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CROSSING OF AN INCOHERENT INTEGRAL RESONANCE IN THE ELECTRON RING ACCELERATOR
In one mode of operation of an electron ring accelerator (ERA), at the end of compression rings are slowly moved through the radial integral betatron resonance Q{sub r} = 1. Although the coherent radial oscillation frequency of the ring as a whole remains below unit, the oscillation frequencies of individual electron are (incoherently) caused to pass through the resonance because of the additional focusing from ions trapped in the ring. In this paper the effect of field errors on ring major and minor radii is evaluated--theoretically--for the cases in which the spread in the square of the electron oscillation frequency ({Delta}{sup 2}) is (a) much larger and (b) much smaller than the contribution to the square of the oscillation frequency from the ions ({Lambda}{sup 2}). It is shown that for the ERA, where case (b) applies, the increase in ring minor dimensions, for given field errors and rate of resonance crossing, is less than in case (a) by a factor of ({Delta}/{Lambda}){sup 2}. Numerical examples show that the degradation of ring quality in case (b) should, with suitable attention to the design and construction of the ERA apparatus, be acceptably small.
Date:
January 26, 1970
Creator:
Pellegrini, Claudio & Sessler, Andrew M.
Object Type:
Report
System:
The UNT Digital Library
The Western Outlook. (San Francisco, Oakland and Los Angeles, Calif.), Vol. 21, No. 14, Ed. 1 Saturday, December 26, 1914
Weekly African-American newspaper published in Oakland, California that includes local, state and national news along with extensive advertising.
Date:
December 26, 1914
Creator:
Francis, Joseph S. & Derrick, J. Lincoln
Object Type:
Newspaper
System:
The Portal to Texas History
Increasing waterflood reserves in the Wilmington oil field through improved reservoir characterization and reservoir management. Quarterly technical progress report, March 21, 1995--June 30, 1995
The main objective of this project is the transfer of technologies, methodologies, and findings developed and applied in this project to other operators of Slope and Basin Clastic Reservoirs. This project will study methods to identify sands with high remaining oil saturation and to recomplete existing wells using advanced completion technology. The identification of the sands with high remaining oil saturation will be accomplished by developing a deterministic 3-D geologic model and by using a state of the art reservoir management computer software. The wells identified by the geologic and reservoir engineering work as having the best potential will be logged with a pulsed acoustic cased-hole logging tool. The application of the logging tools will be optimized in the lab by developing a rock-log model. The wells that are shown to have the best oil production potential will be recompleted. The recompletions will be optimized by evaluating short radius and ultra-short radius lateral recompletions. Technical progress is reported for the following tasks: Reservoir characterization; reservoir engineering; 3-D geologic modeling; pulsed acoustic logging; and technology transfer.
Date:
July 26, 1995
Creator:
Sullivan, D.; Clarke, D.; Walker, S.; Phillips, C.; Nguyen, J.; Moos, D. et al.
Object Type:
Report
System:
The UNT Digital Library
Greensheet (Houston, Tex.), Vol. 37, No. 611, Ed. 1 Friday, January 26, 2007
Free weekly newspaper that includes business and classified advertising.
Date:
January 26, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 563, Ed. 1 Friday, December 26, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
December 26, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 41, No. 515, Ed. 1 Friday, November 26, 2010
Free weekly newspaper that includes business and classified advertising.
Date:
November 26, 2010
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 41, No. 47, Ed. 1 Friday, February 26, 2010
Free weekly newspaper that includes business and classified advertising.
Date:
February 26, 2010
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 44, No. 155, Ed. 1 Friday, April 26, 2013
Free weekly newspaper that includes business and classified advertising.
Date:
April 26, 2013
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 36, No. 347, Ed. 1 Friday, August 26, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
August 26, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Matrix Formalism for Spin Dynamics Near a Single Depolarization Resonance
A matrix formalism is developed to describe the spin dynamics in a synchrotron near a single depolarization resonance as the particle energy (and therefore its spin precession frequency) is varied in a prescribed pattern as a function of time such as during acceleration. This formalism is first applied to the case of crossing the resonance with a constant crossing speed and a finite total step size, and then applied also to other more involved cases when the single resonance is crossed repeatedly in a prescribed manner consisting of linear ramping segments or sudden jumps. How repeated crossings produce an interference behavior is discussed using the results obtained. For a polarized beam with finite energy spread, a spin echo experiment is suggested to explore this interference effect.
Date:
October 26, 2005
Creator:
Chao, Alexander W.
Object Type:
Article
System:
The UNT Digital Library
Topological Insulators and Nematic Phases from Spontaneous Symmetry Breaking in
We investigate the stability of a quadratic band-crossing point (QBCP) in 2D fermionic systems. At the non-interacting level, we show that a QBCP exists and is topologically stable for a Berry flux {-+}2{pi}, if the point symmetry group has either fourfold or sixfold rotational symmetries. This putative topologically stable free-fermion QBCP is marginally unstable to arbitrarily weak shortrange repulsive interactions. We consider both spinless and spin-1/2 fermions. Four possible ordered states result: a quantum anomalous Hall phase, a quantum spin Hall phase, a nematic phase, and a nematic-spin-nematic phase.
Date:
May 26, 2010
Creator:
Sun, K.
Object Type:
Article
System:
The UNT Digital Library
A Hypothesis of the Magnetostatic Turbulence and its Implications for Astrophysics
Arguments are presented in favor of a possible existence of a random, force-free magnetic field. Ponderomotive forces in such a field are small, and the evolutionary time is much longer than Alfven crossing time over the vortex scale, whence the suggested term ''magnetostatic''. The presence of this long-lived random magnetic field provides stiffness with respect to large-scale compressional motions. On the other hand, such a field cannot be detected by techniques involving line-of-sight averaging. It may therefore be a source of stiffness for various astrophysical objects, ranging from plasmas in clusters of galaxies to the interiors of molecular clouds in HII regions, and remaining at the same time undetectable. Analysis of large-scale motions on the background of the magnetostatic turbulence is presented; it is concluded that these large-scale motions can be roughly described by a usual hydrodynamics for the matter with an isotropic pressure; the adiabatic index is 4/3.
Date:
February 26, 2007
Creator:
Ryutov, D. D. & Remington, B. A.
Object Type:
Article
System:
The UNT Digital Library
e+ e- Factory Developments
The impressive performance of current (KEKB) and recent (PEP-II) B-Factory colliders has increased interest in developing even higher luminosity B-factories. Two new designs are being developed (SuperKEKB and SuperB). Both designs plan to deliver a luminosity in the range of 1 x 10{sup 36} cm{sup -2}s{sup -1}, nearly 100 times the present B-factory level. Achieving this high luminosity requires high-current beams and short bunch lengths and/or a new way of colliding the beams. The SuperB design employs a crabbed magnetic waist with a large crossing angle and the SuperKEKB design is looking at crab cavities with high-current beams and/or a travelling focus. I describe the designs being studied to achieve the high luminosity needed for the next generation of B-Factories.
Date:
August 26, 2010
Creator:
Sullivan, Michael
Object Type:
Article
System:
The UNT Digital Library
Theory of coherent transition radiation generated at a plasma-vacuum interface
Transition radiation generated by an electron beam, produced by a laser wakefield accelerator operating in the self-modulated regime, crossing the plasma-vacuum boundary is considered. The angular distributions and spectra are calculated for both the incoherent and coherent radiation. The effects of the longitudinal and transverse momentum distributions on the differential energy spectra are examined. Diffraction radiation from the finite transverse extent of the plasma is considered and shown to strongly modify the spectra and energy radiated for long wavelength radiation. This method of transition radiation generation has the capability of producing high peak power THz radiation, of order 100 (mu)J/pulse at the plasma-vacuum interface, which is several orders of magnitude beyond current state-of-the-art THz sources.
Date:
June 26, 2003
Creator:
Schroeder, Carl B.; Esarey, Eric; van Tilborg, Jeroen & Leemans, Wim P.
Object Type:
Article
System:
The UNT Digital Library
A Single-Shot Method for Measuring Femtosecond Bunch Length in Linac-Based Free-Electron Lasers
There is growing interest in the generation and characterization of femtosecond and subfemtosecond pulses from linac-based free-electron lasers (FELs). In this report, following the method of Ricci and Smith [Phys. Rev. ST Accel. Beams 3, 032801 (2000)], we investigate the measurement of the longitudinal bunch profile of an ultrashort electron bunch produced by these FELs. We show that this method can be applied in a straightforward manner at x-ray FEL facilities such as the Linac Coherent Light Source by slightly adjusting the second bunch compressor followed by running the bunch on an rf zero-crossing phase of the final linac. We find that the linac wakefield strongly perturbs the measurement, and through analysis show that it can be compensated in a simple way. We demonstrate the effectiveness of this method and wakefield compensation through numerical simulations, including effects of coherent synchrotron radiation and longitudinal space charge. When used in conjunction with a high-resolution electron spectrometer, this method potentially reveals the temporal profile of the electron beam down to the femtosecond and subfemotsecond scale.
Date:
August 26, 2010
Creator:
Huang, Z.; Bane, K.; Ding, Y. & Emma, P.
Object Type:
Article
System:
The UNT Digital Library
Anisotropic intermediate valence in Yb2M3Ga9 (M = Rh, Ir)
The intermediate valence compounds Yb{sub 2}M{sub 3}Ga{sub 9} (M = Rh, Ir) exhibit an anisotropic magnetic susceptibility. We report measurements of the temperature dependence of the 4f occupation number, n{sub f}(T), for Yb{sub 2}M{sub 3}Ga{sub 9} as well as the magnetic inelastic neutron scattering spectrum S{sub mag}({Delta}E) at 12 and 300 K for Yb{sub 2}Rh{sub 3}Ga{sub 9}. Both n{sub f}(T) and S{sub mag}({Delta}E) were calculated for the Anderson impurity model with crystal field terms within an approach based on the non-crossing approximation. These results corroborate the importance of crystal field effects in these materials; they also suggest that Anderson lattice effects are important to the physics of Yb{sub 2}M{sub 3}Ga{sub 9}.
Date:
April 26, 2005
Creator:
Christianson, A. D.; Lawrence, J. M.; Lobos, A. M.; Aligia, A. A.; Bauer, E. D.; Moreno, N. O. et al.
Object Type:
Article
System:
The UNT Digital Library
The Garland News. (Garland, Tex.), Vol. 17, No. 11, Ed. 1 Friday, June 26, 1903
Weekly newspaper from Garland, Texas that includes local, state, and national news along with advertising.
Date:
June 26, 1903
Creator:
Cullom, John H.
Object Type:
Newspaper
System:
The Portal to Texas History
The Garland News (Garland, Tex.), Vol. 54, No. 26, Ed. 1 Friday, September 26, 1941
Weekly newspaper from Garland, Texas that includes local, state, and national news along with advertising.
Date:
September 26, 1941
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Garland News (Garland, Tex.), Vol. 55, No. 48, Ed. 1 Friday, February 26, 1943
Weekly newspaper from Garland, Texas that includes local, state, and national news along with advertising.
Date:
February 26, 1943
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Garland News. (Garland, Tex.), Vol. 19, No. 42, Ed. 1 Friday, January 26, 1906
Weekly newspaper from Garland, Texas that includes local, state, and national news along with advertising.
Date:
January 26, 1906
Creator:
Holford, Will A.
Object Type:
Newspaper
System:
The Portal to Texas History
The Garland News. (Garland, Tex.), Vol. 17, No. 45, Ed. 1 Friday, February 26, 1904
Weekly newspaper from Garland, Texas that includes local, state, and national news along with advertising.
Date:
February 26, 1904
Creator:
Green, Joe T.
Object Type:
Newspaper
System:
The Portal to Texas History
The Garland News (Garland, Tex.), Vol. 55, No. 13, Ed. 1 Friday, June 26, 1942
Weekly newspaper from Garland, Texas that includes local, state, and national news along with advertising.
Date:
June 26, 1942
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Interaction of intense microwave radiation and fully ionized hydrogen plasma. Part 1. High-density system
None
Date:
July 26, 1974
Creator:
Ensley, D.L.
Object Type:
Report
System:
The UNT Digital Library
Convairiety, Volume 10, Number 26, December 26, 1957
Bimonthly newsletter published for employees of the Convair Division in Fort Worth containing work-related information, updates about employees, and other news.
Date:
December 26, 1957
Creator:
General Dynamics Corporation. Convair Division.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History