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526 Matching Results
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The Altus Times (Altus, Okla.), Vol. 111, No. 293, Ed. 1 Sunday, August 23, 2009
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 23, 2009
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Baytown Sun (Baytown, Tex.), Vol. 89, No. 235, Ed. 1 Sunday, August 23, 2009
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
August 23, 2009
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
Evolution of electron beam phase space distribution in a high-gain FEL
FEL-based coherent electron cooling (CEC) offers a new avenue to achieve high luminosities in high energy colliders such as RHIC, LHC, and eRHIC. Traditional treatments consider the FEL as an amplifier of optical waves with specific initial conditions, focusing on the resulting field. CEC requires knowledge of the phase space distribution of the electron beam in the FEL. We present 1D analytical results for the phase space distribution of an electron beam with an arbitrary initial current profile, and discuss approaches of expanding to 3D results.
Date:
August 23, 2009
Creator:
Webb,S.D. & Litvinenko, V. N.
Object Type:
Article
System:
The UNT Digital Library
Experiment on suppression of spontaneous undulator radiation at ATF
We propose undertaking a demonstration experiment on suppressing spontaneous undulator radiation from an electron beam at BNL's Accelerator Test Facility (ATF). We describe the method, the proposed layout, and a possible schedule. There are several advantages in strongly suppressing shot noise in the electron beam, and the corresponding spontaneous radiation. The self-amplified spontaneous (SASE) emission originating from shot noise in the electron beam is the main source of noise in high-gain FEL amplifiers. It may negatively affect several HG FEL applications ranging from single- to multi-stage HGHG FELs. SASE saturation also imposes a fundamental hard limit on the gain of an FEL amplifier in a coherent electron-cooling scheme. A novel active method for suppressing shot noise in relativistic electron beams by many orders-of-magnitude was recently proposed. While theoretically such strong suppression appears feasible, the performance and applicability of this novel method must be evaluated experimentally. Several practical questions about the proposed noise suppressor, such as 3D effects and/or sensitivity to the e-beam parameters also require experimental clarification. To do this, we propose here a proof-of-principle experiment using elements of the VISA FEL at BNL's Accelerator Test Facility.
Date:
August 23, 2009
Creator:
Litvinenko,V. & Yakimenko, V.
Object Type:
Article
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Sunday, August 23, 2009
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 23, 2009
Creator:
Pittman, Jerry & Wray, Kelly
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Panola Watchman (Carthage, Tex.), Vol. 137, No. 67, Ed. 1 Sunday, August 23, 2009
Semiweekly newspaper from Carthage, Texas that includes local, state, and national news along with advertising.
Date:
August 23, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 127, No. 68, Ed. 1 Sunday, August 23, 2009
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
August 23, 2009
Creator:
Reddell, Valerie
Object Type:
Newspaper
System:
The Portal to Texas History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 94, No. 272, Ed. 1 Sunday, August 23, 2009
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 23, 2009
Creator:
Shance, Brenda
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Stochastic Temporal Properties of the SASE FEL
We review the statistical description of the chaotic time evolution of the radiation from a self-amplified spontaneous-emission free-electron laser in the linear region before saturation. A high-gain, self-amplified spontaneous-emission (SASE) free-electron laser (FEL) [1, 2], based on modern beam technology, has the advantage of operating without a resonator and hence is capable of generating coherent radiation with wavelength down to the x-ray region. The LCLS at SLAC has recently achieved high gain and saturation at 1.5 {angstrom} [3]. A review of SASE theory can be found in ref. [4]. In this paper, we have considered the linear regime before saturation. In the nonlinear saturation regime, SASE is no longer a Gaussian process and analytic treatment is very difficult. A valuable numerical simulation analysis of the statistical behavior in the nonlinear regime can be found in ref. [10,11].
Date:
August 23, 2009
Creator:
Krinsky, S.
Object Type:
Article
System:
The UNT Digital Library
Suppression of shot noise and spontaneous radiation in electron beams
Shot noise in the electron beam distribution is the main source of noise in high-gain FEL amplifiers, which may affect applications ranging from single- and multi-stage HGHG FELs to an FEL amplifier for coherent electron cooling. This noise also imposes a fundamental limit of about 10{sup 6} on FEL gain, after which SASE FELs saturate. There are several advantages in strongly suppressing this shot noise in the electron beam, and the corresponding spontaneous radiation. For more than a half-century, a traditional passive method has been used successfully in practical low-energy microwave electronic devices to suppress shot noise. Recently, it was proposed for this purpose in FELs. However, being passive, the method has some significant limitations and is hardly suitable for the highly inhomogeneous beams of modern high-gain FELs. I present a novel active method of suppressing, by many orders-of-magnitude, the shot noise in relativistic electron beams. I give a theoretical description of the process, and detail its fundamental limitation.
Date:
August 23, 2009
Creator:
Litvinenko,V.
Object Type:
Article
System:
The UNT Digital Library
Sweetwater Reporter (Sweetwater, Tex.), Vol. 111, No. 237, Ed. 1 Sunday, August 23, 2009
Daily newspaper from Sweetwater, Texas that includes local, state, and national news along with advertising.
Date:
August 23, 2009
Creator:
Rodriguez, Tatiana
Object Type:
Newspaper
System:
The Portal to Texas History
The Bastrop Advertiser (Bastrop, Tex.), Vol. 155, No. 52, Ed. 1 Saturday, August 23, 2008
Semi-weekly newspaper from Bastrop, Texas that includes local, state and national news along with advertising.
Date:
August 23, 2008
Creator:
Hagerty, Terry
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 88, No. 237, Ed. 1 Saturday, August 23, 2008
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
August 23, 2008
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
[Funeral Program for Ruby Lee Stovall, August 23, 2008]
Funeral program for Sister Ruby Lee Stovall, born November 21, 1918 and died August 14, 2008. The funeral was held August 23, 2008 at Calvary Baptist Church, officiated by Rev. Kevin Nelson. Funeral arrangements were made through Lewis Funeral Home and she was buried in Southern Memorial Park in San Antonio, Texas.
Date:
August 23, 2008
Creator:
unknown
Object Type:
Pamphlet
System:
The Portal to Texas History
Perry Daily Journal (Perry, Okla.), Vol. 116, No. 165, Ed. 1 Saturday, August 23, 2008
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 23, 2008
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Seminole Sentinel (Seminole, Tex.), Vol. 99, No. 92, Ed. 1 Saturday, August 23, 2008
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
August 23, 2008
Creator:
Wright, Dustin
Object Type:
Newspaper
System:
The Portal to Texas History
Solubility of Anthracene in Quaternary Solvent Mixtures of 2,2,4-Trimethylpentane + 2-Propanone + Methanol + Alcohols at 298.15 K
Article on the solubility of anthracene in quaternary solvent mixtures of 2,2,4-trimethylpentane + 2-propanone + methanol + alcohols at 298.15 K.
Date:
August 23, 2008
Creator:
Shayanfar, Ali; Soltanpour, Shahla; Jabbaribar, Farnaz; Hamidi, Ali A.; Acree, William E. (William Eugene) & Jouyban, Abolghasem
Object Type:
Article
System:
The UNT Digital Library
Active Creation of Instrinsically Localized Vibrations in Uranium Using X-Ray and Neutron Scattering
In real materials, nonlinear forces cause the frequencies of vibrating atoms to depend on amplitude. As a consequence, a large-amplitude fluctuation on the scale of the atom spacing can develop a frequency that does not resonate with the normal modes, causing energy to become trapped in an intrinsically localized mode (ILM)--also called 'discrete breather' or 'lattice soliton'. As temperature is increased, entropy is expected to stabilize increased concentrations of these random hotspots. This mechanism, which spontaneously concentrates energy, has been observed in analogous systems on a larger scale, but direct sightings at the atomic scale have proved difficult. Two challenges have hampered progress: (1) the need to separate ILMs from modes associated with crystal imperfections, and (2) complications that arise at high temperatures, including feature broadening and multiphonon processes. Here we solve both of these problems by actively creating ILMs at low temperatures in {alpha}-uranium using high-energy inelastic x-ray and neutron scattering. The ILM creation excitation occurs at energies ten times higher than conventional lattice excitations, cleanly separating it from modes associated with crystal imperfections. The discovery of this excitation not only proves the existence of ILMs in uranium but also opens up a new route for finding ILMs in …
Date:
August 23, 2007
Creator:
Manley, M.; Alatas, A.; Trouw, F.; Hults, W.; Leu, B.; Lynn, J. et al.
Object Type:
Article
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 132, No. 14, Ed. 1 Thursday, August 23, 2007
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
August 23, 2007
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
The Altus Times (Altus, Okla.), Vol. 109, No. 72, Ed. 1 Thursday, August 23, 2007
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 23, 2007
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Archer County Advocate (Holliday, Tex.), Vol. 5, No. 20, Ed. 1 Thursday, August 23, 2007
Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date:
August 23, 2007
Creator:
Stevens, Charlotte
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County News (Archer City, Tex.), No. 34, Ed. 1 Thursday, August 23, 2007
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
August 23, 2007
Creator:
Lewis, Shelley
Object Type:
Newspaper
System:
The Portal to Texas History
[Balloon artist and students at Fall Collision]
Photograph of students and a balloon artist, who is wearing a Buzz Lightyear costume, inside of the University Union for Fall Collision. The artist is holding a pink and white balloon dog and there is a large amount of balloons tied together beside him. The students are holding papers and pointing at the balloons they want.
Date:
August 23, 2007
Creator:
Evans, Rebecca
Object Type:
Photograph
System:
The UNT Digital Library
[Balloon artist dressed as Buzz Lightyear]
Photograph of someone who is wearing a Buzz Lightyear costume and making a balloon dog inside of the University Union for Fall Collision. There is a large amount of balloon tubes for making more animals and shapes tied together beside him.
Date:
August 23, 2007
Creator:
Evans, Rebecca
Object Type:
Photograph
System:
The UNT Digital Library