Theory and particle tracking simulations of a resonant radiofrequency deflection cavity in TM$_{110}$ mode for ultrafast electron microscopy
| Autor: | O.J. Luiten, J.F.M. van Rens, A. Lassise, Peter H. A. Mutsaers, E. R. Kieft, J.G.H. Franssen, X. F. D. Stragier, W. Verhoeven |
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| Přispěvatelé: | Coherence and Quantum Technology, Center for Quantum Materials and Technology Eindhoven |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Accelerator Physics (physics.acc-ph)
FOS: Physical sciences Physics::Optics 02 engineering and technology 01 natural sciences law.invention Optics law 0103 physical sciences Thermal emittance 010306 general physics Instrumentation Physics business.industry 021001 nanoscience & nanotechnology Transfer matrix Atomic and Molecular Physics and Optics Charged particle Electronic Optical and Magnetic Materials Transverse plane Phase space Temporal resolution Physics::Accelerator Physics Physics - Accelerator Physics Electron microscope 0210 nano-technology business Ultrashort pulse Optics (physics.optics) Physics - Optics |
| Zdroj: | Ultramicroscopy, 184B, 77-89. Elsevier |
| ISSN: | 0304-3991 |
| Popis: | We present a theoretical description of resonant radiofrequency (RF) deflecting cavities in TM$_{110}$ mode as dynamic optical elements for ultrafast electron microscopy. We first derive the optical transfer matrix of an ideal pillbox cavity and use a Courant-Snyder formalism to calculate the 6D phase space propagation of a Gaussian electron distribution through the cavity. We derive closed, analytic expressions for the increase in transverse emittance and energy spread of the electron distribution. We demonstrate that for the special case of a beam focused in the center of the cavity, the low emittance and low energy spread of a high quality beam can be maintained, which allows high-repetition rate, ultrafast electron microscopy with 100 fs temporal resolution combined with the atomic resolution of a high-end TEM. This is confirmed by charged particle tracking simulations using a realistic cavity geometry, including fringe fields at the cavity entrance and exit apertures. |
| Databáze: | OpenAIRE |
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