Focusing of relativistic electrons in dense plasma using a resistivity-gradient-generated magnetic switchyard |
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Authors: | Robinson A P L Key M H Tabak M |
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Institution: | Central Laser Facility, Rutherford-Appleton Laboratory, Chilton, Oxon., OX11 0QX, United Kingdom. |
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Abstract: | A method for producing a self-generated magnetic focussing structure for a beam of laser-generated relativistic electrons using a complex array of resistivity gradients is proposed and demonstrated using numerical simulations. The array of resistivity gradients is created by using a target consisting of alternating layers of different Z material. This new scheme is capable of effectively focussing the fast electrons even when the source is highly divergent. The application of this technique to cone-guided fast ignition inertial confinement fusion is considered, and it is shown that it may be possible to deposit over 25% of the fast electron energy into a hot spot even when the fast electron divergence angle is very large (e.g., 70° half-angle). |
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