X-ray spectroscopy of 1 cm plasma channels produced by self-guided pulse propagation in elongated cluster jets
Journal Article
·
· Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
- Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742 (United States)
We diagnose the self-channeled propagation of intense femtosecond pulses over an extended distance in a N{sub 2}O cluster gas target using high resolution kilovolt x-ray pinhole images of the channel and spatially resolved x-ray spectra. The x-ray images are consistent with femtosecond optical scattering, shadowgraphy, and interferometry images. We observe extended plasma channels ({approx}9 mm) limited either by the cluster jet length or by absorption, for injected laser intensities in the range of 10{sup 16}-10{sup 17} W/cm{sup 2}. Spectral line shapes for the OVII 1s{sup 2}-1s3p and OVIII 1s-2p transitions (at 1.8627 and 1.8969 nm, respectively) show significant broadening to the blue side and with truncated emission on the red side. We attribute this effect to Doppler blueshifted emission from fast ions from exploding clusters moving toward the spectrometer; redshifted emission from the opposite side of the cluster is absorbed.
- OSTI ID:
- 21069796
- Journal Information:
- Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, Journal Name: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics Journal Issue: 6 Vol. 73; ISSN PLEEE8; ISSN 1063-651X
- Country of Publication:
- United States
- Language:
- English
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