The Experts below are selected from a list of 10857 Experts worldwide ranked by ideXlab platform
S C Bott - One of the best experts on this subject based on the ideXlab platform.
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modifying wire array z pinch ablation structure and implosion dynamics using coiled wires
IEEE Transactions on Plasma Science, 2009Co-Authors: G Hall, S V Lebedev, S N Bland, J P Chittenden, F Suzukividal, Adam Harveythompson, G F Swadling, J B A Palmer, N Niasse, S C BottAbstract:Coiled arrays, which are cylindrical arrays in which each wire is formed into a helix, suppress the modulation of ablation at the fundamental wavelength. Outside the vicinity of the wire cores, ablation flow from coiled arrays is modulated at the coil wavelength and has a two-stream structure in the r, thetas plane. Within the vicinity of the helical wires, ablation is concentrated at positions with the greatest azimuthal displacement, and plasma is Axially transported from these positions such that the streams become aligned with the sections of the coil furthest from the array axis. The GORGON MHD code accurately reproduces this observed ablation structure, which can be understood in terms of J times B forces that result from the interaction of the global magnetic field with a helical current path as well as additional current paths suggested by the simulations. With this ability to control where the ablation streamers occur, large wavelength coils were constructed such that the breaks that form in the wires had sufficient Axial Separation to prevent perturbations in the implosion sheath from merging. This produced a new mode of implosion in which the global instability can be controlled, and perturbations correlated between all wires in an array. For large-wavelength eight-wire coiled arrays, this produced a dramatic increase in X-ray power, equaling that of a 32-wire straight array. These experiments were carried out on the mega ampere generator for plasma implosion experiments (1 MA, 240 ns) at Imperial College London, London, U.K.
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modifying wire array z pinch ablation structure and implosion dynamics using coiled arrays
International Conference on Plasma Science, 2008Co-Authors: G N Hall, S V Lebedev, S N Bland, J P Chittenden, F Suzukividal, J B A Palmer, S C BottAbstract:Coiled arrays, a cylindrical array in which each wire is formed into a helix, suppress the modulation of ablation at the fundamental wavelength. Outside the vicinity of the wire cores, ablation flow from coiled arrays is modulated at the coil wavelength and has a 2-stream structure in the r,thetas plane. Within the vicinity of the helical wires, ablation is concentrated at positions with the greatest azimuthal displacement and plasma is Axially transported from these positions such that the streams become aligned with sections of the coil furthest from the array axis. The GORGON MHD code accurately reproduces this observed ablation structure, which can be understood in terms of Axial JxB forces that result from the interaction of the global magnetic field with radial components of a helical current path as well as additional current paths suggested by the simulations. With this ability to control where ablation streamers occur, large wavelength coils were constructed such that the breaks that form in the wires had sufficient Axial Separation to prevent perturbations in the implosion sheath from merging. This produces a new, organised mode of implosion in which the global instability can be controlled and the perturbations correlated between all the wires in the array. For large wavelength 8-wire coiled arrays, this produced a dramatic increase in x-ray power, equaling the x-ray power of a 32-wire straight array. These experiments were carried out on the MAGPIE generator (IMA, 240ns) at Imperial College, London.
K M Golant - One of the best experts on this subject based on the ideXlab platform.
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erratum Separation of germanium and silicon oxides by plasma chemical deposition of germanosilicate glass in a moving plasma column tech phys lett 25 530 532 1999
Technical Physics Letters, 1999Co-Authors: K M Golant, I V NikolinAbstract:The optical transmission spectrum of germanosilicate glass deposited by surface plasma chemical vapor deposition on the inner surface of a quartz tube revealed interference resonances typical of multilayer dielectric coationgs with alternating refractive indices. It is shown that this effect can be attributed to the longitudinal inhomogeneity of the plasma composition and specifically to an Axial shift of the concentration maxima of germanium and silicon oxide. As a plasma having a nonuniform composition moves along the tube, a layer of glass is formed with a strong transverse germanium concentration gradient. It is established that in surface plasma chemical vapor deposition the Axial Separation of the regions of deposition of the silicon and germanium oxides increases if the glass synthesized under conditions of oxygen deficiency.
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Separation of germanium and silicon oxides by plasma chemical deposition of germanosilicate glass in a moving plasma column
Technical Physics Letters, 1999Co-Authors: K M Golant, I V NikitinAbstract:The optical transmission spectrum of germanosilicate glass deposited by surface plasma chemical vapor deposition on the inner surface of a quartz tube revealed interference resonances typical of multilayer dielectric coatings with alternating refractive indices. It is shown that this effect can be attributed to the longitudinal inhomogeneity of the plasma composition and specifically to an Axial shift of the concentration maxima of germanium and silicon oxide. As a plasma having a nonuniform composition moves along the tube, a layer of glass is formed with a strong transverse germanium concentration gradient. It is established that in surface plasma chemical vapor deposition the Axial Separation of the regions of deposition of the silicon and germanium oxides increases if the glass is synthesized under conditions of oxygen deficiency.
J P Chittenden - One of the best experts on this subject based on the ideXlab platform.
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coiled arrays as a tool for modifying current convergence in a wire array z pinch
International Conference on Plasma Science, 2010Co-Authors: G Hall, S V Lebedev, S N Bland, J P Chittenden, F Suzukividal, Adam Harveythompson, G F Swadling, G Burdiak, L Pickworth, E KhooryAbstract:Coiled arrays, a cylindrical array in which each wire is formed into a single helix, suppress the modulation of ablation at the fundamental wavelength. Instead, ablation flow is modulated at the wavelength of the coil. Large wavelength coils produce wire beaks with sufficient Axial Separation that perturbations in the implosion sheath do not merge, producing an organized mode of implosion in which the global instability can be controlled and the perturbations correlated between all the wires in the array. The inductance of the current paths that may be established by an organized implosion are considered. This suggests that, for a given inductive voltage drop across the load, coiled arrays are capable of achieving significantly higher current convergence to the axis than straight arrays. These experiments were carried out on the MAGPIE generator at Imperial College. This research was sponsored by Sandia National Laboratories Albuquerque, the SSAA program of NNSA under DOE Cooperative Agreement DE-FC03-02NA00057.
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modifying wire array z pinch ablation structure and implosion dynamics using coiled wires
IEEE Transactions on Plasma Science, 2009Co-Authors: G Hall, S V Lebedev, S N Bland, J P Chittenden, F Suzukividal, Adam Harveythompson, G F Swadling, J B A Palmer, N Niasse, S C BottAbstract:Coiled arrays, which are cylindrical arrays in which each wire is formed into a helix, suppress the modulation of ablation at the fundamental wavelength. Outside the vicinity of the wire cores, ablation flow from coiled arrays is modulated at the coil wavelength and has a two-stream structure in the r, thetas plane. Within the vicinity of the helical wires, ablation is concentrated at positions with the greatest azimuthal displacement, and plasma is Axially transported from these positions such that the streams become aligned with the sections of the coil furthest from the array axis. The GORGON MHD code accurately reproduces this observed ablation structure, which can be understood in terms of J times B forces that result from the interaction of the global magnetic field with a helical current path as well as additional current paths suggested by the simulations. With this ability to control where the ablation streamers occur, large wavelength coils were constructed such that the breaks that form in the wires had sufficient Axial Separation to prevent perturbations in the implosion sheath from merging. This produced a new mode of implosion in which the global instability can be controlled, and perturbations correlated between all wires in an array. For large-wavelength eight-wire coiled arrays, this produced a dramatic increase in X-ray power, equaling that of a 32-wire straight array. These experiments were carried out on the mega ampere generator for plasma implosion experiments (1 MA, 240 ns) at Imperial College London, London, U.K.
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modifying wire array z pinch ablation structure and implosion dynamics using coiled arrays
International Conference on Plasma Science, 2008Co-Authors: G N Hall, S V Lebedev, S N Bland, J P Chittenden, F Suzukividal, J B A Palmer, S C BottAbstract:Coiled arrays, a cylindrical array in which each wire is formed into a helix, suppress the modulation of ablation at the fundamental wavelength. Outside the vicinity of the wire cores, ablation flow from coiled arrays is modulated at the coil wavelength and has a 2-stream structure in the r,thetas plane. Within the vicinity of the helical wires, ablation is concentrated at positions with the greatest azimuthal displacement and plasma is Axially transported from these positions such that the streams become aligned with sections of the coil furthest from the array axis. The GORGON MHD code accurately reproduces this observed ablation structure, which can be understood in terms of Axial JxB forces that result from the interaction of the global magnetic field with radial components of a helical current path as well as additional current paths suggested by the simulations. With this ability to control where ablation streamers occur, large wavelength coils were constructed such that the breaks that form in the wires had sufficient Axial Separation to prevent perturbations in the implosion sheath from merging. This produces a new, organised mode of implosion in which the global instability can be controlled and the perturbations correlated between all the wires in the array. For large wavelength 8-wire coiled arrays, this produced a dramatic increase in x-ray power, equaling the x-ray power of a 32-wire straight array. These experiments were carried out on the MAGPIE generator (IMA, 240ns) at Imperial College, London.
S N Bland - One of the best experts on this subject based on the ideXlab platform.
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coiled arrays as a tool for modifying current convergence in a wire array z pinch
International Conference on Plasma Science, 2010Co-Authors: G Hall, S V Lebedev, S N Bland, J P Chittenden, F Suzukividal, Adam Harveythompson, G F Swadling, G Burdiak, L Pickworth, E KhooryAbstract:Coiled arrays, a cylindrical array in which each wire is formed into a single helix, suppress the modulation of ablation at the fundamental wavelength. Instead, ablation flow is modulated at the wavelength of the coil. Large wavelength coils produce wire beaks with sufficient Axial Separation that perturbations in the implosion sheath do not merge, producing an organized mode of implosion in which the global instability can be controlled and the perturbations correlated between all the wires in the array. The inductance of the current paths that may be established by an organized implosion are considered. This suggests that, for a given inductive voltage drop across the load, coiled arrays are capable of achieving significantly higher current convergence to the axis than straight arrays. These experiments were carried out on the MAGPIE generator at Imperial College. This research was sponsored by Sandia National Laboratories Albuquerque, the SSAA program of NNSA under DOE Cooperative Agreement DE-FC03-02NA00057.
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modifying wire array z pinch ablation structure and implosion dynamics using coiled wires
IEEE Transactions on Plasma Science, 2009Co-Authors: G Hall, S V Lebedev, S N Bland, J P Chittenden, F Suzukividal, Adam Harveythompson, G F Swadling, J B A Palmer, N Niasse, S C BottAbstract:Coiled arrays, which are cylindrical arrays in which each wire is formed into a helix, suppress the modulation of ablation at the fundamental wavelength. Outside the vicinity of the wire cores, ablation flow from coiled arrays is modulated at the coil wavelength and has a two-stream structure in the r, thetas plane. Within the vicinity of the helical wires, ablation is concentrated at positions with the greatest azimuthal displacement, and plasma is Axially transported from these positions such that the streams become aligned with the sections of the coil furthest from the array axis. The GORGON MHD code accurately reproduces this observed ablation structure, which can be understood in terms of J times B forces that result from the interaction of the global magnetic field with a helical current path as well as additional current paths suggested by the simulations. With this ability to control where the ablation streamers occur, large wavelength coils were constructed such that the breaks that form in the wires had sufficient Axial Separation to prevent perturbations in the implosion sheath from merging. This produced a new mode of implosion in which the global instability can be controlled, and perturbations correlated between all wires in an array. For large-wavelength eight-wire coiled arrays, this produced a dramatic increase in X-ray power, equaling that of a 32-wire straight array. These experiments were carried out on the mega ampere generator for plasma implosion experiments (1 MA, 240 ns) at Imperial College London, London, U.K.
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modifying wire array z pinch ablation structure and implosion dynamics using coiled arrays
International Conference on Plasma Science, 2008Co-Authors: G N Hall, S V Lebedev, S N Bland, J P Chittenden, F Suzukividal, J B A Palmer, S C BottAbstract:Coiled arrays, a cylindrical array in which each wire is formed into a helix, suppress the modulation of ablation at the fundamental wavelength. Outside the vicinity of the wire cores, ablation flow from coiled arrays is modulated at the coil wavelength and has a 2-stream structure in the r,thetas plane. Within the vicinity of the helical wires, ablation is concentrated at positions with the greatest azimuthal displacement and plasma is Axially transported from these positions such that the streams become aligned with sections of the coil furthest from the array axis. The GORGON MHD code accurately reproduces this observed ablation structure, which can be understood in terms of Axial JxB forces that result from the interaction of the global magnetic field with radial components of a helical current path as well as additional current paths suggested by the simulations. With this ability to control where ablation streamers occur, large wavelength coils were constructed such that the breaks that form in the wires had sufficient Axial Separation to prevent perturbations in the implosion sheath from merging. This produces a new, organised mode of implosion in which the global instability can be controlled and the perturbations correlated between all the wires in the array. For large wavelength 8-wire coiled arrays, this produced a dramatic increase in x-ray power, equaling the x-ray power of a 32-wire straight array. These experiments were carried out on the MAGPIE generator (IMA, 240ns) at Imperial College, London.
F Suzukividal - One of the best experts on this subject based on the ideXlab platform.
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coiled arrays as a tool for modifying current convergence in a wire array z pinch
International Conference on Plasma Science, 2010Co-Authors: G Hall, S V Lebedev, S N Bland, J P Chittenden, F Suzukividal, Adam Harveythompson, G F Swadling, G Burdiak, L Pickworth, E KhooryAbstract:Coiled arrays, a cylindrical array in which each wire is formed into a single helix, suppress the modulation of ablation at the fundamental wavelength. Instead, ablation flow is modulated at the wavelength of the coil. Large wavelength coils produce wire beaks with sufficient Axial Separation that perturbations in the implosion sheath do not merge, producing an organized mode of implosion in which the global instability can be controlled and the perturbations correlated between all the wires in the array. The inductance of the current paths that may be established by an organized implosion are considered. This suggests that, for a given inductive voltage drop across the load, coiled arrays are capable of achieving significantly higher current convergence to the axis than straight arrays. These experiments were carried out on the MAGPIE generator at Imperial College. This research was sponsored by Sandia National Laboratories Albuquerque, the SSAA program of NNSA under DOE Cooperative Agreement DE-FC03-02NA00057.
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modifying wire array z pinch ablation structure and implosion dynamics using coiled wires
IEEE Transactions on Plasma Science, 2009Co-Authors: G Hall, S V Lebedev, S N Bland, J P Chittenden, F Suzukividal, Adam Harveythompson, G F Swadling, J B A Palmer, N Niasse, S C BottAbstract:Coiled arrays, which are cylindrical arrays in which each wire is formed into a helix, suppress the modulation of ablation at the fundamental wavelength. Outside the vicinity of the wire cores, ablation flow from coiled arrays is modulated at the coil wavelength and has a two-stream structure in the r, thetas plane. Within the vicinity of the helical wires, ablation is concentrated at positions with the greatest azimuthal displacement, and plasma is Axially transported from these positions such that the streams become aligned with the sections of the coil furthest from the array axis. The GORGON MHD code accurately reproduces this observed ablation structure, which can be understood in terms of J times B forces that result from the interaction of the global magnetic field with a helical current path as well as additional current paths suggested by the simulations. With this ability to control where the ablation streamers occur, large wavelength coils were constructed such that the breaks that form in the wires had sufficient Axial Separation to prevent perturbations in the implosion sheath from merging. This produced a new mode of implosion in which the global instability can be controlled, and perturbations correlated between all wires in an array. For large-wavelength eight-wire coiled arrays, this produced a dramatic increase in X-ray power, equaling that of a 32-wire straight array. These experiments were carried out on the mega ampere generator for plasma implosion experiments (1 MA, 240 ns) at Imperial College London, London, U.K.
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modifying wire array z pinch ablation structure and implosion dynamics using coiled arrays
International Conference on Plasma Science, 2008Co-Authors: G N Hall, S V Lebedev, S N Bland, J P Chittenden, F Suzukividal, J B A Palmer, S C BottAbstract:Coiled arrays, a cylindrical array in which each wire is formed into a helix, suppress the modulation of ablation at the fundamental wavelength. Outside the vicinity of the wire cores, ablation flow from coiled arrays is modulated at the coil wavelength and has a 2-stream structure in the r,thetas plane. Within the vicinity of the helical wires, ablation is concentrated at positions with the greatest azimuthal displacement and plasma is Axially transported from these positions such that the streams become aligned with sections of the coil furthest from the array axis. The GORGON MHD code accurately reproduces this observed ablation structure, which can be understood in terms of Axial JxB forces that result from the interaction of the global magnetic field with radial components of a helical current path as well as additional current paths suggested by the simulations. With this ability to control where ablation streamers occur, large wavelength coils were constructed such that the breaks that form in the wires had sufficient Axial Separation to prevent perturbations in the implosion sheath from merging. This produces a new, organised mode of implosion in which the global instability can be controlled and the perturbations correlated between all the wires in the array. For large wavelength 8-wire coiled arrays, this produced a dramatic increase in x-ray power, equaling the x-ray power of a 32-wire straight array. These experiments were carried out on the MAGPIE generator (IMA, 240ns) at Imperial College, London.