&lt;title&gt;Theoretical modeling of the transient Ni-like Ag x-ray laser&lt;/title&gt;

Smith, R. F.; Benredjem, D.; Moeller, C. E.; Kuba, J.; Klisnick, A.; Pert, G.J.; Upcraft, L.M.; King, Robert; Gauthier, Jean-Claude J.; Drska, L.

doi:10.1117/12.450580

Cited by 3 publications

(3 citation statements)

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“…This time represents the optimised temporal separation between the 600ps long pulse and the picosecond main heating pulse on the COMET laser facility. Simulations predict that the region which contributes most effectively to the x-ray laser amplification lies at an electron density of ~1×10 20 cm -3 [7,11]. In the density map this region lies at 40µm away from the target surface.…”

Section: Interferometric Characterization Of the X-ray Laser Mediummentioning

confidence: 97%

“…Saturated x-ray lasing output of ~10 µJ is achieved with an optical pumping combination of a 600 ps long pulse (1.5 J, ~1 × 10 11 W cm -2 ) and a temporally compressed (0.5 → 27ps) main heating pulse (4 J, 5 → 0.1 × 10 14 W cm -2 ). The energy within the long pulse in conjunction with to the delay before the arrival of the short CPA pulse dictates the density conditions in which the x-ray laser is generated and propagates [7]. A 1.6 cm x 140µm line focus utilizing a traveling wave geometry is used to irradiate a 1.25 cm long polished Pd slab target.…”

Section: Interferometric Characterization Of the X-ray Laser Mediummentioning

confidence: 99%

“…Simulations of the x-ray laser medium have shown [7] that the electron density profile setup by the long pulse remains relatively unperturbed (± 5%) during the interaction of the main CPA heating pulse and the time period over which gain and x-ray laser propagation takes place. Therefore, by interferometrically probing and measuring the 2D electron density profile at a chosen delay after the peak of the 600ps long pulse, we are observing the density conditions in which the x-ray laser gain is generated and in which the x-ray laser pulse subsequently propagates.…”

Section: Interferometric Characterization Of the X-ray Laser Mediummentioning

confidence: 99%

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Improved energy coupling into the gain region of the Ni-like Pd transient collisional X-ray laser

Smith¹,

Dunn²,

Nilsen³

et al. 2005

X-Ray Lasers 2004

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We present within this paper a series of experiments, which yield new observations to further our understanding of the transient collisional x-ray laser medium. We use the recently developed technique of picosecond x-ray laser interferometry to probe the plasma conditions in which the x-ray laser is generated and propagates. This yields two dimensional electron density maps of the plasma taken at different times relative to the peak of the 600ps plasma-forming beam. In another experimental campaign, the output of the x-ray laser plasma column is imaged with a spherical multilayer mirror onto a CCD camera to give a two-dimensional intensity map of the x-ray laser output. Near-field imaging gives insights into refraction, output intensity and spatial mode structure. Combining these images with the density maps gives an indication of the electron density at which the x-ray laser is being emitted at (yielding insights into the effect of density gradients on beam propagation). Experimental observations coupled with simulations predict that most effective coupling of laser pump energy occurs when the duration of the main heating pulse is comparable to the gain lifetime (~10ps for Ni-like schemes). This can increase the output intensity by more than an order of magnitude relative to the case were the same pumping energy is delivered within a shorter heating pulse duration (< 3ps). We have also conducted an experiment in which the output of the x-ray laser was imaged onto the entrance slit of a high temporal resolution streak camera. This effectively takes a one-dimensional slice of the x-ray laser spatial profile and sweeps it in time. Under some conditions we observe rapid movement of the x-ray laser (~ 3µm/ps) towards the target surface.

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Section: Interferometric Characterization Of the X-ray Laser Mediummentioning

confidence: 97%

Section: Interferometric Characterization Of the X-ray Laser Mediummentioning

confidence: 99%

Section: Interferometric Characterization Of the X-ray Laser Mediummentioning

confidence: 99%

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