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Title: Laser acceleration of protons using multi-ion plasma gaseous targets

We present a theoretical and numerical study of a novel acceleration scheme by applying a combination of laser radiation pressure and shielded Coulomb repulsion in laser acceleration of protons in multi-species gaseous targets. By using a circularly polarized CO₂ laser pulse with a wavelength of 10 μm—much greater than that of a Ti: Sapphire laser—the critical density is significantly reduced, and a high-pressure gaseous target can be used to achieve an overdense plasma. This gives us a larger degree of freedom in selecting the target compounds or mixtures, as well as their density and thickness profiles. By impinging such a laser beam on a carbon–hydrogen target, the gaseous target is first compressed and accelerated by radiation pressure until the electron layer disrupts, after which the protons are further accelerated by the electron-shielded carbon ion layer. An 80 MeV quasi-monoenergetic proton beam can be generated using a half-sine shaped laser beam with a peak power of 70 TW and a pulse duration of 150 wave periods.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ; ;  [3] ;  [4]
  1. Univ. of Maryland, College Park, MD (United States)
  2. Univ. of Maryland, College Park, MD (United States); Strathclyde Univ., Glasgow (United Kingdom)
  3. Academia Sinica, Taipei (Taiwan). Institute of Atomic and Molecular Sciences; National Central Univ., Taoyuan (Taiwan)
  4. National Central Univ., Taoyuan (Taiwan)
Publication Date:
OSTI Identifier:
1193635
Grant/Contract Number:
SC0008391
Type:
Accepted Manuscript
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 17; Journal Issue: 2; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Research Org:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS laser-plasma acceleration of electrons and ions; particle-in-cell method; laser-plasma interactions; relativistic plasmas