Proposed dielectric-based microstructure laser-driven undulator

Abstract

We describe a proposed all-dielectric laser-driven undulator for the generation of coherent short wavelengths and explore the required electron beam parameters for its operation. The key concept for this laser-driven undulator is its ability to provide phase synchronicity between the deflection force from the laser and the electron beam for a distance that is much greater than the laser wavelength. Because of the possibility of high-peak electric fields from ultrashort pulse lasers on dielectric materials, the proposed undulator is expected to produce phase-synchronous GV=m deflection fields on a relativistic electron bunch and therefore lead to a very compact free electron based radiation device.

Summary report of working group 3: Laser and high-gradient structure-based acceleration

“…In addition to acceleration, extending the scale of DLA structures beyond ~1 mm necessitates the addition of focusing elements [4]. K. Wootton of SLAC presented a conceptual design for a deflecting structure that incorporates three square-faced pillars of different heights.…”

Isolated few-cycle radiation from chirped-pulse compression of a superradiant free-electron laser

“…With a 1-nm bunch length and an EUV wavelength of ∼15 nm, the bunch form factor is close to one. To integrate with a DLA, one could consider a dielectric laser undulator [25] with a peak undulator field of 3.3 T subject to the 1 GV=m laser damage field on dielectric for an incident fs laser pulse [26]. The chosen undulator length is 157.5 mm long, consisting of 150 undulator periods with a period length of 1.05 mm.…”

Optimized operation of dielectric laser accelerators: Multibunch

“…Bounded by gradient limitations (∼100 MV/m), it has been shown [1][2][3] that net acceleration could be achieved by a train of microbunches spaced at the optical period. However, some applications require significantly higher accelerating gradients than provided by conventional rf linear accelerators, such as compact radiotherapy devices [4] and miniaturized light sources [5,6].…”