Staff Scientist, LOASIS program of LBNL.

Cameron Geddes obtained a B.A. degree in physics from Swarthmore College in 1997, and received the American Physical Society Apker Award for the outstanding undergraduate thesis that year for work on equilibria of Spheromak plasmas. From 1997 through 1999 he was a physicist at Lawrence Livermore National Laboratory and from 1999-2000 at Polymath Research working in the laser plasma interactions program.

He received the Ph.D. in 2005 (following the M.A. in 2003) from the University of California Berkeley, where he was supported by the Hertz fellowship and the National Defense Science & Engineering Fellowship. His thesis comprised experimental development and particle in cell simulations of the first plasma guiding of a relativistically intense laser pulse, and the resultant production of a high quality electron beam for the first time from a high gradient laser wakefield accelerator. He received the Hertz foundation thesis prize in 2005, as well as the American Physical Society Rosenbluth Award in 2006, for the outstanding doctoral dissertation.

He joined in the LOASIS program of Lawrence Berkeley National Laboratory in 2000 for his Ph.D. research and is presently a staff scientist in the group. He has twice received the LBNL outstanding performance award, once for his thesis research, and again for experiments on long scale guiding and GeV laser acceleration in capillary waveguides.

He is presently pursuing research on laser acceleration and high energy density matter, with principal foci on controlled guiding of intense laser pulses in plasmas and controlled injection of particles into laser wakefield accelerators. These projects are directed towards stabilizing the beams produced in laser accelerators, building on our recent demonstration of low energy spread beams to produce reliable high quality next generation accelerators. Recent experiments have demonstrated controlled injection of electrons into the laser accelerator structure by using a tapered plasma density or 'downramp', resulting in reproducibile bunches with very low absolute momentum spread. Other experiments are investigating injection using counter-propagating laser pulses (see for instance Esarey, PRL v.79 no.14 pp.2682-2685). Experiments on controlled guiding are being continued to stabilize laser propagation and hence generate a repeatable accelerating structure. Recent experiments on long scale length guiding in capillary channels have accelerated electrons to GeV energies in 3 cm. Together, control of accelerating structure and injection offer a path to reproducible high quality electron bunches.

Particle in cell simulations are conducted in parallel with experiments to guide and assist in understanding the experiments, as well as to further understanding of the importance of numerical parameters to simulation results. These simulations were supported by an INCITE grant of 2.5 million hours from the Department of Energy for 2006. This grant and continued large scale allocations in 2007-8 are allowing realistic modeling in two and three dimensions to optimize laser accelerators.

His general research interests include intense laser interactions with plasmas for laser driven advanced particle accelerators and radiation sources as well as fusion. Other interests include plasma simulations, nonlinear optics, magnetized plasmas, gas dynamics and nozzle flows.

Further information is available at the LOASIS program website, and my page there. A CV is also available. Listed below are selected papers, selected popular articles and news, dissertations and other work, invited talks, and other papers.

C.G.R. Geddes, K. Nakamura, G.R. Plateau, Cs. Toth, E. Cormier-Michel, E. Esarey, C.B. Schroeder, J.R. Cary, and W.P. Leemans, "Stable low momentum spread electron bunches from plasma density gradient injection," PRL V 100, 215004 (2008). LBNL-1232E [geddes plasma downramp injection prl 2008.pdf], also included in Virtual Journal of Ultrafast Science V. 6..

C.G.R. Geddes, D.L. Bruhwiler, J.R. Cary, W.B. Mori, J-L. Vay, S.F. Martins, T. Katsouleas, E. Cormier-Michel, W.M. Fawley, C. Huang, X. Wang, B. Cowan, V.K. Decyk, E. Esarey, R.A. Fonseca, W. Lu, P. Messmer, P. Mullowney, K. Nakamura, K. Paul, G.R. Plateau, C.B. Schroeder, L.O. Silva, Cs. Toth, F.S. Tsung, M. Tzoufras, T. Antonsen, J. Vieira and W.P. Leemans, 'Computational studies and optimization of wakefield accelerators,' J. Phys. Conf. Series V 125 pp. 12002/1-11 (2008).LBNL-2245E. [Geddes wakefield accelerator simulation SciDAC2008.pdf]

E. Michel, B.A. Shadwick, C.G.R. Geddes, E. Esarey, C.B. Schroeder, and W.P. Leemans , "Unphysical kinetic effects in laser wakefield accelerators modeled with particle-in-cell codes," Phys. Rev. E. V 78, 016404 (2008). LBNL-63071. [Michel, Geddes Kinetic effects in PIC PRE 2008.pdf]

G. Plateau, E. Esarey, C.G.R. Geddes, W.P. Leemans, N.Matlis, C.B. Schroeder, J. van Tilborg, Cs. Toth, "Recent Progress at LBNL on Characterization of Laser Wakefield Accelerated Electron Bunches using Coherent Transition Radiation", Proc. Particle Accel Conference, Albuquerque NM, pp.2981-3 (2007). LBNL-63273. [Plateau,Geddes downramp injection THz PAC 2007.pdf]

C.G.R. Geddes, D. Bruhwiler, J.R. Cary, E. Cormier-Michel, E. Esarey, C.B. Schroeder, W.A. Isaacs, N. Stinus, P. Messmer, A. Hakim, K. Nakamura, A.J. Gonsalves, D. Panasenko, G.R. Plateau, Cs. Toth, B. Nagler, J. van Tilborg, T. Cowan, S.M. Hooker and W.P. Leemans, "Laser wakefield simulations towards development of compact particle accelerators," J. Phys. Conf. Series V 78 pp. 12021/1-5 (2007).[Geddes laser wakefield simulation SciDAC2007.pdf]

K. Nakamura, B. Nagler, Cs. Toth, C. G. R. Geddes, C. B. Schroeder, E. Esarey, W. P. Leemans, A.J. Gonsalves, S.M. Hooker, "GeV electron beams from a centimeter-scale channel guided laser wakefield accelerator", Phys. Plasmas v 14, pp. 056708/1-8 (2007). LBNL-63078. [Nakamura, Geddes gev pop 2007.pdf]

W.P. Leemans, B. Nagler, A.J. Gonsalves, Cs. Toth, K. Nakamura,3, C.G.R. Geddes, E. Esarey, C.B. Schroeder, S.M. Hooker, "GeV electron beams from a centimetre-scale accelerator," Nature Physics, V 2, pp. 696-9 (2006). LBNL-60105. [leemans, geddes GeV capillary.pdf]

J. van Tilborg, C.B. Schroeder, C.V. Filip, Cs. Toth, C.G.R. Geddes, G. Fubiani, R. Huber, R.A. Kaindl, E. Esarey, W.P. Leemans. "Temporal characterization of femtosecond laser-plasma-accelerated electron bunches using terahertz radiation". Phys. Rev. Lett., V 96, no. 1, pp. 014801/1-4 (2006). LBNL-58351. [vanTilborg,Geddes THz PRL 2006.pdf ]

W.B. Mori, F.S. Tsung, C. Huang, M. Zhou, W. Lu, M. Tzoufras, V.K. Decyk, D.L. Bruhwiler, J.R. Cary, P. Messmer, D.A. Dimitrov, C. Nieter, T. Katsouleas, S. Deng, A. Ghalam, E.H. Esarey, C.G.R. Geddes, J.H. Cooley, T.M. Jr. Antonsen, "Advanced accelerator simulation research: miniaturizing accelerators from kilometers to meters," Journal of Physics: Conference Series, V 16, no. 1, pp. 184-94 (2005). LBNL-61228. [ Mori, Geddes Adv Accel JCP 05.pdf ]

C.G.R. Geddes, Cs. Toth, J. van Tilborg, E. Esarey, C.B. Schroeder, J. Cary , W.P. Leemans, "Guiding of Relativistic Laser Pulses by Preformed Plasma Channels," Phys. Rev. Lett., V 95, no. 14, pp. 145002/1-4 (2005). LBNL-57058.[ Geddes guiding PRL2005.pdf ]

W.P. Leemans, E. Esarey, J. van Tilborg, P.A. Michel, C.B. Schroeder, C. Toth, C.G.R. Geddes, B.A. Shadwick, "Radiation from Laser Accelerated Electron Bunches: Coherent Terahertz and Femtosecond X-Rays," IEEE Trans. Plasma Sci., vol. 33, no. 1, pp. 8-22 (2005). LBNL-56584. [ Leemans, Geddes radiation TPS2005.pdf ]

C.G.R. Geddes, Cs. Toth, J. van Tilborg, E. Esarey, C.B. Schroeder, D. Bruhwiler, C. Nieter, J. Cary, W.P. Leemans, "Production of high quality electron bunches by dephasing and beam loading in channeled and unchanneled laser plasma accelerators," Physics of Plasmas, V 12, pp. 056709/1-10 (2005). LBNL-57062. [ Geddes dephasing PoP2005.pdf ]

C.G.R. Geddes, Cs. Toth, J. van Tilborg, E. Esarey, C.B. Schroeder, D. Bruhwiler, C. Nieter, J. Cary, W.P. Leemans, "High-quality electron beams from a laser wakefield accelerator using plasma-channel guiding," Nature, V 438, pp. 538-41 (2004). LBNL-55732. [ Geddes Guided Accel Nature 2004.pdf ]

W.P. Leemans, J. van Tilborg, J. Faure, C.G.R. Geddes, Cs. Toth, C.B. Schroeder, E. Esarey, G. Fubiani, and G. Dugan, "Terahertz radiation from laser accelerated electron bunches", Phys. Plasmas V 5, pp. 2899-2906 (2004). LBNL-54258.[Leemans, Geddes THz PoP 2004.pdf]

C.G.R. Geddes, R.K. Kirkwood, S.H.Glenzer, K.G. Estabrook, C. Joshi, K.B. Wharton, "Observation of ion wave decay products of Langmuir waves generated by stimulated Raman scattering in ignition scale plasmas," Physics of Plasmas, V 10, no. 8, pp.3422-25 (2003). [ Geddes LDI PoP 2003.pdf ]

W.P.Leemans, J.van Tilborg, J. Faure, C.G.R. Geddes, Cs. Toth, C.B. Schroeder, E. Esarey, and G. Fubiani, "Observation of terahertz emission from a laser-plasma accelerated electron bunch crossing a plasma-vacuum boundary," Physical Review Letters, V 91, no. 7, pp.074802/1-4 (2003). LBNL-52554. [ Leemans,Geddes THz PRL 2003.pdf ]

R.K. Kirkwood, R.L. Berger, C.G.R. Geddes, J.D. Moody, B.J. MacGowan, S.H. Glenzer, K.G. Estabrook, C. Decker, and O.L. Landen, "Scaling of saturated stimulated Raman scattering with temperature and intensity in ignition scale plasmas," Physics of Plasmas, V 10, no. 7, pp.2948-55 (2003). [ Kirkwood,Geddes SRS scale PoP2003.pdf ]

C.B. Schroeder, E. Esarey, C.G.R. Geddes, Cs. Toth, B.A. Shadwick, J. van Tilborg, J. Faure, and W.P. Leemans, "Frequency chirp and pulse shape effects in self-modulated laser wakefield accelerators," Physics of Plasmas, V 10, no. 5, pp. 2039-46 (2003). LBNL-52176. [ Schroeder,Geddes Chirp PoP 2003.pdf ]

Cs. Toth, J. Faure, J. van Tilborg, C.G.R. Geddes, C.B. Schroeder, E. Esarey, W.P. Leemans. "Tuning of laser pulse shapes in grating based compressors for optimal electron acceleration in plasmas," Optics Letters, V 28, no. 19, pp. 1823-1825 (2003). LBNL-52178. [ Toth, Geddes pulseshapes OL 2003.pdf ]

C.G.R. Geddes, P.E. Catravas, J. Faure, C. Toth, J. VanTilborg, W.P. Leemans, "Accelerator optimization using a network control and acquisition system," AIP Conference Proceedings, no.647- Proc. Advanced Accelerator Concepts Workshop, pp. 796-801 (2002). LBNL-51577. [ Geddes Control System AAC 2002.pdf ]

Cs. Toth, J. Faure, J. van Tilborg, C. G. R. Geddes, C. B. Schroeder, E. Esarey, and W. P. Leemans, "Shape-control of ultrashort laser pulses for optimal electron acceleration in plasmas," AIP Conference Proceedings, no.647- Proc. Advanced Accelerator Concepts Workshop, pp. 674-80 (2002). LBNL-51578. [ Toth,Geddes Pulseshape AAC 2002.pdf ]

Cs. Toth, J. de Groot, J. van Tilburg, C.G.R. Geddes, J. Faure, P. Catravas, C.B. Schroeder, B.A. Shadwick, E. Esarey, W.P. Leemans, "Evolution of pulse shapes during a conventional compressor scan in a chirped pulse amplification (CPA) system and its effect on electron acceleration in plasmas," Thirteenth International Conference on Ultrafast Phenomena, Technical Digest (TOPS Vol.72), Opt. Soc. America. pp. 64-5 (2002). LBNL-52183. [ Toth, Geddes pulseshapes UF2002.pdf ]

W.P. Leemans, P. Catravas, E. Esarey, C.G.R. Geddes, C. Toth, R. Trines, C.B. Schroeder, B.A. Shadwick, J. van Tilborg, J. Faure, "Electron-yield enhancement in a Laser-Wakefield accelerator driven by asymmetric laser pulses," Physical Review Letters, V 89, no. 17, pp.174802/1-4 (2002). LBNL-49856. [ Leemans, Geddes Pulseshapes PRL 2002.pdf ]

W.P. Leemans, P. Catravas, E. Esarey, C.G.R. Geddes, C. Toth, R. Trines, C.B. Schroeder, B.A. Shadwick, J. van Tilborg, J. Faure, "Electron-yield enhancement in a laser-wakefield accelerator driven by asymmetric laser pulses," Physical Review Special Topics-Accelerators & Beams, V 5, no. 10 (2002). [PRST-AB]

W.P. Leemans, D. Rodgers, P.E. Catravas, C.G.R. Geddes, G. Fubiani, C. Toth, E. Esarey, B.A. Shadwick, R. Donahue, A. Smith, A. Reitsma, "Radio-isotope production using laser wakefield accelerators," Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268). IEEE. Part vol.1, pp. 129-31 (2001). LBNL-49862. [ Leemans, Geddes Radioisotopes PAC 2001.pdf ]

W. P. Leemans, D. Rodgers, P. E. Catravas, C.G.R. Geddes, G. Fubiani, E. Esarey, B. A. Shadwick, R. Donahue, and A. Smith, "Gamma-neutron activation experiments using laser wakefield accelerators," Physics of Plasmas, V 8, no. 5, pp. 2510-16 (2001). LBNL-47540. [ Leemans,Geddes Activation PoP 2001.pdf ]

W.P. Leemans, D. Rodgers, P.E. Catravas, G. Fubiani, C.G.R. Geddes, E. Esarey, B.A. Shadwick, G.J.H. Brussaard, J. van Tilborg, S. Chattopadhyay, J.S. Wurtele, L. Archambault, M.R. Dickinson, S. DiMaggio, R. Short, K.L. Barat, R. Donahue, J. Floyd, A. Smith, E. Wong, "Laser wakefield accelerator experiments at LBNL," AIP Conference Proceedings, no.569- Proc. Advanced Accelerator Concepts Workshop, pp. 136-45 (2001). [ Leemans, Geddes wakefield AAC 2000.pdf ]

S. H. Glenzer, L. M. Divol, R. L. Berger, C.G.R. Geddes, R. K. Kirkwood, J. D. Moody, E. A. Williams, and P. E. Young "Thomson scattering measurements of saturated ion waves in laser fusion plasmas," Physical Review Letters, V 86, no. 12, pp. 2565-8 (2001). [ Glenzer,Geddes TS ion PRL 2001.pdf ]

C.G.R. Geddes, T.W. Kornack, M.R. Brown, "Scaling studies of spheromak formation and equilibrium," Physics of Plasmas, V 5, no. 4, pp. 1027-34 (1998). [ Geddes,Brown Spheromak PoP 1998.pdf ]

C.G.R. Geddes, A.U. Tran, G. Chong, L.A. Molter, M. Dutta, "Nonlinear Optical Slab Waveguide Devices in AlGaAs/GaAs," Proceedings of the Conference on Lasers and Electro Optics, Baltimore MD, (IEEE Cat. No. 95CH35800). Opt. Soc. America. pp.100-1 (1995).

"Simulations explain high energy density experiments", LLNL S&T review Jen/Feb 2009

NERSC and CRD Help Decipher Science from Compact Accelerator Simulations," CRD Newsletter 2009

W.P. Leemans, C.G.R. Geddes, and E. Esarey, "Light Accelerators", SPIE's oe magazine 5, 22-24 (2005).

C.G.R. Geddes, BA Thesis, 1997, Swarthmore College, "Spheromak Equilibriun Studies on SSX" [Geddes Spheromak BA Thesis 1997.pdf]

C.G.R. Geddes, "Laser wakefield accelerator physics and development," HEDSA meeting at APS DPP, Dallas TX, November 2008 []

C.G.R. Geddes, "Laser Acceleration: Guiding and Injection," Advanced Accelerator Concepts Workshop, Santa Cruz CA, July 2008 []

C.G.R. Geddes, "Computational Studies and Optimization of wakefield accelerators," SciDAC Conference, Seattle WA, July 2008 []

C.G.R. Geddes, "Large scale particle simulations of laser wakefield experiments," Laser Plasma Accelerator Workshop, Azores, June 2007 []

C.G.R. Geddes, ﾒDeveloping high energy, stable laser wakefield accelerators: particle simulations and experiments," Division of plasma physics, 2006 (Rosenbluth award talk).

C.G.R. Geddes, "Wakefield Accelerators for Ultrafast Particle and Radiation Sources Using Ultrashort-Pulse Lasers," Anomalous Absorption Conference, Jackson WY, June 2006[]

C.G.R. Geddes, "Laser Guiding at Relativistic Intensities and Wakefield Particle Acceleration in Plasma Channels," Conference on Lasers and Electro Optics, Baltimore MD, May 2005. []

C.G.R. Geddes, Particle Accelerator Conference, Knoxville TN, May 2005. []

C.G.R. Geddes, "High quality electron bunches from a plasma channel guided laser wakefield accelerator", Japan-US Workshop on High Irradiance Lasers, Osaka Japan, December 2004. []

C.G.R. Geddes, "High quality electron bunches from a plasma channel guided laser wakefield accelerator," APS Division of Plasma Physics, Savannah GA, November 2004. []

C.G.R. Geddes, "Nuclear activation experiments using laser wakefield accelerators," Workshop on Targetry and Target Chemistry (WTTC), Madison WI, August 2004. []

C.G.R. Geddes, "Laser Guiding At Relativistic Intensities and Wake Field Particle Acceleration in Plasma Channels," Proc. Advanced Accelerator Concepts Workshop, June 2004. []

C.G.R. Geddes, "Spheromak Equilibrium Studies on the Swarthmore Spheromak Experiment," APS Joint Meeting, Columbus OH, April 1998. []

J.-L. Vay, D. L. Bruhwiler, C. G. R. Geddes, W. M. Fawley, S. F. Martins, J. R. Cary, E. Cormier-Michel, B. Cowan, R. A. Fonseca, M. A. Furman, W. Lu, W. B. Mori, L. O. Silva "Simulating relativistic beam and plasma systems using an optimal boosting frame," In Journal of Physics Conference Series, Proceedings of SciDAC 2009. LBNL-2201E. [Vay, Geddes etal, Boosted Frame Simulation JCP 2009.pdf]

E. W. Bethel, C. Johnson, S. Ahern, J. Bell, P.-T. Bremer, H. Childs, E. Cormier-Michel, M. Day, E. Deines, T. Fogal, C. Garth, C. G. R. Geddes, H. Hagen, B. Hamann, C. Hansen, J. Jacobsen, K. Joy, J. Kr殀er, J. Meredith, P. Messmer, G. Ostrouchov, V. Pascucci, K. Potter, Prabhat, D. Pugmire, O. R歟el, A. Sanderson, C. Silva, D. Ushizima, G. Weber, B. Whitlock, K. Wu. "Occam's Razor and Petascale Visual Data Analysis." In Journal of Physics Conference Series, Proceedings of SciDAC 2009. [Bethel, Geddes Visual Analysis JCP 2009]

K. Wu, S. Ahern, E. W. Bethel, J. Chen, H. Childs, E. Cormier-Michel, C. Geddes, J. Gu, H. Hagen, B. Hamann, W. Koegler, J. Lauret, J. Meredith, P. Messmer, E. Otoo, V. Perevoztchikov, A. Poskanzer, Prabhat, O. R歟el, A. Shoshani, A. Sim, K. Stockinger, G. Weber, W.-M. Zhang. "FastBit: Interactively Searching Massive Data." In Journal of Physics Conference Series, Proceedings of SciDAC 2009. LBNL-2164E. [Wu, Geddes etal FastBit JCP 2009.pdf]

W.P. Leemans, E. Esarey, C. G. R. Geddes, Cs Toth, C. B. Schroeder, K. Nakamura, A. J. Gonsalves, D. Panasenko, E. Cormier-Michel, G. R. Plateau, "Progress on laser plasma accelerator development using transversely and longitudinally shaped plasmas," Comptes Rendus Physique, Vol. 10, No. 2-3. (March 2009), pp. 130-139.

O. Rubel, Prabhat, K. Wu, H. Childs, J. Meredith, C.G.R. Geddes, E. Cormier-Michel, S. Ahern, G.H. Weber, P. Messmer, H. Hagen, B. Hamann and E.W. Bethel, "Application of High-performance Visual Analysis Methods to Laser Wakefield Particle Acceleration Data." IEEE Visualization 2008, Columbus, Ohio, October 19-24, 2008. LBNL-952E. [Rubel Geddes Visual Analysis LWFA IEEEVis09.pdf]

C.G.R. Geddes, E. Cormier-Michel, E. Esarey, K. Nakamura, G.R. Plateau, C.B. Schroeder, Cs. Toth, D.L. Bruhwiler, J.R. Cary, W.P. Leemans, "Plasma gradient controlled injection and postacceleration of high quality electron bunches," Proc. Advanced Accelerator Concepts Workshop 2008, pp. 12. LBNL-2317E. [geddes plasma downramp,postaccel,simulations aac 2008.pdf]

C.B. Schroeder, E. Esarey, C.G.R. Geddes, Cs. T葉h and W.P. Leemans, "Design considerations for a laser-plasma linear collider," Proc. Advanced Accelerator Concepts Workshop 2008, pp. 208. [Schroeder, Geddes LPLC AAC2008.pdf]

E. Cormier-Michel, C.G.R. Geddes, E. Esarey, C.B. Schroeder, Cs. Toth, D.L. Bruhwiler,K. Paul, B. Cowan, W.P. Leemans, "Scaled simulations of a 10GeV accelerator," Proc. Advanced Accelerator Concepts Workshop 2008, pp. 297. LBNL-2203E. [Michel Geddes scaled simulation of 10 GeV AAC 2008.pdf]

K. Paul, D.L. Bruhwiler, B. Cowan, J.R. Cary, C. Huang, F.S. Tsung, W.B. Mori, E. Cormier-Michel, C.G.R. Geddes, E. Esarey, S. Martins, R.A. Fonseca and L.O. Silva, "Benchmarking the codes VORPAL, OSIRIS and QuickPIC with Laser Wakefield Acceleration Simulations," Proc. Advanced. Accel. Concepts Workshop (2008). LBNL-2293E. [Paul, Geddes Benchmarking AAC08.pdf]

D. Panasenko, A. J. Shu, C. B. Schroeder, A. J. Gonsalves, K. Nakamura, N. H. Matlis, E. Cormier-Michel, G. Plateau, C. Lin, C. Toth, C. G. R. Geddes, E. Esarey and W. P. Leemans, "Staging Laser Plasma Accelerators for Increased Beam Energy," Proc. Advanced Accelerator Concepts Workshop 2008, pp. 215. LBNL-Submitted. [Panasenko, Geddes staging LWFAs AAC2008.pdf]

G.R. Plateau,N.H. Matlis, O.Albert, C.T葉h, C.G.R.Geddes, C.B.Schroeder, J.vanTilborg, E.Esarey, and W.P. Leemans, "Optimization of THz Radiation Generation from a Laser Wakefield Accelerator," Proc. Advanced Accelerator Concepts Workshop 2008, pp. 713. [Plateau, Geddes THz optimization AAC2008.pdf]

N.H. Matlis, G.R. Plateau, J. van Tilborg, C.G.R. Geddes, Cs. T葉h, C.B. Schroeder, E. Esarey and W.P. Leemans, "High-Field, uJ-Class THz Pulses from a Laser Wakefield Accelerator," Proc. Advanced Accelerator Concepts Workshop 2008, pp. 707. [Matlis, Geddes microjoule THz AAC2008.pdf]

K. Nakamura, A.J. Gonsalves, D. Panasenko, C. Lin, Cs. T葉h, C.G.R. Geddes, C.B. Schroeder, E. Esarey and W.P. Leemans, "Analysis of Capillary Guided Laser Plasma Accelerator Experiments at LBNL," Proc. Advanced Accelerator Concepts Workshop 2008, pp. 707. LBNL-2029E. [Nakamura, Geddes Capillary LPA AAC 2008.pdf]

D.L. Bruhwiler, J.R. Cary, B. Cowan, K. Paul, C.G.R. Geddes, P. Mullowney, P. Messmer, E. Esarey, E. Cormier-Michel, W.P. Leemans, J.-L. Vay, "New Developments in the Simulation of Advanced Accelerator Concepts," Proc. Advanced. Accel. Concepts Workshop (2008) pp. 29. LBNL-2263E. [Bruhwiler, Geddes simulation developments AAC2008.pdf]

B. Cowan , D. Bruhwiler , E. Cormier-Michel, E. Esarey, C.G.R. Geddes, P. Messmer and K. Paul "Laser wakefield simulation using a speed-of-light frame envelope model," Proc. Advanced. Accel. Concepts Workshop (2008) pp. 307. LBNL-2278E. [Cowan, Geddes envelope simulations AAC08.pdf]

Cs. Toth, K. Nakamura, A. Gonsalves, D. Panasenko, N. Matlis, C. G. R. Geddes, C. B. Schroeder, E. Esarey, W. P. Leemans: 1 GeV Electron Beams from a Laser-Driven Channel-Guided Accelerator, CLEO/QELS 2008, San Jose, CA, May 4-9, 2008 (Invited). [Toth Geddes etal, GeV beams CLEO08.pdf]

O. Rubel, Prabhat, K. Wu, H. Childs, J. Meredith, C.G.R. Geddes, E. Cormier-Michel, S. Ahern, G.H. Weber, P. Messmer, H. Hagen, B. Hamann and E.W. Bethel, "High Performance Multivariate Visual Data Exploration for Extremely Large Data." SC08, Austin TX, November, 2008. LBNL-716E.[Rubel Geddes Visual Exploration of Data SC08.pdf]

D. M. Ushizima, O. Rubel, Prabhat, G.H. Weber, E.W. Bethel, C.R. Aragon, C.G.R. Geddes, E. Cormier-Michel, B. Hamann, P. Messmer, H. Hagen, "Automated analysis for detecting beams in laser wakefield simulations," Proc. ICMLA 2008. LBNL-960E.[Ushizima Geddes etal Automated bunch identification ICMLA08.pdf]

K. Ta Phuoc, E. Esarey, V. Leurent, E. Cormier-Michel, C. G. R. Geddes, C. B. Schroeder, A. Rousse, and W. P. Leemans, "Betatron radiation from density tailored plasmas," Phys. Plasmas V 15, 063102 (2008). LBNL-2292E. [phuoc geddes et al betatron radiation tailored plasmas PoP 2008.pdf]

D.A. Dimitrov, R.E. Giancone, D.L. Bruhwiler, R. Busby, J.R. Cary, C.G.R. Geddes, E. Esarey, W.P. Leemans, "Coupling of laser energy into plasma channels," Physics of Plasmas V 14, pp. 043105/1-14 (2007). LBNL-63723. [Dimitrov, Geddes channel coupling simulations PoP 2007.pdf]

J. van Tilborg, C. B. Schroeder, Cs. Toth, C. G. R. Geddes, E. Esarey, and W. P. Leemans, "Single-shot spatio-temporal measurements of high-field terahertz pulses," Optics Letters V 32 no. 3, pp. 313-315 (2007). LBNL-61983. [van Tilborg, Geddes THZ single shot optics letter 2007.pdf]

S.M. Hooker, E. Brunetti, E. Esarey, J.G. Gallacher, C.G.R. Geddes, A.J. Gonsalves, D.A. Jaroszynski, C. Kamperidis, S. Kneip, K. Krushelnick, W.P. Leemans, S.P.D. Mangles, C.D. Murphy, B. Nagler, Z. Najmudin, K. Nakamura, P.A. Norreys, D. Panasenko, T.P. Rowlands-Rees, C.B. Schroeder, Cs. Toth and R. Trines, "GeV plasma accelerators driven in waveguides," Plasma Physics and Controlled Fusion V 49 no. 12B, pp. B403-410, (2007). LBNL-63734. [Hooker, Geddes capillary PPCF2007.pdf]

J.R. Cary, P. Spentzouris, J. Amundson, L. McInnes, M. Borland, B. Mustapha, B. Norris, P. Ostroumov, Y. Wang, W. Fischer, A. Fedotov, I. Ben-Zvi, R. Ryne, E. Esarey, C. Geddes, J. Qiang, E. Ng, S. Li, C. Ng, R. Lee, L. Merminga, H. Wang, D.L. Bruhwiler, D. Dechow, P. Mullowney, P. Messmer, C. Nieter, S. Ovtchinnikov, K. Paul, P. Stoltz, D. Wade-Stein, W.B. Mori, V. Decyk, C.K. Huang, W. Lu, M. Tzoufras, F. Tsung, M. Zhou, G.R. Werner, T. Antonsen and T. Katsouleas, "COMPASS, the COMmunity petascale project for accelerator science and simulation, a broad computational accelerator physics initiative," J. Phys. Conf. Series V 78 pp. 12009/1-9 (2007). LBNL-63732. [Cary, Geddes COMPASS accelerator modeling SciDAC2007.pdf]

F.S. Tsung, T. Antonsen, D.L. Bruhwiler, J.R. Cary, V.K. Decyk, E. Esarey, C.G.R. Geddes, C. Huang, A. Hakim, T. Katsouleas, W. Lu, P. Messmer, W.B. Mori, M. Tzoufras and J. Vieira, "Three-dimensional particle-in-cell simulations of laser wakefield experiments," J. Phys. Conf. Series V 78, pp 12077/1-9 (2007). LBNL-63731. [Tsung, Geddes particle in cell modeling SicDAC2007.pdf]

A.J. Gonsalves, K. Nakamura, Cs. Toth, C.G.R. Geddes, C.B. Schroeder, E. Esarey, E. Cormier-Michel, D. Bruhwiler, J.R. Cary, S. M. Hooker, W. P. Leemans, "GeV electron beams from a centimeter-scale laser-driven plasma accelerator", Proc. Particle Accel Conference, Albuquerque NM, pp. 1911-1915 (2007). LBNL-63070. [Gonsalves, Geddes GeV capillary PAC 2007.pdf]

K. Nakamura, E. Esarey, C.G.R. Geddes, A.J. Gonsalves, W.P. Leemans, D. Panasenko, C.B. Schroeder and C. Toth, "Performance of capillary discharge guided laser plasma wakefield accelerator," Proc. Particle Accel Conference, Albuquerque NM, pp. 2978-2980 (2007). LBNL-63270. [Nakamura, Geddes capillary performance PAC 2007.pdf]

C. Toth, E. Esarey, C.G.R. Geddes, W.P. Leemans, K. Nakamura, D. Panasenko, C.B. Schroeder, "Colliding pulse injection experiments in non-collinear geometry for controlled laser plasma wakefield acceleration of electron," Proc. Particle Accel Conference, Albuquerque NM, pp. 2975-77 (2007). LBNL-63271. [Toth, Geddes Colliding pulse PAC 2007.pdf]

C.B. Schroeder, Cs. Toth, B. Nagler, A.J. Gonsalves, K. Nakamura, C.G.R. Geddes, E. Esarey, S.M. Hooker, W.P. Leemans, "GeV electron beams from a laser-plasma accelerator," Proceedings of the IEEE LEOS Annual Meeting Conference Piscataway, NJ, USA(IEEE Cat. No. 06CH37736C), pp. 2. LBNL-61982. (2006).

W.P. Leemans, E. Esarey, C.G.R. Geddes, C.B. Schroeder, Cs. Toth, "Laser guiding for GeV laser-plasma accelerators", Phil. Trans. R. Soc. A, V 364, pp. 585-600 (2006). LBNL-58352.

D.L. Bruhwiler and T. Antonsen and J.R. Cary and J. Coolery and V.K. Dycek and E. Esarey and C.G.R. Geddes and C. Huang and A. Hakim and T. Katsouleas and P. Messmer and W.B. Mori and F.S. Tsung and J. Vieira and M. Zhou, ﾒTowards the petascale in electromagnetic modeling of plasma-based accelerators for high-energy physics,ﾓ J. Phys. Conf. Series 46, pp. 215 (2006). LBNL-63733.

C.G.R. Geddes, E. Esarey, P. Michel, B. Nagler, K. Nakamura, G.R. Plateau, C.B. Schroeder, B.A. Shadwick, Cs. Toth, J Van Tilborg, W.P. Leemans, "Low energy spread 100 mev-1 gev electron bunches from laser wakefield acceleration at loasis," Proceedings of the Linac Conference, Knoxville TN, pp. 806-808 (2006). LBNL-63722. [geddes low energy spread bunches, linac 2006pdf]

E. Michel, B. A. Shadwick, C. B. Schroeder, C. G. R. Geddes, E. Esarey, W. P. Leemans, H. Ruhl and T. Cowan, "Accurate Modeling of Laser-Plasma Accelerators with Particle-In-Cell Codes," Proceedings of the Advanced Accelerator Concepts Workshop, Lake Geneva WI, pp. 213- 219 (2006). LBNL-63071. [michel,geddes numerics.pdf]

E. Esarey, B. Nagler, A.J. Gonsalves, Cs. Toth, K. Nakamura, C.G.R. Geddes, C.B. Schroeder, S.M. Hooker, W.P. Leemans, E. Michel, J. Cary, and D. Bruhwiler, "High quality electron bunches up to 1 GeV from laser wakefield acceleration at LBNL", Proceedings of the Advanced Accelerator Concepts Workshop, Lake Geneva WI, pp. 8-14, (2006). LBNL-63724.

J. van Tilborg, C.B. Schroeder, C.V. Filip, Cs. Toth, C.G.R. Geddes, G. Fubiani, E. Esarey, and W.P. Leemans, "Terahertz radiation as a bunch diagnostic for laser-wakefield-accelerated electron bunches," Phys. Plasmas V 13, 056704/1-9 (2006). [ LBNL-60017.vantilborg, geddes THz pop 2006.pdf]

Cs. Toth, J. van Tilborg, C.B. Schroeder, C.G.R. Geddes,E. Esarey, and W.P. Leemans, "Spatio-Temporal Properties of Single-Cycle THz Pulses Generated by Relativistic Electron Beams in a Laser-Plasma Accelerator," Proc. Ultrafast Phenomena XV (2006). W.P. Leemans, E. Esarey, C.G.R. Geddes, C.B. Schroeder, Cs. Toth, "Recent progress on laser driven accelerators and applications," Nuclear Engineering and Technology, 37, pp. 299-308 (2005). LBNL-61207.

C.G.R. Geddes, Cs. Toth, J Van Tilborg, E. Esarey, C.B. Schroeder, D. Bruhwiler, C. Nieter, J.R. Cary, W.P. Leemans, "Laser Guiding at Relativistic Intensities and Wakefield Particle Acceleration in Plasma Channels," Conference on Lasers and Electro Optics, Baltimore MD (2005). LBNL-56157. [Geddes guiding+accel CLEO 2005.pdf]

C.G.R. Geddes, E. Esarey, C.B. Schroeder, Cs. Toth, J Van Tilborg, J.R. Cary, C. Nieter, W.P. Leemans, "Mono-Energetic Beams From Laser Plasma Interactions," Proceedings of the Particle Accelerator Conference, Knoxville TN, pp. 69-73 (2005). LBNL-56964. [Geddes monoenergetic beams PAC 2005.pdf]

P. Messmer, D. Bruhwiler, D. Dimitrov, P. Stoltz, W.P. Leemans, E. Esarey, C. Geddes, "Particle-In-Cell Simulations Of Lower-Density cm-Scale Capillary Channels," Proceedings of the Particle Accelerator Conference, Knoxville TN (2005). LBNL-58374. [Messmer,Geddes cm scale simulations 2005.pdf]

R. E. Giacone, D. A. Dimitrov, D. L. Bruhwiler, P. Messmer and J. R. Cary, C. G. R. Geddes, E. Esarey and W. Leemans, "Simulations Of Laser Pulse Coupling And Transmission Efficiency In Plasma Channels," Proceedings of the Particle Accelerator Conference, Knoxville TN (2005). LBNL-61232 [Giaconne, Geddes coupling simulation PAC 2005.PDF]

C.G.R. Geddes, Cs. Toth, J. Van Tilborg, E. Esarey, C.B. Schroeder, D. Bruhwiler, J. Cary, W.P. Leemans, "Laser Guiding at Relativistic Intensities and Wakefield Particle Acceleration in Plasma Channels," Proceedings of the Advanced Accelerator Concepts Workshop, Brookhaven NY, pp. 521-7, (2004). [ Geddes Guided Accel AAC 2004.pdf ]

Cs. Toth, C.G.R. Geddes, J. van Tilborg, and W. P. Leemans, "A multi-beam, multi-terawatt Ti: sapphire laser system for laser wake-field acceleration studies," Proceedings of the Advanced Accelerator Concepts Workshop (Amer. Inst. Phys., NY, #737), Brookhaven NY, pp. 978-982 (2004). LBNL-57056. [Toth, Geddes laser AAC 2004.pdf]

K. Nakamura, G. Fubiani, C.G.R. Geddes, P. Michel, J. van Tilborg, C. Toth, E. Esarey, C.B. Schroeder, and W.P. Leemans, "Laser Triggered Injection of Electrons in a Laser Wakefield Accelerator with the Colliding Pulse Method," Proceedings of the Advanced Accelerator Concepts Workshop (Amer. Inst. Phys., NY, #737), Brookhaven NY, pp. 901-906 (2004). LBNL-56575. [Nakamura, Geddes Injection AAC 2004.pdf]

J. van Tilborg, C.G.R. Geddes, C. Toth, E. Esarey, C.B. Schroeder, M. C. Martin, Z. Hao, and W.P. Leemans, "Coherent Transition Radiation From a Laser Wakefield Accelerator as an Electron Bunch Diagnostic," Proceedings of the Advanced Accelerator Concepts Workshop (Amer. Inst. Phys., NY, #737), Brookhaven NY, pp. 372-378 (2004). LBNL-56573. []

D.A. Dimitrov, D. L. Bruhwiler, J.R. Cary, P. Messmer, C.G.R. Geddes, W. Leemans and E. Esarey, "Particle-in-cell simulations of intense laser pulses coupling into plasma channels",Proceedings of the Advanced Accelerator Concepts Workshop (Amer. Inst. Phys., NY, #737), Brookhaven NY, pp. 469-477 (2004). LBNL-57057. []

C.G.R. Geddes, Cs. T葉h, J. van Tilborg, and W.P. Leemans, "Laser guiding at > 10^18 W/cm^2 in plasma channels formed by the ignitor heater method", Proceedings of CLEO/IQEC 2004 Conference, San Francisco, CA, May 16 - 21, (2004). LBNL-51833. []

W.P. Leemans, C.G.R. Geddes, J. van Tilborg, M. Dickinson, S. DiMaggio, D. Syversrud, J. Wallig, N. Ybarrolaza, and Cs. Toth, "L'OASIS Ti:sapphire laser facility: a multi-beam, multi-terawatt system for wake-field acceleration studies," Proceedings of the CLEO/IQEC 2004 Conference, San Francisco, CA (2004). LBNL-57114. []

J. van Tilborg, G. Fubiani, C.G.R. Geddes, Cs. T葉h, E. Esarey, C.B. Schroeder, and W.P. Leemans, "High-energy coherent THz radiation from laser wakefield accelerated ultrashort electron bunches," Proceedings of the CLEO/IQEC 2004 Conference, San Franscico, CA (2004). LBNL-55864. []

Cs. Toth, J. van Tilborg, C.G.R. Geddes, G. Fubiani, C.B. Schroeder, E. Esarey, J. Faure, G. Dugan, and W.P. Leemans, "Powerful pulsed THz radiation from laser-accelerated relativistic electron bunches," Proceedings SPIE 5448, pp. 491-504 (2004). LBNL-57055. [Toth, Geddes THz SPIE2004.pdf]

Cs. Toth, J. Faure, J. van Tilborg, C. G. R. Geddes, C. B. Schroeder, E. Esarey, W. P. Leemans, "Asymmetric Pulse Shapes in Grating-Based CPA Compressors and Optimal Electron Acceleration in Plasmas," in Ultrafast Optics IV, Eds. Ferenc Krausz, Georg Korn, Paul Corkum, and Ian A. Walmsley (Springer, Berlin) pp. 351-358 (2004). LBNL-57054. []

E. Esarey, C.B. Schroeder, B.A. Shadwick, J. van Tilborg, C.G.R. Geddes, Cs. Toth, W.P. Leemans. "Radiation generation from plasma-based accelerators," IEEE International Conference On Plasma Science, Piscataway, NJ, pp.156 (2004). Cs. Toth, J. Faure, C.G.R. Geddes, J. van Tilborg, W.P. Leemans "Shaping of pulses in optical grating-based laser systems for optimal control of electrons in laser plasma wake-field accelerator," Proceedings of the 2003 Particle Accelerator Conference vol.3, Piscataway, NJ, pp.1840-2 (2003). LBNL-51819.