Pub Date : 1994-06-06DOI: 10.1109/PLASMA.1994.589049
J. Boeuf, L. Pitchford
A stationary plasma thruster (SPT) is an electromagnetic thruster design which has been developed primarily in the Former Soviet Union and which has properties which make it especially suitable for applications such as satellite station-keeping. The device geometry is cylindrical with a central dielectric rod and dielectric walls. A voltage (a few 100 V) is maintained between the anode (at one end of the cylinder) and the cathode (usually a hollow cathode or a filament slightly past the other end of the cylinder), and the current flowing through the device is on the order of several amps. Gas (usually xenon) flows in from the anode and is ionized by the electrons which are emitted from the cathode. An external magnetic field is applied primarily in the radial direction with a magnetic strength such that the electron gyroradius is much less than the device dimension but that the ion gyroradius is larger than the device dimensions. The SPT is a particular type of closed-drift thruster where ions are electrostatically accelerated in the thrust direction, with the accelerating electric field established by an electron current interacting with a transverse magnetic field. In such a configuration, an ion flux is produced with amore » high efficiency. The authors have developed a two-dimensional model for the purpose of elucidating the physical phenomena controlling the device performance and eventually developing scaling laws to guide the optimization of SPT`s. The model consists of fluid equations for the electrons and ions coupled to Poisson`s equation for the self-consistent electric field. The description of ion transport can be improved if necessary by solving the Vlasov equation with a particle method. Electron diffusion across the magnetic field is an important aspect of closed-drift thruster operation.« less
{"title":"Two-dimensional Model Of Stationary Plasma Thruster","authors":"J. Boeuf, L. Pitchford","doi":"10.1109/PLASMA.1994.589049","DOIUrl":"https://doi.org/10.1109/PLASMA.1994.589049","url":null,"abstract":"A stationary plasma thruster (SPT) is an electromagnetic thruster design which has been developed primarily in the Former Soviet Union and which has properties which make it especially suitable for applications such as satellite station-keeping. The device geometry is cylindrical with a central dielectric rod and dielectric walls. A voltage (a few 100 V) is maintained between the anode (at one end of the cylinder) and the cathode (usually a hollow cathode or a filament slightly past the other end of the cylinder), and the current flowing through the device is on the order of several amps. Gas (usually xenon) flows in from the anode and is ionized by the electrons which are emitted from the cathode. An external magnetic field is applied primarily in the radial direction with a magnetic strength such that the electron gyroradius is much less than the device dimension but that the ion gyroradius is larger than the device dimensions. The SPT is a particular type of closed-drift thruster where ions are electrostatically accelerated in the thrust direction, with the accelerating electric field established by an electron current interacting with a transverse magnetic field. In such a configuration, an ion flux is produced with amore » high efficiency. The authors have developed a two-dimensional model for the purpose of elucidating the physical phenomena controlling the device performance and eventually developing scaling laws to guide the optimization of SPT`s. The model consists of fluid equations for the electrons and ions coupled to Poisson`s equation for the self-consistent electric field. The description of ion transport can be improved if necessary by solving the Vlasov equation with a particle method. Electron diffusion across the magnetic field is an important aspect of closed-drift thruster operation.« less","PeriodicalId":254741,"journal":{"name":"Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127350330","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 : 1994-06-06DOI: 10.1109/PLASMA.1994.589026
J. Galambos, M. Bohnet, T. Jarboe, A. T. Mattick
Development of Transient Internal Probe (TIP) Magnetic Field Diagnostic. J.P. Galambos, MA. Bohnet, T.R. Jarboe, A.T. Mattick, t h d j $ %&+ The Transient Internal Probe (TIP) is designed to permit measurement of internal magnetic fields in hot, high density plasmas. The concept consists of accelerating a probe to high velocities (2.2 Km/s) in order to minimize probe exposure time to plasma. Faraday rotation within the probe is used to measure the local magnetic field. An Argon laser illuminates the probe consisting of a Faraday-rotator material with a retro-reflector that r e m s the incident light to the detection system. Performance results of the light gas gun and optical detection system will shown. To date, the gas gun has been extensively tested consistently achieving velocities between 2 and 3 Ms. The probe and detection scheme have been tested by dropping the probe through a static magnetic field. Magnetic field resolution of 20 gauss and spatial resolution of 5 mm has been achieved. System frequency response is 10Mhz. Work is currently being conducted to integrate the diagnostic system with laboratory plasma experiments. Specifically a gas interfaced system has been developed to prevent helium muzzle gas from entering the plasma chamber with the probe. Additionally the probe must be separated from the sabot which protects the probe during acceleration in the gas gun. Data will be presented showing the results of various separation techniques. Results of pressure measurements illustrating the effectiveness of the gas interface system will also be presented. The diagnostic is scheduled to make measurements on the Helicity Injected Toms (HIT) at the University of Washington. 4P29
{"title":"Development Of Transient Internal Probe (tip) Magnetic Field Diagnostic","authors":"J. Galambos, M. Bohnet, T. Jarboe, A. T. Mattick","doi":"10.1109/PLASMA.1994.589026","DOIUrl":"https://doi.org/10.1109/PLASMA.1994.589026","url":null,"abstract":"Development of Transient Internal Probe (TIP) Magnetic Field Diagnostic. J.P. Galambos, MA. Bohnet, T.R. Jarboe, A.T. Mattick, t h d j $ %&+ The Transient Internal Probe (TIP) is designed to permit measurement of internal magnetic fields in hot, high density plasmas. The concept consists of accelerating a probe to high velocities (2.2 Km/s) in order to minimize probe exposure time to plasma. Faraday rotation within the probe is used to measure the local magnetic field. An Argon laser illuminates the probe consisting of a Faraday-rotator material with a retro-reflector that r e m s the incident light to the detection system. Performance results of the light gas gun and optical detection system will shown. To date, the gas gun has been extensively tested consistently achieving velocities between 2 and 3 Ms. The probe and detection scheme have been tested by dropping the probe through a static magnetic field. Magnetic field resolution of 20 gauss and spatial resolution of 5 mm has been achieved. System frequency response is 10Mhz. Work is currently being conducted to integrate the diagnostic system with laboratory plasma experiments. Specifically a gas interfaced system has been developed to prevent helium muzzle gas from entering the plasma chamber with the probe. Additionally the probe must be separated from the sabot which protects the probe during acceleration in the gas gun. Data will be presented showing the results of various separation techniques. Results of pressure measurements illustrating the effectiveness of the gas interface system will also be presented. The diagnostic is scheduled to make measurements on the Helicity Injected Toms (HIT) at the University of Washington. 4P29","PeriodicalId":254741,"journal":{"name":"Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130684648","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 : 1994-06-06DOI: 10.1109/PLASMA.1994.589050
V. Godyak, V.P. Meytlis, H. Strauss
{"title":"Non-maxwellian Bounded Piasma Model Charge Exchange Ion Collisions","authors":"V. Godyak, V.P. Meytlis, H. Strauss","doi":"10.1109/PLASMA.1994.589050","DOIUrl":"https://doi.org/10.1109/PLASMA.1994.589050","url":null,"abstract":"","PeriodicalId":254741,"journal":{"name":"Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS)","volume":"244 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132086292","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 : 1994-06-06DOI: 10.1109/PLASMA.1994.589011
S. Dudin, A. Zykov, A. Ushakov
Experimental results of investigations of electron dynamics in anode layer of Hall type ion source ``Radical`` are presented. The ion source consists of plate parallel cathode and anode separated by 4.5mm space. There is ring-like gap in cathode. Inner and outer parts of cathode are the poles of magnetic circuit which produces lateral magnetic field H = 0.7 {divided_by} 2 kE. Anode voltage U{sub a} was 0.6 {divided_by} 2 kV, pressure in discharge space was about 10{sup {minus}3} Tor. Glow cathode which might be moved in axial direction was used to investigate electron dynamics. Study of emission current distribution between the electrodes by additional electron injection had shown that only electrons from anode-cathode spacing are able to reach the anode. Dependence of emission current vs. distance between anode and emitter Z correlates with plasma potential distribution. The phenomenon of electron escape to cathode is interesting because even applying of cut-off bias at the emitter does not lead to vanishing of electron current. In addition, electron currents (about 10% of anode current) on cathode exists without external injection of electrons. There is considerable asymmetry of current distribution between inner and outer parts of the cathode. Energoanalysis of the escaping electrons hadmore » shown that electron loss was due to population through high energy tail of distribution function, which appeared as a result of electron-electron collisions.« less
{"title":"Dynamics Of Electrons In Anode Layer Of Hall-type Ion Source","authors":"S. Dudin, A. Zykov, A. Ushakov","doi":"10.1109/PLASMA.1994.589011","DOIUrl":"https://doi.org/10.1109/PLASMA.1994.589011","url":null,"abstract":"Experimental results of investigations of electron dynamics in anode layer of Hall type ion source ``Radical`` are presented. The ion source consists of plate parallel cathode and anode separated by 4.5mm space. There is ring-like gap in cathode. Inner and outer parts of cathode are the poles of magnetic circuit which produces lateral magnetic field H = 0.7 {divided_by} 2 kE. Anode voltage U{sub a} was 0.6 {divided_by} 2 kV, pressure in discharge space was about 10{sup {minus}3} Tor. Glow cathode which might be moved in axial direction was used to investigate electron dynamics. Study of emission current distribution between the electrodes by additional electron injection had shown that only electrons from anode-cathode spacing are able to reach the anode. Dependence of emission current vs. distance between anode and emitter Z correlates with plasma potential distribution. The phenomenon of electron escape to cathode is interesting because even applying of cut-off bias at the emitter does not lead to vanishing of electron current. In addition, electron currents (about 10% of anode current) on cathode exists without external injection of electrons. There is considerable asymmetry of current distribution between inner and outer parts of the cathode. Energoanalysis of the escaping electrons hadmore » shown that electron loss was due to population through high energy tail of distribution function, which appeared as a result of electron-electron collisions.« less","PeriodicalId":254741,"journal":{"name":"Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132137655","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 : 1994-06-06DOI: 10.1109/PLASMA.1994.588996
M. Bourham, J. Gilligan, C. Edwards, M. Nahm
{"title":"Surface Erosion Studies In A Plasmapropellant Interaction Experiment","authors":"M. Bourham, J. Gilligan, C. Edwards, M. Nahm","doi":"10.1109/PLASMA.1994.588996","DOIUrl":"https://doi.org/10.1109/PLASMA.1994.588996","url":null,"abstract":"","PeriodicalId":254741,"journal":{"name":"Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132279616","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 : 1994-06-06DOI: 10.1109/PLASMA.1994.588868
R. Prasad, M. Krishnan, K. Berg, D. Conlon, J. Mangano
{"title":"Neon Dense Plasma Focus Point X-ray Source For /spl les/ 0.25 /spl mu/m lithography","authors":"R. Prasad, M. Krishnan, K. Berg, D. Conlon, J. Mangano","doi":"10.1109/PLASMA.1994.588868","DOIUrl":"https://doi.org/10.1109/PLASMA.1994.588868","url":null,"abstract":"","PeriodicalId":254741,"journal":{"name":"Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129249068","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 : 1994-06-06DOI: 10.1109/PLASMA.1994.588964
B. Etlicher, A. Chuvatin, P. Zehnter, N. Edison, M. Darrigol, D. Friart, C. Nazet, P. Choi, C. Zoita, R. Baksht, I. Datsko, A. Fedunin, A. Shishlov, A. Kim, V. Kokshenev, B. Kovalchuk, A. Russkich, A. Shishlov, M.O. Kosheroi, D. A. Fedin
In this paper, the authors will emphasize the coupling between a megajoule inductive storage generator with a multi-stage plasma on wire pinch. In this configuration, they used different puff on puff gas injection on a on-axis metallic wire. The wire was chosen to check the plasma conditions which, in a collisional regime, will give an efficient X-ray laser from Ne-like Ti. Results of a first series of shots done to understand the dynamic of the system will be given. The x-ray recorded by a 10 channels PIN diode array working between 2 and 10 keV shows a rise time less then 2 ns and an important hard x-ray (> 15 keV) component from the dense plasma core was measured at maximum compression time. Enhanced stability of the scheme will be shown.
{"title":"A Multi Stage Plasma-on-wire Z-pinch Configuration On The Megajoule Git-4 Generato","authors":"B. Etlicher, A. Chuvatin, P. Zehnter, N. Edison, M. Darrigol, D. Friart, C. Nazet, P. Choi, C. Zoita, R. Baksht, I. Datsko, A. Fedunin, A. Shishlov, A. Kim, V. Kokshenev, B. Kovalchuk, A. Russkich, A. Shishlov, M.O. Kosheroi, D. A. Fedin","doi":"10.1109/PLASMA.1994.588964","DOIUrl":"https://doi.org/10.1109/PLASMA.1994.588964","url":null,"abstract":"In this paper, the authors will emphasize the coupling between a megajoule inductive storage generator with a multi-stage plasma on wire pinch. In this configuration, they used different puff on puff gas injection on a on-axis metallic wire. The wire was chosen to check the plasma conditions which, in a collisional regime, will give an efficient X-ray laser from Ne-like Ti. Results of a first series of shots done to understand the dynamic of the system will be given. The x-ray recorded by a 10 channels PIN diode array working between 2 and 10 keV shows a rise time less then 2 ns and an important hard x-ray (> 15 keV) component from the dense plasma core was measured at maximum compression time. Enhanced stability of the scheme will be shown.","PeriodicalId":254741,"journal":{"name":"Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS)","volume":"610 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123337619","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 : 1994-06-06DOI: 10.1109/PLASMA.1994.589018
J. EddIeman, C. Hartman, U. Shumlak
The authors report on 2 and 3-D MHD calculations of the focus and flow-through Z-pinch using TRAC2 and TRAC3 codes and stability calculations using a 3-D, linearized stability code. The effects of rotation can be studied with all the codes. Axisymmetric perturbations in the current sheath velocity at the beginning of pinching in the focus are calculated in TRAC2 to wash out suggesting stabilization against sausage-like modes because of axial flow during pinching. Rotation of a sharp profile stationary Z-pinch is found to reduce the growth rate of the kink instability. Further studies of the stability of rotating, diffuse-profile pinches will be reported. 2-D calculations have established subAlfvenic, diffuse profile flow states which will be analyzed for stability. It is important to have subAlfvenic flow speeds to achieve a high Q fusion reactor system.
作者报告了使用TRAC2和TRAC3代码对焦点和Z-pinch流动进行2 - 3d MHD计算，并使用3-D线性化稳定性代码进行稳定性计算。旋转的影响可以用所有的代码来研究。在TRAC2中计算了焦点夹紧开始时当前鞘层速度的轴对称扰动，表明由于夹紧期间的轴向流动，对香肠样模式的稳定。发现锋利轮廓的旋转固定z夹紧可以降低扭结不稳定性的增长速度。进一步研究旋转的稳定性，扩散-轮廓缩紧将被报道。二维计算已经建立了亚阿尔芬流态，将对其稳定性进行分析。为了实现高Q的聚变反应堆系统，具有亚阿尔芬流速度是很重要的。
{"title":"2 and 3-D MHD Calculations Of the plasma Focus and Flow-through Z-pinch","authors":"J. EddIeman, C. Hartman, U. Shumlak","doi":"10.1109/PLASMA.1994.589018","DOIUrl":"https://doi.org/10.1109/PLASMA.1994.589018","url":null,"abstract":"The authors report on 2 and 3-D MHD calculations of the focus and flow-through Z-pinch using TRAC2 and TRAC3 codes and stability calculations using a 3-D, linearized stability code. The effects of rotation can be studied with all the codes. Axisymmetric perturbations in the current sheath velocity at the beginning of pinching in the focus are calculated in TRAC2 to wash out suggesting stabilization against sausage-like modes because of axial flow during pinching. Rotation of a sharp profile stationary Z-pinch is found to reduce the growth rate of the kink instability. Further studies of the stability of rotating, diffuse-profile pinches will be reported. 2-D calculations have established subAlfvenic, diffuse profile flow states which will be analyzed for stability. It is important to have subAlfvenic flow speeds to achieve a high Q fusion reactor system.","PeriodicalId":254741,"journal":{"name":"Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122951058","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 : 1994-06-06DOI: 10.1109/PLASMA.1994.588988
T. Sanford, J. Halbleib, D. Welch, R. Mock
A unique beam of pulsed electrons has been developed using the 19-MeV, 700-kA Hermes-III accelerator. The extended planar-anode diode is used to extract at large radius an annular electron beam from the accelerator and inject the resulting beam at small angle into a low-pressure gas cell, where the beam is rapidly charge neutralized and almost current neutralized. Under these conditions, the beam propagates nearly ballistically to a focus downstream of injection, where objects can be placed for irradiation and study. For a focal length of 78 cm, measurements with a segmented calorimeter show that this configuration can deliver an energy deposition of 200 J/g [20 Mrad] over a useful area of 70 cm{sup 2} and a 4-cm depth in graphite in 25 ns. Increasing the injection angle by reducing the AK gap permits higher doses over smaller areas to be achieved. Such beams are of interest for the study of material property changes from short-pulse high-energy depositions and for the study of electronic components response to thermal mechanical shock. The MAGIC/CYLTRAN model prediction of the radial energy deposition profile in the calorimeter is in excellent agreement with that measured at the focus. This experimentally verified model predicts that a peakmore » dose of 3,800 J/g (too high to be easily measured) with a HWHM radius of 1.3 cm can be generated at the focus in graphite if the focal length is decreased to 11 cm.« less
{"title":"Dynamicsofa Very Intense Pulsed electron Beam","authors":"T. Sanford, J. Halbleib, D. Welch, R. Mock","doi":"10.1109/PLASMA.1994.588988","DOIUrl":"https://doi.org/10.1109/PLASMA.1994.588988","url":null,"abstract":"A unique beam of pulsed electrons has been developed using the 19-MeV, 700-kA Hermes-III accelerator. The extended planar-anode diode is used to extract at large radius an annular electron beam from the accelerator and inject the resulting beam at small angle into a low-pressure gas cell, where the beam is rapidly charge neutralized and almost current neutralized. Under these conditions, the beam propagates nearly ballistically to a focus downstream of injection, where objects can be placed for irradiation and study. For a focal length of 78 cm, measurements with a segmented calorimeter show that this configuration can deliver an energy deposition of 200 J/g [20 Mrad] over a useful area of 70 cm{sup 2} and a 4-cm depth in graphite in 25 ns. Increasing the injection angle by reducing the AK gap permits higher doses over smaller areas to be achieved. Such beams are of interest for the study of material property changes from short-pulse high-energy depositions and for the study of electronic components response to thermal mechanical shock. The MAGIC/CYLTRAN model prediction of the radial energy deposition profile in the calorimeter is in excellent agreement with that measured at the focus. This experimentally verified model predicts that a peakmore » dose of 3,800 J/g (too high to be easily measured) with a HWHM radius of 1.3 cm can be generated at the focus in graphite if the focal length is decreased to 11 cm.« less","PeriodicalId":254741,"journal":{"name":"Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126570172","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 : 1994-06-06DOI: 10.1109/PLASMA.1994.588968
C. Deeney, P.D. LePeIl, B. FaiIor, S. Wong, E. Yadlowski, B. Hazelton, J. Apruzese, K. Whitney, J. Thornhill, T. Nash
The authors have imploded aluminum wire arrays which were coated with magnesium on the 4 MA Double-EAGLE generator. The mass fraction of the magnesium varied from 0 to 70%. All the arrays were 15 mm in diameter, 2 cm long and, due to current and mass variations, the implosion times ranged from 85 t 95 ns. The aims were two-fold: (1) to investigate yield enhancement due to the mixing of near Z elements; and (2) to study what parts of the initial wire form the bulk of the on-axis pinch. The results they will present show an average increase in yield of 70% over pure aluminum arrays and 30 to 40% over pinches that were predominantly magnesium. This may be due to an effect discussed by J.P. Apruzese et al for Na-Ne near Z mixtures in which the decrease in the opacities of individual lines increased the escape probabilities. Furthermore, the data shows that by a 70:30 A1:Mg mix, the bulk of the radiation comes from the magnesium indicating that the outside of the wires preferentially dominate the heated core of the pinch. This is confirmed by the fact that the magnesium temperature is hotter than the aluminum. They willmore » present this data along with one-dimensional radiation-hydrodynamic and CRE modeling of these pinches.« less
{"title":"Implosion Of Aluminum Wire Arrays Coated With Magnesium On The 4 Ma Double-eagle Generator","authors":"C. Deeney, P.D. LePeIl, B. FaiIor, S. Wong, E. Yadlowski, B. Hazelton, J. Apruzese, K. Whitney, J. Thornhill, T. Nash","doi":"10.1109/PLASMA.1994.588968","DOIUrl":"https://doi.org/10.1109/PLASMA.1994.588968","url":null,"abstract":"The authors have imploded aluminum wire arrays which were coated with magnesium on the 4 MA Double-EAGLE generator. The mass fraction of the magnesium varied from 0 to 70%. All the arrays were 15 mm in diameter, 2 cm long and, due to current and mass variations, the implosion times ranged from 85 t 95 ns. The aims were two-fold: (1) to investigate yield enhancement due to the mixing of near Z elements; and (2) to study what parts of the initial wire form the bulk of the on-axis pinch. The results they will present show an average increase in yield of 70% over pure aluminum arrays and 30 to 40% over pinches that were predominantly magnesium. This may be due to an effect discussed by J.P. Apruzese et al for Na-Ne near Z mixtures in which the decrease in the opacities of individual lines increased the escape probabilities. Furthermore, the data shows that by a 70:30 A1:Mg mix, the bulk of the radiation comes from the magnesium indicating that the outside of the wires preferentially dominate the heated core of the pinch. This is confirmed by the fact that the magnesium temperature is hotter than the aluminum. They willmore » present this data along with one-dimensional radiation-hydrodynamic and CRE modeling of these pinches.« less","PeriodicalId":254741,"journal":{"name":"Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126081588","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：