D
David H. Dowell
Researcher at SLAC National Accelerator Laboratory
Publications - 58
Citations - 4131
David H. Dowell is an academic researcher from SLAC National Accelerator Laboratory. The author has contributed to research in topics: Thermal emittance & Free-electron laser. The author has an hindex of 16, co-authored 56 publications receiving 3750 citations. Previous affiliations of David H. Dowell include Stanford University & Los Alamos National Laboratory.
Papers
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Journal ArticleDOI
First lasing and operation of an ångstrom-wavelength free-electron laser
Paul Emma,R. Akre,J. Arthur,Richard M. Bionta,Christoph Bostedt,John D. Bozek,Axel Brachmann,Philip H. Bucksbaum,Ryan Coffee,F.-J. Decker,Y. Ding,David H. Dowell,S. A. Edstrom,Alan Fisher,Josef Frisch,Sasha Gilevich,Jerome B. Hastings,G. Hays,Ph. Hering,Zhirong Huang,R. H. Iverson,Henrik Loos,Marc Messerschmidt,A. Miahnahri,Stefan Moeller,Heinz-Dieter Nuhn,G. Pile,Daniel Ratner,J. Rzepiela,D. Schultz,T. Smith,P. Stefan,H. Tompkins,Joshua J. Turner,J. Welch,William E. White,Juhao Wu,Gerald Yocky,J. Galayda +38 more
TL;DR: The Linac Coherent Light Source free-electron laser has achieved coherent X-ray generation down to a wavelength of 1.2 A and at a brightness that is nearly ten orders of magnitude higher than conventional synchrotrons.
Journal ArticleDOI
Cathode R&D for future light sources
David H. Dowell,Ivan Bazarov,Bruce Dunham,Katherine Harkay,Carlos Hernandez-Garcia,R. Legg,Howard A. Padmore,Triveni Rao,John Smedley,Weishi Wan +9 more
TL;DR: In this paper, the requirements and current status of cathodes for accelerator applications are reviewed and a research and development plan for advancing cathode technology is proposed, and the thermal emittance is derived and formulas used to compare the various cathode materials.
Journal ArticleDOI
Measurements and Simulations of Ultralow Emittance and Ultrashort Electron Beams in the Linac Coherent Light Source
Y. Ding,Axel Brachmann,F.-J. Decker,David H. Dowell,Paul Emma,Josef Frisch,Sasha Gilevich,G. Hays,Ph. Hering,Zhirong Huang,R. H. Iverson,Henrik Loos,A. Miahnahri,Heinz-Dieter Nuhn,Daniel Ratner,Joshua J. Turner,J. Welch,William E. White,Jihuai Wu +18 more
TL;DR: Very low-emittance measurements made at low bunch charge, and a few femtosecond bunch length produced by the LCLS bunch compressors, show the possibilities of generating hundreds of GW at 1.5 A x-ray wavelength and nearly a single longitudinally coherent spike at 2-fs duration.
Journal ArticleDOI
The Quantum Efficiency and Thermal Emittance of Metal Photocathodes
David H. Dowell,John Schmerge +1 more
TL;DR: In this article, the relationship between the quantum efficiency and the thermal emittance for metal cathodes using the Fermi-Dirac model for the electron distribution was investigated, and a consistent theory was derived to derive the quantum and thermal efficiency.
Journal ArticleDOI
Measurements of the linac coherent light source laser heater and its impact on the x-ray free-electron laser performance
Zhirong Huang,Axel Brachmann,F.-J. Decker,Y. Ding,David H. Dowell,Paul Emma,Josef Frisch,Sasha Gilevich,G. Hays,Ph. Hering,R. H. Iverson,Henrik Loos,A. Miahnahri,Heinz-Dieter Nuhn,Daniel Ratner,Gennady Stupakov,Joshua J. Turner,J. Welch,William E. White,Juhao Wu,Dao Xiang +20 more
TL;DR: In this article, a laser-heater system has been installed in the linac coherent light source (LCLS), which modulates the energy of a 135-MeV electron bunch with an IR-laser beam in a short undulator, enclosed within a four-dipole chicane.