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Current Group Members
Group Leader

Roger Falcone
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I have been teaching at UC Berkeley in the Physics
Department since 1983, and served as Department Chair
from 1995 to 2000. I am also affiliated with the
Lawrence Berkeley National Laboratory and the Stanford
Linear Accelerator Center, where our group conducts
research in atomic, molecular, and solid state physics
using ultrafast-pulse lasers and x-rays. My other
activities include working with Berkeley's Lawrence
Hall of Science and other groups on K-12 education
issues, collaborative research with Lawrence Livermore
National Laboratory, and occasional studies related to
national security.
Recently I became the Director of the Advanced Light
Source at LBNL (see
http://www-als.lbl.gov/als/ourorg/falcone.html)
and co-director of the Cal Teach Program at UC
Berkeley (see
http://calteach.berkeley.edu/).
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Graduate Students
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With the advent of more intense x-ray sources, we are
beginning to reach intensities in which non-linear
effects will become important in the x-ray regime. I
wish to explore this new regime of physics and
discover novel methods of manipulating the interaction
of intense x-ray beams with matter to study ultrafast
phenomena. I am also interested in plasma physics,
chaos theory, and phase transitions. I obtained my
B.S. in Applied Physics from Cornell University in
2003.
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My work is now focused on applying first principles
and computational techniques to calculate structural
and electronic properties of Carbon in its different
high pressure phases. I am using molecular dynamic
simulations combined with density functional
theory. We use simulations to help in the
interpretation of experimental results on the melting
of carbon. The goal of the project is to have an
accurate phase diagram of carbon, including the
computation of its thermodynamics and electronic
properties.
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I received a BS and MS in Electrical and Computer
Engineering from Carnegie Mellon University in
Pittsburgh, PA. I am currently a PhD student in
Applied Science and Technology (Applied Physics) at
UCB. I will be working at LBL on ultrafast streak
camera development and ultrafast measurements. My
other research interests include X and gamma-ray
detector systems for medical physics. When not in the
lab, I can often be found running, hiking, biking, or
tap dancing.
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PostDocs
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My research interests are in study of electronic and
structural changes using ultrafast x-ray
diffraction, absorption, spectroscopy. This involves
condensed matter, warm dense matter, and the plasma
regime. Dynamics of laser-pulse-excited material will
be observed through a synchrotron x-ray source with
sub-picosecond pulses. In addition, I will also
perform Thomson scattering on high temperature dense
plasmas for the understanding of the mechanism and the
interaction of the atoms/ions. I received my BS in
Physics from KAIST and obtained MS and PhD in Physics
from Seoul National University, Korea.
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At beamline 6 of the Advanced Light Source, an amplified femtosecond laser system is synchronized with soft- and hard-x-ray synchrotron radiation for pump-probe experiments. Our experiments probe materials with mean energies of a few eV: the "warm, dense matter" (WDM) regime, which lies between those of condensed matter and strongly-coupled plasmas. Material properties in this regime are largely unknown; and because many experiments creating WDM create a short-lived, nonequilibrium state, probing the ultrafast dynamics of this state is particularly important. We create WDM from thin foils through the absorption of a short pulse of light containing several milijoules of energy. This laser pulse is overlapped at the foil in time and space with a broadband x-ray pulse. The transmitted x-rays are dispersed for ~1 eV resolution and swept to picosecond resolution by an x-ray streak camera, giving a near-edge x-ray absorption spectrum of the WDM before it melts or ablates.
I did my Ph.D. work in condensed-matter physics at UC Berkeley, in the group of Joe Orenstein. There I developed and used ultrafast transient-spin-grating spectroscopy to study spin propagation and spin-space correlations in two-dimensional electron gases in GaAs quantum wells. The length scales were microns, and the time-scales were picoseconds. For details and publications, please see my CV.
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Former Group Members
Tom
Donnelly
Associate Professor Department of Physics Harvey Mudd
College
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Ernie Glover
Beamline Scientist Advanced Light Source Lawrence
Berkeley National Laboratory
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Ken Goldberg
Staff Physicist Center for X-Ray Optics Lawrence
Berkeley National Laboratory
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Susanna Gordon
Manager Systems Studies Department Sandia National
Laboratories
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Harald Hamster
Mannaging Director RHK Inc.
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Steve Johnson
Paul Scherrer Institut Switzerland
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Ellen Judd
PhD Graduate, Applied Physics Department Stanford University
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Inuk Kang
Member of the Technical Staff Bell Labs - Lucent Technologies
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Henry Kapteyn
Professor, Department of Physics and JILA University of
Colorado, Boulder
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Jorgen
Larsson
Professor, Department of Physics, Lund University
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Aaron
Lindenberg
Staff Scientist, Stanford Linear Accelerator Center
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Margaret
Murnane Professor, Department of Physics and JILA
University of Colorado, Boulder
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Keir
Neuman
Postdoctoral Fellow, Biophysics Ecole Normale Superieure, Paris
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David Ponce
National Research Council Associate Naval Research Laboratory
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Jim
Schuck
Postdoctoral Fellow, Department of Chemistry Stanford University
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Richard Snavely
Postdoc, Lawrence Livermore National Laboratory
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Alan
Sullivan
President, LightSpace Technologies
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Dana
Weinstein
Graduate Student, School of Applied and Engineering
Physics Cornell University
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