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Dreicer field — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Dreicer_field
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-31T09:56:11.602Z
SHA-256 of the archived text: ef5e5b2d95627f5b36d443a2ac9369250b1e61c434b538454f112875861a0397
Stable URL of this page: https://metraipolis.com/documento/dc_59cd26d14196

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Dreicer field — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Dreicer_field (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_59cd26d14196 (Metraipolis archive dc_59cd26d14196, sha256 ef5e5b2d95627f5b36d443a2ac9369250b1e61c434b538454f112875861a0397)

BibTeX

@misc{dc59cd26d14196,
  title = {Dreicer field — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Dreicer_field},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_59cd26d14196; sha256 ef5e5b2d95627f5b36d443a2ac9369250b1e61c434b538454f112875861a0397},
  year = {2026}
}

Archived text

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

The Dreicer field (or Dreicer electric field) is the critical electric field above which electrons in a collisional plasma can be accelerated to become runaway electrons. It was named after Harry Dreicer who derived the expression in 1959 and expanded on the concept (i.e. runaway generation) in 1960. The Dreicer field is an important parameter in the study of tokamaks to suppress runaway generation in nuclear fusion. The Dreicer field is given by E D = 1 4 π ϵ 0 2 n e 3 ln Λ m e v T e 2 {\displaystyle E_{D}={\frac {1}{4\pi \epsilon _{0}^{2}}}{\frac {ne^{3}\ln \Lambda }{m_{e}v_{Te}^{2}}}} where n {\displaystyle n} is the electron density, e {\displaystyle e} is the elementary charge, ln Λ {\displaystyle \ln \Lambda } is the Coulomb logarithm, ϵ 0 {\displaystyle \epsilon _{0}} is the vacuum permittivity, m e {\displaystyle m_{e}} is the electron mass and v T e {\displaystyle v_{Te}} is the electron thermal speed. It was derived by considering the balance between the electric field and the collisional forces acting on a single electron within the plasma. Recent experiments have shown that the electric field required to accelerate electrons is significantly larger than the theoretically calculated Dreicer field. New models have been proposed to explain the discrepancy.

Tema degli esploratori: fisica e astronomia (deposito sistematico; ricerca «plasma physics»).
Fonte: Wikipedia in inglese, voce «Dreicer field» — https://en.wikipedia.org/wiki/Dreicer_field
Wikidata Q65048895 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q65048895
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Dreicer_field?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 1315325502, consultata il 2026-10-31T09:41:54.027Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 25382d44147bf341ef179fa747e059694564e7ab2eae9e163e6b918f35ddbcf1