Compact High-brilliance Synchrotron Source Driven by a Tabletop Laser
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Compact High-brilliance Synchrotron Source
Driven by a Tabletop Laser
C. McGuffey a, W. Schumaker a, S. Kneip b, F. Dollar a, A. Maksimchuka, A. G. R. Thomas a, and K. Krushelnick a
(a) University of Michigan, Center for Ultrafast Optical Science(b) Imperial College, London
Michigan Institute for Plasma Science & Engineering seminar2010.09.29
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MIPSE 2010.09.29 2
Extreme light sources in high demand Linac Coherent Light Source
(SLAC)◦ 3 km total length◦ $379M upgrade◦ 100 fs x-ray pulses @ 120 Hz◦ up to 8 keV
Advanced Photon Source (ANL)◦ Spectral brightness 5x1019
photons/s/mm2/mrad2/0.1%BW up to 40 keV
Advanced Light Source (LBNL) Diamond (U.K.) European Synchrotron
Radiation Facility (France)lcls.slac.standford.edu
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Introduction to Laser Wakefield Acceleration (LWFA) and radiation generation
Characterization of synchrotron radiation Radiography demonstration
MIPSE 2010.09.29 3
Overview
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MIPSE 2010.09.29 4
Linear wakefield The ponderomotive force of the laser expels electrons. The stationary ions provide a restoring force, so that
electrons behind the laser oscillate at the plasma frequency. Electrostatic fields as strong as 100 GeV/m due to space
charge
)2/( 22 acmF epond
Color indicates electron density
e-
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MIPSE 2010.09.29 5
Bubble regime With ultrashort laser pulses, a regime can be reached
in which all electrons are expelled, leaving a single spherical ion bubble.
The electrostatic field provides a strong accelerating force as well as a centripetal radial force.
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MIPSE 2010.09.29 6
Synchrotron radiation from an undulator
A. Rousse, K. T. Phuoc, R. Shah, et al. Phys. Rev. Lett. 93, (2004)A. G. R. Thomas and K. Krushelnick. Phys. Plasmas 16, (2009)
pc /22
Undulation within the bubble
)2/( 2
http://www.psi.ch
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Introduction to Laser Wakefield Acceleration (LWFA) and radiation generation
Characterization of synchrotron radiation Radiography demonstration
MIPSE 2010.09.29 7
Overview
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MIPSE 2010.09.29 8
LWFA undulator at UM
S. Kneip, C. McGuffey, J. L. Martins, et al. accepted to Nat. Phys.
Radiation collimated in 11 mrad beam
Radiographs resolve features as thin as 5 µm
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MIPSE 2010.09.29 9
LWFA undulator at UM
S. Kneip, C. McGuffey, J. L. Martins, et al. accepted to Nat. Phys.
Peak spectral brilliance is 1023 ph/s/mrad2/mm2/0.1%BW due to high degree of collimation and assumed 30 fs duration
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MIPSE 2010.09.29 10
LWFA undulator at UM
S. Kneip, C. McGuffey, J. L. Martins, et al. accepted to Nat. Phys.
Cleaved crystal casts shadow on detector
Source size can be determined by steepness of shadow
Best fit to 2.1±0.7 µm HWHM source size
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Introduction to Laser Wakefield Acceleration (LWFA) and radiation generation
Characterization of synchrotron radiation Radiography demonstration
MIPSE 2010.09.29 11
Overview
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MIPSE 2010.09.29 12
Yellowjacket Radiograph
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MIPSE 2010.09.29 13
Damselfly Radiograph
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LWFA can merge a ~100m accelerator + ~m undulator into a single ~cm stage.
X-ray peak brilliance is comparable to existing accelerator facilities.
Radiographs demonstrate phase-contrast imaging, few μm features resolved.
This source cannot compete with the rep-rate or scale of a user facility accelerator, but could be useful for university or single-user facilities.
MIPSE 2010.09.29 14
Summary