Classical and quantum beam dynamics simulation of the RF photoinjector test bench
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arXiv
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| Autores principales: | , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| author | Dyatlov, A. S. Kobets, V. V. Levichev, A. E. Maksimov, M. V. Nikiforov, D. A. Nozdrin, M. A. Popov, K. Sibiryakova, K. A. Yunenko, K. E. Karlovets, D. V. |
| author_facet | Dyatlov, A. S. Kobets, V. V. Levichev, A. E. Maksimov, M. V. Nikiforov, D. A. Nozdrin, M. A. Popov, K. Sibiryakova, K. A. Yunenko, K. E. Karlovets, D. V. |
| contents | We present beam-dynamics simulations for an S-band RF photoinjector test bench under development at the Joint Institute for Nuclear Research, aimed at producing high-quality electron beams and enabling future generation of relativistic vortex electrons with a quantized orbital angular momentum (OAM). Simulations of the 1.5-cell photogun are performed assuming an RF gradient of 45 MV/m, which, in accordance with our simulations with CST Studio, corresponds to the currently achieved input RF power of 3 MW. At low charge (Q = 0.63 pC), stable bunch formation is obtained, with weak space-charge effects and transverse emittance dominated by RF-induced correlations. Optimization of the injection phase and cathode solenoid results in a robust emittance-compensated regime with a final normalized emittance of 2.08 pi mm mrad. To assess prospects for accelerating vortex electron beams, we additionally model the quantum evolution of single-electron Laguerre-Gaussian wave packets. The results show that multi-MeV acceleration suppresses free-space spreading of the electron packet and preserves the packet's initial OAM structure, indicating that the test bench provides suitable conditions for forthcoming experimental studies of relativistic vortex electrons. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_00732 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Classical and quantum beam dynamics simulation of the RF photoinjector test bench Dyatlov, A. S. Kobets, V. V. Levichev, A. E. Maksimov, M. V. Nikiforov, D. A. Nozdrin, M. A. Popov, K. Sibiryakova, K. A. Yunenko, K. E. Karlovets, D. V. Accelerator Physics Atomic Physics We present beam-dynamics simulations for an S-band RF photoinjector test bench under development at the Joint Institute for Nuclear Research, aimed at producing high-quality electron beams and enabling future generation of relativistic vortex electrons with a quantized orbital angular momentum (OAM). Simulations of the 1.5-cell photogun are performed assuming an RF gradient of 45 MV/m, which, in accordance with our simulations with CST Studio, corresponds to the currently achieved input RF power of 3 MW. At low charge (Q = 0.63 pC), stable bunch formation is obtained, with weak space-charge effects and transverse emittance dominated by RF-induced correlations. Optimization of the injection phase and cathode solenoid results in a robust emittance-compensated regime with a final normalized emittance of 2.08 pi mm mrad. To assess prospects for accelerating vortex electron beams, we additionally model the quantum evolution of single-electron Laguerre-Gaussian wave packets. The results show that multi-MeV acceleration suppresses free-space spreading of the electron packet and preserves the packet's initial OAM structure, indicating that the test bench provides suitable conditions for forthcoming experimental studies of relativistic vortex electrons. |
| title | Classical and quantum beam dynamics simulation of the RF photoinjector test bench |
| topic | Accelerator Physics Atomic Physics |
| url | https://arxiv.org/abs/2509.00732 |