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Full-Text Articles in Engineering
Ionizing Radiation Detection Using Microstructured Optical Fiber, Stanton Dehaven
Ionizing Radiation Detection Using Microstructured Optical Fiber, Stanton Dehaven
Electrical & Computer Engineering Theses & Dissertations
Ionizing radiation detecting microstructured optical fibers are fabricated, modeled and experimentally measured for X-ray detection in the 10-40 keV energy range. These fibers operate by containing a scintillator material which emits visible light when exposed to ionizing radiation. An X-ray source characterized with a CdTe spectrometer is used to quantify the X-ray detection efficiency of the fibers. The solid state CdTe detector is considered 100% efficient in this energy range. A liquid filled microstructured optical fiber (MOF) is presented where numerical analysis and experimental observation leads to a geometric theory of photon transmission using total internal reflection. The model relates …
Fourier Transform Analysis Of Terahertz Radiation, Chikaodira N. Okpo
Fourier Transform Analysis Of Terahertz Radiation, Chikaodira N. Okpo
Electrical & Computer Engineering Theses & Dissertations
Advances in terahertz radiation (T-rays) technology have great promise in various technological areas ranging from medical technology, imaging technology and accelerator technology. At Thomas Jefferson Laboratory, the Free Electron Laser division (FEL) produces very powerful beam of laser light by accelerating electrons in bunches along a beamline. This laser light absorbs and releases energy at various wavelengths. The new FEL upgrade led to the production of very bright terahertz (THz) radiation with an average power of 1 00watts which is about 100,000 times brighter than those produced elsewhere. These T-rays have very significant applications in the Laboratory. The most significant …
High Power 121.6 Nm Radiation Source For Advanced Lithography, Jianxun Yan
High Power 121.6 Nm Radiation Source For Advanced Lithography, Jianxun Yan
Electrical & Computer Engineering Theses & Dissertations
A novel high power 121.6 nm radiation source based on dielectric barrier discharge (DBD) has been developed for advanced lithography applications. The discharge unit consists basically of a hollow tube made of a dielectric material with two loop-electrodes wrapped on the outside of the tube. The discharge is generated inside the tube by means of a 13.56 MHz RF power system. The discharge unit is located in a vacuum chamber that provides a dynamic gas flow and windows for radiation transmission.
A very intense and spectrally clean Lyman-α line at 121.6 nm was observed by operating the DBD discharge in …