速器的发展具有指导意义
{"title":"High current proton beams in multi-stage linear induction accelerators","authors":"C. Golkowski, G. Kerslick, J. Nation","doi":"10.1109/PLASMA.1989.166077","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166077","url":null,"abstract":"A 1-MV, 6-kA, 50-ns annular proton beam has been generated in a full-cusp-geometry diode and transported along a 0.6-T solenoidal magnetic field. The radial profile and transport efficiency were measured under different drift tube conditions using carbon activation. Faraday cup arrays gave time-resolved measurements of the net and ion current densities. The measurements showed that successful transport can be achieved by using a fast puff valve to fill the drift region immediately downstream of the full cusp with neutral gas. The exact neutralization process is still being studied, but it is thought that the plasma created from the neutral gas allows electrons to be pulled from the drift tube walls, neutralizing the space charge of the ion beam. Results have demonstrated beam transport efficiencies of 99% and maintenance of the annular beam profile throughout the drift region. The results have implications for the development of multistage induction accelerators.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134518508","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 : 1989-05-22DOI: 10.1109/PLASMA.1989.166195
E. Chauchard, C. C. Kung, C. H. Lee, M. Rhee
The authors report on the high-voltage operation of GaAs switches. The switches used were intrinsic GaAs and Cr:GaAs of bulk devices of millimeter sizes. The range of bias voltage applied was 500 V to 2 kV. The light source was a Q-switched Nd:YAG laser with 10-ns pulse duration. The closing and opening speeds of the Cr:GaAs switches were limited by the risetime and falltime of the laser pulse. Typical off-resistances when the laser light illumination was turned off were higher than 20 M Omega , whereas the on-resistances with laser illumination can be as low as 1 Omega . Such a large ratio of off-resistance to on-resistance allowed a switching efficiency of better than 99%. In the most practical inductive storage systems, the peak power transferred to the load is restricted by the switch opening time. The voltage multiplication can be achieved by the long duration of the current charging cycle, which in the case of the semiconductor switch is limited by the pulse duration of existing lasers. In order to remedy these two limitations, the authors are developing a laser system capable of delivering a laser pulse of several tens of nanoseconds and a very fast falltime.<>
{"title":"Performance of laser activated semiconductor opening switches","authors":"E. Chauchard, C. C. Kung, C. H. Lee, M. Rhee","doi":"10.1109/PLASMA.1989.166195","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166195","url":null,"abstract":"The authors report on the high-voltage operation of GaAs switches. The switches used were intrinsic GaAs and Cr:GaAs of bulk devices of millimeter sizes. The range of bias voltage applied was 500 V to 2 kV. The light source was a Q-switched Nd:YAG laser with 10-ns pulse duration. The closing and opening speeds of the Cr:GaAs switches were limited by the risetime and falltime of the laser pulse. Typical off-resistances when the laser light illumination was turned off were higher than 20 M Omega , whereas the on-resistances with laser illumination can be as low as 1 Omega . Such a large ratio of off-resistance to on-resistance allowed a switching efficiency of better than 99%. In the most practical inductive storage systems, the peak power transferred to the load is restricted by the switch opening time. The voltage multiplication can be achieved by the long duration of the current charging cycle, which in the case of the semiconductor switch is limited by the pulse duration of existing lasers. In order to remedy these two limitations, the authors are developing a laser system capable of delivering a laser pulse of several tens of nanoseconds and a very fast falltime.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132546651","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 : 1989-05-22DOI: 10.1109/PLASMA.1989.166079
M. Haworth, D. Smith, M. Mazarakis, J. Poukey, D. E. Hasti, L. Bennett, S. Lucero
Temporally and spatially resolved beam electron current density measurements at the anode foil of the Recirculating Linear Accelerator (RLA) 1.5-MV, 15-kA isolated-Blumlein injector have been made using a beam aperture technique. This method derives the beam current density radial profile from the magnitude of the beam current exiting from a range-thick aperture of varying radius centered on the beam axis and placed in contact with the downstream side of the planar anode foil. Successful application of this diagnostic requires axisymmetric beams having good shot-to-shot reproducibility. Experimental and simulation results have been compared.<>
{"title":"Time-resolved diode current density measurements for the Recirculating Linac injector","authors":"M. Haworth, D. Smith, M. Mazarakis, J. Poukey, D. E. Hasti, L. Bennett, S. Lucero","doi":"10.1109/PLASMA.1989.166079","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166079","url":null,"abstract":"Temporally and spatially resolved beam electron current density measurements at the anode foil of the Recirculating Linear Accelerator (RLA) 1.5-MV, 15-kA isolated-Blumlein injector have been made using a beam aperture technique. This method derives the beam current density radial profile from the magnitude of the beam current exiting from a range-thick aperture of varying radius centered on the beam axis and placed in contact with the downstream side of the planar anode foil. Successful application of this diagnostic requires axisymmetric beams having good shot-to-shot reproducibility. Experimental and simulation results have been compared.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133801821","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 : 1989-05-22DOI: 10.1109/PLASMA.1989.166131
F. Begay, I. Lindemuth
Summary form only. Results have been obtained from the two-dimensional, two-temperature computer code MHRDR (Magneto-Hydro-Radiative-Dynamics Research), which describes the performance of the University of Maryland dense plasma focus device. These calculations represent the first analysis of a helium plasma produced in such a device. A comparative analysis of the data from the model and the experiment has been made.<>
{"title":"2-D magnetohydrodynamic model for a dense helium plasma focus","authors":"F. Begay, I. Lindemuth","doi":"10.1109/PLASMA.1989.166131","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166131","url":null,"abstract":"Summary form only. Results have been obtained from the two-dimensional, two-temperature computer code MHRDR (Magneto-Hydro-Radiative-Dynamics Research), which describes the performance of the University of Maryland dense plasma focus device. These calculations represent the first analysis of a helium plasma produced in such a device. A comparative analysis of the data from the model and the experiment has been made.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133256213","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 : 1989-05-22DOI: 10.1109/PLASMA.1989.166172
Y. Wen, D. Brouchous, M. Ichimura, R. Breun, N. Hershkowitz, P. Probert, R. Majeski, T. Intrator, D. Roberts, D. Keil
Experiments with and without ion cyclotron resonance (1.275 MHz, fundamental ion cyclotron frequency of hydrogen plasma) as the thermal-barrier region have been carried out by varying the thermal-barrier magnetic field strength. Radial density profiles, potential profiles, and currents have been measured, as well as the fueling at the thermal-barrier region. The density at the plasma edge increased and the potential at the plasma edge decreased as the B field was decreased to bring the resonance into the thermal-barrier cell in both a balanced and imbalanced gas-puffing case. The data indicated that a possible mechanism is that ions can escape from the confinement region along the open resonance surface (the same as the mod-B surfaces) because the turning point of the trapped ions has a tendency to center on mod-B surfaces. An increasing potential observed in the present experiments in the edge region of the plasma with increasing B field may be related to the higher degree of fluctuation of radial current to the collector.<>
{"title":"Radial ion diffusion induced by cyclotron resonance heating at the thermal barrier region in the Phaedrus-B tandem mirror","authors":"Y. Wen, D. Brouchous, M. Ichimura, R. Breun, N. Hershkowitz, P. Probert, R. Majeski, T. Intrator, D. Roberts, D. Keil","doi":"10.1109/PLASMA.1989.166172","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166172","url":null,"abstract":"Experiments with and without ion cyclotron resonance (1.275 MHz, fundamental ion cyclotron frequency of hydrogen plasma) as the thermal-barrier region have been carried out by varying the thermal-barrier magnetic field strength. Radial density profiles, potential profiles, and currents have been measured, as well as the fueling at the thermal-barrier region. The density at the plasma edge increased and the potential at the plasma edge decreased as the B field was decreased to bring the resonance into the thermal-barrier cell in both a balanced and imbalanced gas-puffing case. The data indicated that a possible mechanism is that ions can escape from the confinement region along the open resonance surface (the same as the mod-B surfaces) because the turning point of the trapped ions has a tendency to center on mod-B surfaces. An increasing potential observed in the present experiments in the edge region of the plasma with increasing B field may be related to the higher degree of fluctuation of radial current to the collector.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133911534","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 : 1989-05-22DOI: 10.1109/PLASMA.1989.166082
W. A. Noonan, S. Glidden, J. Greenly, D. Hammer, K. Jain, N. Qi, L. Brissette
A magnetically insulated ion diode with a plasma anode has been operated on a pulsed power system capable of up to 1-kHz repetition rate in bursts of a few pulses. The authors discuss results on diode operating characteristics as a function of anode plasma parameters and insulating magnetic field strength and results on ion beam extraction in single-shot mode. The plasma anode ion source originates as an annular puff of H/sub 2/, C/sub 2/H/sub 2/, or other gas, which is preionized and then inductively broken down by a 1- mu s-risetime magnetic field coil. The plasma is then magnetically driven toward a magnetically insulated high voltage gap. Ion diode operation depends critically on the gas puff pressure and the relative timing between initiation of the main plasma driver pulse and the arrival of the high-voltage pulse at the ion diode. Single-shot and high-repetition-rate results have been compared, and the dependence of diode operation on other diode conditions (e.g. gas puff pressure and magnetic insulation field strength) has been investigated. Anode plasma temperature and density have been measured in hydrogen plasmas using spectroscopic techniques.<>
{"title":"Operation of an intense ion beam diode at high repetition rate","authors":"W. A. Noonan, S. Glidden, J. Greenly, D. Hammer, K. Jain, N. Qi, L. Brissette","doi":"10.1109/PLASMA.1989.166082","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166082","url":null,"abstract":"A magnetically insulated ion diode with a plasma anode has been operated on a pulsed power system capable of up to 1-kHz repetition rate in bursts of a few pulses. The authors discuss results on diode operating characteristics as a function of anode plasma parameters and insulating magnetic field strength and results on ion beam extraction in single-shot mode. The plasma anode ion source originates as an annular puff of H/sub 2/, C/sub 2/H/sub 2/, or other gas, which is preionized and then inductively broken down by a 1- mu s-risetime magnetic field coil. The plasma is then magnetically driven toward a magnetically insulated high voltage gap. Ion diode operation depends critically on the gas puff pressure and the relative timing between initiation of the main plasma driver pulse and the arrival of the high-voltage pulse at the ion diode. Single-shot and high-repetition-rate results have been compared, and the dependence of diode operation on other diode conditions (e.g. gas puff pressure and magnetic insulation field strength) has been investigated. Anode plasma temperature and density have been measured in hydrogen plasmas using spectroscopic techniques.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133253229","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 : 1989-05-22DOI: 10.1109/PLASMA.1989.166221
N. Rostoker, M. Strauss
A relativistic electron beam propagating through planar or axial channels in a crystal can populate bound transverse energy eigenstates. Spontaneous dipole transitions between these discrete eigenstates lead to narrow-width, highly polarized X-rays that are strongly forward peaked in intensity. To obtain an observable gain from induced emission, the electron beam current density must be 10/sup 7/-10/sup 8/ A/cm/sup 2/ for one-pass amplification. The authors discuss several ways to reduce this current density requirement. The net result of the analysis is that observable gain should be possible for an electron beam current density of 10/sup 4/-10/sup 5/ A/cm/sup 2/. To achieve such a current density, consider a field emission electron gun similar to that used for scanning electron microscopy. The authors have also studied several methods of accelerating the beam and increasing the current without increasing the transverse energy of the beam by using a pulsed source.<>
{"title":"X-ray laser based on channel radiation","authors":"N. Rostoker, M. Strauss","doi":"10.1109/PLASMA.1989.166221","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166221","url":null,"abstract":"A relativistic electron beam propagating through planar or axial channels in a crystal can populate bound transverse energy eigenstates. Spontaneous dipole transitions between these discrete eigenstates lead to narrow-width, highly polarized X-rays that are strongly forward peaked in intensity. To obtain an observable gain from induced emission, the electron beam current density must be 10/sup 7/-10/sup 8/ A/cm/sup 2/ for one-pass amplification. The authors discuss several ways to reduce this current density requirement. The net result of the analysis is that observable gain should be possible for an electron beam current density of 10/sup 4/-10/sup 5/ A/cm/sup 2/. To achieve such a current density, consider a field emission electron gun similar to that used for scanning electron microscopy. The authors have also studied several methods of accelerating the beam and increasing the current without increasing the transverse energy of the beam by using a pulsed source.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"33 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132795750","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 : 1989-05-22DOI: 10.1109/PLASMA.1989.166043
A. Dunning, J. Greenly, G. Rondeau
A magnetically insulated extraction-geometry ion diode using inductive breakdown of a gas layer to produce a magnetically confined anode plasma has been successfully operated on the LONGSHOT pulser. The pulse parameters were 120 kV, 30 kA, and 500 ns, and improved on all other characteristics except beam divergence. The plasma anode has now been integrated into a similar diode to operate on the Neptune pulser, to produce pulses of 700 kV, 3 Omega , 100 ns, and >0.1 TW. The goal is to investigate the scaling of this diode to the higher voltage and to current density above 0.5 kA/cm/sup 2/. The major scaling issue is whether good control of the anode surface shape and position, and the resulting ion canonical momentum and divergence, can be maintained. The beam from this diode will be used to form diamagnetic ion rings, and will allow good diagnosis of beam quality.<>
{"title":"A 0.1 TW gas-breakdown plasma-anode ion diode","authors":"A. Dunning, J. Greenly, G. Rondeau","doi":"10.1109/PLASMA.1989.166043","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166043","url":null,"abstract":"A magnetically insulated extraction-geometry ion diode using inductive breakdown of a gas layer to produce a magnetically confined anode plasma has been successfully operated on the LONGSHOT pulser. The pulse parameters were 120 kV, 30 kA, and <or approximately=1 mu s duration. LONGSHOT produced double the total ion output compared to a standard dielectric anode, allowed constant impedance for >500 ns, and improved on all other characteristics except beam divergence. The plasma anode has now been integrated into a similar diode to operate on the Neptune pulser, to produce pulses of 700 kV, 3 Omega , 100 ns, and >0.1 TW. The goal is to investigate the scaling of this diode to the higher voltage and to current density above 0.5 kA/cm/sup 2/. The major scaling issue is whether good control of the anode surface shape and position, and the resulting ion canonical momentum and divergence, can be maintained. The beam from this diode will be used to form diamagnetic ion rings, and will allow good diagnosis of beam quality.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132780582","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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