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Numerical modeling of recombination ...

Avitzour, Yoav.

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Numerical modeling of recombination x-ray lasers in transition to ground state.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Numerical modeling of recombination x-ray lasers in transition to ground state./
作者:	Avitzour, Yoav.
面頁冊數:	147 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-08, Section: B, page: 4294.
Contained By:	Dissertation Abstracts International66-08B.
標題:	Physics, Fluid and Plasma. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3188610
ISBN:	9780542306822

Numerical modeling of recombination x-ray lasers in transition to ground state.
Avitzour, Yoav.

Numerical modeling of recombination x-ray lasers in transition to ground state. - 147 p.

Source: Dissertation Abstracts International, Volume: 66-08, Section: B, page: 4294.

Thesis (Ph.D.)--Princeton University, 2006.

Recombination scheme lasers have the potential to reach very short wavelengths, especially when utilizing the transition to ground state. Throughout the 1990s, a few groups (including the Princeton group) demonstrated gain in the LiIII 2 → 1 transition (at 13.5nm). However, the physics behind the different processes involved in creating the gain was not fully understood, and the experimental effort was unable to achieve gain saturation. In contrast to the experimental results, several theoretical studies that attempted to provide better understanding of the physics behind recombination gain reached the conclusion that it is practically impossible to achieve gain with the pumping scheme that was suggested and used in the above-mentioned experiments.

ISBN: 9780542306822Subjects--Topical Terms:

1018402
Physics, Fluid and Plasma.

Numerical modeling of recombination x-ray lasers in transition to ground state.
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245 1 0 $a Numerical modeling of recombination x-ray lasers in transition to ground state.
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500 $a Source: Dissertation Abstracts International, Volume: 66-08, Section: B, page: 4294.
500 $a Adviser: Szymon Suckewer.
502 $a Thesis (Ph.D.)--Princeton University, 2006.
520 $a Recombination scheme lasers have the potential to reach very short wavelengths, especially when utilizing the transition to ground state. Throughout the 1990s, a few groups (including the Princeton group) demonstrated gain in the LiIII 2 → 1 transition (at 13.5nm). However, the physics behind the different processes involved in creating the gain was not fully understood, and the experimental effort was unable to achieve gain saturation. In contrast to the experimental results, several theoretical studies that attempted to provide better understanding of the physics behind recombination gain reached the conclusion that it is practically impossible to achieve gain with the pumping scheme that was suggested and used in the above-mentioned experiments.
520 $a In order to assist the experimental efforts and to resolve the discrepancy between the experimental and theoretical results, I developed a comprehensive numerical model, using the high-power computing facility at the Princeton Plasma Physics Laboratory (PPPL) to study and simulate the processes involved in the experiments and to understand the physics behind them. I found that by taking a more comprehensive approach and taking into account additional significant properties of the plasma used in the experiments, which were not considered by the theoretical studies mentioned above, I was able to show that high gain is indeed feasible in LiIII 2 → 1 transition. I also characterized the gain behavior under different parameters in order to optimize forthcoming experiments. I then investigated the possibility of mixing hydrogen into the plasma to enhance the gain and found an optimum mixing ratio for different plasma and pump parameters. Finally, I showed that gain can be achieved with higher Z elements, up to (but not limited to) CVI 2 → 1 transition at 3.4 nm. This may enable the development of a table-top x-ray laser with wavelength within the so-called "water-window" (the wavelength range 2.3--4.4 nm, for which absorption in water is low).
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