Fig. 1. Schematic diagram of Shanghai advance proton therapy facility APTRON, except the 5^th and 6^th treatment room

Fig. 2. Logical diagram of alternating-phase-focused (APF) design code

Fig. 3. Electromagnetic design of APF cavity

Fig. 4. Cold test of APF cavity, using perturbation method

Fig. 5. Comparison between CST simulated electric field (green) and network analyzer measured electric field (blue), the consistency index of integral field under this situation is 0.0296

Fig. 6. Linac injector and beam diagnostic system in commissioning

Fig. 7. Relation between initial phase and final energy of ideal particle

Fig. 8. Beam signal in oscilloscope