On the capillary discharge in the high repetition rate regime

• DOI: 10.48550/arxiv.2305.19679
• Publication Date: 2023-01-01
• Authors: Sasorov, P.; Bagdasarov, G.; Bobrova, N.; Grittani, G.; Molodozhentsev, A.; Bulanov, S. V.
• Keywords: Plasma Physics (physics.plasm-ph); FOS: Physical sciences; 7. Clean energy; Physics - Plasma Physics

We investigate the main physical processes that limit the repetition rate of capillary discharges used in laser accelerators of electrons theoretically and with computer simulations. We consider processes in the capillary. We assume that a cooling system independently maintains temperature balance of the capillary, as well as a gas supply system and a vacuum system maintain conditions outside the capillary. The most important factor, determining the highest repetition rates in this case, is the capillary length, which governs a refilling time of the capillary by the gas. For a short capillary, used for acceleration of sub-GeV electron beams, the repetition rate approximately equal to 10 kHz, which is inversely proportional to the square of the capillary length. The effects of the capillary diameter, gas type and the gas density are weaker.<br/>14 pages, 17 figures<br/>