FIRST MEASUREMENT RESULTS AT THE LEG PROJECT’S 100 keV DC GUN TEST STAND

The Low Emittance Gun Project (LEG) at PSI [1] aims at developing a high-brightness, high-current electron source: a 20-fold improved brightness compared to present state-of-the-art electron guns. The source is intended to form the basis for a cost-efficient implementation of a high-power X-ray FEL light-source for scientific research at PSI. A field emitter array (FEA) cathode is being considered a source candidate. In order to study pulsed field emission from such a cathode and to investigate space charge com-pensation techniques as well as to develop diagnostic pro-cedures to characterize the beam resulting from an FEA cathode, a 100 keV DC gun test stand has been built. The test stand gun and diagnostics have been modeled with the codes MAFIA and GPT [2]. From extensive parame-ter studies an optimized design has been derived [3] and construction of the gun and diagnostics have recently been completed. We report on the commissioning of the test stand and present first measurement results