报告摘要：
Research and development of adapting new ion source technologies in neutron generators with increased capabilities for homeland security applications is being conducted at the Lawrence Berkeley National Laboratory (LBNL). Penning ion sources have long been used because of their ease of operation, low power consumption and compactness. Recent work at LBNL indicates that the source performance, i.e., extracted beam current density and atomic ion fraction, can be improved for increased neutron yields by better magnetic confinement, optimization of electrode geometry, and choice of wall materials. A range of high-yield DD generators has been developed in past years based on radio-frequency (RF) driven ion sources that produce high extracted beam currents and high atomic fractions. More recently, permanent-magnet, microwave-driven ion sources have been developed for high-output generators. These sources are more power efficient than RF-driven ones while providing similar mono-atomic fractions and beam current densities. They operate also at lower gas pressure, which makes them more suitable for sealed tubes DT operation. In pursuit of ultra-compact, low-power generators that are easily portable and can serve as replacement for radiological sources, a field emission ionization source is under development that does not consume RF or DC discharge power. Using nanotechnology and micromachining nanoemitter arrays are fabricated on a cathode. By applying a high voltage between the cathode and the neutron production target D/T ions are generated at the tips due to field enhancement and accelerated onto the target.
报告人简历：
EDUCATION:
l 2003 Ph.D. in Electrical Engineering, University of California, Berkeley, California.
Thesis: “Maskless, resistless focused ion beam lithography processes”
Thesis advisor: Professor Tsu-Jae King and Ka-Ngo Leung
l 1998 M.A. in Physics, University of California, Berkeley, California.
l 1996 M.S. in Nuclear physics, University of Science and Technology of China, Hefei,P. R. China.
Thesis: “Electron energy-loss spectroscopy studies of noble gases and mercury vapor”. Thesis advisor: Professor Kezun Xu
l 1993 B.S. in Nuclear physics, University of Science and Technology of China, Hefei,P. R. China.
WORK EXPERIENCE:
l 2/2005 – present Lawrence Berkeley National Laboratory. Berkeley, California.
Research Scientist, Ion Beam Technology Group
Research in the areas of neutron generator, ion source technology, maskless ion
beam lithography, ion beam nanofabrication.
l 1/2003 – 1/2005 Harvard University, Cambridge, Massachusetts.
Postdoctoral fellow, Center for Imaging and Mesoscale Structures
Development of an integrated FIB/SEM system for direct doping and surface
modification.
l 1/1998 – 12/2002 Lawrence Berkeley National Laboratory, Berkeley, California.
Graduate Student Research Assistant, Plasma and Ion Source Technology Group
Development of focused ion beam techniques for maskless and resistless
lithography processes.
l 6/1997 – 12/1997 University of California, Berkeley, California.
Graduate Student Research Assistant
Involved in a project of developing an ultra high vacuum, high magnetic field
scanning tunneling microscope.
l 2/1994 – 5/1996 University of Science and Technology of China.
Graduate Student Researcher
Research in the areas of electron energy-loss spectroscopy of noble gases and
mercury vapor. |
