At NIF what is the shape of the 1st stage of the plasma

In summary, the shape of the plasma at Nif (National Ignition Facility) can vary depending on factors such as the energy and intensity of the laser beams used, the target design, and the properties of the material being used. It can take on shapes such as spherical, spindle-shaped, and even irregular shapes, depending on the specific parameters of the experiment.
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hagopbul
357
36
Hello all:

I was wondering what is the shape of the plasma at Nif ,is it spherical ?

I start to wonder that it may be spindle shaped ,or fusiform shaped .

Best
H
 
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https://physicsworld.com/a/giant-lasers-pass-new-milestone-towards-fusion-energy/
The $3.5bn NIF trains 192 pulsed laser beams on to the inner surface of a centimetre-long hollow metal cylinder known as a hohlraum. Inside is a fuel capsule, which is a roughly 2 mm-diameter hollow sphere containing a thin deuterium-tritium layer. Each pulse lasts just a few nanoseconds and the lasers can deliver about 1.8 MJ of energy. This powerful blast causes the capsule to implode rapidly, creating immense temperatures and pressures inside a central “hot spot”, where fusion reactions occur.

https://lasers.llnl.gov/workshops/science_of_ignition/pdfs/science_of_fusion_ignition_on_NIF.pdfSee - 3.4.3 Hotspot formation and fuel-shape physics, pp. 35-36
 
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Hi H,

That's a great question! The shape of the plasma at Nif (National Ignition Facility) is actually not a simple answer. It depends on a few factors such as the energy and intensity of the laser beams used, the target design, and the properties of the material being used.

In general, the plasma at Nif can take on a variety of shapes, including spherical, spindle-shaped, and even irregular shapes. This is because the laser beams used to create the plasma can have different focal points and intensities, which can result in different plasma shapes.

Some experiments at Nif have shown a more spherical shape, while others have shown a spindle or fusiform shape. It all depends on the specific parameters of the experiment.

I hope this helps answer your question!

 

Related to At NIF what is the shape of the 1st stage of the plasma

What is the shape of the 1st stage of the plasma at NIF?

The first stage of the plasma at NIF is in the shape of a cylinder. This is because the plasma is confined and compressed by powerful laser beams that are directed at a cylindrical target.

Why is the 1st stage of the plasma at NIF in the shape of a cylinder?

The cylindrical shape allows for more efficient and uniform compression of the plasma. This is important for achieving high temperatures and densities, which are necessary for fusion reactions to occur.

How is the shape of the 1st stage of the plasma controlled at NIF?

The shape of the plasma is controlled by the precise alignment and timing of the laser beams. This requires advanced optics and sophisticated control systems to ensure the desired shape is achieved.

What are the advantages of using a cylindrical shape for the 1st stage of the plasma at NIF?

The cylindrical shape allows for better control and confinement of the plasma, resulting in higher temperatures and densities. It also allows for more efficient use of the laser energy, leading to more successful fusion reactions.

Are there any other shapes that have been considered for the 1st stage of the plasma at NIF?

Yes, other shapes such as spheres and cones have been considered and tested. However, the cylindrical shape has proven to be the most effective for achieving fusion reactions at NIF.

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