Fig. 1. Principle of Ionization profile monitor (IPM)

Fig. 2. CSNS layout and linac IPM location^[10]

Fig. 3. Overall appearance and field cage framework of IPM

Fig. 4. IPM LabVIEW acquisition program interface

Fig. 5. Relationship between IPM downstream beam loss and IPM

Fig. 6. Relationship between MCP pressure, beam current intensity and image pixel integral value (number of collected photons)

Fig. 7. Local orbit bumps and one-dimensional lifetime calibration

Fig. 8. MCP two-dimensional life calibration result

Fig. 9. Comparison of repair performance among PDE and DIP

Fig. 10. Image obtained by the IPM after installing the electromagnetic shielding and the repair result