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A 10-Hz Terawatt Class Ti:Sapphire Laser System: Development and Applications
We developed a two stage Ti:Sapphire laser system to generate 16 mJ/80fs laser pulses at the pulse repetition rate of 10 Hz. The key deriver for the present design is implementing a highly efficient symmetric confocal pre-amplifier and employing a simple, inexpensive synchronization scheme relying only on a commercial digital delay-generator. We characterized the amplified pulses in spatial-, spectral-, and temporal-domains. The laser system was used to investigate various nonlinear optical processes, and to modify the optical properties of metal- and semiconductor-surfaces. We are currently building a third amplifier to boost the laser power to the multi-terawatt range.
Date:
January 12, 2010
Creator:
Sharma, A. K.; Smedley, J.; Tsang, T. & Rao, T.
Object Type:
Article
System:
The UNT Digital Library
500 MW X-BAND RF SYSTEM OF A 0.25 GEV ELECTRON LINAC FOR ADVANCED COMPTON SCATTERING SOURCE APPLICATION
A Mono-Energetic Gamma-Ray (MEGa-Ray) Compton scattering light source is being developed at LLNL in collaboration with SLAC National Accelerator Laboratory. The electron beam for the Compton scattering interaction will be generated by a X-band RF gun and a X-band LINAC at the frequency of 11.424 GHz. High power RF in excess of 500 MW is needed to accelerate the electrons to energy of 250 MeV or greater for the interaction. Two high power klystron amplifiers, each capable of generating 50 MW, 1.5 msec pulses, will be the main high power RF sources for the system. These klystrons will be powered by state of the art solid-state high voltage modulators. A RF pulse compressor, similar to the SLED II pulse compressor, will compress the klystron output pulse with a power gain factor of five. For compactness consideration, we are looking at a folded waveguide setup. This will give us 500 MW at output of the compressor. The compressed pulse will then be distributed to the RF gun and to six traveling wave accelerator sections. Phase and amplitude control are located at the RF gun input and additional control points along the LINAC to allow for parameter control during operation. This high …
Date:
May 12, 2010
Creator:
Chu, T S; Anderson, S G; Gibson, D J; Hartemann, F V; Marsh, R A; Siders, C et al.
Object Type:
Article
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 39, No. 18, Ed. 1 Friday, February 12, 2010
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 12, 2010
Creator:
Price, Racheal
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 39, No. 21, Ed. 1 Friday, March 12, 2010
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
March 12, 2010
Creator:
Price, Racheal
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
2009 Release of the Evaluated Nuclear Data Library (ENDL2009)
None
Date:
August 12, 2010
Creator:
Beck, B.; Brown, D. A.; Descalle, M. A.; Hagmann, C.; Hoffman, R.; Ormand, E. et al.
Object Type:
Report
System:
The UNT Digital Library
[74th annual NADSA conference tape 1 of 2]
Video recording from The Black Academy of Arts and Letters recorded during the 74th National Association of Dramatic and Speech Arts conference on March 12th, 2010. The footage shows a play being performed that centers around characters working and under care in a mental hospital.
Date:
March 12, 2010
Creator:
unknown
Object Type:
Video
System:
The UNT Digital Library
[74th annual NADSA conference tape 2 of 2]
Video recording from The Black Academy of Arts and Letters recorded during the 74th National Association of Dramatic and Speech Arts conference on March 12th, 2010. The footage shows a group of African American men all dressed in black formal clothes performing together.
Date:
March 12, 2010
Creator:
unknown
Object Type:
Video
System:
The UNT Digital Library
Actinic imaging of native and programmed defects on a full-field mask
We describe the imaging and characterization of native defects on a full field extreme ultraviolet (EUV) mask, using several reticle and wafer inspection modes. Mask defect images recorded with the SEMA TECH Berkeley Actinic Inspection Tool (AIT), an EUV-wavelength (13.4 nm) actinic microscope, are compared with mask and printed-wafer images collected with scanning electron microscopy (SEM) and deep ultraviolet (DUV) inspection tools. We observed that defects that appear to be opaque in the SEM can be highly transparent to EUV light, and inversely, defects that are mostly transparent to the SEM can be highly opaque to EUV. The nature and composition of these defects, whether they appear on the top surface, within the multilayer coating, or on the substrate as buried bumps or pits, influences both their significance when printed, and their detectability with the available techniques. Actinic inspection quantitatively predicts the characteristics of printed defect images in ways that may not be possible with non-EUV techniques. As a quantitative example, we investigate the main structural characteristics of a buried pit defect based on EUV through-focus imaging.
Date:
March 12, 2010
Creator:
Mochi, I.; Goldberg, K. A.; Fontaine, B. La; Tchikoulaeva, A. & Holfeld, C.
Object Type:
Article
System:
The UNT Digital Library
ADVANCED X-BAND TEST ACCELERATOR FOR HIGH BRIGHTNESS ELECTRON AND GAMMA RAY BEAMS
In support of Compton scattering gamma-ray source efforts at LLNL, a multi-bunch test stand is being developed to investigate accelerator optimization for future upgrades. This test stand will enable work to explore the science and technology paths required to boost the current 10 Hz monoenergetic gamma-ray (MEGa-Ray) technology to an effective repetition rate exceeding 1 kHz, potentially increasing the average gamma-ray brightness by two orders of magnitude. Multiple bunches must be of exceedingly high quality to produce narrow-bandwidth gamma-rays. Modeling efforts will be presented, along with plans for a multi-bunch test stand at LLNL. The test stand will consist of a 5.5 cell X-band rf photoinjector, single accelerator section, and beam diagnostics. The photoinjector will be a high gradient standing wave structure, featuring a dual feed racetrack coupler. The accelerator will increase the electron energy so that the emittance can be measured using quadrupole scanning techniques. Multi-bunch diagnostics will be developed so that the beam quality can be measured and compared with theory. Design will be presented with modeling simulations, and layout plans.
Date:
May 12, 2010
Creator:
Marsh, R A; Anderson, S G; Barty, C P; Chu, T S; Ebbers, C A; Gibson, D J et al.
Object Type:
Article
System:
The UNT Digital Library
Aerosol indirect effects ? general circulation model intercomparison and evaluation with satellite data
Aerosol indirect effects continue to constitute one of the most important uncertainties for anthropogenic climate perturbations. Within the international AEROCOM initiative, the representation of aerosol-cloud-radiation interactions in ten different general circulation models (GCMs) is evaluated using three satellite datasets. The focus is on stratiform liquid water clouds since most GCMs do not include ice nucleation effects, and none of the model explicitly parameterises aerosol effects on convective clouds. We compute statistical relationships between aerosol optical depth ({tau}{sub a}) and various cloud and radiation quantities in a manner that is consistent between the models and the satellite data. It is found that the model-simulated influence of aerosols on cloud droplet number concentration (N{sub d}) compares relatively well to the satellite data at least over the ocean. The relationship between {tau}{sub a} and liquid water path is simulated much too strongly by the models. This suggests that the implementation of the second aerosol indirect effect mainly in terms of an autoconversion parameterisation has to be revisited in the GCMs. A positive relationship between total cloud fraction (f{sub cld}) and {tau}{sub a} as found in the satellite data is simulated by the majority of the models, albeit less strongly than that in the …
Date:
March 12, 2010
Creator:
Quaas, Johannes; Ming, Yi; Menon, Surabi; Takemura, Toshihiko; Wang, Minghuai; Penner, Joyce E. et al.
Object Type:
Article
System:
The UNT Digital Library
Afghanistan Casualties: Military Forces and Civilians
This report collects statistics from a variety of sources on casualties sustained during Operation Enduring Freedom (OEF), which began on October 7, 2001. OEF actions took place primarily in Afghanistan; however, OEF casualties also includes American casualties in Pakistan, Uzbekistan, Guantanamo Bay (Cuba), Djibouti, Eritrea, Ethiopia, Jordan, Kenya, Kyrgyzstan, the Philippines, Seychelles, Sudan, Tajikistan, Turkey, and Yemen.
Date:
April 12, 2010
Creator:
Chesser, Susan G.
Object Type:
Report
System:
The UNT Digital Library
Afghanistan Casualties: Military Forces and Civilians
This report collects statistics from a variety of sources on casualties sustained during Operation Enduring Freedom (OEF), which began on October 7, 2001. OEF actions took place primarily in Afghanistan; however, OEF casualties also includes American casualties in Pakistan, Uzbekistan, Guantanamo Bay (Cuba), Djibouti, Eritrea, Ethiopia, Jordan, Kenya, Kyrgyzstan, the Philippines, Seychelles, Sudan, Tajikistan, Turkey, and Yemen.
Date:
July 12, 2010
Creator:
Chesser, Susan G.
Object Type:
Report
System:
The UNT Digital Library
Afghanistan: Politics, Elections, and Government Performance
This report discusses the current political state of Afghanistan, as well as the Afghan government. This report also discusses Afghanistan's relationship with the United States, particularly U.S. efforts to urge President Hamid Karzai, to address corruption within the Afghan government. The report also includes discussion of election fraud and corruption in Afghanistan.
Date:
November 12, 2010
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Afghanistan: U.S. Foreign Assistance
The U.S. program of assistance to Afghanistan is intended to stabilize and strengthen the Afghan economic, social, political, and security environment so as to blunt popular support for extremist forces in the region. Since 2001, nearly $52 billion has been appropriated toward this effort. This report provides a "big picture" overview of the U.S. aid program and congressional action. It describes what various aid agencies report they are doing in Afghanistan. It does not address the effectiveness of their programs.
Date:
August 12, 2010
Creator:
Tarnoff, Curt
Object Type:
Report
System:
The UNT Digital Library
Air Force KC-X Tanker Aircraft Program: Background and Issues for Congress
This report discusses issues for Congress in FY2011, which are whether to approve, reject, or modify DOD's new KC-X competition strategy, and whether to approve, reject, or modify the Air Force's request for FY2011 research and development funding for the new KC-X program.
Date:
March 12, 2010
Creator:
Gertler, Jeremiah
Object Type:
Report
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 135, No. 12, Ed. 1 Thursday, August 12, 2010
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
August 12, 2010
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
[Alex Richardson plays Werther, 1]
Photograph of Alex Richardson playing Werther in the opera "Werther" during a performance at the University of North Texas' Murchison Performing Arts Center.
Date:
[2010-11-12..2010-11-21]
Creator:
University of North Texas. College of Music.
Object Type:
Photograph
System:
The UNT Digital Library
[Alex Richardson plays Werther, 2]
Photograph of Alex Richardson playing Werther in the opera "Werther" during a performance at the University of North Texas' Murchison Performing Arts Center.
Date:
[2010-11-12..2010-11-21]
Creator:
University of North Texas. College of Music.
Object Type:
Photograph
System:
The UNT Digital Library
ALLOYING-DRIVEN PHASE STABILITY IN GROUP VB TRANSITION METALS UNDER COMPRESSION
None
Date:
July 12, 2010
Creator:
Landa, A.; Soderlind, P.; Velikokhatnyi, O. I.; Naumov, I. I.; Ruban, A. V.; Peil, O. E. et al.
Object Type:
Article
System:
The UNT Digital Library
Alphabet Soup - An Overview of Diagnostic Techniques
This report gives an overview of diagnostic techniques of "Alphabet Soup".
Date:
October 12, 2010
Creator:
Smedley, J.
Object Type:
Article
System:
The UNT Digital Library
The Altus Times (Altus, Okla.), Vol. 112, No. 26, Ed. 1 Tuesday, January 12, 2010
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 12, 2010
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 112, No. 49, Ed. 1 Friday, February 12, 2010
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 12, 2010
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 112, No. 69, Ed. 1 Friday, March 12, 2010
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 12, 2010
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 112, No. 112, Ed. 1 Wednesday, May 12, 2010
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 12, 2010
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History