Plasmabeta

The plasma beta ( ) is the ratio of thermal to magnetic pressure in a plasma . ${\displaystyle \beta }$

It is thus defined as

${\displaystyle \beta ={\frac {p}{p_{\mathrm {mag} }}}={\frac {n\,k_{\mathrm {B} }T}{B^{2}/(2\mu _{0})}}}$.

• ${\displaystyle n}$ Particle density
• ${\displaystyle k_{\mathrm {B} }}$ Boltzmann's constant
• ${\displaystyle T}$ absolute temperature
• ${\displaystyle B}$ magnetic flux density
• ${\displaystyle \mu _{0}}$ magnetic field constant

The value is used to describe the behavior of cosmic plasma with a magnetic field, such as B. the solar wind or to describe the plasma in a nuclear fusion reactor . In order for a plasma to be confined by a magnetic field , must apply. ${\displaystyle \beta <1}$

Individual evidence

1. ^ J. Wesson: Tokamaks. 3. Edition. Oxford University Press, 2004, ISBN 0-19-850922-7 , p. 115.
2. ↑ ruhr-uni-bochum.de: Why the solar wind is diamond-shaped. Press release 367, November 15, 2011.
3. ↑ Experimental achievement of toroidal beta beyond that predicted by `` Troyon '' scaling. from: osti.gov , September 1, 1994, accessed October 17, 2014.
4. ↑ Kenrō Miyamoto: Plasma Physics and Controlled Nuclear Fusion. Springer, 2005, ISBN 3-540-24217-1 , p. 62.