Refluxing of fast electrons in solid targets irradiated by intense, picosecond laser pulses

M. N. Quinn, X. H. Yuan, X. X. Lin, D. C. Carroll, O. Tresca, R. J. Gray, M. Coury, C. Li, Y. T. Li, C. M. Brenner, A. P. L. Robinson, D. Neely, B. Zielbauer, B. Aurand, J. Fils, T. Kuehl, P. McKenna

Research output: Contribution to journalArticle

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Abstract

The propagation of fast electrons produced in the interaction of relativistically intense, picosecond laser pulses with solid targets is experimentally investigated using K-alpha emission as a diagnostic. The role of fast electron refluxing within the target, which occurs when the electrons are reflected by the sheath potentials formed at the front and rear surfaces, is elucidated. The targets consist of a Cu fluorescence layer of fixed thickness at the front surface backed with a propagation layer of CH, the thickness of which is varied to control the number of times the refluxing fast electron population transits the Cu fluorescence layer. Enhancements in the K-alpha yield and source size are measured as the thickness of the CH layer is decreased. Comparison with analytical and numerical modelling confirms that significant refluxing occurs and highlights the importance of considering this phenomenon when deriving information on fast electron transport from laser-solid interaction experiments involving relatively thin targets.

LanguageEnglish
Number of pages12
JournalPlasma Physics and Controlled Fusion
Volume53
Issue number2
DOIs
Publication statusPublished - Feb 2011

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Laser pulses
Electrons
pulses
lasers
electrons
Fluorescence
Solid state lasers
methylidyne
fluorescence
propagation
transit
sheaths
interactions
augmentation
Experiments

Keywords

  • proton acceleration
  • plasma transport

Cite this

Quinn, M. N. ; Yuan, X. H. ; Lin, X. X. ; Carroll, D. C. ; Tresca, O. ; Gray, R. J. ; Coury, M. ; Li, C. ; Li, Y. T. ; Brenner, C. M. ; Robinson, A. P. L. ; Neely, D. ; Zielbauer, B. ; Aurand, B. ; Fils, J. ; Kuehl, T. ; McKenna, P. / Refluxing of fast electrons in solid targets irradiated by intense, picosecond laser pulses. In: Plasma Physics and Controlled Fusion. 2011 ; Vol. 53, No. 2.
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abstract = "The propagation of fast electrons produced in the interaction of relativistically intense, picosecond laser pulses with solid targets is experimentally investigated using K-alpha emission as a diagnostic. The role of fast electron refluxing within the target, which occurs when the electrons are reflected by the sheath potentials formed at the front and rear surfaces, is elucidated. The targets consist of a Cu fluorescence layer of fixed thickness at the front surface backed with a propagation layer of CH, the thickness of which is varied to control the number of times the refluxing fast electron population transits the Cu fluorescence layer. Enhancements in the K-alpha yield and source size are measured as the thickness of the CH layer is decreased. Comparison with analytical and numerical modelling confirms that significant refluxing occurs and highlights the importance of considering this phenomenon when deriving information on fast electron transport from laser-solid interaction experiments involving relatively thin targets.",
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author = "Quinn, {M. N.} and Yuan, {X. H.} and Lin, {X. X.} and Carroll, {D. C.} and O. Tresca and Gray, {R. J.} and M. Coury and C. Li and Li, {Y. T.} and Brenner, {C. M.} and Robinson, {A. P. L.} and D. Neely and B. Zielbauer and B. Aurand and J. Fils and T. Kuehl and P. McKenna",
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Quinn, MN, Yuan, XH, Lin, XX, Carroll, DC, Tresca, O, Gray, RJ, Coury, M, Li, C, Li, YT, Brenner, CM, Robinson, APL, Neely, D, Zielbauer, B, Aurand, B, Fils, J, Kuehl, T & McKenna, P 2011, 'Refluxing of fast electrons in solid targets irradiated by intense, picosecond laser pulses' Plasma Physics and Controlled Fusion, vol. 53, no. 2. https://doi.org/10.1088/0741-3335/53/2/025007

Refluxing of fast electrons in solid targets irradiated by intense, picosecond laser pulses. / Quinn, M. N.; Yuan, X. H.; Lin, X. X.; Carroll, D. C.; Tresca, O.; Gray, R. J.; Coury, M.; Li, C.; Li, Y. T.; Brenner, C. M.; Robinson, A. P. L.; Neely, D.; Zielbauer, B.; Aurand, B.; Fils, J.; Kuehl, T.; McKenna, P.

In: Plasma Physics and Controlled Fusion, Vol. 53, No. 2, 02.2011.

Research output: Contribution to journalArticle

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AB - The propagation of fast electrons produced in the interaction of relativistically intense, picosecond laser pulses with solid targets is experimentally investigated using K-alpha emission as a diagnostic. The role of fast electron refluxing within the target, which occurs when the electrons are reflected by the sheath potentials formed at the front and rear surfaces, is elucidated. The targets consist of a Cu fluorescence layer of fixed thickness at the front surface backed with a propagation layer of CH, the thickness of which is varied to control the number of times the refluxing fast electron population transits the Cu fluorescence layer. Enhancements in the K-alpha yield and source size are measured as the thickness of the CH layer is decreased. Comparison with analytical and numerical modelling confirms that significant refluxing occurs and highlights the importance of considering this phenomenon when deriving information on fast electron transport from laser-solid interaction experiments involving relatively thin targets.

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