Search Results - "Dowell, David H."

Quantum efficiency and thermal emittance of metal photocathodes by Dowell, David H., Schmerge, John F.

“…Modern electron beams have demonstrated the brilliance needed to drive free electron lasers at x-ray wavelengths with major advances occurring since the…”
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Exact cancellation of emittance growth due to coupled transverse dynamics in solenoids and rf couplers by Dowell, David H., Zhou, Feng, Schmerge, John

“…Weak, rotated magnetic and radio frequency quadrupole fields in electron guns and injectors can couple the beam’s horizontal with vertical motion, introduce…”
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Topological cathodes: Controlling the space charge limit of electron emission using metamaterials by Dowell, David H.

“…The space charge limit (SCL) of emission from photocathodes sets an upper limit on the performance of both high- and low-field electron guns. Generally, one is…”
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Erratum: Quantum efficiency and thermal emittance of metal photocathodes [Phys. Rev. ST Accel. Beams 12 , 074201 (2009)] by Dowell, David H., Schmerge, John F.

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Experimental verification of the 3-step model of photoemission for energy spread and emittance measurements of copper and CsBr-coated copper photocathodes suitable for free electron laser applications by Maldonado, Juan R., Pianetta, Piero, Dowell, David H., Corbett, Jeff, Park, Sam, Schmerge, John, Trautwein, Ann, Clay, William

“…This paper presents measurements and analysis of the quantum efficiency (QE) and intrinsic emittance of Cu and CsBr coated Cu photocathodes. The data analysis…”
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Dielectric laser accelerators by England, R. Joel, Noble, Robert J., Bane, Karl, Dowell, David H., Ng, Cho-Kuen, Spencer, James E., Tantawi, Sami, Wu, Ziran, Byer, Robert L., Peralta, Edgar, Soong, Ken, Chang, Chia-Ming, Montazeri, Behnam, Wolf, Stephen J., Cowan, Benjamin, Dawson, Jay, Gai, Wei, Hommelhoff, Peter, Huang, Yen-Chieh, Jing, Chunguang, McGuinness, Christopher, Palmer, Robert B., Naranjo, Brian, Rosenzweig, James, Travish, Gil, Mizrahi, Amit, Schachter, Levi, Sears, Christopher, Werner, Gregory R., Yoder, Rodney B.

“…The use of lasers to accelerate particles in dielectric structures has become much more prominent of late, with recent exciting results of electron…”
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Dielectric laser accelerators by England, R. Joel, Noble, Robert J., Bane, Karl, Dowell, David H., Ng, Cho-Kuen, Spencer, James E., Tantawi, Sami, Wu, Ziran, Byer, Robert L., Peralta, Edgar, Soong, Ken, Chang, Chia-Ming, Montazeri, Behnam, Wolf, Stephen J., Cowan, Benjamin, Dawson, Jay, Gai, Wei, Hommelhoff, Peter, Huang, Yen-Chieh, Jing, Chunguang, McGuinness, Christopher, Palmer, Robert B., Naranjo, Brian, Rosenzweig, James, Travish, Gil, Mizrahi, Amit, Schachter, Levi, Sears, Christopher, Werner, Gregory R., Yoder, Rodney B.

“…The use of infrared lasers to power optical-scale lithographically fabricated particle accelerators is a developing area of research that has garnered…”
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Topological Cathodes: Controlling the Space Charge Limit of Electron Emission Using Metamaterials by Dowell, David H

“…Phys. Rev. Accel. Beams 22, 084201 (2019) The space charge limit (SCL) of emission from photocathodes sets an upper limit on the performance of both high- and…”
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Correcting Emittance Growth Due to Stray Sextupole Fields by Dowell, David H

“…This paper discusses the emittance growth produced by sextupole fields in conjunction with a solenoidal focusing. The sextupole emittance is derived and…”
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Sources of Emittance in RF Photocathode Injectors: Intrinsic emittance, space charge forces due to non-uniformities, RF and solenoid effects by Dowell, David H

“…Advances in electron beam technology have been central to creating the current generation of x-ray free electron lasers and ultra-fast electron microscopes…”
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Combining Particle Tracking with Electromagnetic Radiation Showers: Merging GPT and Geant4 with Visualization by Dowell, David H, Hindi, Munther, van der Geer, S. B, de Loos, M. J

“…Field emitted electrons can seriously affect the operation of high-field, high-duty factor electron accelerators. Accelerated field emission can result in high…”
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Cancellation of RF Coupler-Induced Emittance Due to Astigmatism by Dowell, David H

“…It is well-known that the electron beam quality required for applications such as FELs and ultra-fast electron diffraction can be degraded by the asymmetric…”
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The status of normal conducting RF (NCRF) guns, a summary of the ERL2005 workshop by Dowell, David H., Lewellen, John W., Nguyen, Dinh, Rimmer, Robert

“…The 32nd Advanced ICFA Beam Dynamics Workshop on Energy Recovering Linacs (ERL2005) was held at Jefferson Laboratory, March 20–23, 2005. A wide range of…”
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Exact Cancellation of Emittance Due to Coupled Transverse Dynamics in Solenoids and RF Couplers by Dowell, David H, Zhou, Feng, Schmerge, John

“…Phys. Rev. Accel. Beams 21, 010101 (2018) Small, stray magnetic and RF fields in electron guns and injectors can perturb an electron beam and introduce…”
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An Engineering Guide To Photoinjectors by Rao, Triveni, Dowell, David H

“…Since the discovery of electrons more than a century ago, the generation, transport and characterization of electron beams has been an active field of…”
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Permanent magnet systems for free-electron lasers by Gottschalk, Steve C., Dowell, David H., Quimby, David C.

“…We review uses of permanent magnets (PMs) in free-electron lasers (FELs). Recently, PMs have been considered to replace many of the electromagnet (EM) dipoles,…”
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Reduction of bend-plane emittance growth in a chicane pulse compressor by Dowell, David H.

“…Emittance preservation in beam bending systems is vitally important in the production of bright, high-current electron microbunches. Generally, the emittance…”
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PARMELA_B: a new version of PARMELA with coherent synchrotron radiation effects and a finite difference space charge routine by Koltenbah, Benjamin E.C., Parazzoli, Claudio G., Greegor, Robert B., Dowell, David H.

“…Recent interest in advanced laser light sources has stimulated development of accelerator systems of intermediate beam energy, 100–200 MeV, and high charge,…”
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Coupler Design for the LCLS Injector S-Band Structures by Zenghai Li, Jose Chan, Bentson, L.D., Dowell, D.H., Limborg-Deprey, C., Schmerge, J.F., Schultz, D.

“…The LCLS injector is required to provide a 1-nC, 10-ps bunch with a normalized rms transverse projected emittance of less than 1 micron. The LCLS beam is…”
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The Development of the Linac Coherent Light Source RF Gun by Dowell, David H, Jongewaard, Erik, Lewandowski, James, Limborg-Deprey, Cecile, Li, Zenghai, Schmerge, John, Vlieks, Arnold, Wang, Juwen, Xiao, Liling

“…The Linac Coherent Light Source (LCLS) is the first x-ray laser user facility based upon a free electron laser (FEL). In addition to many other stringent…”
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