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thermal-emittance

Paper Title Other Keywords Page
THPP042 Measurements of Thermal Emittance for Cesium Telluride Photocathodes at PITZ emittance, electron, cathode, laser 560
 
  • V. Miltchev, J.W. Baehr, H.-J. Grabosch, J.H. Han, M. Krasilnikov, A. Oppelt, B. Petrosyan, L. Staykov, F. Stephan
    DESY Zeuthen, Zeuthen
  • M.V. Hartrott
    BESSY GmbH, Berlin
  
 

Funding: This work has partly been supported by the European Community, contract numbers RII3-CT-2004-506008 and 011935, and by the 'Impuls- und Vernetzungsfonds' of the Helmholtz Assciation, contract number VH-FZ-005

The thermal emittance determines the lower emittance limit and its measurement is of high importance to understand the ultimate injector performance. In this contribution we present results of thermal emittance measurements under rf operation conditions for various Cs2Te cathodes and different accelerating gradients. Measurements of thermal emittance scaling with the cathode laser spot size are presented and analysed. The significance of the Schottky effect in the emittance formation process is discussed.