Abstract
Advanced acceleration technologies are receiving considerable interest in order to miniaturize future particle accelerators. One such technology is the dual-grating dielectric structures, which can support accelerating fields one to two orders of magnitude higher than the metal RF cavities in conventional accelerators. This opens up the possibility of enabling high accelerating gradients of up to several GV/m. This paper investigates numerically a quartz dual-grating structure which is driven by THz pulses to accelerate electrons. Geometry optimizations are carried out to achieve the trade-offs between accelerating gradient and vacuum channel gap. A realistic electron bunch available from the future Compact Linear Accelerator for Research and Applications (CLARA) is loaded into an optimized 100-period dual-grating structure for a detailed wakefield study. A THz pulse is then employed to interact with this CLARA bunch in the optimized structure. The computed beam quality is analyzed in terms of emittance, energy spread and loaded accelerating gradient. The simulations show that an accelerating gradient of 348 ± 12 MV/m with an emittance growth of 3.0% can be obtained.
Highlights
Dielectric structures have been found to withstand electric fields one to two orders of magnitude larger than metals at optical frequencies, thereby sustaining high accelerating gradients in the range of GV/m
driven accelerators (DLAs) suffer from low bunch charge and sub-femtosecond timing requirements due to the short wavelength of operation
In a DLA, a laser beam is used to accelerate particles through a microscopic channel in an artfullycrafted glass chip. Such a channel gap can be no wider than several μm [3,4,8,9,10,11,12] in order to generate a high gradient of GV/m, which limits the transverse size and the bunch charge
Summary
Dielectric structures have been found to withstand electric fields one to two orders of magnitude larger than metals at optical frequencies, thereby sustaining high accelerating gradients in the range of GV/m. In a DLA, a laser beam is used to accelerate particles through a microscopic channel in an artfullycrafted glass chip Such a channel gap can be no wider than several μm [3,4,8,9,10,11,12] in order to generate a high gradient of GV/m, which limits the transverse size and the bunch charge. DTAs can be fabricated with conventional machining techniques due to the long wavelength of operation This accommodates particle bunches with larger sizes and charges, which is more beneficial for bending and focusing [13] compared to DLAs. DTAs provide a more accurate timing jitter than DLAs. For a THz wavelength of 600 μm, 10 of optical cycle corresponds.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
