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Design of RF Feed System for Standing-Wave Accelerator Structures
We are investigating a standing wave accelerator structure that uses a rf feed to each individual cell. This approach minimizes rf power flow and electromagnetic energy absorbed by an rf breakdown. The objective of this work is a robust high-gradient (above 100 MV/m) X-band accelerator structure.
Date:
May 25, 2012
Creator:
Neilson, J.; Tantawi, S. & Dolgashev, V.
System:
The UNT Digital Library
Electronic Reconstruction through the Structural and Magnetic Transitions in Detwinned NaFeAs
We use angle-resolved photoemission spectroscopy to study twinned and detwinned iron pnictide compound NaFeAs. Distinct signatures of electronic reconstruction are observed to occur at the structural (T{sub S}) and magnetic (T{sub SDW}) transitions. At T{sub S}, C{sub 4} rotational symmetry is broken in the form of an anisotropic shift of the orthogonal d{sub xz} and d{sub yz} bands. The magnitude of this orbital anisotropy rapidly develops to near completion upon approaching T{sub SDW}, at which temperature band folding occurs via the antiferromagnetic ordering wave vector. Interestingly, the anisotropic band shift onsetting at T{sub S} develops in such a way to enhance the nesting conditions in the C{sub 2} symmetric state, hence is intimately correlated with the long range collinear AFM order. Furthermore, the similar behaviors of the electronic reconstruction in NaFeAs and Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2} suggests that this rapid development of large orbital anisotropy between T{sub S} and T{sub SDW} is likely a general feature of the electronic nematic phase in the iron pnictides, and the associated orbital fluctuations may play an important role in determining the ground state properties.
Date:
May 25, 2012
Creator:
Yi, M.; Lu, D. H.; Moore, R. G.; Kihou, K.; Lee, C. H.; Iyo, A. et al.
System:
The UNT Digital Library
[Flying Beauty Keeps Shine]
Online article printed from Abilene Reporter-News about a plane from the WASP training years, a 1944 Fairchild PT-19A, that still runs and is taken care of by Bill Johnson.
Date:
May 25, 2012
Creator:
Kendall-Ball, Greg
System:
The Portal to Texas History