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Title: Generation of Superponderomotive Electrons in Multipicosecond Interactions of Kilojoule Laser Beams with Solid-Density Plasmas

Journal Article · · Physical Review Letters
 [1];  [2];  [1];  [1];  [3];  [4];  [5];  [1]
  1. Univ. of California, San Diego, CA (United States)
  2. Univ. of Texas, Austin, TX (United States)
  3. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL)
  4. General Atomics, San Diego, CA (United States)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

The interaction of a multipicosecond, kilojoule laser pulse with a surface of a solid target has been demonstrated to produce electrons with energies far beyond the free-electron ponderomotive limit $$m_{e}c^{2}a^{2}_{0}$$/2. Particle-in-cell simulations suggest that an increase in the pulse duration from 1 to 10 ps leads to the formation of a low-density shelf (about 10% of the critical density). The shelf extends over 100 μm toward the vacuum side, with a nonstationary potential barrier forming in that area. Electrons reflected from the barrier gain superponderomotive energy from the potential. Some electrons experience an even greater energy gain due to ponderomotive acceleration when their “dephasing rate” $$R = γ – p_{x}/m_{e}c$$ drops well below unity, thus increasing acceleration by a factor of 1/$$R$$. Furthermore, both 1D and 2D simulations indicate that these mechanisms are responsible for the generation of extensive thermal distributions with $$T_{e}$$ > 10 MeV and a high-energy cutoff of hundreds of MeV.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
AC52-07NA27344; NA0000870; FG02-05ER54834; FC02-04ER54789; NA0002008; FG02-04ER54742; FG02- 04ER54742
OSTI ID:
1579609
Alternate ID(s):
OSTI ID: 1247076
Report Number(s):
LLNL-JRNL-799339; PRLTAO; 833827; TRN: US2102233
Journal Information:
Physical Review Letters, Vol. 116, Issue 15; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 39 works
Citation information provided by
Web of Science

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Cited By (29)

Particle-in-cell simulations of laser–plasma interactions at solid densities and relativistic intensities: the role of atomic processes journal January 2018
Plasma density limits for hole boring by intense laser pulses journal February 2018
Time-resolved measurements of fast electron recirculation for relativistically intense femtosecond scale laser-plasma interactions journal March 2018
Electromagnetic field growth triggering super-ponderomotive electron acceleration during multi-picosecond laser-plasma interaction journal August 2019
Universal scalings for laser acceleration of electrons in ion channels journal October 2016
Breaking of dynamical adiabaticity in direct laser acceleration of electrons journal February 2017
Interaction of an electron with coherent dipole radiation: Role of convergence and anti-dephasing journal May 2018
Computational modeling of proton acceleration with multi-picosecond and high energy, kilojoule, lasers journal August 2018
First demonstration of ARC-accelerated proton beams at the National Ignition Facility journal April 2019
On the non-thermal nature of distributions of electrons accelerated by high intensity lasers at the vacuum-plasma interface journal August 2019
Laser reflection as a catalyst for direct laser acceleration in multipicosecond laser-plasma interaction journal January 2020
The controllable electron-heating by external magnetic fields at relativistic laser-solid interactions in the presence of large scale pre-plasmas journal April 2017
Extremely intense laser-based electron acceleration in a plasma channel journal January 2018
Effects of resistive magnetic instability and electron refluxing on fast electron dynamics and bremsstrahlung radiation characteristics in relativistic laser-solid interaction journal August 2019
Plasma expansion accompanying superthermal electrons in over-picosecond relativistic laser-foil interactions journal October 2019
Enhanced proton acceleration in an applied longitudinal magnetic field journal October 2016
Investigation of laser pulse length and pre-plasma scale length impact on hot electron generation on OMEGA-EP journal February 2017
The unexpected role of evolving longitudinal electric fields in generating energetic electrons in relativistically transparent plasmas journal September 2018
High-flux high-energy ion beam production from stable collisionless shock acceleration by intense petawatt-picosecond laser pulses journal March 2019
Proton beam emittance growth in multipicosecond laser-solid interactions journal October 2019
Energy absorption and coupling to electrons in the transition from surface- to volume-dominant intense laser–plasma interaction regimes journal May 2020
Broadening of cyclotron resonance conditions in the relativistic interaction of an intense laser with overdense plasmas journal October 2017
Particle-in-cell simulations of laser–plasma interactions at solid densities and relativistic intensities: the role of atomic processes text January 2018
Energy absorption and coupling to electrons in the transition from surface- to volume-dominant intense laser–plasma interaction regimes text January 2020
Universal scalings for laser acceleration of electrons in ion channels text January 2016
Enhanced proton acceleration in an applied longitudinal magnetic field text January 2016
Broadening of Cyclotron Resonance Conditions in the Relativistic Interaction of an Intense Laser with Overdense Plasmas text January 2017
The Unexpected Role of Evolving Longitudinal Electric Fields in Generating Energetic Electrons in Relativistically Transparent Plasmas text January 2018
High-angle Deflection of the Energetic Electrons by a Voluminous Magnetic Structure in Near-normal Intense Laser-plasma Interactions text January 2018

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