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Focussing Protons from a Kilojoule Laser for Intense Beam Heating using Proximal Target Structures.

C McGuffey1, J Kim2, M S Wei3

  • 1Center for Energy Research, University of California, San Diego, La Jolla, CA, 92093-0417, USA. cmcguffey@ucsd.edu.

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Summary
This summary is machine-generated.

Chirped pulse amplified lasers generate multi-picosecond proton beams for heating materials. Structured targets focus these beams, significantly enhancing X-ray emission for warm dense matter research and fusion energy applications.

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Area of Science:

  • Plasma Physics
  • Laser-driven particle acceleration
  • Materials Science

Background:

  • Chirped pulse amplified (CPA) lasers produce multi-picosecond proton beams capable of isochoric and volumetric heating.
  • These beams offer a potential pathway for creating warm dense matter (WDM) and achieving fusion ignition.

Purpose of the Study:

  • To investigate the effectiveness of kilojoule-class, multi-picosecond lasers for material heating.
  • To demonstrate enhanced proton beam focusing using target design for high-flux applications.
  • To explore the creation of WDM conditions and potential fusion fuel heating.

Main Methods:

  • Laser irradiation of spherically curved diamond-like-carbon targets at intensities of 4 × 10^18 W/cm^2.
  • Utilizing a Copper (Cu) witness foil to measure Kα fluorescence emission.
  • Employing transverse proton radiography for high-resolution probing of electric fields.
  • Conducting particle-in-cell (PIC) simulations to model proton focusing mechanisms.

Main Results:

  • Proton beams with a 3 MeV slope temperature were generated.
  • Structured targets increased Cu Kα fluorescence emission by 18-fold, indicating a tightly focused beam.
  • Proton radiography revealed fast-acting electric fields responsible for focusing.
  • PIC simulations confirmed that target structures funnel protons to a tight focus.
  • Copper was heated to 100 eV by the proton and electron beams.

Conclusions:

  • Kilojoule-class, multi-picosecond CPA lasers are effective for heating materials.
  • Target design, specifically using structures, can significantly enhance proton beam focusing and flux.
  • This technique shows promise for WDM research and inertial confinement fusion applications.