Sep 15 – 21, 2019
Hotel Hermitage, La Biodola Bay, Isola d'Elba, Italy
Europe/Rome timezone

Transverse Beam Breakup Instability in Dielectric Laser Accelerators

Sep 16, 2019, 7:00 PM
Parking Area (Hotel Hermitage)

Parking Area

Hotel Hermitage

poster WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures Cheese and Wine Poster Session 1


Thilo Egenolf (TEMF, TU Darmstadt)


Dielectric laser acceleration (DLA) is one of the advanced concepts for more compact accelerators. DLA gratings have apertures within the range of optical wavelengths. Wakefields limit the beam intensities of relativistic electrons required for possible applications. Particle tracking is needed to study the intensity limitations due to nonlinear laser fields in combination with wakefields. For this, we present the addition of self-consistent wake kicks to our tracking code DLAtrack6D. The literature on conventional linear accelerators introduces analytical models to describe the transverse beam breakup instability. The comparison of tracking results with these models shows that the respective intensity limits are also valid for DLA gratings, which limits the bunch charge to less than a femtocoulomb. Furthermore, we analyze the nonlinear dynamics in alternating phase focusing (APF) channels by calculating tune footprints of various bunch distributions. The APF scheme confines the beam longitudinally and in one transverse direction by alternating focusing and defocusing phases. We present tune spectrograms, i.e. tune spectra as function of the independent variable, calculated by reconstructing the single particle one-cell matrix. This is the basis to study damping mechanisms as BNS damping of the transverse beam breakup instability in DLA gratings.

Primary author

Thilo Egenolf (TEMF, TU Darmstadt)


Uwe Niedermayer (TEMF, TU-Darmstadt) Oliver Boine-Frankenheim (Technische Universität Darmstadt)

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