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Title: Intense Pulsed Neutron Emission from a Compact Pyroelectric Driven Accelerator

Intense pulsed D-D neutron emission with rates >10{sup 10} n/s during the pulse, pulse widths of {approx}100's ns, and neutron yields >10 k per pulse are demonstrated in a compact pyroelectric accelerator. The accelerator consists of a small pyroelectric LiTaO{sub 3} crystal which provides the accelerating voltage and an independent compact spark plasma ion source. The crystal voltage versus temperature is characterized and compare well with theory. Results show neutron output per pulse that scales with voltage as V{approx}1.7. These neutron yields match a simple model of the system at low voltages but are lower than predicted at higher voltages due to charge losses not accounted for in the model. Interpretation of the data against modeling provides understanding of the accelerator and in general pyroelectric LiTaO{sub 3} crystals operated as charge limited negative high voltage targets. The findings overall serve as the proof-of-principle and basis for pyroelectric neutron generators that can be pulsed, giving peak neutron rates orders of magnitude greater than previous work, and notably increase the potential applications of pyroelectric based neutron generators.
Authors:
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Publication Date:
OSTI Identifier:
947245
Report Number(s):
LLNL-JRNL-407763
Journal ID: ISSN 0021-8979; JAPIAU; TRN: US0901835
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics, vol. 105, no. 2, January 26, 2009, pp. 026103; Journal Volume: 105; Journal Issue: 2
Research Org:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 22 GENERAL STUDIES OF NUCLEAR REACTORS; ACCELERATORS; ION SOURCES; NEUTRON EMISSION; NEUTRON GENERATORS; NEUTRONS