Fig. 1. Schematic diagram and intensity distribution of transition radiation

Fig. 2. Layout of Michelson interferometer

Fig. 3. Flow chart of iterative algorithm

Fig. 4. Simulation experiment outcome of the iterative algorithm

Fig. 5. Layout diagram of the HEER experimental platform

Fig. 6. data of auto-coherence curve

Fig. 7. The form factor is derived through fitting procedures

Fig. 8. comparative analysis of results between the K-K algorithm and the iterative algorithm