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Following the successful profile measurement of an 80 MeV negative hydrogen (H⁻) beam using a laser wire monitor at the China Spallation Neutron Source(CSNS), an emittance measurement system with a Low-Gain Avalanche Diode (LGAD) sensor has been developed and is currently under commissioning this year. This system utilizes the LGAD to reconstruct the spatial distribution of neutral hydrogen atoms (H0) generated through laser photodetachment. By combining this distribution with laser wire position, it enables complete phase-space reconstruction and accurate emittance measurement of the H⁻ beam. This paper focuses on the design and characterization of the LGAD-based H0 distribution measurement system, including H0 energy deposition simulation, LGAD sensor performance characterization, the design of a ceramic PCB readout board, and local signal response tests. The proposed system offers a promising non-interceptive, high-precision solution for negative hydrogen beam emittance measurement.
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