EDGE2D-EIRENE (the ‘code’) simulations show that radial electric field, E_r, in the near scrape-off layer (SOL) of tokamaks can have large variations leading to a strong local E´B shear greatly exceeding that in the core region. This was pointed out in simulations of JET plasmas with varying divertor geometry, where the magnetic configuration with larger predicted near SOL E_r was found to have lower H-mode power threshold, suggesting that turbulence suppression in the SOL by local E´B shear can be a player in the L-H transition physics [1,2]. Further code modelling of JET plasmas by changing hydrogen isotopes (H-D-T) showed that the magnitude of the near SOL E_r is lower in H cases in which the H-mode threshold power is higher [3]. From the experiment it is also known that hydrogen plasmas have poorer particle and energy confinement than deuterium plasmas, consistent with the code simulation results showing larger particle diffusion coefficients at the plasma edge, including SOL, in hydrogen plasmas [4]. All these experimental observations and code results support the hypothesis that the near SOL E´B shear can have an impact on the plasma confinement. The present work analyses neutral ionization pattern of JET plasmas with different hydrogen isotopes in cases with fixed input power and gas puffing rat e, and its impact on target electron temperature,T_e , and SOL E_r. The possibility of a self-feeding mechanism for the increase in the SOL E_r via the interplay between poloidal E´B drift and target T_e is discussed. It is also shown that reducing anomalous turbulent transport coefficients: particle diffusion and electron and ion heat conductivities, leads to higher peak target T_e and larger E_r, suggestion a possibility of a positive feedback loop, under an implicitly made assumption that the E´B shear in the SOL is capable of suppressing turbulence.