Abstract Details

Revisiting the physics basis for the GDT neutron source

Author: Dmitri D Ryutov
Submitted: 2005-12-20 20:38:28

Co-authors: D.N. Hill, J.F. Latkowski, W.R. Meier

Contact Info:
Lawrence Livermore National Laboratory
7000 East Avenue
Livermore, CA   94551
USA

Abstract Text:
The neutron source based on the Gas Dynamic Trap, depending on the specifics of its design, would produce a neutron flux of uncollided 14 MeV neutrons of 1 to 4 MW/m2 in a test volume of 50 to 300 liters. Its advantages are (see, e.g., [1] and references therein): 1) Correct neutron spectrum; 2) Small tritium consumption; 3) Low neutron and heat loads outside the test zones (long life-time of the source); 4) Simple design (low cost); 5) Reliance on the existing technologies (except for the DC neutral beam injectors which are under development in conjunction with other fusion projects); 6) The possibility of staged construction/operation.

The volume available is sufficient for testing critical sub-components of the future fusion reactors, like, e.g., blanket cassettes, joints and welds, cooling manifolds, etc, as well as for the material tests.

We discuss the critical issues related to the source performance: the axial electron heat loss; MHD stability in an axisymmetric geometry; the radial uniformity of the neutron flux. We base our assessment on the results obtained during the last year both in theory [2], experiment (carried out by the Novosibirsk group, [3]), and analysis of the neutron fluxes. We conclude that there is a good chance that the source, if built, will reach the projected parameters.

This work was performed under the auspices of the U.S. Department of Energy by University of California Lawrence Livermore national Laboratory under contract No. W-7405-Eng-48.

1. D.D. Ryutov, D.E. Baldwin, E.B. Hooper, and K.I. Thomassen. “A high-flux source of fusion neutrons for material and component testing�, J. Fusion Energy, 17, 253 (1998).
2. D.D. Ryutov. “Axial electron heat losses from mirror devices revisited.� Transactions of Fusion Science and Technology. 47, 148-154 (2005).
3. V.V. Prikhodko et al. “Formation of a narrow radial profile of fast ions in the GDT device.� Plasma Phys. Rep., 31, 899 (2005).

Characterization: A1,A4

Comments:

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