A kiloelectron-volt ultrafast electron micro-diffraction apparatus using low emittance semiconductor photocathodes

Abstract

We report the design and performance of a time-resolved electron diffraction apparatus capable of producing intense bunches with simultaneously single digit micron probe size, long coherence length, and $200$ fs rms time resolution. We measure the 5d (peak) beam brightness at the sample location in micro-diffraction mode to be $7\times 10^{13}\mathrm{A}/{\text{m}}^2{\text{-rad}}^2$. To generate high brightness electron bunches, the system employs high efficiency, low emittance semiconductor photocathodes driven with a wavelength near the photoemission threshold at a repetition rate up to 250 kHz. We characterize spatial, temporal, and reciprocal space resolution of the apparatus. We perform proof-of-principle measurements of ultrafast heating in single crystal Au samples and compare experimental results with simulations that account for the effects of multiple-scattering.

arXiv comment13 pages, 10 figures, submitted to Structural Dynamics

References in corpus (25)

• Ultrafast switching to a stable hidden topologically protected quantum state in an electronic crystal
• High Dynamic Range Pixel Array Detector for Scanning Transmission Electron Microscopy
• Ultrafast transmission electron microscopy using a laser-driven field emitter: femtosecond resolution with a high coherence electron beam
• New electron source concept for single-shot sub-100 fs electron diffraction in the 100 keV range
• From attosecond to zeptosecond coherent control of free-electron wave functions using semi-infinite light fields
• Direct measurement of sub-10 fs relativistic electron beams with ultralow emittance
• Ultrafast Generation and Control of an Electron Vortex Beam via Chiral Plasmonic Near Fields
• Phase-ordering of charge density waves traced by ultrafast low-energy electron diffraction
• Coherent and incoherent electron-phonon coupling in graphite observed with radio-frequency compressed ultrafast electron diffraction
• Ultrafast nano-imaging of the order parameter in a structural phase transition
• Achieving 50 femtosecond resolution in MeV ultrafast electron diffraction with a double bend achromat compressor
• Mapping momentum-dependent electron-phonon coupling and non-equilibrium phonon dynamics with ultrafast electron diffuse scattering
• Ultrafast manipulation of mirror domain walls in a charge density wave
• Femtosecond compression dynamics and timing jitter suppression in a terahertz-driven electron bunch compressor
• meV resolution in laser-assisted energy-filtered transmission electron microscopy
• Terahertz streaking of few-femtosecond relativistic electron beams
• Solving the Jitter Problem in Microwave Compressed Ultrafast Electron Diffraction Instruments: Robust Sub-50 fs Cavity-Laser Phase Stabilization
• Ultracold electrons via Near-Threshold Photoemission from Single-Crystal Cu(100)
• The development and applications of ultrafast electron nanocrystallography
• Ultrafast Relativistic Electron Nanoprobes
• Ultrafast laser pulse heating of metallic photocathodes and its contribution to intrinsic emittance
• Compact ultracold electron source based on a grating magneto optical trap
• The Role of Low Intrinsic Emittance in Modern Photoinjector Brightness
• Multi-objective Optimizations of a Novel Cryo-cooled DC Gun Based Ultra Fast Electron Diffraction Beamline
• Dynamical bunching and density peaks in expanding Coulomb clouds

Cited by in corpus (7)

• Atomically smooth films of CsSb: a chemically robust visible light photocathode
• Accurate quantification of lattice temperature dynamics from ultrafast electron diffraction of single-crystal films using dynamical scattering simulations
• Four-Dimensional Emittance Measurements of Ultrafast Electron Diffraction Optics Corrected Up to Sextupole Order
• Ultimate bunch length and emittance performance of an MeV ultrafast electron diffraction apparatus with a DC gun and a multi-cavity SRF linac
• Megahertz cycling of ultrafast structural dynamics enabled by nanosecond thermal dissipation
• Vector-based feedback of continuous wave radiofrequency compression cavity for ultrafast electron diffraction
• Ultrafast Electron Diffraction: Visualizing Dynamic States of Matter