Accelerator on a CHIP

Image: DLA Chamber inside

The Accelerator on a CHIP (ACHIP) International Program, led by University of Erlangen and Stanford University and funded by Gordon and Betty Moore Foundation, aims at miniaturizing electron accelerators to the chip level to reduce cost and open up more applications of electron sources in science and technology. The miniaturized electron accelerators are dielectric laser accelerators (DLAs).

The DLA concept relies on the interaction of electrons with an intense laser field inside a nanometer scale dielectric photonic structure fabricated by modern semiconductor manufacturing technology.

DLAs on CHIP are fully optically driven at repetition rates ranging from kHz to GHz range, allowing high-current with low-charge per pulse. Since they are inherently synchronized with ultrafast lasers, they are ideal tools to bring the versatility of the world of integrated photonics to the realm of electrons.

Image: Sinbad Laser

The ACHIP Program at is focused on driving a DLA with ultrafast laser pulses in the mid-infrared spectral region in the relativistic regime and is a cooperation of the UFOX Group with the DESY Accelerator Research & Development Group and the DESY Laser Group. To achieve acceleration in the relativistic regime, electrons are accelerated by a conventional RF-accelerator (ARES LINAC) to about 100 MeV before being injected into a DLA on a CHIP driven by a mid-infrared laser field. This experiment is only possible with tight synchronization between the electron bunches and the mid-infrared laser field with in a fraction of the wavelength. In these first acceleration experiments an energy gain in the range of 1 MeV is expected.
 
Participating staff: Huseyin Cankaya from the UFOX group lead by Franz Kärtner, Willi Kuropka, Frank Mayet, Florian Burkart, Luca Genovese and Francois Lemery from the DESY Accelerator Research and Development Group led by Ralf Assmann, and Christoph Mahnke, Caterina Vidoli from the DESY Laser Group led by Ingmar Hartl.

Relevant References:
[1] Niedermayer, et al., Challenges in simulating beam dynamics of dielectric laser acceleration. (2019)
[2] Mayet, et al., Simulations and plans for possible DLA experiments at SINBAD. (2018)
[3] Murari, et al., Intracavity gain shaping in millijoule-level. (2016)
[4] Murari, et al., Kagome-fiber-based pulse compression of mid-infrared picosecond pulses from a Ho:YLF amplifier. (2016)
[5] Kroetz, et al., Numerical study of spectral shaping in high energy Ho:YLF amplifiers. (2016)
[6] Kroetz, et al., Overcoming bifurcation instability in high-repetition-rate Ho:YLF regenerative amplifiers. (2015)