Analytical modeling of longitudinal beam dynamics in an RF-gun: From almost zero to relativistic velocities
| Autor: | P. Puzo, Thomas Vinatier, Christelle Bruni |
|---|---|
| Přispěvatelé: | Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Nuclear and High Energy Physics Field (physics) 010308 nuclear & particles physics Electron ASTRA 01 natural sciences Transfer matrix Photocathode 030218 nuclear medicine & medical imaging Computational physics 03 medical and health sciences 0302 clinical medicine 0103 physical sciences Cathode ray [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] Physics::Accelerator Physics [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] Instrumentation Beam (structure) ComputingMilieux_MISCELLANEOUS Electron gun |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier, 2020, 953, pp.162914. ⟨10.1016/j.nima.2019.162914⟩ |
| ISSN: | 0168-9002 |
| Popis: | We develop and test a model for the longitudinal beam dynamics in an RF-gun consisting in a single and fully analytical transfer matrix. This model deals with the main difficulty of beam dynamics in an RF-gun, which is the velocity variation from almost zero to relativistic one along the beam path, by splitting the gun into two zones. A first one, close to the photocathode, where the accelerating field is assumed to be electrostatic. A second one, farther away from the photocathode, where the electron beam is assumed to be ultra-relativistic. We investigate the capability of the model through comparisons with ASTRA simulations, and measurements performed on the PITZ and PHIL facilities. These comparisons show that the agreement with the analytical model is globally good for the cases where the electron bunch has a low density, and is deteriorated when this density increases due to the growing effect of space-charge forces. The agreement with the analytical model is also found to be dependent on the type of RF-gun considered. The comparisons we made also reveal some limitations of the model, for most of which we propose simple practical solutions. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect