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Characterization Of Single-Sided Cadmium Zinc Telluride Strip Detectors For High Energy Astrophysics Applications, Burcin Donmez
Characterization Of Single-Sided Cadmium Zinc Telluride Strip Detectors For High Energy Astrophysics Applications, Burcin Donmez
Doctoral Dissertations
Cadmium zinc telluride (CdZnTe or CZT) was introduced as a new room temperature semiconductor detector due to its good energy resolution, high atomic number, high density and good stopping power in the early 1990s. UNH has focused on developing CZT strip detector designs for astrophysical measurement applications in the 0.05 to 1 MeV photon energy range. This thesis presents characterization efforts of two types of single-sided CZT strip detector: non-charge sharing orthogonal coplanar strip detectors and charge-sharing strip detectors. The characterization includes spectroscopy, imaging, uniformity and efficiency measurements. Measured energy resolutions with both detector designs are better than those obtainable …
Ion Thermalization And Wave Excitation Downstream Of Earth's Bow Shock: Theory And Observation, Yong Liu
Ion Thermalization And Wave Excitation Downstream Of Earth's Bow Shock: Theory And Observation, Yong Liu
Doctoral Dissertations
It has been well documented that the plasma immediately downstream of Earth's quasi-perpendicular bow shock, which consists of reflected protons and directly transmitted ions with large temperature anisotropies, is unstable to the excitation of ion-cyclotron waves. These waves in turn scatter the protons and ions to marginal stability. A quasilinear theory is presented for the relaxation of the proton and helium distribution functions and the associated excitation of ion cyclotron waves, downstream of the low-Mach-number quasi-perpendicular Earth's bow shock. For a plasma with low density of He 2+ ions, the theory predicts the wave polarization, power and peak frequency, and …