Effects of magnetic wiggler field and chirped laser pulse on the wakefield amplitude and electron energy gain in a wiggler-assisted laser wakefield acceleratorA. Dezhpour, S. Jafari and H. MehdianEur. Phys. J. Plus, 133 11 (2018) 473DOI: https://doi.org/10.1140/epjp/i2018-12281-9