Laboratory astroparticle physics

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Measuring fast electron distribution functions at intensities up to 1021 W cm-2

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2011)

Authors:

N Booth, RJ Clarke, D Doria, LA Gizzi, G Gregori, P Hakel, P Koester, L Labate, T Levato, B Li, M Makita, RC Mancini, J Pasley, PP Rajeev, D Riley, APL Robinson, E Wagenaars, JN Waugh, NC Woolsey
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Onset of Negative Dispersion in the One-Component Plasma

INTERNATIONAL TOPICAL CONFERENCE ON PLASMA SCIENCE: STRONGLY COUPLED ULTRA-COLD AND QUANTUM PLASMAS 1421 (2011)

Authors:

JP Mithen, J Daligault, G Gregori
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Ultrafast melting of carbon induced by intense proton beams

Physical Review Letters 105:26 (2010)

Authors:

A Pelka, G Gregori, DO Gericke, J Vorberger, SH Glenzer, MM Günther, K Harres, R Heathcote, AL Kritcher, NL Kugland, B Li, M Makita, J Mithen, D Neely, C Niemann, A Otten, D Riley, G Schaumann, M Schollmeier, A Tauschwitz, M Roth

Abstract:

Laser-produced proton beams have been used to achieve ultrafast volumetric heating of carbon samples at solid density. The isochoric melting of carbon was probed by a scattering of x rays from a secondary laser-produced plasma. From the scattering signal, we have deduced the fraction of the material that was melted by the inhomogeneous heating. The results are compared to different theoretical approaches for the equation of state which suggests modifications from standard models. © 2010 The American Physical Society.
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New onomastic for Brix

Epigraphica 72 (2010) 451-454

Authors:

A Breda, GL Gregori

X-ray polarization measurements of dense plasmas heated by fast electrons

AIP Conference Proceedings 1228 (2010) 79-85

Authors:

N Booth, RJ Clarke, P Gallegos, LA Gizzi, G Gregori, P Koester, L Labate, T Levato, B Li, M Makita, J Pasley, PP Rajeev, D Riley, E Wagenaars, JN Waugh, NC Woolsey

Abstract:

The detailed knowledge of fast electron energy transport following interaction with high-intensity, ultra-short laser pulses is a key area for secondary source generation for ELI. We demonstrate polarization spectroscopy at laser intensities up to 1021 Wcm-2. This is significant as it suggests that in situ emission spectroscopy may be used as an effective probe of fast electron velocity distributions in regimes relevant to electron transport in solid targets. Ly-α doublet emission of nickel (Z = 28) and sulphur (Z = 16) is observed to measure the degree of polarization from the Ly-α1 emission. Ly-α2 emission is unpolarized, and as such acts as a calibration source between spectrometers. The measured ratio of the X-ray σ-and π-polarization allows the possibility to infer the velocity distribution function of the fast electron beam. © 2010 American Institute of Physics.
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