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HIMM, a Heavy Ion Medical Machine, developed by Institute of Modern Physics, has been under operation since April 2020. The beam emittance of the cyclotron exit is measured with the most often used technique, i.e. slit-grid, Q-scan and 3-grid at a dedicated beam line which is not the actual HIMM optical line. The high speed data acquisition architecture is based on FPGA, and motion control system is constructed based on the NI module. The data post processing and emittance calculation based on Python with self-developed algorithm, including Levenberg’Marquardt optimization algorithm, thick lens model, dispersion effect correction, error bar fit, mismatch check, image denoise and zero-thresholding calculation, are shown in details. Finally, the data obtained from cyclotron are analyzed in this paper as well.
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