FEL2010 - List of Authors (Andrews, H.L.)

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Andrews, H.L.

Paper	Title	Page
TUPA08	Ultra-Compact Smith-Purcell Free-Electron Laser	230
	J.D. Jarvis, C.A. Brau, J.L. Davidson, B.L. Ivanov, J.L. Kohler Vanderbilt University, Nashville, TN H.L. Andrews LANL, Los Alamos, New Mexico
	Recently, the theory of the Smith-Purcell free-electron laser has been confirmed by the experiments of Andrews, et al. [1], and of Gardelle, et al. [2] In addition, high-brightness cathodes have been developed using field-emission from arrays of diamond pyramids [3]. By combining these developments we have designed an ultracompact (“shirt-pocket”) free-electron laser and we have begun constructing the device. The electron beam comprises an array of 2-micron diamond-pyramid field emitters that overfills an einzel lens 200-microns wide and 1-mm long, fabricated using ps-laser machining. The beam is accelerated to 10 keV and focused in the short dimension over a lamellar metal grating with a period of 150 microns and a length of 10 mm. The predicted start current at a wavelength of {10}84 microns is 11 mA, which corresponds to 9 A/cm² at the cathode, before focusing. We have tested cathodes at 30 A/cm² and 600 mA total current; higher current density should be possible. [1] Andrews, et al, JAP {10}5, 024904 (2009) [2] Andrews, et al, PRST-AB 12, 080703 (2009) [3] Gardelle, et al, PRST-AB 12, 110701 (2009) [4] Jarvis, et al, JVSTB 27, 2264 (2009) [5] Jarvis, Thesis, 2009

Paper

Title

Page

TUPA08

Ultra-Compact Smith-Purcell Free-Electron Laser

230

J.D. Jarvis, C.A. Brau, J.L. Davidson, B.L. Ivanov, J.L. Kohler
Vanderbilt University, Nashville, TN
H.L. Andrews
LANL, Los Alamos, New Mexico

Recently, the theory of the Smith-Purcell free-electron laser has been confirmed by the experiments of Andrews, et al. [1], and of Gardelle, et al. [2] In addition, high-brightness cathodes have been developed using field-emission from arrays of diamond pyramids [3]. By combining these developments we have designed an ultracompact (“shirt-pocket”) free-electron laser and we have begun constructing the device. The electron beam comprises an array of 2-micron diamond-pyramid field emitters that overfills an einzel lens 200-microns wide and 1-mm long, fabricated using ps-laser machining. The beam is accelerated to 10 keV and focused in the short dimension over a lamellar metal grating with a period of 150 microns and a length of 10 mm. The predicted start current at a wavelength of {10}84 microns is 11 mA, which corresponds to 9 A/cm² at the cathode, before focusing. We have tested cathodes at 30 A/cm² and 600 mA total current; higher current density should be possible.

[1] Andrews, et al, JAP {10}5, 024904 (2009)
[2] Andrews, et al, PRST-AB 12, 080703 (2009)
[3] Gardelle, et al, PRST-AB 12, 110701 (2009)
[4] Jarvis, et al, JVSTB 27, 2264 (2009)
[5] Jarvis, Thesis, 2009