Neutron Production from Feedback Controlled Thermal Cycling of a Pyroelectric Crystal Stack

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The LLNL Crystal Driven Neutron Source is operational and has produced record ion currents of {approx}10 nA and neutron output of 1.9 ({+-}0.3) x 10{sup 5} per thermal cycle using a crystal heating rate of 0.2 C/s from 10 C to 110 C. A 3 cm diameter by 1 cm thick LiTaO{sub 3} crystal with a socket secured field emitter tip is thermally cycled with feedback control for ionization and acceleration of deuterons onto a deuterated target to produce D-D fusion neutrons. The entire crystal and temperature system is mounted on a bellows which allows movement of the crystal along ... continued below

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PDF-file: 15 pages; size: 0.4 Mbytes

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Tang, V; Meyer, G; Schmid, G; Spadaccini, C; Kerr, P; Rusnak, B et al. August 9, 2007.

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The LLNL Crystal Driven Neutron Source is operational and has produced record ion currents of {approx}10 nA and neutron output of 1.9 ({+-}0.3) x 10{sup 5} per thermal cycle using a crystal heating rate of 0.2 C/s from 10 C to 110 C. A 3 cm diameter by 1 cm thick LiTaO{sub 3} crystal with a socket secured field emitter tip is thermally cycled with feedback control for ionization and acceleration of deuterons onto a deuterated target to produce D-D fusion neutrons. The entire crystal and temperature system is mounted on a bellows which allows movement of the crystal along the beam axis and is completely contained on a single small vacuum flange. The modular crystal assembly permitted experimental flexibility. Operationally, flashover breakdowns along the side of the crystal and poor emitter tip characteristics can limit the neutron source. The experimental neutron results extend earlier published work by increasing the ion current and pulse length significantly to achieve a factor-of-two higher neutron output per thermal cycle. These findings are reviewed along with details of the instrument.

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PDF-file: 15 pages; size: 0.4 Mbytes

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  • Journal Name: Review of Scientific Instruments, vol. 78, no. 12, December 26, 2007, pp. 123504; Journal Volume: 78; Journal Issue: 12

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  • Report No.: UCRL-JRNL-233604
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 925994
  • Archival Resource Key: ark:/67531/metadc898832

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • August 9, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 30, 2016, 12:48 p.m.

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Tang, V; Meyer, G; Schmid, G; Spadaccini, C; Kerr, P; Rusnak, B et al. Neutron Production from Feedback Controlled Thermal Cycling of a Pyroelectric Crystal Stack, article, August 9, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc898832/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.