C. McGuffey a, W. Schumaker a, S. Kneip b, F. Dollar a, A. Maksimchuk a, A. G. R. Thomas a, and K. Krushelnick a (a) University of Michigan, Center for.

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Presentation transcript:

C. McGuffey a, W. Schumaker a, S. Kneip b, F. Dollar a, A. Maksimchuk a, 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 seminar

MIPSE  Linac Coherent Light Source (SLAC) ◦ 3 km total length ◦ $379M upgrade ◦ 100 fs x-ray 120 Hz ◦ up to 8 keV  Advanced Photon Source (ANL) ◦ Spectral brightness 5x10 19 photons/s/mm 2 /mrad 2 /0.1%BW up to 40 keV  Advanced Light Source (LBNL)  Diamond (U.K.)  European Synchrotron Radiation Facility (France) lcls.slac.standford.edu

 Introduction to Laser Wakefield Acceleration (LWFA) and radiation generation  Characterization of synchrotron radiation  Radiography demonstration MIPSE

MIPSE  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 Color indicates electron density e-e-

MIPSE  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.

MIPSE 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)

 Introduction to Laser Wakefield Acceleration (LWFA) and radiation generation  Characterization of synchrotron radiation  Radiography demonstration MIPSE

MIPSE 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

MIPSE S. Kneip, C. McGuffey, J. L. Martins, et al. accepted to Nat. Phys.  Peak spectral brilliance is ph/s/mrad 2 /mm 2 /0.1%BW due to high degree of collimation and assumed 30 fs duration

MIPSE 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

 Introduction to Laser Wakefield Acceleration (LWFA) and radiation generation  Characterization of synchrotron radiation  Radiography demonstration MIPSE

MIPSE

MIPSE

 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