Stable Power Compression with Efficient Relativistic UV Channel Formation in Cluster Targets

  • Alex B. Borisov
  • Charles K. RhodesEmail author
Part of the Springer Series in Optical Sciences book series (SSOS, volume 189)


Comparative single-pulse studies of self-trapped plasma channel formation in Xe and Kr cluster targets produced with 1–2 TW femtosecond 248 nm pulses reveal energy-efficient (>90 %) power compression with formation of relativistic ultraviolet (248 nm) self-trapped plasma channels. A key observation is the highly robust stability of the channeled propagation characteristic of both materials. Images of the channel morphology produced by Thomson scattering from the electron density correlated with the direct visualization of the Xe(M) and Kr(L) X-ray emission from radiating ions illustrate (1) the channel formation, (2) the narrow region of confined trapped propagation, (3) the abrupt termination of the channel that occurs at the point the power falls below the critical power Pcr, and, in the case of Xe channels, (4) the presence of saturated absorption of Xe(M) radiation that generates an extended peripheral zone of ionization. These observations provide new quantitative information on the channeling mechanism and its ability to produce very high power densities under stable conditions. The measured rates for energy deposition per unit length are ∼1.46 J/cm and ∼0.82 J/cm for Xe and Kr targets, respectively, and the single-pulse Xe(M) energy yield is estimated to be >50 mJ, a value indicating an efficiency >20 % for ∼1 keV X-ray production from the incident 248 nm pulse. An efficiency of this magnitude heralds the future production of kiloelectronvolt X-ray pulses with energies of ∼1 J.


Critical Power Channel Formation Plasma Channel Peak Electron Density Cluster Target 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This research was funded by DARPA on contract no. DAAD 10-01-C-0068 through the Army Research Laboratory. We acknowledge the participation of John C. McCorkindale, Sankar Poopalasingam, and James W. Longworth in the performance of the experimental work. Charles K. Rhodes respectfully acknowledges many insightful conversations with C. Martin Stickley about these studies over a period of several years.


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© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Laboratory for X-ray Microimaging and Bioinformatics, Department of PhysicsUniversity of Illinois at ChicagoChicagoUSA

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