### Abstract

Using interferometry, we investigate the dynamics of interaction of a relativistically intense 4-TW, 400-fs laser pulse with a He gas jet. We observe a stable plasma channel 1 mm long and less than 30 [Formula Presented]m in diameter, with a radial gradient of electron density [Formula Presented] [Formula Presented] and with an on-axis electron density approximately ten times less than its maximum value of [Formula Presented] [Formula Presented] A high radial velocity of the surrounding gas ionization of [Formula Presented] cm/s has been observed after the channel formation, and it is attributed to the fast ions expelled from the laser channel and propagating radially outward. We developed a kinetic model which describes the plasma channel formation and the subsequent ambient gas excitation and ionization. Comparing the model predictions with the interferometric data, we reconstructed the axial profile of laser channel and on-axis laser intensity. The estimated maximum energy of accelerated ions is about 500 keV, and the total energy of the fast ions is 5% of the laser pulse energy.

Original language | English (US) |
---|---|

Pages (from-to) | 7042-7054 |

Number of pages | 13 |

Journal | Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics |

Volume | 59 |

Issue number | 6 |

DOIs | |

State | Published - Jan 1 1999 |

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### ASJC Scopus subject areas

- Statistical and Nonlinear Physics
- Mathematical Physics
- Condensed Matter Physics
- Physics and Astronomy(all)

### Cite this

*Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics*,

*59*(6), 7042-7054. https://doi.org/10.1103/PhysRevE.59.7042

**Self-focusing, channel formation, and high-energy ion generation in interaction of an intense short laser pulse with a he jet.** / Sarkisov, G. S.; Bychenkov, V. Yu; Novikov, V. N.; Tikhonchuk, V. T.; Maksimchuk, A.; Chen, S. Y.; Wagner, R.; Mourou, G.; Umstadter, D.

Research output: Contribution to journal › Article

*Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics*, vol. 59, no. 6, pp. 7042-7054. https://doi.org/10.1103/PhysRevE.59.7042

}

TY - JOUR

T1 - Self-focusing, channel formation, and high-energy ion generation in interaction of an intense short laser pulse with a he jet

AU - Sarkisov, G. S.

AU - Bychenkov, V. Yu

AU - Novikov, V. N.

AU - Tikhonchuk, V. T.

AU - Maksimchuk, A.

AU - Chen, S. Y.

AU - Wagner, R.

AU - Mourou, G.

AU - Umstadter, D.

PY - 1999/1/1

Y1 - 1999/1/1

N2 - Using interferometry, we investigate the dynamics of interaction of a relativistically intense 4-TW, 400-fs laser pulse with a He gas jet. We observe a stable plasma channel 1 mm long and less than 30 [Formula Presented]m in diameter, with a radial gradient of electron density [Formula Presented] [Formula Presented] and with an on-axis electron density approximately ten times less than its maximum value of [Formula Presented] [Formula Presented] A high radial velocity of the surrounding gas ionization of [Formula Presented] cm/s has been observed after the channel formation, and it is attributed to the fast ions expelled from the laser channel and propagating radially outward. We developed a kinetic model which describes the plasma channel formation and the subsequent ambient gas excitation and ionization. Comparing the model predictions with the interferometric data, we reconstructed the axial profile of laser channel and on-axis laser intensity. The estimated maximum energy of accelerated ions is about 500 keV, and the total energy of the fast ions is 5% of the laser pulse energy.

AB - Using interferometry, we investigate the dynamics of interaction of a relativistically intense 4-TW, 400-fs laser pulse with a He gas jet. We observe a stable plasma channel 1 mm long and less than 30 [Formula Presented]m in diameter, with a radial gradient of electron density [Formula Presented] [Formula Presented] and with an on-axis electron density approximately ten times less than its maximum value of [Formula Presented] [Formula Presented] A high radial velocity of the surrounding gas ionization of [Formula Presented] cm/s has been observed after the channel formation, and it is attributed to the fast ions expelled from the laser channel and propagating radially outward. We developed a kinetic model which describes the plasma channel formation and the subsequent ambient gas excitation and ionization. Comparing the model predictions with the interferometric data, we reconstructed the axial profile of laser channel and on-axis laser intensity. The estimated maximum energy of accelerated ions is about 500 keV, and the total energy of the fast ions is 5% of the laser pulse energy.

UR - http://www.scopus.com/inward/record.url?scp=0001706273&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0001706273&partnerID=8YFLogxK

U2 - 10.1103/PhysRevE.59.7042

DO - 10.1103/PhysRevE.59.7042

M3 - Article

C2 - 11969693

AN - SCOPUS:0001706273

VL - 59

SP - 7042

EP - 7054

JO - Physical review. E

JF - Physical review. E

SN - 1539-3755

IS - 6

ER -