Photocathode Behavior During High Current Running in the Cornell ERL Photoinjector

The Cornell University Energy Recovery Linac (ERL) photoinjector has recently demonstrated operation at 20 mA for approximately 8 hours, utilizing a multialkali photocathode deposited on a Si substrate. We describe the recipe for photocathode deposition, and will detail the parameters of the run. Post-run analysis of the photocathode indicates the presence of significant damage to the substrate, perhaps due to ion back-bombardment from the residual beamline gas. While the exact cause of the substrate damage remains unknown, we describe multiple surface characterization techniques (X-ray fluorescence spectroscopy, X-ray diffraction, atomic force and scanning electron microscopy) used to study the interesting morphological and crystallographic features of the photocathode surface after its use for high current beam production. Finally, we present a simple model of crystal damage due to ion back-bombardment, which agrees qualitatively with the distribution of damage on the substrate surface.Comment: 20 pages, 15 figure

Cool, Terrill A.

Also available as a printed booklet and from the Dean of Faculty website https://theuniversityfaculty.cornell.edu/Memorial Statement for Terrill A. Cool , who died in 2012. The memorial statements contained herein were prepared by the Office of the Dean of the University Faculty of Cornell University to honor its faculty for their service to the university

Cady, K. Bingham

Also available as a printed booklet and from the Dean of Faculty website https://theuniversityfaculty.cornell.edu/Memorial Statement for K. Bingham Cady, who died in 2020. The memorial statements contained herein were prepared by the Office of the Dean of the University Faculty of Cornell University to honor its faculty for their service to the university

Engineering: Cornell Quarterly, Vol.26, No.3 (Spring 1992): The Diversity of Nuclear Science and Engineering

IN THIS ISSUE: The Nuclear Frontier: Cornell's Program of Basic and Applied Research /2 (The Program in Nuclear Science and Engineering has deep roots and broad scope.) ... Neutron Activation Analysis: A Sensitive Test for Trace Elements /7 (A simple analytical technique is used for research in many different disciplines.) ... Holding a Bit of the Sun: Progress toward Inertial Confinement Fusion /12 (Steady, careful work leads toward a vast source of energy for the future.) Safe Nuclear Power: Better Design and Simulation /22 (Diminish the Liabilities A new generation of reactors and a new way to run them make nuclear power the best energy option.) ... Atomic Processes in Ionized Matter /28 (The electron-beam ion source makes possible fundamental research into processes that take place in plasmas.) ... Neutron Radiography: Key to Secrets That X-Rays Can't See /34 ... Chips in Space: Developing Microelectronic Structures that Tolerate Ionizing Radiation /39 (Electronic components used in space must be able to withstand massive doses of radiation.) ... Building a Cold Neutron Beam: A Pure Dream Becomes Reality /44 (A facility that will deliver a beam of relatively pure, cold neutrons from Cornell's TRIGA reactor is nearing completion. ... Faculty Publications /5