High quantum efficiency photocathode simulation for the investigation of novel structured designs

Y P Opachich; P W Ross; A G MacPhee; T J Hilsabeck; S R Nagel; E Huffman; P M Bell; D K Bradley; J A Koch; O L Landen

doi:10.1063/1.4893942

High quantum efficiency photocathode simulation for the investigation of novel structured designs

Rev Sci Instrum. 2014 Nov;85(11):11D625. doi: 10.1063/1.4893942.

Authors

Y P Opachich¹, P W Ross¹, A G MacPhee², T J Hilsabeck³, S R Nagel², E Huffman¹, P M Bell², D K Bradley², J A Koch¹, O L Landen²

Affiliations

¹ National Security Technologies LLC, Livermore, California 94550, USA.
² Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
³ General Atomics, San Diego, California 92121, USA.

PMID: 25430201
DOI: 10.1063/1.4893942

Abstract

A computer model in CST Studio Suite has been developed to evaluate several novel geometrically enhanced photocathode designs. This work was aimed at identifying a structure that would increase the total electron yield by a factor of two or greater in the 1-30 keV range. The modeling software was used to simulate the electric field and generate particle tracking for several potential structures. The final photocathode structure has been tailored to meet a set of detector performance requirements, namely, a spatial resolution of <40 μm and a temporal spread of 1-10 ps. We present the details of the geometrically enhanced photocathode model and resulting static field and electron emission characteristics.