Long Term Evolution of Plasma Wakefields
| Autor: | Sahai, Aakash A., Katsouleas, T. C., Tsung, F. S., Mori, W. B. |
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| Rok vydání: | 2014 |
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| Druh dokumentu: | Working Paper |
| Popis: | We study the long-term evolution (LTE) of plasma wakefields over multiple plasma-electron periods and few plasma-ion periods, much less than a recombination time. The evolution and relaxation of such a wakefield-perturbed plasma over these timescales has important implications for the upper limits of repetition-rates in plasma colliders. Intense fields in relativistic lasers (or intense beams) create plasma wakefields (modes around {\omega}pe) by transferring energy to the plasma electrons. Charged-particle beams in the right phase may be accelerated with acceleration/focusing gradients of tens of GeV/m. However, wakefields leave behind a plasma not in equilibrium, with a relaxation time of multiple plasma-electron periods. Ion motion over ion timescales, caused by energy transfer from the driven plasma-electrons to the plasma-ions can create interesting plasma states. Eventually during LTE, the dynamics of plasma de-coheres (multiple modes through instability driven mixing), thermalizing into random motion (second law of thermodynamics), dissipating energy away from the wakefields. Wakefield-drivers interacting with such a relativistically hot-plasma lead to plasma wakefields that differ from the wakefields in a cold-plasma. Comment: North American Particle Accelerator Conference, Sep 2013, Pasadena, CA, USA (MOPAC10, ISBN 978-3-95450-138-0) http://accelconf.web.cern.ch/accelconf/pac2013/papers/mopac10.pdf 03- Alternative Acceleration Schemes, A23 - Laser-driven Plasma Acceleration, pp.90-92 |
| Databáze: | arXiv |
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