dc.contributor.advisor |
Hur, Min Sup |
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dc.contributor.author |
Jo(Cho), Myung-Hoon |
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dc.date.accessioned |
2024-01-24T15:26:50Z |
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dc.date.available |
2024-01-24T15:26:50Z |
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dc.date.issued |
2015-02 |
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dc.description.abstract |
Laser-plasma interaction is an interesting field with numerous practical and scientific applications. In this thesis, I will present three topics in the system of laser and underdense plasma: terahertz (THz) generation by a current driving near cutoff of plasma, plasma diagnostics by Raman scattering, and particle injection in laser wake field acceleration. For the first issue, I will present a new mechanism of generating THz using colliding laser pulses in a magnetized plasma. In this scheme, a THz radiation with a monochromatic feature and high power of 0.1MW was observed. Every aspect of the phenomena was analyzed successfully by a new theory. From this study, I and my collaborators found a new physics of growing electromagnetic field in the range of cut-off frequency. As a 2nd topic, a new diagnosing method of magnetized plasmas is presented. A simple theory of X-mode dispersion relation indicates that frequency shift of Raman backward scattering is much sensitive to the magnetic field than the Raman forward scattering. It is shown that such a difference between RBS and RFS can be used for measuring the magnetic field and plasma density simultaneously. The result is compared with 1D PIC simulation. In the final topic, I will discuss an improved theoretical condition of electron trapping into the ellipsoidal bubble in laser wake field acceleration. The improved theory describes better the electron injection in a more generally shaped bubble than just the previous spherical bubble model, and also exhibits good agreement with the 3D PIC simulations. In addition these topics require different PIC techniques. I will also briefly introduce various numerical techniques used in simulating those topics. |
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dc.description.degree |
Doctor |
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dc.description |
Department of Physics |
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dc.identifier.uri |
https://scholarworks.unist.ac.kr/handle/201301/71908 |
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dc.identifier.uri |
http://unist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001925637 |
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dc.language |
eng |
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dc.publisher |
Ulsan National Institute of Science and Technology (UNIST) |
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dc.rights.embargoReleaseDate |
9999-12-31 |
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dc.rights.embargoReleaseTerms |
9999-12-31 |
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dc.subject |
laser plasma interaction, terahertz, raman scattering, laser wake field acceleration |
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dc.title |
Theoretical Study of Topics in the Interaction of Laser and Under-dense Plasma |
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dc.type |
Thesis |
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