Tsujino, S.

Paper	Title	Page
THCAU04	Peak Current Performances from Electron Sources based on Field Emission (Single Tip and Field Emitter Arrays (FEAs))	781
	R. Ganter, R. J. Bakker, M. Dehler, G. J. Gobrecht, C. Gough, E. Kirk, F. Le Pimpec, S. C. Leemann, K. L. Li, M. Paraliev, M. Pedrozzi, J.-Y. Raguin, L. Rivkin, V. Schlott, H. Sehr, S. Tsujino, A. F. Wrulich PSI, Villigen
	Reducing beam emittance while keeping high brightness is the most direct way to reduce the cost and size of Free Electron Lasers (FELs). Ultimately, beam emittance is limited by the thermal emittance at the electron source. In order to find electron sources with low thermal emittance (<5.10-8 m.rad) and high brightness (>5.1013 A.m-2.rad-2), cathodes based on single tip field emitter as well as field emitters arrays (FEAs) are investigated. Maximum peak current, measured from single tip in ZrC with a typical apex radius around one micrometer, are presented. Voltage pulses of two nanoseconds duration and up to 50 kilovolts amplitude lead to field emission current up to 470 mA from one ZrC tip. Combination of high applied electric field with laser illumination gives the possibility to modulate the emission with laser pulses. Sub-nanoseconds current pulses have been emitted with laser pulses at 1064nm illuminating a ZrC tip under high electric field. The dependence of photo-field emitted current with the applied voltage can be explained by the Schottky effect.
	Slides
	Talk