Bremsstrahlung Rates in Fully Ionized Gases in a Magnetic Field

Imazu, Shingo; Irisawa, Juichi; Takano, Shinya

doi:10.1143/jpsj.52.1224

Cited by 2 publications

(6 citation statements)

References 2 publications

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“…This work establishes a theoretical basis for lowering the Lawson criterion of triple product (n i E T i ) for p- 11 B magnetic fusion plasma burn to about one order of magnitude above the ITER goal, by assuming x p = 0.9, T i /T e = 4, and V d = 2C s . This result indicates that a net energy gain via p-11 B magnetic plasma fusion is in theory possible.…”

Section: Resultsmentioning

confidence: 92%

“…30 An implication of creating a large V d in a proton and modest-Z ion plasma of ~10 2 keV in temperature would be a rst laboratory experiment on the aneutronic CNO fusion chain 1-2 reaction rates. By replacing 11 B with some of the stable isotopes in this reaction chain ( 12 C, 13 C, 14 N, or 15 N), a fusion device could be so arranged as to measure the corresponding fusion reaction rates, albeit at minute yet detectable levels.…”

Section: Discussionmentioning

confidence: 99%

“…Neutron-and tritium-free fusion reactions, such as the CNO chain, [1][2] have powered the stars. The aneutronic p- 11 B fusion reaction has lured the imagination of fusion energy researchers of magnetic con nement systems since the 70's. [3][4][5] Research and development toward this clean fusion energy from a magnetically con ned plasma, however, due to its very high required plasma temperatures (greater thañ 10 2 keV in the case of p- 11 B), is an area of research imbued with great challenges.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years however, the theoretical possibility of net energy gain from a magnetized p- 11 B fusion plasma has remained elusive, 6 and has been considered by many to be theoretically impossible. The basis for this view has been known to include the following:…”

Section: Introductionmentioning

confidence: 99%

“…The magnetic eld can substantially change the bremsstrahlung radiation when the Larmor radius r B of an electron is smaller than the characteristic impact parameter r s of close Coulomb collisions. 10 According to analysis in [11], magnetic elds would reduce the bremsstrahlung radiation power. When r B is larger than r s , the effect of magnetic eld on bremsstrahlung radiation becomes negligible.…”

Section: Introductionmentioning

confidence: 99%

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Toroidal plasma conditions where the p-11B fusion Lawson criterion could be eased

Peng¹,

Shi²,

Wang³

et al. 2020

Preprint

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We examine the theoretical conditions in which the Lawson ignition criterion for p-11B fusion in a magnetized toroidal plasma can be reduced substantially. It is determined that a velocity differential between the protons and the boron ions of the order of the plasma sound speed (Mach number of 1 or 2 at a plasma temperature of ~102 keV) could raise the p-11B fusion reaction rate to ~2x10-22 m3/s or ~6x10-22 m^3/s, respectively, from the ~1x10-22 m3/s level in a static plasma. The Lawson triple product (ni τE Ti) required for ignition can thereby be reduced to as low as ~1023 m-3 s keV, which is one order of magnitude above the ITER requirement for D-T burn. Since order-unity Mach numbers in velocity differentials between deuterons and impurity carbon ions have been maintained in tokamak plasmas under excellent confinement conditions, similar levels of velocity differentials between protons and minority boron-11 ions could in principle be maintained also. A theoretical possibility of achieving p-11B fusion ignition in a toroidal plasma of ~102 keV in ion temperature is hereby presented. Similar p-13C plasmas, for example, will introduce a possibility of measuring the CNO fusion chain reaction rates in a laboratory.

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Section: Resultsmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Toroidal plasma conditions where the p-11B fusion Lawson criterion could be eased

Peng¹,

Shi²,

Wang³

et al. 2020

Preprint

View full text Add to dashboard Cite

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Plasma screening effects on electron–ion Coulomb bremsstrahlung in uniformly magnetized plasmas

Jung

2000

Physics of Plasmas

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Plasma screening effects are investigated on classical bremsstrahlung in electron–ion Coulomb scattering in uniformly magnetized plasmas. The calculation is for the limited case of projectile motion along the magnetic field. The electron–ion interaction potential in uniformly magnetized plasmas has been obtained by the introduction of the longitudinal plasma dielectric function. The classical straight-line trajectory method is applied to the path of the projectile electron in order to investigate the variation of the bremsstrahlung cross section as a function of the impact parameter and plasma parameters. The results shows that the bremsstrahlung cross section is increased with increasing the strength of the magnetic field. The bremsstrahlung cross section for the soft photon radiation is found to be greater than that for the hard photon radiation.

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Bremsstrahlung Rates in Fully Ionized Gases in a Magnetic Field

Cited by 2 publications

References 2 publications

Toroidal plasma conditions where the p-11B fusion Lawson criterion could be eased

Toroidal plasma conditions where the p-11B fusion Lawson criterion could be eased

Plasma screening effects on electron–ion Coulomb bremsstrahlung in uniformly magnetized plasmas

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