A Nd:YAG Thomson scattering system has been developed for Heliotron J. The system consists of two 550 mJ 50 Hz lasers, large collection optics, and 25 radial channel (similar to 1 cm spatial resolution) interference polychromators. This measurement system achieves a S/N ratio of similar to 50 for low-density plasma (n(e) similar to 0.5 x 10(19) m(-3)). A time evolution of electron temperature profiles was measured with this system for a high-intensity gas-puff (HIGP) fueling neutral-beam-injection plasma. The peripheral temperature of the higher-density phase after HIGP recovers to the low-density pre-HIGP level, suggesting that improving particle transport in the HIGP plasma may be possible. (C) 2014 AIP Publishing LLC.