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Your search keyword '"Heimann, P.A."' showing total 190 results
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190 results on '"Heimann, P.A."'

1. Femtosecond Near Edge X-ray Absorption Measurement of the VO2 Phase Transition

Author

Cavalleri, A., Chong, H.H.W., Fourmaux, S., Glover, T.E., Heimann, P.A, Kieffer, J.C., Padmore, H.A., and Schoenlein, R.W.

Subjects
Materials science, Condensed matter physics, superconductivity and superfluidity, femtosecond x-ray correlated electron system vanadium ultrafast spectroscopy
Published
2004

2. Generation of femtosecond synchrotron pulses: Performance and characterization

Author

Schoenlein, R.W., Cavalleri, A., Chong, H.H.W., Glover, T.E., Heimann, P.A., Zholents, A.A., and Zolotorev, M.S.

Subjects
Particle accelerators, Materials science, femtosecond x-ray synchrotron time-resolved ultrafast
Abstract

Femtosecond synchrotron pulses of 13 MeV relative to the nominal 1.9 GeV beam energy. Femtosecond pulses are effectively isolated from the long-pulse background using the transverse dispersion of the storage ring in combination with an x-ray imaging optic and a pair of slits to achieve a signal/background ratio of ~;1.

Published
2003

3. Proposal to DOE Basic Energy Sciences: Ultrafast X-ray science facility at the Advanced Light Source

Author

Schoenlein, Robert W., Falcone, Roger W., Abela, R., Alivisatos, A.P., Belkacem, A., Berrah, N., Bozek, J., Bressler, C., Cavalleri, A., Chergui, M., Glover, T.E., Heimann, P.A., Hepburn, J., Larsson, J., Lee, R.W., McCusker, J., Padmore, H.A., Pattison, P., Pratt, S.T., Shank, C.V., Wark, J., Chang, Z., Robin, D.W., Schlueter, R.D., Zholents, A.A., and Zolotorev, M.S.

Subjects
Instrumentation -- other, Materials science, Condensed matter physics, superconductivity and superfluidity, femtosecond x-ray undulator beamline
Published
2001

5. Ultrafast x-ray science at the Advanced Light Source

Author

Schoenlein, R.W., Chin, A.H., Chong, H.H.W., Falcone, R.W., Glover, T.E., Heimann, P.A., Johnson, S.L., Lindenberg, A.M., Shank, C.V., Zholents, A.A., and Zolotorev, M.S.

Subjects
Instrumentation -- other, Materials science, Particle accelerators, femtosecond x-rays time-resolved dynamics synchrotron slice
Abstract

Our scientific understanding of the static or time-averaged structure of condensed matter on the atomic scale has been dramatically advanced by direct structural measurements using x-ray techniques and modern synchrotron sources. Of course the structure of condensed matter is not static, and to understanding the behavior of condensed matter at the most fundamental level requires structural measurements on the time scale on which atoms move. The evolution of condensed-matter structure, via the making and breaking of chemical bonds and the rearrangement of atoms, occurs on the fundamental time scale of a vibrational period, ~;100 fs. Atomic motion and structural dynamics on this time scale ultimately determine the course of phase transitions in solids, the kinetic pathways of chemical reactions, and even the efficiency and function of biological processes. The integration of x-ray measurement techniques, a high-brightness femtosecond x-ray source, femtosecond lasers, and stroboscopic pump-probe techniques will provide the unique capability to address fundamental scientific questions in solid-state physics, chemistry, AMO physics, and biology involving structural dynamics. In this paper, we review recent work in ultrafast x-ray science at the ALS including time-resolved diffraction measurements and efforts to develop dedicated beamlines for femtosecond x-ray experiments.

Published
2000

6. Femtosecond x-ray pulses from a synchrotron

Author

Schoenlein, R.W., Chong, H.H.W., Glover, T.E., Heimann, P.A., Shank, C.V., Zholents, A.A., and Zolotorev, M.S.

Subjects
Instrumentation -- other, Materials science, femtosecond x-ray synchrotron beamline structural dynamics
Abstract

An important frontier in ultrafast science is the application of femtosecond x-ray pulses to the study of structural dynamics in condensed matter. We show that femtosecond laser pulses can be used to generate high-brightness, tunable, femtosecond x-ray pulses from a synchrotron. Performance of existing and proposed femtosecond x-ray beamlines at the Advanced Light Source synchrotron are discussed.

Published
2000

17. Opacity effects in a solid-density aluminium plasma created by photo-excitation with an X-ray laser

Author

Rackstraw, D.S., Vinko, S.M., Ciricosta, O., Cho, B.I., Engelhorn, K., Chung, H.-K., Brown, C.R.D., Burian, T., Chalupský, J., Falcone, R.W., Graves, C., Hájková, V., Higginbotham, A., Juha, L., Krzywinski, J., Lee, H.J., Messerschmidt, M., Murphy, C., Ping, Y., Scherz, A., Schlotter, W., Toleikis, S., Turner, J.J., Vysin, L., Wang, T., Wu, B., Zastrau, U., Zhu, D., Nagler, B., Lee, R.W., Heimann, P.A., and Wark, J.S.

Published
2014
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18. TOF-OFF: A method for determining focal positions in tightly focused free-electron laser experiments by measurement of ejected ions

Author

Iwan, B., Andreasson, J., Andrejczuk, A., Abreu, E., Bergh, M., Caleman, C., Nelson, A.J., Bajt, S., Chalupsky, J., Chapman, H.N., Fäustlin, R.R., Hajkova, V., Heimann, P.A., Hjörvarsson, B., Juha, L., Klinger, D., Krzywinski, J., Nagler, B., Pálsson, G.K., Singer, W., Seibert, M.M., Sobierajski, R., Toleikis, S., Tschentscher, T., Vinko, S.M., Lee, R.W., Hajdu, J., and Tîmneanu, N.

Published
2011
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21. Creation and diagnosis of a solid-density plasma with an X-ray free-electron laser

Author

Vinko, S.M., Ciricosta, O., Cho, B.I., Engelhorn, K., Chung, H.-K., Brown, C.R.D., Burian, T., Chalupsky, J., Falcone, R.W., Graves, C., Hajkova, V., Higginbotham, A., Juha, L., Krzywinski, J., Lee, H.J., Messerschmidt, M., Murphy, C.D., Ping, Y., Scherz, A., Schlotter, W., Toleikis, S., Turner, J.J., Vysin, L., Wang, T., Wu, B., Zastrau, U., Zhu, D., Lee, R.W., Heimann, P.A., Nagler, B., and Wark, J.S.

Subjects
X-ray lasers -- Usage, Free electron lasers -- Usage, Plasma (Ionized gases) -- Origin -- Chemical properties -- Atomic properties, High temperature plasmas -- Origin -- Chemical properties -- Atomic properties, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Matter with a high energy density (> [10.sup.5] joules per [cm.sup.3]) is prevalent throughout the Universe, being present in all types of stars (1) and towards the centre of the giant planets (2,3); it is also relevant for inertial confinement fusion (4). Its thermodynamic and transport properties are challenging to measure, requiring the creation of sufficiently long-lived samples at homogeneous temperatures and densities (5,6). With the advent of the Linac Coherent Light Source (LCLS) X-ray laser (7), high-intensity radiation (>[10.sup.17] watts per [cm.sup.2], previously the domain of optical lasers) can be produced at X-ray wavelengths. The interaction of single atoms with such intense X-rays has recently been investigated (8). An understanding of the contrasting case of intense X-ray interaction with dense systems is important from a fundamental viewpoint and for applications. Here we report the experimental creation of a solid-density plasma at temperatures in excess of [10.sup.6] kelvin on inertial-confinement time-scales using an X-ray free-electron laser. We discuss the pertinent physics of the intense X-ray-matter interactions, and illustrate the importance of electron-ion collisions. Detailed simulations of the interaction process conducted with a radiative-collisional code show good qualitative agreement with the experimental results. We obtain insights into the evolution of the charge state distribution of the system, the electron density and temperature, and the timescales of collisional processes. Our results should inform future high-intensity X-ray experiments involving dense samples, such as X-ray diffractive imaging of biological systems, material science investigations, and the study of matter in extreme conditions., The experiment was performed at the LCLS soft X-ray materials science instrument (SXR), where a 1.0-µm-thick aluminium (Al) foil was irradiated with 80-fs X-ray pulses at photon energies in the [...]

Published
2012
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30. The LBL 55-Meter Spherical Grating Monochromator at SSRL

Author

McKinney, W.R., Howells, M.R., Lauritzen, T., Chin, J., DiGennaro, R., Fong, E., Gath, W., Guigli, J., Hogrefe, H., Meneghetti, J., Plate, D., Heimann, P.A., Terminello, Louis J., Ji, Z., Shirley, D.A., and Senf, S.

Published
1989

34. Proposal to DOE Basic Energy Sciences: Ultrafast X-ray science facility at the Advanced Light Source

Author

Schoenlein, Robert W., primary, Falcone, Roger W., additional, Abela, R., additional, Alivisatos, A.P., additional, Belkacem, A., additional, Berrah, N., additional, Bozek, J., additional, Bressler, C., additional, Cavalleri, A., additional, Chergui, M., additional, Glover, T.E., additional, Heimann, P.A., additional, Hepburn, J., additional, Larsson, J., additional, Lee, R.W., additional, McCusker, J., additional, Padmore, H.A., additional, Pattison, P., additional, Pratt, S.T., additional, Shank, C.V., additional, Wark, J., additional, Chang, Z., additional, Robin, D.W., additional, Schlueter, R.D., additional, Zholents, A.A., additional, and Zolotorev, M.S., additional

Published
2001
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35. Ultrafast x-ray science at the Advanced Light Source

Author

Schoenlein, R.W., primary, Chin, A.H., additional, Chong, H.H.W., additional, Falcone, R.W., additional, Glover, T.E., additional, Heimann, P.A., additional, Johnson, S.L., additional, Lindenberg, A.M., additional, Shank, C.V., additional, Zholents, A.A., additional, and Zolotorev, M.S., additional

Published
2000
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37. Ultrafast structural changes measured by time-resolved X-ray diffraction

Author

Physics Department and Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, MI 48109, USA, US, Physics Department, University of California at Berkeley, Berkeley, CA 94720, USA (E-mail: jorgen@physics.berkeley.edu), US, Physics Department, Clarendon Laboratory, University of Oxford, Oxford OX13PU, UK, UK, Advanced Light Source, Accelerator and Fusion Research Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA, US, Lawrence Livermore National Laboratory, Livermore, CA 94551, USA, US, Ann Arbor, Wark, J.S., Heimann, P.A., Padmore, H.A., Schuck, P.J., Lindenberg, A.M., Lee, R.W., Falcone, R.W., Bucksbaum, Philip H., Larsson, J., Physics Department and Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, MI 48109, USA, US, Physics Department, University of California at Berkeley, Berkeley, CA 94720, USA (E-mail: jorgen@physics.berkeley.edu), US, Physics Department, Clarendon Laboratory, University of Oxford, Oxford OX13PU, UK, UK, Advanced Light Source, Accelerator and Fusion Research Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA, US, Lawrence Livermore National Laboratory, Livermore, CA 94551, USA, US, Ann Arbor, Wark, J.S., Heimann, P.A., Padmore, H.A., Schuck, P.J., Lindenberg, A.M., Lee, R.W., Falcone, R.W., Bucksbaum, Philip H., and Larsson, J.

Published
2006

47. High-resolution beamline 9.3.2 in the energy range 30–1500 eV at the Advanced Light Source: Design and performance

Author

Hussain, Z., primary, Huff, W.R.A., additional, Kellar, S.A., additional, Moler, E.J., additional, Heimann, P.A., additional, McKinney, W., additional, Cummings, C., additional, Lauritzen, T., additional, McKean, J.P., additional, Palomares, F.J., additional, Wu, H., additional, Zheng, Y., additional, Young, A.T., additional, Padmore, H.A., additional, Fadley, C.S., additional, and Shirley, D.A., additional

Published
1996
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