We have investigated the flavor changing top quark physics on the dimension-six anomalous tq gamma (q = u, c) couplings through the process pp --> p gamma gamma p --> pt (q) over barp at the LHC by considering different forward detector acceptances. In this paper, we have also examined the effects of top quark decay. The sensitivity bounds on the anomalous couplings and t --> q gamma branching ratio have been obtained at the 95% confidence level for the effective Lagrangian approach. Besides, we have investigated the effect of the anomalous couplings on single top quark spin asymmetry. (C) 2015 The Author. Published by Elsevier B.V.