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Thermonuclear fusion reactivity is a pivotal quantity in the studiespertaining to fusion energy production, fusion ignition and energy break-evenanalysis in both inertially and magnetically confined systems. Although nuclearfusion reactivity and thereafter the power density of a magnetic confinementfusion reactor and the fulfillment of the ignition criterion are quantitativelydetermined by assuming the ion speed distribution to be Maxwellian, asignificant population of suprathermal ions,with energy greater than thequasi-Maxwellian background plasma temperature, is generated by the fusionreactions and auxiliary heating in the fusion devices. In the current work3-parameter Dagum speed distribution has been introduced to include the effectof suprathermal ion population in the calculation of total fusion reactivity.The extent of enhancement in the fusion reactivity, at different back-groundtemperatures of the fusion fuel plasma, due to the suprathermal ion populationhas also been discussed.

Estimation of Total Fusion Reactivity and Contribution from Suprathermal Tail using 3-parameter Dagum Ion Speed Distribution