Todd R. Allen
University of Wisconsin-Madison
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Publication
Featured researches published by Todd R. Allen.
APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY: Twenty-Second International Conference | 2013
Kevin G. Field; C. J. Wetteland; G. Cao; B. R. Maier; Clayton Dickerson; T. J. Gerczak; C. R. Field; K. Kriewaldt; K. Sridharan; Todd R. Allen
The University of Wisconsin Ion Beam Laboratory (UW-IBL) has recently undergone significant infrastructure upgrades to facilitate graduate level research in irradiated materials phenomena and ion beam analysis. A National Electrostatics Corp. (NEC) Torodial Volume Ion Source (TORVIS), the keystone upgrade for the facility, can produce currents of hydrogen ions and helium ions up to ∼200 μA and ∼5 μA, respectively. Recent upgrades also include RBS analysis packages, end station developments for irradiation of relevant material systems, and the development of an in-house touch screen based graphical user interface for ion beam monitoring. Key research facilitated by these upgrades includes irradiation of nuclear fuels, studies of interfacial phenomena under irradiation, and clustering dynamics of irradiated oxide dispersion strengthened steels. The UW-IBL has also partnered with the Advanced Test Reactor National Scientific User Facility (ATR-NSUF) to provide access to the irradiation facilities housed at t...
APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY: Twenty-Second International Conference | 2013
C. J. Wetteland; Kevin G. Field; T. J. Eiden; T. J. Gerczak; B. R. Maier; O. Albakri; K. Sridharan; Todd R. Allen
The National Electrostatics Corporations (NEC) Toroidal Volume Ion Source (TORVIS) source is known for exceptionally high proton currents with minimal service downtime as compared to traditional sputter sources. It has been possible to obtain over 150μA of proton current from the source, with over 70μA on the target stage. However, beam fluxes above ∼1×1017/m2-s may have many undesirable effects, especially for insulators. This may include high temperature gradients at the surface, sputtering, surface discharge, cracking or even disintegration of the sample. A series of experiments were conducted to examine the role of high current fluxes in a suite of ceramics and insulating materials. Results will show the optimal proton irradiation conditions and target mounting strategies needed to minimize unwanted macro-scale damage, while developing a procedure for conducting preliminary radiation experiments.
Journal of Nuclear Materials | 2013
Kevin G. Field; L. Barnard; Chad M. Parish; Jeremy T Busby; Dane Morgan; Todd R. Allen
Journal of Nuclear Materials | 2008
Yong Yang; Clayton Dickerson; Hannah Swoboda; Brandon Miller; Todd R. Allen
Journal of Nuclear Materials | 2009
Jian Gan; Yong Yang; Clayton Dickson; Todd R. Allen
Journal of Nuclear Materials | 2009
Yong Yang; Clayton Dickerson; Todd R. Allen
Journal of Nuclear Materials | 2014
Janne Pakarinen; Marat Khafizov; Lingfeng He; Chris Wetteland; Jian Gan; Andrew T. Nelson; David H. Hurley; Anter El-Azab; Todd R. Allen
Journal of Nuclear Materials | 2014
Young Yang; Wei-Yang Lo; Clayton Dickerson; Todd R. Allen
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 2014
Janne Pakarinen; Lingfeng He; Mahima Gupta; Jian Gan; Andrew T. Nelson; Anter El-Azab; Todd R. Allen
Nuclear Engineering and Design | 2014
Y. Huang; B. R. Maier; Todd R. Allen