Estimation of ion accelerating potential inside the nanosecond pulsed laser produced tungsten plasma Ashiq H. Dogar, Shahab A. Abbasi, Hamza Qayyum, Shakir Ullah and Abdul Qayyum Eur. Phys. J. D, 71 10 (2017) 250 Published online: 12 October 2017 DOI: 10.1140/epjd/e2017-80368-2