Final Report for Subcontract# B539681
This report summarizes the work performed under subcontract B539681. The scope of work described in the subcontract encompasses studies of fundamental research for fast ignition. The work statement from the from the original subcontract and the subsequent extension can be summarized in three major components: modeling of electron transport in experimental targets, development of diagnostics, and experimental implementation and analysis. All three of these areas have been addressed during the subcontract period, although the tasks detailed in the original subcontract were adapted to research conditions with guidance from the technical contact. The work performed in each of these areas is described. (1) Modeling of electron transport in experimental targets - Electron transport and x-ray generation in experimental targets were modeled with the Monte Carlo code Integrated Tiger Series 3.0 (ITS 3.0). This code package was also used to model the response of Bremsstrahlung spectrometer described in the paper. The modeling helped with target and spectrometer designs and was also used to interpret the measured data from the experiments. this work is coupled to the diagnostic development and experimental analysis and is described in the deliverable of the report. (2) Diagnostic Development - During the subcontract period a filter-stack Bremsstrahlung spectrometer using image plate dosimeters was developed, tested, and calibrated. The spectrometer design and sample data taken with the spectrometer was presented at the High Temperature Plasma Diagnostics conference (Albuquerque, NM 2008). The information was also subsequently published in the peer-reviewed conference proceedings (rev. Sci. Instrum. 79:10E305 (2008)). The diagnostic was fielded on over 10 experiments at the Jupiter Laser Facility at Lawrence Livermore and was also adapted for use on OMEGA EP, was discussed in the subcontract extension. A composition study of the image plate dosimeters was also disseminated as an internal LLNL technical memo. In addition, research was performed into two other diagnostics. Single Photon Counting using a CCD (Single Hit Spectrometer) is a well-established technique in the literature. The subcontractor assisted with implementation and calibration of the Single Hit Spectrometer and developed general use software for analysis of the output data. This software is currently being used by a number of collaborators at Lawrence Livermore. The development of a Single Hit Imager was also initially explored at the beginning of the subcontract period but, under direction of the technical contact, not further pursued in order to focus on the other priorities. (3) Experimental Implementation and Analysis - The subcontractor participated in over 10 separate 2-8 week experiments at the Jupiter Laser Facility at Lawrence Livermore. On many of these experiments, the diagnostics described above were fielded to take x-ray measurements for different physics goals, including those described in the original subcontract and for studies of diagnostic related issues for the National Ignition Facility. A series of experiments were carried out on planar foil targets to study the electrons generated in the relativistic laser plasma interaction under fast ignition relevant conditions. The data was analyzed with the Monte Carlo modeling described above.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 966232
- Report Number(s):
- LLNL-SR-417769; TRN: US0903962
- Country of Publication:
- United States
- Language:
- English
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