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| Title | Spectrometer for Laser-pulsed Electrons from Field Emission Cathodes | |||||
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| Abstract | 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. | |||||
| Footnotes & References | * B. Bornmann et al., Rev. Sci. Instrum. 83, 013302 (2012). ** S. Mingels et al., Proc. FEL2013, New York, USA, p. 339. |
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| Funding | German Federal Ministry of Education and Research (BMBF). Project number: 05K13PX2. | |||||
| Paper | download MOPRI029.PDF [0.584 MB / 3 pages] | |||||
| Export | download ※ BibTeX ※ LaTeX ※ Text/Word ※ RIS ※ EndNote | |||||
| Conference | IPAC2014, Dresden, Germany | |||||
| Series | International Particle Accelerator Conference (5th) | |||||
| Proceedings | Link to full IPAC2014 Proccedings | |||||
| Session | Poster Session, Ribery Area | |||||
| Date | 16-Jun-14 16:00–18:00 | |||||
| Main Classification | 03 Particle Sources and Alternative Acceleration Techniques | |||||
| Sub Classification | T02 Electron Sources | |||||
| Keywords | electron, cathode, laser, detector, controls | |||||
| Publisher | JACoW Publishing, Geneva, Switzerland | |||||
| Editors | Christine Petit-Jean-Genaz (CERN, Geneva, Switzerland); Gianluigi Arduini (CERN, Geneva, Switzerland); Peter Michel (HZDR, Dresden, Germany); Volker RW Schaa (GSI, Darmstadt, Germany) | |||||
| ISBN | 978-3-95450-132-8 | |||||
| Published | July 2014 | |||||
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