For the edge turbulence is important for the density limit and plasma confinement, a gas puffing imaging (GPI) diagnostic was proposed for J-TEXT tokamak to measure the two-dimensional turbulence in the edge region. GPI diagnostic makes use the neural gas puffing at plasma edge to increase the local visible light emission for improved temporal-spatial resolution of image for plasma fluctuations [1], [2]. On another hand, the neutral gas should be concentrated in the observation area with limit disturbance to the plasma as much as possible. So, a good performance gas puffing system is important for GPI diagnostic. This manuscript introduces the design of gas puffing system for J-TEXT GPI, including the hardware of gas line, puffing novel and remote-control unit. Test results are also presented to show the performance of this gas puffing system.

Tokamak,edge plasma turbulence,Gas puff imaging diagnostic,gas puffing system