Efficient quasi-monoenergetic ion beams from laser-driven relativistic plasmas

• Published in: Nature communications Vol. 6; no. 1; p. 10170
• Main Authors: Palaniyappan, Sasi, Huang, Chengkun, Gautier, Donald C., Hamilton, Christopher E., Santiago, Miguel A., Kreuzer, Christian, Sefkow, Adam B., Shah, Rahul C., Fernández, Juan C.
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 11.12.2015; Nature Publishing Group
• Subjects: 639/766/1960/1135; 639/766/1960/1137; 639/766/36; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; atomic and molecular physics; fluids and plasma physics; Humanities and Social Sciences; ion beam; laser; multidisciplinary; PARTICLE ACCELERATORS; physical sciences; plasma; Science; Science (multidisciplinary)
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/ncomms10170

Table-top laser–plasma ion accelerators have many exciting applications, many of which require ion beams with simultaneous narrow energy spread and high conversion efficiency. However, achieving these requirements has been elusive. Here we report the experimental demonstration of laser-driven ion beams with narrow energy spread and energies up to 18 MeV per nucleon and ∼5% conversion efficiency (that is 4 J out of 80-J laser). Using computer simulations we identify a self-organizing scheme that reduces the ion energy spread after the laser exits the plasma through persisting self-generated plasma electric (∼10 12  V m −1 ) and magnetic (∼10 4  T) fields. These results contribute to the development of next generation compact accelerators suitable for many applications such as isochoric heating for ion-fast ignition and producing warm dense matter for basic science. Table-top laser-plasma ion accelerators have many potential applications, but achieving simultaneous narrow energy spread and high efficiency remains a challenge. Here, the authors produce ion beams with up to 18 MeV per nucleon whilst keeping the energy spread reduced through a self-organized process.