An electron beam ion source to be used in atomic physics experiments has been designed, constructed and partially tested. The source utilizes a conventional solenoid and an externally launched electron beam. Ultra-hig...
An electron beam ion source to be used in atomic physics experiments has been designed, constructed and partially tested. The source utilizes a conventional solenoid and an externally launched electron beam. Ultra-high vacuum in the ionization region of the source is provided by a distributed sputter-ion pump. The source is relatively simple in design and easy to operate. Thus far it has been used to produce300 eV/q multiply charged beams of carbon, nitrogen, oxygen, and possibly titanium.
In this experiment, the charge state distribution resulting from atomic rearrangement following the creation of the inner shell vacancies in krypton atoms has been recorded. Intense, highly collimated, monochromatic a...
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In this experiment, the charge state distribution resulting from atomic rearrangement following the creation of the inner shell vacancies in krypton atoms has been recorded. Intense, highly collimated, monochromatic and tunable X-ray radiation available at the CHESS synchrotron radiation facility at Cornell was used to photionize krypton atoms in a gas jet target, and a time-of-flight spectrometer was used to record the ions in different charge states formed after photoionization. Charge state spectra were recorded below, at the 'peak' in the K edge and above the edge. Below the edge, charge states plus 4 to plus 7 were observed with appreciable intensity, while at, and above the edge, the charge states ranged from plus 4 to plus 10.
An electron beam ion source (EBIS) for the production of low energy, multiply charged ion beams to be used in atomic physics experiments has been designed and constructed. An external high perveance electron gun is us...
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An electron beam ion source (EBIS) for the production of low energy, multiply charged ion beams to be used in atomic physics experiments has been designed and constructed. An external high perveance electron gun is used to launch the electron beam into a conventional solenoid. Novel features of the design include a distributed sputter ion pump to create the ultrahigh vacuum environment in the ionization region of the source and microprocessor control of the axial trap voltage supplies.
Theoretical expressions for the angular and spectral distributions of synchrotron radiation involve modified Bessel functions of fractional order and the integral ʃ x ∞ K ν (η) d η . A simple series expressions fo...
Theoretical expressions for the angular and spectral distributions of synchrotron radiation involve modified Bessel functions of fractional order and the integral ʃ x ∞ K ν (η) d η . A simple series expressions for these quantities which can be evaluated numerically with hand-held programmable calculators is presented.
作者：
AZIZ, ABDULTHE AUTHOR was born in East Pakistan on January 31
1932 received the Bachelor of Science degree in Mechanical Engineering from the Dacca University in Pakistan in 1952 and the Master of Science degree in Mechanical Engineering from the Michigan State University in 1953. He did further graduate work at MIT Columbia and Johns Hopkins Universities and is now a candidate for the doctoral degree at the University of Maryland. He joined the Department of Navy in March 1966 with the Naval Ship Research and Development Center Annapolis Division where he worked on the MESA (Machinery Effectiveness Systems Analysis) Program sponsored by the Navy Ship Systems Command. The present paper is largely based on a 138-page report entitled “Systems Effectiveness in the United States Navy” on the works of the MESA Program. Currently he is assigned to the Naval Research Laboratory to provide inhouse engineering support in the development and analysis of systems and their components for the conduct of fundamental research in Astronomy and Astrophysics by the Laboratory. Prior to joining the Department of Navy he worked for General Electric Cdmpany in the analysis and development of large steam turbine components and for Burns & Roe Corporation in systems design and analysis for power plants both fossil powered and nuclear. With Burns & Roe he participated in the systems effectiveness analysis of the Army PM-3A nuclear power plant in the Antarctica. He received the United States citizenship in January 1966 is a member of the ASME and the U.S. Naval Institute.
We review future global demand for electricity and major technologies positioned to supply it with minimal greenhouse gas (GHG) emissions: renewables (wind, solar, water, geothermal, and biomass), nuclear fission, and...
We review future global demand for electricity and major technologies positioned to supply it with minimal greenhouse gas (GHG) emissions: renewables (wind, solar, water, geothermal, and biomass), nuclear fission, and fossil power with CO2 capture and sequestration. We discuss two breakthrough technologies (space solar power and nuclear fusion) as exciting but uncertain additional options for low-net GHG emissions (i.e., low-carbon) electricity generation. In addition, we discuss grid integration technologies (monitoring and forecasting of transmission and distribution systems, demand-side load management, energy storage, and load balancing with low-carbon fuel substitutes). For each topic, recent historical trends and future prospects are reviewed, along with technical challenges, costs, and other issues as appropriate. Although no technology represents an ideal solution, their strengths can be enhanced by deployment in combination, along with grid integration that forms a critical set of enabling technologies to assure a reliable and robust future low-carbon electricity system.
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