John W. Lewellen
Los Alamos National Laboratory
148 Papers
909 Citations
John W. Lewellen is an academic researcher from Los Alamos National Laboratory. The author has contributed to research in topics: Beam (structure) & Electron gun. The author has an hindex of 21, co-authored 143 publications. Previous affiliations of John W. Lewellen include Argonne National Laboratory & ASML Holding.
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Papers
Patent
Method of uniformly coating a substrate
Emir Gurer,Tom Zhong,John W. Lewellen,Ed C. Lee,Robert P. Mandal,James C. Grambow,Ted C. Bettes,Donald R. Sauer,Edmond R. Ward +8 more
- 30 Jun 2001
TL;DR: In this paper, a method of and an apparatus for coating a substrate with a polymer solution to produce a film of uniform thickness, includes mounting the substrate inside an enclosed housing and passing a control gas, which may be a solvent vapor-bearing gas into the housing through an inlet.
93
Photocathodes for the energy recovery linacs
Triveni Rao,Andrew Burrill,Xiangyun Chang,John Smedley,Tomohiro Nishitani,C. Hernandez Garcia,M. Poelker,E.A. Seddon,F.E. Hannon,Charles Sinclair,John W. Lewellen,Donald W. Feldman +11 more
TL;DR: In this paper, an overview of existing and emerging technologies on electron sources that can service various energy recovering linacs under consideration Photocathodes that can deliver average currents from 1 mA to 1 A, the pros and cons associated with these cathodes are addressed status of emerging technologies such as secondary emitters, cesiated dispenser cathodes, field and photon assisted field emitters and super lattice photocathodes are also reviewed.
Generating a quasiellipsoidal electron beam by 3D laser-pulse shaping.
Yuelin Li,John W. Lewellen +1 more
TL;DR: Particle tracking simulations show that the electron beam initiated by such a laser pulse in a high-gradient radio-frequency photoinjector delivers very low emittance, ideal for beam-based light sources such as the x-ray free-electron laser.
48
Radiation-Belt Remediation Using Space-Based Antennas and Electron Beams
Bruce E. Carlsten,P. Colestock,Gregory S. Cunningham,Gian Luca Delzanno,E. E. Dors,Michael A. Holloway,Christopher A. Jeffery,John W. Lewellen,Quinn R. Marksteiner,Dinh C. Nguyen,Geoffrey D. Reeves,Kevin Shipman +11 more
TL;DR: In this article, the authors provide an overview of enhanced electron distributions in the radiation belts as well as approaches to VLF wave belt remediation including the use of either antennas or relativistic electrons beams in space to generate the very low frequency (VLF) waves.
47
Status of the Advanced Photon Source low-energy undulator test line
Stephen V. Milton,Efim Gluskin,Ned D. Arnold,Steven Berg,William Berg,Yong-Chul Chae,E. A. Crosbie,Roger J. Dejus,Patric Den Hartog,H. Friedsam,John Galayda,Arthur Grelick,Justin Jones,Y.W. Kang,Suk Hong Kim,John W. Lewellen,Alex H. Lumpkin,James R. Maines,Gregory M. Markovich,Elizabeth Moog,Ali Nassiri,Emil Trakhtenberg,Isaac Vasserman,Nikolai A. Vinokurov,Dean Walters,Ju Wang,Bingxin Yang +26 more
TL;DR: The Low-Energy Undulator Test Line (LEUTL) project at the Advanced Photon Source (APS) as discussed by the authors is a test line for the self-amplified spontaneous emission process at wavelengths down to a few tens of nanometers.