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Abstract:
Previous forays by AFIT into positron research have resulted in the development of a new positron annihilation spectroscopy (PAS) technique and the procurement of a low-energy positron beam system. The primary purpose of this research was to design and build a state-of-the-art PAS laboratory at AFIT capable to address a myriad of DoD solid-state and surface physics questions. The main objectives were to acquire and assemble utilities to operate a positron beam, assemble and con gure an ultra-high vacuum (UHV) system for samples, design and build an interface with a magnetic eld to propagate positrons onto samples, and create a new version of the three-dimensional positron annihilation spectroscopy system (3DPASS). The 3DPASS, which measures coincidence Doppler broadening of annihilation radiation (CDBAR) and two-dimensional angular correlation of annihilation radiation (2D-ACAR), was characterized using a Cu-22Na positron annihilation source made as part of this project. Integration of the 3DPASS with low-energy positron beam will allow for energy-dependent, nondestructive characterization of materials using PAS.
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Master's thesis |
| Pages: |
132 |
| Report Date: |
22 Mar 2012 |
| Report Number: |
A044855 |
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