FEL2010 - List of Authors (Feldman, D.W.)

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Feldman, D.W.

Paper	Title	Page
WEPB12	Cesium Emission in Dispenser Photocathodes	422
	E.J. Montgomery, D.W. Feldman, P.G. O'Shea UMD, College Park, Maryland J.R. Harris, J.C. Jimenez NPS, Monterey, California K. L. Jensen NRL, Washington, DC
	Photocathodes are a promising electron source for future high average current FELs, with ps response, kA/cm² peak and A/cm² average current, but will require delicate cesium-based coatings to achieve requisite quantum efficiency (QE). The UMD dispenser photocathode replenishes cesium from a subsurface reservoir, extending lifetime [1]. Recesiation has been shown to reverse oxidizer-induced QE loss [2]. Optimization of pore size and spacing will enable uniform recesiation without emitting excess cesium into the cavity. We here quantify for the first time cesium emission from active dispenser photocathodes and summarize status of experimental and modeling efforts. [1] N.A. Moody et.al., Appl. Phys. Lett. 90, 114108 (2007). [2] E.J. Montgomery et al., AIP Conf. Proc. {10}86, 599 (2009).

Paper

Title

Page

WEPB12

Cesium Emission in Dispenser Photocathodes

422

E.J. Montgomery, D.W. Feldman, P.G. O'Shea
UMD, College Park, Maryland
J.R. Harris, J.C. Jimenez
NPS, Monterey, California
K. L. Jensen
NRL, Washington, DC

Photocathodes are a promising electron source for future high average current FELs, with ps response, kA/cm² peak and A/cm² average current, but will require delicate cesium-based coatings to achieve requisite quantum efficiency (QE). The UMD dispenser photocathode replenishes cesium from a subsurface reservoir, extending lifetime [1]. Recesiation has been shown to reverse oxidizer-induced QE loss [2]. Optimization of pore size and spacing will enable uniform recesiation without emitting excess cesium into the cavity. We here quantify for the first time cesium emission from active dispenser photocathodes and summarize status of experimental and modeling efforts.

[1] N.A. Moody et.al., Appl. Phys. Lett. 90, 114108 (2007).
[2] E.J. Montgomery et al., AIP Conf. Proc. {10}86, 599 (2009).