Well characterized 1019W cm2 operation of VULCAN - An ultra-high power Nd:glass laser by Danson, C, Collier, J, Neely, D, Barzanti, L, Damerell, A, Edwards, C, Hutchinson, M, Key, M, Norreys, P, Pepler, D, Ross, I, Taday, P, Toner, W, Trentelman, M, Walsh, F, Winstone, T, Wyatt, R