Laser and Particle Beams



Laser-ablation treatment of short-pulse laser targets: Toward an experimental program on energetic-ion interactions with dense plasmas a


JUAN C.  FERNÁNDEZ  a1 c1 , B. MANUEL  HEGELICH  a1 , JAMES A.  COBBLE  a1 , KIRK A.  FLIPPO  a1 , SAMUEL A.  LETZRING  a1 , RANDALL P.  JOHNSON  a1 , D. CORT  GAUTIER  a1 , TSUTOMU  SHIMADA  a1 , GEORGE A.  KYRALA  a1 , YONGQIANG  WANG  a1 , CHRIS J.  WETTELAND  a1 and JÖRG  SCHREIBER  a2
a1 Los Alamos National Laboratory, Los Alamos, New Mexico
a2 Max Planck Institute for Quantum Optics, Garching, Germany

Article author query
fernandez jc   [Google Scholar] 
hegelich bm   [Google Scholar] 
cobble ja   [Google Scholar] 
flippo ka   [Google Scholar] 
letzring sa   [Google Scholar] 
johnson rp   [Google Scholar] 
gautier dc   [Google Scholar] 
shimada t   [Google Scholar] 
kyrala ga   [Google Scholar] 
wang y   [Google Scholar] 
wetteland cj   [Google Scholar] 
schreiber j   [Google Scholar] 
 

Abstract

This new project relies on the capabilities collocated at Los Alamos in the Trident laser facility of long-pulse laser drive, for laser-plasma formation, and high-intensity short-pulse laser drive, for relativistic laser-matter interaction experiments. Specifically, we are working to understand quantitatively the physics that underlie the generation of laser-driven MeV/nucleon ion beams, in order to extend these capabilities over a range of ion species, to optimize beam generation, and to control those beams. Furthermore, we intend to study the interaction of these novel laser-driven ion beams with dense plasmas, which are relevant to important topics such as the fast-ignition method of inertial confinement fusion (ICF), weapons physics, and planetary physics. We are interested in irradiating metallic foils with the Trident short-pulse laser to generate medium to heavy ion beams (Z = 20–45) with high efficiency. At present, target-surface impurities seem to be the main obstacle to reliable and efficient acceleration of metallic ions in the foil substrate. In order to quantify the problem, measurements of surface impurities on typical metallic-foil laser targets were made. To eliminate these impurities, we resorted to novel target-treatment techniques such as Joule-heating and laser-ablation, using a long-pulse laser intensity of [similar] 1010 W/cm2. Our progress on this promising effort is presented in this paper, along with a summary of the overall project.

(Received November 30 2004)
(Accepted December 14 2004)


Key Words: Charped-particle sources; Ion beams; Laser-plasma acceleration; Laser-plasma interactions; Plasma-diagnostic techniques.

Correspondence:
c1 Address correspondence and reprint requests to: Juan C. Fernandez, Los Alamos National Laboratory, MS E526, Group P-24, Los Alamos, NM 87545. E-mail: juanc@lanl.gov


Footnotes

a This paper was presented at the 28th ECLIM conference in Rome, Italy.