Method for measuring beam divergence angle of high-current particle beam based on one- dimensional carbon fiber composite material

A method for measuring a beam divergence angle of a high-current particle beam based on a one-dimensional carbon fiber composite material, comprising:

• step 1, setting collection parameters of an infrared camera according to measurement requirements;
• step 2, acquiring infrared images of a diagnosis calorimeter and temperature data files in a csv format before and after beam current bombardment of a high-current particle beam, wherein temperature data in the temperature data files in the csv format corresponds to temperature distribution on a back of the one-dimensional CFC diagnosis calorimeter, where CFC represents a one-dimensional carbon fiber composite material;
• step 3, converting the temperature data files in the csv format that contain the temperature data into an RGB picture format;
• step 4, performing perspective distortion correction on the picture files converted in step 3 through the one-dimensional CFC diagnosis calorimeter and a geometric installation position of the infrared camera to obtain corrected pictures;
• step 5, converting the pictures corrected in step 4 into temperature data files in a csv format for data analysis and processing;
• step 6, performing subtraction on temperature data at different moments in step 5 and temperature data at an initial moment before the beam current bombardment of the high-current particle beam, and forming a new temperature data file in a csv format;
• step 7, processing the new temperature data file in the csv format obtained in step 6, selecting rows and columns to be analyzed as a retrieved area, retrieving a maximum value of temperatures within the retrieved area, and performing normalized Gaussian fitting to obtain a fitted Gaussian curve;
• and
• step 8, calculating a width at a 1/e height of the fitted Gaussian curve, e being a natural constant, and calculating a beam divergence angle;
• and
• taking a half-width Δx of an abscissa corresponding to the 1/e height of the fitted curve, a half-width Δy of an ordinate and a radius r of an ion source electrode plate hole, and calculating the beam divergence angle σ in conjunction with a distance D from the one-dimensional CFC diagnosis calorimeter to an ion source electrode according to the following formula:
• σ
• =
• Δ
• ⁢
• x
• -
• r
• D
• ⁢
• or
• ⁢
• σ
• =
• Δ
• ⁢
• y
• -
• r
• D
• .