Author: Porshyn, V.
Paper Title Page
MOPRI029 Spectrometer for Laser-pulsed Electrons from Field Emission Cathodes 655
 
  • S. Mingels, B. Bornmann, D. Lützenkirchen-Hecht, G. Müller, V. Porshyn
    Bergische Universität Wuppertal, Wuppertal, Germany
 
  Funding: German Federal Ministry of Education and Research (BMBF). Project number: 05K13PX2.
In order to develop highly brilliant, pulsed electron sources based on photo-induced field emission (PFE), which combines advantages of photo and field emission (FE), a new measurement system was constructed at BUW*. In an UHV system the electrons are extracted from a cold cathode by a mesh electrode under pulsed laser illumination (3.5 ns, 10 Hz, 0.5 – 5.9 eV, > 0.3 mJ) and so far analyzed by a CW-spectrometer. Quantum efficiency investigations of flat metal (Au, Ag of different surface orientations) and semiconductor crystals (n- and p-Si**, GaN) yielded the expected work functions and revealed first hints for PFE effects. However, the kinetic energy of the electrons could not be measured with the CW-spectrometer. In addition, the achievable electric field (< 20 MV/m) was limited by parasitic FE. Hence, the system is presently upgraded with a spectrometer (resolution < 3 meV) that can handle electron pulses and a dust reduced environment is installed at the load lock. First results acquired with the upgraded apparatus on PFE cathodes will be presented at the conference.
* B. Bornmann et al., Rev. Sci. Instrum. 83, 013302 (2012).
** S. Mingels et al., Proc. FEL2013, New York, USA, p. 339.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI029  
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