Development of Spectral and Atomic Models for Diagnosing Energetic Particle Characteristics in Fast Ignition Experiments

Award Information
Agency: Department of Energy
Branch: N/A
Contract: DE-FG02-05ER86258
Agency Tracking Number: 79780B05-I
Amount: $750,000.00
Phase: Phase II
Program: STTR
Awards Year: 2006
Solicitation Year: 2005
Solicitation Topic Code: 34
Solicitation Number: DOE/SC-0075
Small Business Information
455 Science Drive, Suite 1, Madison, WI, 53711
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Joseph MacFarlane
 Dr.
 (608) 280-9179
 jjm@prism-cs.com
Business Contact
 Joseph MacFarlane
Title: Dr.
Phone: (608) 280-9179
Email: jjm@prism-cs.com
Research Institution
 University of Nevada - Reno
 Cindy Kiel
 Sponsored Projects
204 Ross Hall
Reno, NV, 89557
 (775) 784-4040
 Nonprofit college or university
Abstract
In the fast ignition concept for inertial fusion energy, high-intensity short-pulse lasers are used to create energetic particles (protons and relativistic electrons) that propagate to the fuel within a compressed capsule. The efficient transport of these energetic particles to the fuel is a key issue in fast ignition research. A combination of well-diagnosed experiments and well-tested simulation tools are needed in order to understand energetic particle transport through dense plasmas, a prerequisite for fast ignition to become a viable option for inertial fusion. This project will develop and apply spectral and atomic physics models, used in concert with a particle-in-cell (PIC) code, to simulate diagnostic signatures associated with energetic particle transport in short-pulse laser experiments. The developed models will be applied to fast-ignition-related short-pulse-laser experiments to characterize the properties of energetic electrons and protons. Phase I developed and benchmarked cross section models for energetic protons and relativistic electrons, and utilized them in a collisional-radiative code; developed an interface for post-processing simulation results; developed and initiated a plan to utilize more accurate ionization modeling in PIC code simulations; and performed proof-of-principal simulations relevant to short-pulse laser experiments. Phase II will: (1) develop diagnostics for characterizing energetic particle distributions based on polarization spectroscopy; (2) develop atomic physics modules for use within PIC codes; (3) implement high-fidelity, Stark-broadened line profiles in a multi-dimensional spectral analysis code, in order to provide accurate spectral diagnostics based on inner-shell transitions; and (4) benchmark the new models by comparison with well-diagnosed short-pulse laser experiments. Commercial Applications and other Benefits as described by the awardee: Beyond the application to fast ignition concepts for inertial fusion energy, powerful, user-friendly computational tools, capable of simulating the spectroscopic and atomic properties of laser-produced plasmas, should be applicable to radiation sources for EUV and x-ray lithography, plasma radiation sources used in defense research, magnetic fusion energy plasma diagnostics, materials plasma processing, and radiation sources developed for medical physics research and instrumentation.

* Information listed above is at the time of submission. *

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