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http://hdl.handle.net/1903/3913
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| Title: | Interaction of Intense Short Laser Pulses with Gases of Nanoscale Atomic and Molecular Clusters |
| Authors: | Gupta, Ayush |
| Advisors: | Antonsen, Thomas M. |
| Department/Program: | Electrical Engineering |
| Type: | Dissertation |
| Sponsors: | Digital Repository at the University of Maryland
University of Maryland (College Park, Md.) |
| Keywords: | Physics, Fluid and Plasma (0759)
Physics, Optics (0752)
Laser-Cluster Interaction; Atomic Clusters; Pulse Propagation; Resonant Heating; Particle-in-Cell Code; Plasma Physics |
| Issue Date: | 9-Aug-2006 |
| Abstract: | We study the interaction of intense laser pulses with gases of van der Waals bound atomic aggregates called clusters in the range of laser-cluster parameters such that kinetic as well as hydrodynamic effects are active. The clustered gas absorbs the laser pulse energy efficiently producing x-rays, extreme ultraviolet radiation, energetic particles and fusion neutrons.
First, we investigate the effect of pulse duration on the heating of a single cluster in a strong laser field using a 2-D electrostatic particle-in-cell (PIC) code. Heating is dominated by a collision-less resonant absorption process that involves energetic electrons transiting through the cluster. A size-dependent intensity threshold defines the onset of this resonance [Taguchi et al., Phys. Rev. Lett., v90(20), (2004)]. It is seen that increasing the laser pulse width lowers this intensity threshold and the energetic electrons take multiple laser periods to transit the cluster instead of one laser period as previou... |
| URI: | http://hdl.handle.net/1903/3913 |
| Appears in Collections: | Electrical & Computer Engineering Theses and Dissertations
UM Theses and Dissertations
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| umi-umd-3764.pdf | | 2742Kb | Adobe PDF | 234 | View/Open |
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