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Linear and chromatic optics measurements at RHIC
Measurements of chromatic beta-beating were carried out for the first time in the RHIC accelerator during Run 2009. The analysis package developed for the LHC was used to extract the off-momentum optics for injection and top energy. Results from the beam experiments and compassion to the optics model are presented. The primary goal of the RHIC experiments were execute an on-line measurement of the optics using the tools developed for the LHC. Turn-by-turn BPM trajectories (typically 1000 turns) acquired immediately after an external dipole kick are numerically analyzed to determine the optical parameters at the location of the beam position monitors (BPMs). For chromatic optics, a similar analysis, but on a beam with finite momentum offset(s). Each optical measurement typically is calculated from multiple data sets to capture statistical variations and ensure reproducibility. The procedure of measurement and analysis is detailed in ref [1, 2]. Two dedicated experiments were performed at RHIC with protons during Run 2009. The first at injection energy and optics and the other at 250 GeV and squeezed optics. The basic RHIC parameters relevant for the two experiments are listed in Table 1.
Date:
May 23, 2010
Creator:
Aiba, M.; Calaga, R.; Aiba, M.; Tomas, R. & Vanbavinkove, G.
Object Type:
Article
System:
The UNT Digital Library
Offshore Wind Turbines - Estimated Noise from Offshore Wind Turbine, Monhegan Island, Maine: Environmental Effects of Offshore Wind Energy Development
Deep C Wind, a consortium headed by the University of Maine will test the first U.S. offshore wind platforms in 2012. In advance of final siting and permitting of the test turbines off Monhegan Island, residents of the island off Maine require reassurance that the noise levels from the test turbines will not disturb them. Pacific Northwest National Laboratory, at the request of the University of Maine, and with the support of the U.S. Department of Energy Wind Program, modeled the acoustic output of the planned test turbines.
Date:
November 23, 2010
Creator:
Aker, Pamela M.; Jones, Anthony M. & Copping, Andrea E.
Object Type:
Report
System:
The UNT Digital Library
Electron Cloud at Low Emittance in CesrTA
The Cornell Electron Storage Ring (CESR) has been reconfigured as a test accelerator (CesrTA) for a program of electron cloud (EC) research at ultra low emittance. The instrumentation in the ring has been upgraded with local diagnostics for measurement of cloud density and with improved beam diagnostics for the characterization of both the low emittance performance and the beam dynamics of high intensity bunch trains interacting with the cloud. A range of EC mitigation methods have been deployed and tested and their effectiveness is discussed. Measurements of the electron cloud's effect on the beam under a range of conditions are discussed along with the simulations being used to quantitatively understand these results.
Date:
May 23, 2010
Creator:
Alexander, J. P.; Billing, M. G.; Calvey, J.; Crittenden, J. A.; Dugan, G.; Eggert, N. et al.
Object Type:
Article
System:
The UNT Digital Library
Alvarado Star (Alvarado, Tex.), Vol. 14, No. 24, Ed. 1 Thursday, December 23, 2010
Weekly newspaper from Alvarado, Texas that includes local, state, and national news along with advertising.
Date:
December 23, 2010
Creator:
Amos, Christopher
Object Type:
Newspaper
System:
The Portal to Texas History
Atomic-level cotrol of the thermoelectric properties in polytypoid nanowires
Thermoelectric materials have generated interest as a means of increasing the efficiency of power generation through the scavenging of waste heat. Materials containing nanometer-sized structural and compositional features can exhibit enhanced thermoelectric performance due to the decoupling of certain electrical and thermal properties, but the extent to which these features can be controlled is often limited. Here we report a simple synthesis of M{sub 2}O{sub 3}(ZnO){sub n} (M = In, Ga, Fe) nanowires with controllable polytypoid structures, where the nanostructured features are tuned by adjusting the amount of metal precursor. After the introduction of nanometer-scale features (individual atomic layers and alloying), thermal and electrical measurements on single In{sub 2-x}Ga{sub x}O3(ZnO){sub n} nanowires reveal a simultaneous improvement in all contributing factors to the thermoelectric figure of merit, indicating successful modification of the nanowire transport properties.
Date:
October 23, 2010
Creator:
Andrews, Sean C.; Fardy, Melissa A.; Moore, Michael C.; Aloni, Shaoul; Zhang, Minjuan; Radmilovic, Velimir et al.
Object Type:
Article
System:
The UNT Digital Library
Guinea's New Transitional Government: Emerging Issues for U.S. Policy
This report provides background information on the government of national unity of Guinea. The report discusses issues for U.S. policy and bilateral relations with the transitional government.
Date:
April 23, 2010
Creator:
Arieff, Alexis
Object Type:
Report
System:
The UNT Digital Library
Observation of off-Hugoniot shocked states with ultrafast time resolution
We apply ultrafast single shot interferometry to determine the pressure and density of argon shocked from up to 7.8 GPa static initial pressure in a diamond anvil cell. This method enables the observation of thermodynamic states distinct from those observed in either single shock or isothermal compression experiments, and the observation of ultrafast dynamics in shocked materials. We also present a straightforward method for interpreting ultrafast shock wave data which determines the index of refraction at the shock front, and the particle and shock velocities for shock waves in transparent materials. Based on these methods, we observe shocked thermodynamic states between the room temperature isotherm of argon and the shock adiabat of cryogenic argon at final shock pressures up to 28 GPa.
Date:
February 23, 2010
Creator:
Armstrong, M; Crowhurst, J; Bastea, S & Zaug, J
Object Type:
Article
System:
The UNT Digital Library
TUNING SILICON NANORODS FOR ANODES OF LI-ION RECHARGEABLE BATTERIES
Silicon is a promising anode material for Li-ion batteries in regarding of high capacity, low cost and safety, but it suffers poor cycling stability due to the pulverization induced by severe volume expansion/shrinkage (297%) during lithium insertion/extraction. In our previous investigation on aluminum nanorods anodes, it is found the selection of substrates in which Al nanorods grown plays the role in prevention of pulverization resulting in the increase of cycling life. Adapting this knowledge, we investigated the Si based nanorods anodes by tuning its composition and element distribution. Our results show that although the Si nanorods demonstrated higher initial anodic capacity of 1500 mAh/g, it diminished after 50 cycles due to morphology change and pulverization. By codepositing Cu, the Si-Cu composite nanorods demonstrated sustainable capacity of 500 mAh/g in 100 cycles attributing to its flexible and less brittle nature.
Date:
November 23, 2010
Creator:
Au, M.
Object Type:
Article
System:
The UNT Digital Library
Novel Geometries for the LHC Crab Cavity
The planned luminosity upgrade to LHC is likely to necessitate a large crossing angle and a local crab crossing scheme. For this scheme crab cavities align bunches prior to collision. The scheme requires at least four such cavities, a pair on each beam line either side of the interaction point (IP). Upstream cavities initiate rotation and downstream cavities cancel rotation. Cancellation is usually done at a location where the optics has re-aligned the bunch. The beam line separation near the IP necessitates a more compact design than is possible with elliptical cavities such as those used at KEK. The reduction in size must be achieved without an increase in the operational frequency to maintain compatibility with the long bunch length of the LHC. This paper proposes a suitable superconducting variant of a four rod coaxial deflecting cavity (to be phased as a crab cavity), and presents analytical models and simulations of suitable designs.
Date:
May 23, 2010
Creator:
B. Hall, G. Burt, C. Lingwood, R. Rimmer, H. Wang
Object Type:
Article
System:
The UNT Digital Library
Senior Recital: 2010-03-23 - Brandon Bahn, percussion
Access:
Use of this item is restricted to the UNT Community
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Bachelor of Music (BM) degree.
Date:
March 23, 2010
Creator:
Bahn, Brandon
Object Type:
Sound
System:
The UNT Digital Library
RHIC Spin Flipper Commissioning Status
The commissioning of the RHIC spin flipper in the RHIC Blue ring during the RHIC polarized proton run in 2009 showed the detrimental effects of global vertical coherent betatron oscillation induced by the 2-AC dipole plus 4-DC dipole configuration. This global orbital coherent oscillation of the RHIC beam in the Blue ring in the presence of collision modulated the beam-beam interaction between the two RHIC beams and affected Yellow beam polarization. The experimental data at injection with different spin tunes by changing the snake current also demonstrated that it was not possible to induce a single isolated spin resonance with the global vertical coherent betatron oscillation excited by the two AC dipoles. Hence, a new design was proposed to eliminate the coherent vertical betatron oscillation outside the spin flipper by adding three additional AC dipoles. This paper presents the experimental results as well as the new design.
Date:
May 23, 2010
Creator:
Bai, M.; Meot, F.; Dawson, C.; Oddo, P.; Pai, C.; Pile, P. et al.
Object Type:
Article
System:
The UNT Digital Library
Faculty Recital: 2010-10-23 - Tony Baker, trombone
Access:
Use of this item is restricted to the UNT Community
A faculty recital performed at the UNT College of Music Recital Hall.
Date:
October 23, 2010
Creator:
Baker, Tony (Trombonist)
Object Type:
Sound
System:
The UNT Digital Library
Conversation about Ahom migration
This is a conversation about the coming of Ahoms in Assam and fights with Boro rulers. Dialect: Standard Boro
Date:
December 23, 2010
Creator:
Basumatary, Prafulla
Object Type:
Sound
System:
The UNT Digital Library
Conversation about Boro naming systems
Conversation on the origin of Boro nomenclature. Dialect: Standard Boro
Date:
December 23, 2010
Creator:
Basumatary, Prafulla
Object Type:
Sound
System:
The UNT Digital Library
Conversation about the fight between Boro rulers and Ahom rulers
This is a conversation on the fight between Boro rulers and Ahom rulers. Dialect: Standard Boro
Date:
December 23, 2010
Creator:
Basumatary, Prafulla
Object Type:
Sound
System:
The UNT Digital Library
Conversation about the kingdom of Boro rulers
This is a conversation about the Boro rulers and their kingdom of the past. Dialect: Standard Boro
Date:
December 23, 2010
Creator:
Basumatary, Prafulla
Object Type:
Sound
System:
The UNT Digital Library
Conversation about the past Boro kings
This is a conversation about the Boro rulers, namely, Naranarayan and Chilarai. Dialect: Standard Boro
Date:
December 23, 2010
Creator:
Basumatary, Prafulla
Object Type:
Sound
System:
The UNT Digital Library
Conversation about the relation between the Boros and the Bhutanese
This is a conversation about the historical relationships between the Boro rulers and the Bhutanese rulers. Dialect: Standard Boro
Date:
December 23, 2010
Creator:
Basumatary, Prafulla
Object Type:
Sound
System:
The UNT Digital Library
Political Status of Puerto Rico: Options for Congress
This report discusses the current U.S.-Puerto Rico relationship, the history of said relationship, and the current political state of Puerto Rico, as well as relevant pieces of U.S. Congressional legislation concerning Puerto Rico.
Date:
April 23, 2010
Creator:
Bea, Keith & Garrett, R. Sam
Object Type:
Report
System:
The UNT Digital Library
South Texas Catholic (Corpus Christi, Tex.), Vol. 45, No. 8, Ed. 1 Friday, April 23, 2010
Semi-monthly newspaper from Corpus Christi, Texas published by the Diocese of Corpus Christi that includes news of interest to Diocese members along with advertising.
Date:
April 23, 2010
Creator:
Beaton, Paula J.
Object Type:
Newspaper
System:
The Portal to Texas History
2009 ALCF annual report.
This year the Argonne Leadership Computing Facility (ALCF) delivered nearly 900 million core hours of science. The research conducted at their leadership class facility touched our lives in both minute and massive ways - whether it was studying the catalytic properties of gold nanoparticles, predicting protein structures, or unearthing the secrets of exploding stars. The authors remained true to their vision to act as the forefront computational center in extending science frontiers by solving pressing problems for our nation. Our success in this endeavor was due mainly to the Department of Energy's (DOE) INCITE (Innovative and Novel Computational Impact on Theory and Experiment) program. The program awards significant amounts of computing time to computationally intensive, unclassified research projects that can make high-impact scientific advances. This year, DOE allocated 400 million hours of time to 28 research projects at the ALCF. Scientists from around the world conducted the research, representing such esteemed institutions as the Princeton Plasma Physics Laboratory, National Institute of Standards and Technology, and European Center for Research and Advanced Training in Scientific Computation. Argonne also provided Director's Discretionary allocations for research challenges, addressing such issues as reducing aerodynamic noise, critical for next-generation 'green' energy systems. Intrepid - the …
Date:
November 23, 2010
Creator:
Beckman, P.; Martin, D. & Drugan, C.
Object Type:
Report
System:
The UNT Digital Library
Colombia: Issues for Congress
This report provides an overview of recent political developments in Colombia, including the administration of President Uribe (2002-2010), continuing into the election of President Juan Manuel Santos. It discusses the political issues including Colombia's longstanding conflict with internal armed groups and ongoing challenges such as human rights, demobilization and displacement, drug trends, and Colombia's regional relations. The report also lays out issues for Congress including various plans for addressing those issues.
Date:
April 23, 2010
Creator:
Beittel, June S.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Herman L. Bell, February 23, 2010
The National Museum of the Pacific War presents an oral interview with Herman L. Bell. Bell worked in a shipyard in California at the beginning of the war and describes his duties as a welder. He joined the Navy in April 1943 and discusses his time in boot camp at Farragut, Idaho and the additional training that he received as a firefighter. Bell was sent to the USS Independence (CVL-22). He describes his duties and some of the work he performed. Bell discusses when his ship was hit with a torpedo off Tarawa and the damage control work he performed including how he helped save a trapped sailor. He also discusses an incident when emergency repairs were performed during a typhoon and another when a large bomb broke free from its restraints. Bell also discusses seeing the massive flyover during the surrender ceremony in Tokyo Bay. He left the service in November 1945.
Date:
February 23, 2010
Creator:
Bell, Herman L.
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Herman L. Bell, February 23, 2010
The National Museum of the Pacific War presents an oral interview with Herman L. Bell. Bell worked in a shipyard in California at the beginning of the war and describes his duties as a welder. He joined the Navy in April 1943 and discusses his time in boot camp at Farragut, Idaho and the additional training that he received as a firefighter. Bell was sent to the USS Independence (CVL-22). He describes his duties and some of the work he performed. Bell discusses when his ship was hit with a torpedo off Tarawa and the damage control work he performed including how he helped save a trapped sailor. He also discusses an incident when emergency repairs were performed during a typhoon and another when a large bomb broke free from its restraints. Bell also discusses seeing the massive flyover during the surrender ceremony in Tokyo Bay. He left the service in November 1945.
Date:
February 23, 2010
Creator:
Bell, Herman L.
Object Type:
Text
System:
The Portal to Texas History