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Title: Tip-based source of femtosecond electron pulses at 30 keV

We present a nano-scale photoelectron source, optimized for ultrashort pulse durations and well-suited for time-resolved diffraction and advanced laser acceleration experiments. A tungsten tip of several-ten-nanometers diameter mounted in a suppressor-extractor electrode configuration allows the generation of 30 keV electron pulses with an estimated pulse duration of 9 fs (standard deviation; 21 fs full width at half maximum) at the gun exit. We infer the pulse duration from particle tracking simulations, which are in excellent agreement with experimental measurements of the electron-optical properties of the source in the spatial domain. We also demonstrate femtosecond-laser triggered operation of the apparatus. The temporal broadening of the pulse upon propagation to a diffraction sample can be greatly reduced by collimating the beam. Besides the short electron pulse duration, a tip-based source is expected to feature a large transverse coherence and a nanometric emittance.
Authors:
;  [1] ; ; ; ; ;  [1] ;  [2] ;  [1] ;  [2]
  1. Max Planck Institute of Quantum Optics, Hans-Kopfermann-Str. 1, 85748 Garching (Germany)
  2. (Germany)
Publication Date:
OSTI Identifier:
22277940
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 07 ISOTOPES AND RADIATION SOURCES; ACCELERATION; COMPUTERIZED SIMULATION; DIFFRACTION; ELECTRODES; ELECTRONS; LASERS; NANOSTRUCTURES; OPTICAL PROPERTIES; PHOTOELECTRON SPECTROSCOPY; PULSES; TIME RESOLUTION; TUNGSTEN