Properties of Resonantly Heated Electron Distributions

Estabrook, K. G.; Kruer, W. L.

doi:10.1103/physrevlett.40.42

Cited by 295 publications

(124 citation statements)

References 17 publications

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“…In the case of a p-polarized laser beam, it is well known that in experimental conditions similar to ours, the hot electrons could be generated by two mechanisms -resonance absorption (RA) and vacuum heating (VH). RA has been well studied both experimentally [17,18,19,20] and theoretically [21,22,23,24] and based on the observations and simulations, the following scaling law [21] has been established:…”

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confidence: 99%

Role of surface roughness in hard-x-ray emission from femtosecond-laser-produced copper plasmas

et al. 2002

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The hard x-ray emission in the energy range of 30 − 300 keV from copper plasmas produced by 100 fs, 806 nm laser pulses at intensities in the range of 10 15 -10 16 W cm −2 is investigated. We demonstrate that surface roughness of the targets overrides the role of polarization state in the coupling of light to the plasma. We further show that surface roughness has a significant role in enhancing the x-ray emission in the above mentioned energy range.

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Role of surface roughness in hard-x-ray emission from femtosecond-laser-produced copper plasmas

et al. 2002

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“…Thus we argue that the electrostatic plasma waves generated by the RA mechanism (typically with E 2 /4πn e T e ≫ 1 ) during the laser pulse will continue to slowly damp (or convect away) and accelerate electrons for a few hundred femtoseconds after the laser pulse. To get an estimate of S 0 , which is the magnitude of the source term | (c/σ)( ∇ × j hot ) | , we evaluate j hot ≈ f a eI/T hot by taking a conversion fraction (f a ) of incident energy into hot electrons as 0.3 and T hot ∼ 20 keV (estimated by using the well known scaling laws for resonance absorption [21]). This yields hot electron current density j hot ∼ 4.5 × 10 20 statampere/cm 2 .…”

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confidence: 99%

Laser-Generated Ultrashort Multimegagauss Magnetic Pulses in Plasmas

et al. 2002

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We demonstrate ultrashort (6 ps), multi-Megagauss (27 MG) magnetic pulses generated upon interaction of an intense laser pulse (10 16 Wcm −2 , 100 fs) with a solid target. The temporal evolution of these giant fields generated near the high density critical layer is obtained with the highest resolution reported so far. Particle-in-cell simulations and phenomenological modeling is used to explain the results. The first direct observations of anomalously rapid damping of plasma shielding currents produced in response to the hot electron currents penetrating the bulk plasma are presented.

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“…4,23,24,34 The tantalum target ͑atomic number Z͒ is subjected to the assumed electron energy distribution, f (E e ) ͓1/keV͔, and generates a bremsstrahlung distribution, g(E B ), which is modelled according to the expression 35,36 g͑E B ͒Ϸ2ϫ10…”

Section: Theorymentioning

confidence: 99%

“…The mirror reflects the light back at 60°t o the incoming beam, giving an angle of incidence of 30°at the target; close to the optimum. 23,[25][26][27] The converging light passes through a 110-m-thick glass plate ͑optical microscopy cover plate͒ and focuses onto the solid target. The parabolic mirror is aligned in air by gradually lowering the laser pulse energy while adjusting the mirror mount and maintaining a visible spark in the focus.…”

Section: The X-ray Generation Setupmentioning

confidence: 99%

“…The main pulse therefore interacts with a plasma with a sharp density profile, and various plasma heating mechanisms, including resonance and vacuum heating, become important. [21][22][23][24] Some electrons penetrate into the surrounding cold metal and bremsstrahlung and characteristic radiation are emitted. We measured a large part of the radiation spectrum in absolute terms through the use of two Ge detectors.…”

Section: Introductionmentioning

confidence: 99%

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High-repetition-rate, hard x-ray radiation from a laser-produced plasma: Photon yield and application considerations

Sjögren

Harbst

Wahlström

et al. 2003

Review of Scientific Instruments

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High-repetition-rate, hard x-ray radiation from a laser-produced plasma: Photon yield and application considerations Sjögren, Anders; Harbst, Michael; Wahlström, Claes-Göran; Svanberg, Sune; Olsson, C Link to publication Citation for published version (APA): Sjögren, A., Harbst, M., Wahlström, C-G., Svanberg, S., & Olsson, C. (2003). High-repetition-rate, hard x-ray radiation from a laser-produced plasma: Photon yield and application considerations. Review of Scientific Instruments, 74(4), 2300-2311. DOI: 10.1063/1.1544054General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal High-repetition-rate, hard x-ray radiation from a laser-produced plasma: Photon yield and application considerations We present an experimental study of hard x rays produced in laser-produced plasmas. The laser used is a 1 kHz system, delivering 0.7 mJ for 25 fs onto a solid target. The x-ray spectrum was measured with calibrated germanium detectors, allowing a very good estimate of the absolute number of photons emitted from the plasma over a wide energy range; from 7 keV to 0.5 MeV. Assuming a bi-Maxwellian electron distribution with temperatures of 4.5 and 63 keV, theoretical calculations support the experimental findings. The imaging characteristics of the x-ray source were investigated experimentally employing image plates and theoretically based on the electron distribution.

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Properties of Resonantly Heated Electron Distributions

Cited by 295 publications

References 17 publications

Role of surface roughness in hard-x-ray emission from femtosecond-laser-produced copper plasmas

Role of surface roughness in hard-x-ray emission from femtosecond-laser-produced copper plasmas

Laser-Generated Ultrashort Multimegagauss Magnetic Pulses in Plasmas

High-repetition-rate, hard x-ray radiation from a laser-produced plasma: Photon yield and application considerations

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