Search Results - "Downer, M. C."

Diagnostics for plasma-based electron accelerators by Downer, M. C., Zgadzaj, R., Debus, A., Schramm, U., Kaluza, M. C.

“…Plasma-based accelerators that impart energy gain as high as several GeV to electrons or positrons within a few centimeters have engendered a new class of…”
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Stable Positron Acceleration in Thin, Warm, Hollow Plasma Channels by Silva, T., Amorim, L. D., Downer, M. C., Hogan, M. J., Yakimenko, V., Zgadzaj, R., Vieira, J.

“…Hollow plasma channels are attractive for lepton acceleration because they provide intrinsic emittance preservation regimes. However, beam breakup…”
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Plasma electron acceleration driven by a long-wave-infrared laser by Zgadzaj, R., Welch, J., Cao, Y., Amorim, L. D., Cheng, A., Gaikwad, A., Iapozzutto, P., Kumar, P., Litvinenko, V. N., Petrushina, I., Samulyak, R., Vafaei-Najafabadi, N., Joshi, C., Zhang, C., Babzien, M., Fedurin, M., Kupfer, R., Kusche, K., Palmer, M. A., Pogorelsky, I. V., Polyanskiy, M. N., Swinson, C., Downer, M. C.

“…Laser-driven plasma accelerators provide tabletop sources of relativistic electron bunches and femtosecond x-ray pulses, but usually require petawatt-class…”
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Coherent Optical Signatures of Electron Microbunching in Laser-Driven Plasma Accelerators by Lumpkin, A. H., LaBerge, M., Rule, D. W., Zgadzaj, R., Hannasch, A., Zarini, O., Bowers, B., Irman, A., Couperus Cabadağ, J. P., Debus, A., Köhler, A., Schramm, U., Downer, M. C.

“…We report observations of coherent optical transition radiation interferometry (COTRI) patterns generated by microbunched ∼ 200 − MeV electrons as they emerge…”
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Dissipation of electron-beam-driven plasma wakes by Zgadzaj, Rafal, Silva, T., Khudyakov, V. K., Sosedkin, A., Allen, J., Gessner, S., Li, Zhengyan, Litos, M., Vieira, J., Lotov, K. V., Hogan, M. J., Yakimenko, V., Downer, M. C.

“…Metre-scale plasma wakefield accelerators have imparted energy gain approaching 10 gigaelectronvolts to single nano-Coulomb electron bunches. To reach useful…”
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Compact spectroscopy of keV to MeV X-rays from a laser wakefield accelerator by Hannasch, A., Laso Garcia, A., LaBerge, M., Zgadzaj, R., Köhler, A., Couperus Cabadağ, J. P., Zarini, O., Kurz, T., Ferrari, A., Molodtsova, M., Naumann, L., Cowan, T. E., Schramm, U., Irman, A., Downer, M. C.

“…We reconstruct spectra of secondary X-rays from a tunable 250–350 MeV laser wakefield electron accelerator from single-shot X-ray depth-energy measurements in…”
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Snapshots of laser wakefields by Matlis, N. H, Downer, M. C, Reed, S, Bulanov, S. S, Chvykov, V, Kalintchenko, G, Matsuoka, T, Rousseau, P, Yanovsky, V, Maksimchuk, A, Kalmykov, S, Shvets, G

“…Tabletop plasma accelerators can now produce GeV-range electron beams and femtosecond X-ray pulses, providing compact radiation sources for medicine, nuclear…”
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Optical characterization of temperature‐ and composition‐dependent microstructure in asphalt binders by RAMM, A., SAKIB, N., BHASIN, A., DOWNER, M.C.

“…Summary We introduce noncontact optical microscopy and optical scattering to characterize asphalt binder microstructure at temperatures ranging from 15°C to…”
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Quasi-monoenergetic laser-plasma acceleration of electrons to 2 GeV by Wang, Xiaoming, Zgadzaj, Rafal, Fazel, Neil, Li, Zhengyan, Yi, S. A., Zhang, Xi, Henderson, Watson, Chang, Y.-Y., Korzekwa, R., Tsai, H.-E., Pai, C.-H., Quevedo, H., Dyer, G., Gaul, E., Martinez, M., Bernstein, A. C., Borger, T., Spinks, M., Donovan, M., Khudik, V., Shvets, G., Ditmire, T., Downer, M. C.

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Single-shot visualization of evolving laser wakefields using an all-optical streak camera by Li, Zhengyan, Tsai, Hai-En, Zhang, Xi, Pai, Chih-Hao, Chang, Yen-Yu, Zgadzaj, Rafal, Wang, Xiaoming, Khudik, V, Shvets, G, Downer, M C

“…We visualize ps-time-scale evolution of an electron density bubble--a wake structure created in atmospheric density plasma by an intense ultrashort laser…”
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Enhanced harmonic generation from expanding clusters by Shim, B, Hays, G, Zgadzaj, R, Ditmire, T, Downer, M C

“…We report controlled enhancement of optical third harmonic generation (THG) from hydrodynamically expanding clusters of approximately 6x10(5) noble-gas atoms…”
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Characterization of cluster/monomer ratio in pulsed supersonic gas jets by Gao, X., Wang, X., Shim, B., Arefiev, A. V., Korzekwa, R., Downer, M. C.

“…We determine cluster mass fraction f c ( r , t ) at position r within, and time t after firing, a pulsed supersonic gas jet by measuring femtosecond evolution…”
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Formation of optical bullets in laser-driven plasma bubble accelerators by Dong, Peng, Reed, S A, Yi, S A, Kalmykov, S, Shvets, G, Downer, M C, Matlis, N H, Leemans, W P, McGuffey, C, Bulanov, S S, Chvykov, V, Kalintchenko, G, Krushelnick, K, Maksimchuk, A, Matsuoka, T, Thomas, A G R, Yanovsky, V

“…Electron density bubbles--wake structures generated in plasma of density n(e) approximately 10(19) cm(-3) by the light pressure of intense ultrashort laser…”
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Single-beam and enhanced two-beam second-harmonic generation from silicon nanocrystals by use of spatially inhomogeneous femtosecond pulses by FIGLIOZZI, P, SUN, L, JIANG, Y, MATLIS, N, MATTERN, B, DOWNER, M. C, WITHROW, S. P, WHITE, C. W, MOCHAN, W. L, MENDOZA, B. S

“…Optical second-harmonic generation (SHG) is used as a noninvasive probe of the interfaces of Si nanocrystals (NCs) embedded uniformly in an SiO2 matrix…”
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Morphology and kinetics of asphalt binder microstructure at gas, liquid and solid interfaces by RAMM, A., DOWNER, M.C., SAKIB, N., BHASIN, A.

“…Summary We combined optical and atomic force microscopy to observe morphology and kinetics of microstructures (typically referred to as bees) that formed at…”
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Quasi-monoenergetic laser-plasma acceleration of electrons to 2 GeV by Wang, Xiaoming, Zgadzaj, Rafal, Fazel, Neil, Li, Zhengyan, Yi, S. A., Zhang, Xi, Henderson, Watson, Chang, Y.-Y., Korzekwa, R., Tsai, H.-E., Pai, C.-H., Quevedo, H., Dyer, G., Gaul, E., Martinez, M., Bernstein, A. C., Borger, T., Spinks, M., Donovan, M., Khudik, V., Shvets, G., Ditmire, T., Downer, M. C.

“…Laser-plasma accelerators of only a centimetre’s length have produced nearly monoenergetic electron bunches with energy as high as 1 GeV. Scaling these compact…”
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Opportunistic screening for oral cancer and precancer in general dental practice: results of a demonstration study by Speight, P M, Lim, K, Moles, D R, Downer, M C

“…To demonstrate the feasibility of opportunistic oral cancer and precancer screening in general dental practice and to determine the prevalence of relevant…”
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Holographic visualization of laser wakefields by Dong, P, Reed, S A, Yi, S A, Kalmykov, S, Li, Z Y, Shvets, G, Matlis, N H, McGuffey, C, Bulanov, S S, Chvykov, V, Kalintchenko, G, Krushelnick, K, Maksimchuk, A, Matsuoka, T, Thomas, A G R, Yanovsky, V, Downer, M C

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Generation and acceleration of electron bunches from a plasma photocathode by Deng, A., Karger, O. S., Heinemann, T., Knetsch, A., Scherkl, P., Manahan, G. G., Beaton, A., Ullmann, D., Wittig, G., Habib, A. F., Xi, Y., Litos, M. D., O’Shea, B. D., Gessner, S., Clarke, C. I., Green, S. Z., Lindstrøm, C. A., Adli, E., Zgadzaj, R., Downer, M. C., Andonian, G., Murokh, A., Bruhwiler, D. L., Cary, J. R., Hogan, M. J., Yakimenko, V., Rosenzweig, J. B., Hidding, B.

“…Plasma waves generated in the wake of intense, relativistic laser 1 , 2 or particle beams 3 , 4 can accelerate electron bunches to gigaelectronvolt energies in…”
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Revealing the three-dimensional structure of microbunched plasma-wakefield-accelerated electron beams by LaBerge, Maxwell, Bowers, Brant, Chang, Yen-Yu, Couperus Cabadağ, Jurjen, Debus, Alexander, Hannasch, Andrea, Pausch, Richard, Schöbel, Susanne, Tiebel, Jessica, Ufer, Patrick, Willmann, Anna, Zarini, Omid, Zgadzaj, Rafal, Lumpkin, Alex H., Schramm, Ulrich, Irman, Arie, Downer, M. C.

“…Plasma wakefield accelerators use tabletop equipment to produce relativistic femtosecond electron bunches. Optical and X-ray diagnostics have established that…”
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