Why a D-D reaction in the Divertor Tokamak Test Facility?

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SUMMARY

The D-D reaction is chosen for the Divertor Tokamak Test Facility (DTT) in Frascati, Italy, due to its smaller cross section compared to the D-T reaction and the lower energy of emitted neutrons. This selection significantly impacts heat and particle exhaust management in the divertor, which primarily experiences ion bombardment from the plasma. The DTT is designed as a divertor test facility and will not engage in significant fusion reactions, making deuterium a more manageable option than tritium.

PREREQUISITES
  • Understanding of fusion reactions, specifically D-D and D-T reactions.
  • Knowledge of plasma physics and its interaction with divertors.
  • Familiarity with heat and particle exhaust systems in tokamak designs.
  • Basic principles of neutron behavior in fusion environments.
NEXT STEPS
  • Research the impact of neutron energy on divertor materials in fusion reactors.
  • Explore the design and operational principles of divertor test facilities.
  • Study the differences between D-D and D-T fusion reactions in detail.
  • Investigate the challenges of tritium handling in fusion environments.
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Researchers, engineers, and physicists involved in fusion energy development, particularly those focusing on tokamak design and divertor technology.

Giuliavaleria
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The DTT project proposal talks about a D-D reaction inside the future tokamak that is going to be built in Italy, Frascati. Which is the reason of this choise? The cross section is smaller than the D-T reaction one, and neutrons are less energetic. How this influences heat and particle exhaust on the divertor? and how does the heat flux changes?
Thanks
 
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It is a divertor test facility. The divertor is mainly hit by ions from the plasma. While it is also hit by some neutrons that plays a smaller role. The DTT won't have any relevant fusion as far as I understand.

Tritium is more difficult to work with, unless there is a strong reason to do so operation with deuterium is easier.
 

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