Angular distribution of plasma ablation in laser-irradiated cylindrical cavities

Soom, B.; Weber, Rudolf; Balmer, J. E.

doi:10.1016/0030-4018(90)90175-s

Cited by 7 publications

(2 citation statements)

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“…Hollow cylindrical targets (Hohlraum), either with longitudinal [6] or transverse irradiation through an entrance slit in the wall [7,8], have been studied. Also, in order to trap the beam, Hohlraums with an entrance slit off-center have been suggested [9]. One of the motivations for using Hohlraum targets is that the confined plasma improves homogenization and acts as an x-ray waveguide.…”

Section: Introductionmentioning

confidence: 99%

Hohlraum target for overcoming refractive losses in plasma x-ray lasers

Masoudnia

Bleiner

2013

Laser Phys.

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Refractive losses in laser-produced plasmas used as gain media are caused by electron density gradients, and limit the energy transport range. The pump pulse is thus deflected from the high-gain region and the short wavelength laser signal also steers away, causing loss of collimation. A Hohlraum used as a target makes the plasma homogeneous and can mitigate refractive losses by means of wave-guiding. A computational study combining a hydrodynamics code and an atomic physics code is presented, which includes a ray-tracing modeling based on the eikonal theory of the trajectory equation. This study presents gain calculations based on population inversion produced by free-electron collisions exciting bound electrons into metastable levels in the 3d 9 4d 1 (J = 0) → 3d 9 4p 1 (J = 1) transition of Ni-like Sn. Further, the Hohlraum suggests a dramatic enhancement of the conversion efficiency of collisionally excited x-ray lasing for Ni-like Sn.

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Section: Introductionmentioning

confidence: 99%

Hohlraum target for overcoming refractive losses in plasma x-ray lasers

Masoudnia

Bleiner

2013

Laser Phys.

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“…1 In particular, the filling and closure of laser heated cylindrical cavities has been studied using soft x-ray streak camera and slit aperture imaging. 2,3 These schemes 3 have often employed relatively broadband response streak cameras, typically 0.1-6 keV. Here we describe the use of a soft x-ray streak camera with a relatively narrow channel response, centered around 120 eV photon energy, to image the expanding wall plasma from a cylindrical gold cavity target heated using the 1 TW two beam HELEN laser facility at AWE.…”

Section: Introductionmentioning

confidence: 99%

One-dimensional time resolved soft x-ray imaging of colliding plasmas in a laser heated cavity

Eagleton

Foster

Rosen

et al. 1997

Review of Scientific Instruments

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We describe x-ray streak camera measurements of wall motion and plasma filling in hohlraum targets heated by the AWE HELEN laser. An x-ray streak camera using a transmission mode photocathode on a thin plastic substrate (1000 Å Parylene-N) was coupled to a 15° incidence gold mirror to define a spectral channel response of width 45 eV full width at half-maximum centered around 120 eV. A 20 μm diam pinhole was used to image the hohlraum interior onto the photocathode slit of the streak camera, via the gold reflector. Plasma expansion from the laser hot spots, and the indirectly heated wall, was recorded. The experimental data are compared with simulations using the AWE Lagrangian hydrocode NYM.

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