High Power Laser and Particle Beams, Volume. 37, Issue 7, 074002(2025)
Simulation analysis and optimization design of RF grid-controlled electron gun
Figures & Tables(13)
Fig. 2. Normalized RMS emittance distribution in electron gun and drift section
Fig. 4. Distribution of transit time of particles in different phases
Fig. 7. Longitudinal distribution of normalized RMS emittance in the electron gun for different grid structures
Fig. 9. Longitudinal distribution of the normalized RMS emittance in the electron gun for different focusing electrode angles
Table 1. Partial verification of Equation (13) and CST simulation results
View tableView in ArticleTable 1. Partial verification of Equation (13) and CST simulation results
radius/mm phase/(°) geometric RMS emmittance (simulation)/(mm·mrad) geometric RMS emmittance (fomula)/(mm·mrad) 1.500 11.0 59.31 59.19 0.645 13.5 31.41 31.38 0.645 21.5 50.92 50.90
Table 2. Results of particles in each phase
View tableView in ArticleTable 2. Results of particles in each phase
phase/(°) grid voltage/V anode simulated current/mA cathode simulated current/mA transmittance/% nomalized RMS emmtiance/(mm·mrad) 36 26.336 19.074 25.361 0.752 100 2.880 42 50.739 42.085 58.219 0.722 874 2.190 48 72.943 67.050 94.741 0.707 719 1.680 54 92.705 92.069 131.775 0.698 683 1.300 60 109.808 115.547 166.887 0.692 367 1.070 66 124.064 144.451 210.475 0.686 310 0.828 72 135.317 160.944 235.677 0.682 901 0.681 78 143.444 174.412 256.316 0.680 457 0.613 84 148.357 183.429 270.134 0.679 030 0.576 90 150.000 186.040 274.511 0.677 714 0.569 96 148.357 183.429 270.134 0.679 030 0.576 102 143.444 174.412 256.316 0.680 457 0.613 108 135.317 160.944 235.677 0.682 901 0.681 114 124.064 144.451 210.475 0.686 310 0.828 120 109.808 115.547 166.887 0.692 367 1.070 126 92.705 92.069 131.775 0.698 683 1.300 132 72.943 67.05 94.741 0.707 719 1.680 138 50.739 42.085 58.219 0.722 874 2.190 144 26.336 19.074 25.361 0.752 100 2.880
Table 3. Results of particles in each phase
View tableView in ArticleTable 3. Results of particles in each phase
phase/(°) grid voltage/V anode theoretical current/mA anode simulated current/mA cathode simulated current/mA transmittance/% nomalized RMS emmtiance/(mm·mrad) 36 26.336 2.590 3.915 4.984 0.785 514 1.200 42 50.739 6.927 8.149 11.640 0.700 086 0.940 48 72.943 11.940 13.211 19.100 0.691 675 0.756 54 92.705 17.107 18.32 26.684 0.686 554 0.621 60 109.808 22.053 23.138 33.888 0.682 779 0.521 66 124.064 26.484 27.403 40.313 0.679 756 0.482 72 135.317 30.168 30.926 45.639 0.677 622 0.436 78 143.444 32.926 33.553 49.619 0.676 213 0.384 84 148.357 34.632 35.173 52.077 0.675 404 0.351 90 150.000 35.209 35.27 56.390 0.625 466 0.321 96 148.357 34.632 35.173 52.077 0.675 404 0.351 102 143.444 32.926 33.553 49.619 0.676 213 0.384 108 135.317 30.168 30.926 45.639 0.677 622 0.436 114 124.064 26.484 27.403 40.313 0.679 756 0.482 120 109.808 22.053 23.138 33.888 0.682 779 0.521 126 92.705 17.107 18.320 26.684 0.686 554 0.621 132 72.943 11.940 13.211 19.100 0.691 675 0.756 138 50.739 6.927 8.149 11.640 0.700 086 0.940 144 26.336 2.590 3.915 4.984 0.785 514 1.200
Table 4. Effects of different focusing angles on the normalized RMS emittance and TWISS parameters at the anode outlet
View tableView in ArticleTable 4. Effects of different focusing angles on the normalized RMS emittance and TWISS parameters at the anode outlet
${\varepsilon _{{\mathrm{n}},{\mathrm{RMS}}}} $ α β/m γ/m−1 67.5° 0.4918 −0.9757 0.08205 23.8 60° 0.2617 −0.4925 0.01403 88.5 45° 0.2732 −0.1349 0.01302 78.2
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Yujie Wang, Xiaozhong He, Zhen Qin, Ruo Tang. Simulation analysis and optimization design of RF grid-controlled electron gun[J]. High Power Laser and Particle Beams, 2025, 37(7): 074002
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Received: Jan. 15, 2025
Accepted: Jun. 10, 2025
Published Online: Jul. 18, 2025
The Author Email: Xiaozhong He (hexiaozhong@tsinghua.org.cn)
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