Theoretical Understanding of Enhanced Proton Energies from Laser-Cone Interactions

Journal Article · Thu Nov 04 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3520418· OSTI ID:21428863

Kluge, T; Gaillard, S A; Bussmann, M; Burris-Mog, T; Kraft, S D; Metzkes, J; Rassuchine, J; Schramm, U; Zeil, K; Cowan, T E ^[1]; Flippo, K A; Offermann, D T ^[2]; Gall, B ^[3]; Geissel, M; Schollmeier, M ^[4]; Lockard, T; Sentoku, Y ^[5]

---

1. Forschungszentrum Dresden-Rossendorf e.V., D-01328 Dresden (Germany)
2. Los Alamos National Laboratory, Los Alamos, NM (United States)
3. University of Missouri, Columbia, MO (United States)
4. Sandia National Laboratories, Albuquerque, NM (United States)
5. University of Nevada, Reno, NV (United States)

For the past ten years, the highest proton energies accelerated with high-intensity lasers was 58 MeV, observed in 2000 at the LLNL NOVA Petawatt laser, using flat foil targets. Recently, 67.5 MeV protons were observed in experiments at the Los Alamos National Laboratory (LANL) Trident laser, using one-fifth of the PW laser pulse energy, incident into novel conical targets. We present a focused study of new theoretical understanding of this measured enhancement from collisional Particle-in-Cell simulations, which shows that the hot electron temperature, number and maximum energy, responsible for the Target Normal Sheath Acceleration (TNSA) at the cone-top, are significantly increased when the laser grazes the cone wall. This is mainly due to the extraction of electrons from the cone wall by the laser electric field, and their boost in the forward direction by the vxB term of the Lorentz force. This result is in contrast to previous predictions of optical collection and wall-guiding of electrons in angled cones. This new wall-grazing mechanism offers the prospect to linearly increase the hot electron temperature, and thereby the TNSA proton energy, by extending the length over which the laser interacts in a grazing fashion in suitably optimized targets. This may allow achieving much higher proton energies for interesting future applications, with smaller, lower energy laser systems that allow for a high repetition rate.

• OSTI ID: 21428863
• Journal Information: AIP Conference Proceedings, Vol. 1299, Issue 1; Conference: 14. advanced accelerator concepts workshop, Annapolis, MD (United States), 13-19 Jun 2010; Other Information: DOI: 10.1063/1.3520418; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
43 PARTICLE ACCELERATORS
ACCELERATION
BEAM PRODUCTION
BEAM-PLASMA SYSTEMS
COMPUTERIZED SIMULATION
ELECTRIC FIELDS
ELECTRON SPECTRA
ELECTRON TEMPERATURE
ELECTRONS
IONIZATION
LASER TARGETS
LASER-PRODUCED PLASMA
LASERS
LORENTZ FORCE
MEV RANGE
NOVA FACILITY
PETAWATT POWER RANGE
PROTONS
TRIDENT FACILITY
BARYONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
HADRONS
LEPTONS
NUCLEONS
PLASMA
POWER RANGE
SIMULATION
SPECTRA
TARGETS