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Plasma beta — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Plasma_beta
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-06T12:51:04.278Z
SHA-256 of the archived text: 1183fb02a919b1acfa6422c4bc3eabe190819898027dbc1085bf91a0b43470a7
Stable URL of this page: https://metraipolis.com/documento/dc_90be014f673c

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Plasma beta — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Plasma_beta (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_90be014f673c (Metraipolis archive dc_90be014f673c, sha256 1183fb02a919b1acfa6422c4bc3eabe190819898027dbc1085bf91a0b43470a7)

BibTeX

@misc{dc90be014f673c,
  title = {Plasma beta — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Plasma_beta},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_90be014f673c; sha256 1183fb02a919b1acfa6422c4bc3eabe190819898027dbc1085bf91a0b43470a7},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Plasma_beta. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

The beta of a plasma, symbolized by β, is the ratio of the plasma pressure (p = nkBT) to the magnetic pressure (pmag = B2/2μ0). The term is commonly used in studies of the Sun and Earth's magnetic field, and in the field of fusion power designs. In the fusion power field, plasma is often confined using strong magnets. Since the temperature of the fuel scales with pressure, reactors attempt to reach the highest pressures possible. The costs of large magnets roughly scales like β1/2. Therefore, beta can be thought of as a ratio of money out to money in for a reactor, and beta can be thought of (very approximately) as an economic indicator of reactor efficiency. For tokamaks, betas of larger than 0.05 or 5% are desired for economically viable electrical production. The same term is also used when discussing the interactions of the solar wind with various magnetic fields. For example, beta in the corona of the Sun is about 0.01.

Tema degli esploratori: fisica e astronomia (deposito sistematico; ricerca «plasma physics»).
Fonte: Wikipedia in inglese, voce «Plasma beta» — https://en.wikipedia.org/wiki/Plasma_beta
Wikidata Q2098466: «il rapporto tra la pressione di un plasma e la pressione magnetica» (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q2098466
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Plasma_beta?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1375979491, consultata il 2026-10-06T11:07:17.860Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: bce7fbe434283e1692df0aaab415c1ef8d97b183c80750c507bff4bdde7228c9