Deuterium<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Reaction

For interpreting fusion rate measurements in present fusion experiments and predicting the fusion performance of future devices or of d-t experiments in present devices, it is important to know the fusion crosssections as precisely as possible. Usually, it is not measured data that are used, but parametrizations of the crosssection as a function of the ion energy and parametrizations of the Maxwellian reactivity as a function of the ion temperature. Since the publication of the parametrizations now in use, new measurements have been made and evaluations of the measured data have been improved by applying R-matrix theory. The paper shows that the old parametrizations no longer adequately represent the experimental data and presents new parametrizations based on R-matrix calculations for fusion cross-sections and Maxwellian reactivities for the reactions D(d,r~)~He, D(d,p)T, T (~J)~H~ and 3He(d,p)4He.

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“…I Kunz (1955) The solution to this problem, however, comes from the R-matrix fit, as can be seen in Fig. 8.…”

Section: Data For the Reaction 3he(dp)4hementioning

confidence: 99%

Improved formulas for fusion cross-sections and thermal reactivities

1992

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“…The energy dependence of the cross section a(\ v o -v\) may be approximated either by direct interpolation of the experimental data (Kunz 1955;Conner et al 1952;Bonner et al 1952) or by using one of any fitting functions (for example Miley et al 1974) with sufficient accuracy. The energy dependence of the cross section a(\ v o -v\) may be approximated either by direct interpolation of the experimental data (Kunz 1955;Conner et al 1952;Bonner et al 1952) or by using one of any fitting functions (for example Miley et al 1974) with sufficient accuracy.…”

Section: Theory Of Secondary Reaction Yieldsmentioning

confidence: 99%

Review of secondary and tertiary reactions, and neutron scattering as diagnostic techniques for inertial confinement fusion targets

1991

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Fuel areal density,

, is a fundamental quantity for ICF implosions. For current and future targets, areal densities are large enough that a variety of neutron based diagnostic techniques can be used to determine fuel (pR). These include measurements based on the secondary production of DT neutrons from initially pure deuterium fuel and, for higher (pR) values, techniques utilizing high energy tertiary neutrons or lower energy scattered neutrons. This paper describes these techniques and gives an overview of the current experimental status.

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“…groups (Bonner, Conner, and Lillie, 18 and Arnold et al 4 ) also measured the 3 He(d,p) 4 He reaction. In a subsequent experiment in the low-energy region, Kunz 19 disagrees with the above data. He had an energy shift from 5-15 keV higher, so his crosssection values are 30-50% lower than the previous work.…”

Section: B 3 He(dp) 4 He and 6 Li(p 3 He) 4 Hementioning

confidence: 54%

Low-energy nuclear fusion data and their relation to magnetic and laser fusion

Jarmie¹

1980

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We investigated the accuracy of the basic fusion data for the T(d,n) 4 He, 3 He(d,p) 4 He, T(t,2n) 4 He, D(d,n) 3 He, and D(d,p)T reactions in the 10-to 100 keV bombarding energy region, and assessed the effects of inaccuracies on the design of fusion reactors. The data base for these reactions | particularly the most critical T(d,n) 4 He reaction] rests on 25-year-old experiments whose accuracy (often assumed to be ±5%) has rarely been questioned: yet in all except the d + d reactions, there are significant differences among data set". The errors in the basic data sets may be considerably larger than previously expected, and the effect on design calculations should be significant. Much of the trouble apparently lies in the accuracy of the energy measurements, which are difficult at low energies. Systemptic erroi s of up to 50% are possible in the reactivity values )f the present Tfd.n^He data base. The error, n. me reactivity will propagate proportionately into the errors in fusion probabilities in reactor calculations. 3 He(d,p) 4 He reaction cross sections could be in error by as much as 50% in the low-energy region. The D(d,n) 3 He and D(d,p)T cross sections appear to be well known and consistent. The T(t,2n) 4 He cross section is poorly known and may be subject to large systematic errors. Improved absolute measurements for all the reactions in the low bombarding energy region

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DeuteriumHe3Reaction

Cited by 64 publications

References 13 publications

Improved formulas for fusion cross-sections and thermal reactivities

Improved formulas for fusion cross-sections and thermal reactivities

Review of secondary and tertiary reactions, and neutron scattering as diagnostic techniques for inertial confinement fusion targets

Low-energy nuclear fusion data and their relation to magnetic and laser fusion

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