Measurements of hot electron spectra from high irradiance laser plasmas
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- Tez No: 402011
- Danışmanlar: PROF. GREG TALLENTS
- Tez Türü: Doktora
- Konular: Enerji, Fizik ve Fizik Mühendisliği, Energy, Physics and Physics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2014
- Dil: İngilizce
- Üniversite: The University of York
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 172
Özet
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Özet (Çeviri)
This thesis presents measurements of the production of hot electrons during laser interactions in the irradiance range 1016 -1020 Wcm−2. This intensity regime is accessible with modest ultra-short lasers at 1016 Wcm−2 where resonance absorption dominates the electron acceleration. At the higher irradiances (1018− 1020 Wcm−2), petawatt class lasers are required where J × B electron acceleration occurs. Fast electron generation using the VULCAN Petawatt laser (irradiances 1020 Wcm−2) and the LASERIX facility (irradiances 1016 Wcm−2) have been investigated. Using the Vulcan Petawatt laser, with pulse duration of 1 - 2 ps at intensities greater than 1020 Wcm−2, electron energies up to 120 MeV with temperatures 20 - 30 MeV have been observed. A pre pulse was used to create an expanding plasma in which the high irradiance pulse was incident and the scale length of the pre pulse produced plasma was measured using optical probing. It was found that the number of hot electrons produced at 1020Wcm−2 linearly increases with the measured pre pulse plasma scale length indicating that the electron acceleration is dependent on the pre-pulse plasma volume. 2D PIC simulations are in agreement with experimentally measured temperatures, while 1D PIC simulations only agree for shorter scale length plasmas (L . 7.5 μm). Plasma channels are formed with longer scale length plasmas, but these channels do not result in greater acceleration of electrons as they are not sufficiently narrow. The role of hot electrons in heating solid targets is experimentally examined and it is found that radiation effects on target heating when a pre pulse is present dominate over hot electron heating.
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