High Power Laser and Particle Beams, Volume. 33, Issue 11, 114001(2021)
Effects of bunch state on measurement of beam emittance and energy
Figures & Tables(12)
Fig. 3. The results of simulated measurement of the APF output beam
Fig. 4. Relationship between the magnetic field gradient of the third magnet and the position of the screen 第3块磁铁磁场梯度变化与荧光靶处 的关系
Fig. 7. Tracewin simulated beam current distribution using the Faraday cup
Table 1. Initial parameters of ideal and non-ideal bunch
View tableView in ArticleTable 1. Initial parameters of ideal and non-ideal bunch
particle bunch ${\alpha }_{x}$ $\;{\beta }_{x}$ ${\alpha }_{y}$ $\;{\beta }_{y}$ ${\alpha }_{{\textit{z}} }$ $\;{\beta }_{{\textit{z}} }$ x−x′/(mm/(π·mrad)) y−y′/(mm/(π·mrad)) ${E}_{K}$ ideal bunch 0.115 0.785 0.121 0.760 −1.861 2.781 0.314 0.315 6.98 non-ideal bunch 0.020 0.640 0.027 0.617 −3.308 1.697 0.376 0.377 6.79
Table 2. The results of the emittance at the entrance obtained by the two methods and their relative errors
View tableView in ArticleTable 2. The results of the emittance at the entrance obtained by the two methods and their relative errors
name emittance of ideal bunch (normalized RMS)/( $\mathrm{ {\text{π} } }\cdot\mathrm{m}\mathrm{m}\cdot\mathrm{m}\mathrm{r}\mathrm{a}\mathrm{d}$ emittance of non-ideal bunch (normalized RMS)/( $\mathrm{ {\text{π} } }\cdot \mathrm{m}\mathrm{m}\cdot \mathrm{m}\mathrm{r}\mathrm{a}\mathrm{d}$ direction x y x y emittance at entrance obtained by the least square method 0.302 0.302 0.821 0.433 calculated input emittance of the software 0.288 0.302 0.376 0.377 relative error/% 4.64 0 118.35 14.85
Table 3. Simulated emittance measurement results after changing phase difference
View tableView in ArticleTable 3. Simulated emittance measurement results after changing phase difference
j0−j/(°) initial beam emittance (normalized RMS)/( $\mathrm{ {\text{π} } }\cdot\mathrm{m}\mathrm{m}\cdot\mathrm{m}\mathrm{r}\mathrm{a}\mathrm{d}$ fitting the emittance of beam (normalized RMS)/( $\mathrm{ {\text{π} } }\cdot\mathrm{m}\mathrm{m}\cdot\mathrm{m}\mathrm{r}\mathrm{a}\mathrm{d}$ relative error/% direction x y x y x y 1080 0.376 0.377 0.337 0.357 10.37 5.3 1260 0.376 0.377 0.363 0.364 3.46 3.45 1440 0.376 0.377 0.402 0.370 6.91 1.86 1620 0.376 0.377 0.457 0.376 21.54 0.27 1800 0.376 0.377 0.515 0.383 36.97 1.59 2160 0.376 0.377 0.774 0.410 105.85 3.3 2340 0.376 0.377 0.819 0.432 117.82 14.59
Table 4. Simulation results of beam energy measured by analyzing magnet
View tableView in ArticleTable 4. Simulation results of beam energy measured by analyzing magnet
particle bunch the highest point where the current through slit2 deviates from point J/mm energy spread/ MeV degree of energy spread/% relative error with standard energy /% ideal bunch −0.375 0.07444 1.2 0.09 non-ideal bunch −7.5 0.0796 1.15 1.77
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Chaofan An, Xiucui Xie, Yuehu Pu. Effects of bunch state on measurement of beam emittance and energy[J]. High Power Laser and Particle Beams, 2021, 33(11): 114001
Paper Information
Category: Particle Beams and Accelerator Technology
Received: Jul. 20, 2021
Accepted: --
Published Online: Dec. 1, 2021
The Author Email: Xie Xiucui (xiexiucui@sinap.ac.cn)
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