Design and implementation of the location of SFILP for HL-2A

Fast ion loss detector (FILD) is an important tool to study the confinements and transportation on tokamak devices, since it can simultaneously measure the energy and pitch angle of lost fast ions. Considering the measurement range of energy and pitch angle on HL-2A, it used Lorentz orbit code to calculate escaping fast ion orbits to contribute to the selection of the position of the probe head for sFILD. It ensured that lost fast ions can reach the probe head in the position that we selected. In addition, it also developed a translation and rotation system for the probe head to realize the lost fast ion detection at random radical position with random angle. (authors)