Understanding Fusion Power: Deuterium & Tritium in Magnetic Confinement

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SUMMARY

This discussion focuses on the operation of fusion power, specifically the roles of deuterium and tritium in magnetic confinement using a tokamak. Deuterium and tritium are ionized to form plasma, which is confined by magnetic fields, with the strength of the magnetic field affecting the gyroradius of the ions and electrons. The initial neutral gas is rapidly heated using ohmic heating, and additional fuel is introduced via frozen pellets injected into the plasma. The amount of fuel required varies based on the expected output power of the fusion reactor.

PREREQUISITES
  • Understanding of magnetic confinement fusion principles
  • Knowledge of plasma physics and behavior
  • Familiarity with tokamak design and operation
  • Basic concepts of thermonuclear reactions
NEXT STEPS
  • Research the principles of tokamak design and operation
  • Learn about plasma confinement techniques in fusion reactors
  • Explore the process of fuel pellet injection in fusion systems
  • Investigate the impact of magnetic field strength on plasma stability
USEFUL FOR

Researchers, physicists, and engineers interested in fusion energy, particularly those focused on magnetic confinement and plasma behavior in tokamak reactors.

ozgurakkas
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I have been researching about fusion power to understand how it operates during thermonuclear reactions. I do not understand how and how much deuterium and tritium are placed into the magnetic confinement (tokomak). I appreciate it, if anyone guides me about this.

Thank you
 
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ozgurakkas said:
I have been researching about fusion power to understand how it operates during thermonuclear reactions. I do not understand how and how much deuterium and tritium are placed into the magnetic confinement (tokomak). I appreciate it, if anyone guides me about this.

Thank you
The deuterium and tritium are ionized to form a plasma, and the plasma (ions and electrons) are confined by the magnetic field. The plasma excludes the magnetic field, and the ions and electrons rotate or more accurately, spiral along the magnetic field lines. The stronger the magnetic field (greater line density), the small the gyroradius of the ions and electrons. Within the plasma, where the magnetic field is low or virtually non-existent, the ions and electrons would have very large gyroradii, but they also scatter off each other.

Basically in a torus, one starts with a neutral gas which is heated rapidly with a toroidal current (ohmic heating). That current is also subjected to an azimuthal magnetic field (caused by the toroidal current) which pushes inward on the current and then plasma, which forms as the neutral gas is heated by the current. Toroidal and poloidal magnetic fields are also applied for additional confinement and stability.
 
Additional fuel is proposed to be added in a reactor set up with fuel pellet injection. Frozen deuterium and tritium in small pellets are shot into the plasma through the magnetic field. Compared to what you experience daily, a plasma is not that dense, so there's actually much less fuel than what I expected. Exactly how much depends on the volume of confinement.
 
Hi there,

In the idea of fusion power, the amount of combustible needed will depend mainly on your expected output power. If you want to have a small experimental fusion plant compared to a few 1000MWe, will vary the amount of fuel needed.

Cheers
 
Now, I am a little confused. Is it sent into the tokomak in the form or gas or injected as frozen pellets. Maybe, It starts with neutral gas and later fed with D-T ice pellets?
 
Thanks. Your answers made it clear. I also got some anwsers in this website..

http://www.fusion.org.uk/info/glossary/glossmain.htm
 
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