SOL width scale lengths in NSTX

The SOL T$_{e}$ and n$_{e}$ profiles have been investigated with a mid-plane fast reciprocating probe in NSTX. The SOL plasma consists of two regions; a region close to the LCFS where a steep gradient of the profile is observed (\textit{ie} near SOL region) and a region further away from the LCFS where a flatter profile is observed (\textit{ie} far SOL region). It was observed that the near SOL T$_{e}$ and n$_{e}$ decay lengths ($\lambda _{Te} $ and $\lambda _{ne})$ became significantly longer in L-mode compared to H-mode (a factor of $\sim $2 increase in $\lambda _{Te}$ and $\sim $3 increase in $\lambda _{ne})$. It was found that both $\lambda _{Te}$ and $\lambda _{ne}$ in the near SOL decrease with increasing plasma current (I$_{p})$ in H-mode (from $\lambda _{Te} \sim $3cm to $\sim $1cm and $\lambda _{ne} \sim $2cm to $\sim $1cm with I$_{p}$ variation from 0.8MA to 1MA). Near SOL $\lambda _{Te}$ and $\lambda _{ne}$ in L-mode increased ($\lambda _{Te} \sim $0.7cm to $\sim $1.1cm and $\lambda _{ne} \sim $1.5cm to $\sim $2.1cm) with increasing line averaged density (from 2.7 to 3.1x10$^{13}$cm$^{-3})$ and decreased ($\lambda _{Te} \sim $1.7cm to 0.4cm and $\lambda _{ne} \sim $1.3cm to 0.5cm) with increasing input power (P$_{NBI}\sim $1MW to 4MW). A comparison with Thomson Scattering (TS) data shows a reasonably good match for T$_{e}$ and n$_{e}$ profiles. \textit{This work was supported by U.S. DOE contract {\#} }\textit{DE-FG02-03ER54731 and }\textit{DE-AC02-76CH03073}$.$