A
A. Machacek
Researcher at University of Oxford
Publications - 16
Citations - 2244
A. Machacek is an academic researcher from University of Oxford. The author has contributed to research in topics: Laser & Plasma. The author has an hindex of 11, co-authored 16 publications receiving 2150 citations.
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Journal ArticleDOI
Measurements of energetic proton transport through magnetized plasma from intense laser interactions with solids
E.L. Clark,Karl Krushelnick,J. R. Davies,Matthew Zepf,Michael Tatarakis,Farhat Beg,A. Machacek,Peter Norreys,M. I. K. Santala,I. Watts,A. E. Dangor +10 more
TL;DR: In this paper, up to 10(12) protons with energies greater than 2 MeV were observed to propagate through a 125 mm thick aluminum target and measurements of their angular deflection were made.
Journal ArticleDOI
Energetic heavy-ion and proton generation from ultraintense laser-plasma interactions with solids
E.L. Clark,Karl Krushelnick,Matthew Zepf,Farhat Beg,Michael Tatarakis,A. Machacek,M. I. K. Santala,I. Watts,Peter Norreys,A. E. Dangor +9 more
TL;DR: Observations of proton emission indicate significant structure in the energy spectrum as well as an angular emission profile which varies with energy.
Journal ArticleDOI
Photonuclear physics when a multiterawatt laser pulse interacts with solid targets
Kenneth W. D. Ledingham,I. Spencer,T. McCanny,Ravi P. Singhal,M. I. K. Santala,Edward B. Clark,I. Watts,Farhat Beg,Matthew Zepf,Karl Krushelnick,Michael Tatarakis,A. E. Dangor,Peter Norreys,Ric M. Allott,D. Neely,R. J. Clark,A. Machacek,Justin Wark,Alan J. Cresswell,David C.W. Sanderson,J. Magill +20 more
TL;DR: Laser-induced nuclear fission in 238U has been demonstrated, a process which was theoretically predicted at such laser intensities more than ten years ago.
Journal ArticleDOI
Effect of the plasma density scale length on the direction of fast electrons in relativistic laser-solid interactions
M. I. K. Santala,Matthew Zepf,I. Watts,Farhat Beg,Edward B. Clark,Michael Tatarakis,Karl Krushelnick,A. E. Dangor,T. McCanny,I. Spencer,Ravi P. Singhal,Kenneth W. D. Ledingham,Scott Wilks,A. Machacek,Justin Wark,Ric M. Allott,R. J. Clarke,Peter Norreys +17 more
TL;DR: It is shown that the gamma-ray beam moves from the target normal to the direction of the k(laser) vector as the scale length is increased, similar behavior is found also in 2D particle-in-cell simulations.
Journal ArticleDOI
Observation of a highly directional γ-ray beam from ultrashort, ultraintense laser pulse interactions with solids
Peter Norreys,M. I. K. Santala,E.L. Clark,Matthew Zepf,I. Watts,F. N. Beg,Karl Krushelnick,Michael Tatarakis,A. E. Dangor,X. Fang,P. Graham,T. McCanny,Ravi P. Singhal,K.W.D. Ledingham,Alan Creswell,David C.W. Sanderson,J. Magill,A. Machacek,Justin Wark,Ric M. Allott,B. Kennedy,D. Neely +21 more
TL;DR: In this article, a bright, highly directional source of γ rays was observed directly behind the target, which were produced by bremsstrahlung radiation from energetic electrons generated during the interaction.