Quantitative single shot and spatially resolved plasma wakefield diagnostics

Kasim, Muhammad Firmansyah and Holloway, James and Ceurvorst, Luke and Levy, Matthew C. and Ratan, Naren and Sadler, James and Bingham, Robert and Burrows, Philip N. and Trines, Raoul and Wing, Matthew and Norreys, Peter (2015) Quantitative single shot and spatially resolved plasma wakefield diagnostics. Physical Review Special Topics: Accelerators and Beams, 18 (8). ISSN 1098-4402

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    Diagnosing plasma conditions can give great advantages in optimizing plasma wakefield accelerator experiments. One possible method is that of photon acceleration. By propagating a laser probe pulse through a plasma wakefield and extracting the imposed frequency modulation, one can obtain an image of the density modulation of the wakefield. In order to diagnose the wakefield parameters at a chosen point in the plasma, the probe pulse crosses the plasma at oblique angles relative to the wakefield. In this paper, mathematical expressions relating the frequency modulation of the laser pulse and the wakefield density profile of the plasma for oblique crossing angles are derived. Multidimensional particle-in-cell simulation results presented in this paper confirm that the frequency modulation profiles and the density modulation profiles agree to within 10%. Limitations to the accuracy of the measurement are discussed in this paper. This technique opens new possibilities to quantitatively diagnose the plasma wakefield density at known positions within the plasma column.