Solenoid transport of beams with current-dependent initial conditions
| Autor: | John R. Harris, Brian R. Poole, John W. Lewellen |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 122:093302 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.5000698 |
| Popis: | Intense charged particle beams will generally be formed with an initial correlation between their longitudinal properties, including longitudinal variations in current, and their transverse properties, including their radius and divergence. This is due to the competition between the transverse focusing fields in the beam source and the time-varying space charge forces in the beam. In DC electron guns where the current modulation is slow compared to the electron transit time, the nature of these correlations was previously shown to depend on the gun geometry, exhibiting a linear dependence of the beam radius and divergence on the beam current at the gun exit. Here, we extend the previous work to study the transport of beams with such correlation in uniform and periodic solenoid channels. For each transport channel configuration studied, the transverse envelope equation is used to calculate the envelope of 101 beam slices differing in their slice currents, as well as initial radius and divergence (due to th... |
| Databáze: | OpenAIRE |
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