{'fraction_non_alphanumeric': 0.027885360185902403, 'fraction_numerical': 0.004647560030983733, 'mean_word_length': 5.558375634517766, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
The X-ray wakefield acceleration regime

The wake structure generated by the interaction of a laser pulse with an underdense plasma has been demonstrated to accelerate electrons to GeV energy within acceleration lengths ∼ 1cm [1]. The similarity laws suggest that a similar wakefield regime can be realized also using Xrays of sufficiently high amplitude in solid density plasmas [2], which gives promise to new applications. However, creating the X-ray source of needed amplitude constitutes a major challenge. The relativistic electron spring mechanism (RES) [3] provides a way to generate electromagnetic bursts with both decreased wavelength and increased amplitude, keeping the pulse amplitude relativistic. These bursts can thus efficiently excite wakefield processes in solid density plasmas. In the X-ray wakefield acceleration (XWFA) regime, an important role can be played by a number of previously negligible processes such as radiation reaction, strong field QED effects, Bremsstrahlung and discreteness of plasma particles. Assuming realistic parameters [4], we investigate the XWFA regime using the three dimensional Particle-In-Cell (PIC) code ELMIS incorporating QED effects [5] and present the prospects of the XWFA regime for electron acceleration and radiation generation.