Abstract
The Accelerator on a CHip International Program (ACHIP) funded by the Gordon and Betty Moore Foundation aims to demonstrate a prototype of a fully integrated accelerator on a microchip based on laser-driven dielectric structures until 2021. Such an accelerator on a chip needs all components known from classical accelerators. This includes an electron source, accelerating structures and transverse focusing arrangements. Since the period of the accelerating field is connected to the drive laser wavelength of typically a few microns, not only longitudinal but also transverse effects are strongly phase-dependent even for few femtosecond long bunches. If both the accelerating and focusing elements are DLA-based, this needs to be taken into account. In this work we study in detail the implications of a phase-dependent focusing lattice on the evolution of the transverse phase space of a transported bunch.
Highlights
The Accelerator on a CHip International Program (ACHIP) funded by the Gordon and Betty Moore Foundation aims to demonstrate a prototype of a fully integrated accelerator on a microchip based on laser-driven dielectric structures until 2021
Current room temperature and superconducting RF (Radio-Frequency) cavities are usually limited to accelerating gradients < 100 MV/m, which can be attributed to the so called breakdown phenomena caused by high surface electric fields [1]
Mitigation Techniques we present different ways how to work around the strong phase dependence in the case of a long DLA-based transport lattice
Summary
Current room temperature and superconducting RF (Radio-Frequency) cavities are usually limited to accelerating gradients < 100 MV/m, which can be attributed to the so called breakdown phenomena caused by high surface electric fields [1]. Dielectric structures based on Si or SiO2 on the other hand can withstand up to two orders of magnitude higher surface fields if operated at optical frequencies, allowing for accelerating gradients in the range of ∼GV/m [2]. Operation at optical frequencies implies a substantial size reduction compared to conventional RF structures (six orders of magnitude smaller). This makes tailored laser-driven dielectric structures an interesting candidate for the development of compact and efficient novel particle accelerators. If in the future a fully integrated DLA-based accelerator should be able to reach high energies, a need for beam transportation along the miniaturized beamline is implied.
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