University of Texas at Brownsville Operating Budget: 2012 (open access)

University of Texas at Brownsville Operating Budget: 2012

Proposed budget for University of Texas at Brownsville outlining projected income and expenditures, with supporting documentation for fiscal year 2012.
Date: August 25, 2011
Creator: University of Texas at Brownsville
Object Type: Book
System: The Portal to Texas History
NNSA ASC Exascale Environment Planning, Applications Working Group, Report February 2011 (open access)

NNSA ASC Exascale Environment Planning, Applications Working Group, Report February 2011

The scope of the Apps WG covers three areas of interest: Physics and Engineering Models (PEM), multi-physics Integrated Codes (IC), and Verification and Validation (V&V). Each places different demands on the exascale environment. The exascale challenge will be to provide environments that optimize all three. PEM serve as a test bed for both model development and 'best practices' for IC code development, as well as their use as standalone codes to improve scientific understanding. Rapidly achieving reasonable performance for a small team is the key to maintaining PEM innovation. Thus, the environment must provide the ability to develop portable code at a higher level of abstraction, which can then be tuned, as needed. PEM concentrate their computational footprint in one or a few kernels that must perform efficiently. Their comparative simplicity permits extreme optimization, so the environment must provide the ability to exercise significant control over the lower software and hardware levels. IC serve as the underlying software tools employed for most ASC problems of interest. Often coupling dozens of physics models into very large, very complex applications, ICs are usually the product of hundreds of staff-years of development, with lifetimes measured in decades. Thus, emphasis is placed on portability, …
Date: February 25, 2011
Creator: Still, C. H.; Arsenlis, A.; Bond, R. B.; Steinkamp, M. J.; Swaminarayan, S.; Womble, D. E. et al.
Object Type: Report
System: The UNT Digital Library
Survey of SRF guns (open access)

Survey of SRF guns

Developing Superconducting RF (SRF) electron guns is an active field with several laboratories working on different gun designs. While the first guns were based on elliptic cavity geometries, Quarter Wave Resonator (QWR) option is gaining popularity. QWRs are especially well suited for producing beams with high charge per bunch. In this talk we will describe recent progress in developing both types of SRF guns. SRF guns made excellent progress in the last two years. Several guns generated beams and one, at HZDR, injected beam into an accelerator. By accomplishing this, HZDR/ELBE gun demonstrated feasibility of the SRF gun concept with a normal-conducting Cs{sub 2}Te cathode. The cathode demonstrated very good performance with the lifetime of {approx}1 year. However, for high average current/high bunch charge operation CsK{sub 2}Sb is preferred as it needs green lasers, unlike UV laser for the Cs{sub 2}Te, which makes it easier to build laser/optics systems. Other high QE photocathodes are being developed for SRF guns, most notably diamond-amplified photocathode. Several QWR guns are under development with one producing beam already. They are very promising for high bunch charge operation. The field is very active and we should expect more good results soon.
Date: July 25, 2011
Creator: Belomestnykh, S.
Object Type: Article
System: The UNT Digital Library
TECHNETIUM SORPTION MEDIA REVIEW (open access)

TECHNETIUM SORPTION MEDIA REVIEW

This report presents information and references to aid in the selection of 99Tc sorption media for feasibility studies regarding the removal of 99Tc from Hanford's low activity waste. The report contains literature search material for sorption media (including ion exchange media) for the most tested media to date, including SuperLig 639, Reillex HPQ, TAM (Kruion), Purolite A520E and A530E, and Dowex 1X8. The U.S. Department of Energy (DOE), Office of River Protection (ORP) is responsible for management and completion of the River Protection Project (RPP) mission, which comprises both the Hanford Site tank farms and the Waste Treatment and Immobilization Plant (WTP). The RPP mission is to store, retrieve and treat Hanford's tank waste; store and dispose of treated wastes; and close the tank farm waste management areas and treatment facilities in a safe, environmentally compliant, cost-effective and energy-effective manner.
Date: August 25, 2011
Creator: JB, DUNCAN; SE, KELLY; RA, ROBBINS; RD, ADAMS; MA, THORSON & CC, HAASS
Object Type: Report
System: The UNT Digital Library
National Ignition Facility and Managing Location, Component, and State (open access)

National Ignition Facility and Managing Location, Component, and State

The National Ignition Facility (NIF) at the Lawrence Livermore National Laboratory is a stadium-sized facility that contains a 192-beam, 1.8-Megajoule, 500-Terawatt, ultraviolet laser system coupled with a 10-meter diameter target chamber. There are over 6,200 Line Replaceable Units (LRUs) comprised of more than 104,000 serialized parts that make up the NIF. Each LRU is a modular unit typically composed of a mechanical housing, laser optics (glass, lenses, or mirrors), and utilities. To date, there are more than 120,000 data sets created to characterize the attributes of these parts. Greater than 51,000 Work Permits have been issued to install, maintain, and troubleshoot the components. One integrated system is used to manage these data, and more. The Location Component and State (LoCoS) system is a web application built using Java Enterprise Edition technologies and is accessed by over 1,200 users. It is either directly or indirectly involved with each aspect of NIF work activity, and interfaces with ten external systems including the Integrated Computer Control System (ICCS) and the Laser Performance Operations Model (LPOM). Besides providing business functionality, LoCoS also acts as the NIF enterprise service bus. In this role, numerous integration approaches had to be adopted including: file exchange, database sharing, …
Date: July 25, 2011
Creator: Foxworthy, C.; Fung, T.; Beeler, R.; Li, J.; Dugorepec, J. & Chang, C.
Object Type: Article
System: The UNT Digital Library
Measurements of Form Factors with the BaBar Experiment (open access)

Measurements of Form Factors with the BaBar Experiment

Selected recent results on measurements of form factors by the BaBar Collaboration are reviewed, including e{sup +}e{sup -} {yields} {eta}{prime}{gamma}, leptonic and semileptonic charm decays from data collected at or near the {Upsilon}(4S) resonance.
Date: August 25, 2011
Creator: Li, Selina Z.
Object Type: Article
System: The UNT Digital Library
Finite size effect on spread of resonance frequencies in arrays of coupled vortices (open access)

Finite size effect on spread of resonance frequencies in arrays of coupled vortices

Dynamical properties of magnetic vortices in arrays of magnetostatically coupled ferromagnetic disks are studied by means of a broadband ferromagnetic-resonance (FMR) setup. Magnetic force microscopy and magnetic transmission soft X-ray microscopy are used to image the core polarizations and the chiralities which are both found to be randomly distributed. The resonance frequency of vortex-core motion strongly depends on the magnetostatic coupling between the disks. The parameter describing the relative broadening of the absorption peak observed in the FMR transmission spectra for a given normalized center-to-center distance between the elements is shown to depend on the size of the array.
Date: January 25, 2011
Creator: Vogel, Andreas; Drews, André; Im, Mi-Young; Fischer, Peter & Meier, Guido
Object Type: Article
System: The UNT Digital Library
Using Cool Roofs to Reduce Energy Use, Greenhouse Gas Emissions, and Urban Heat-island Effects: Findings from an India Experiment (open access)

Using Cool Roofs to Reduce Energy Use, Greenhouse Gas Emissions, and Urban Heat-island Effects: Findings from an India Experiment

Cool roofs, cool pavements, and urban vegetation reduce energy use in buildings, lower local air pollutant concentrations, and decrease greenhouse gas emissions from urban areas. This report summarizes the results of a detailed monitoring project in India and related simulations of meteorology and air quality in three developing countries. The field results quantified direct energy savings from installation of cool roofs on individual commercial buildings. The measured annual energy savings potential from roof-whitening of previously black roofs ranged from 20-22 kWh/m2 of roof area, corresponding to an air-conditioning energy use reduction of 14-26% in commercial buildings. The study estimated that typical annual savings of 13-14 kWh/m2 of roof area could be achieved by applying white coating to uncoated concrete roofs on commercial buildings in the Metropolitan Hyderabad region, corresponding to cooling energy savings of 10-19%. With the assumption of an annual increase of 100,000 square meters of new roof construction for the next 10 years in the Metropolitan Hyderabad region, the annual cooling energy savings due to whitening concrete roof would be 13-14 GWh of electricity in year ten alone, with cumulative 10-year cooling energy savings of 73-79 GWh for the region. The estimated savings for the entire country would …
Date: May 25, 2011
Creator: Akbari, Hashem; Xu, Tengfang; Taha, Haider; Wray, Craig; Sathaye, Jayant; Garg, Vishal et al.
Object Type: Report
System: The UNT Digital Library
MCNP5 CALCULATIONS REPLICATING ARH-600 NITRATE DATA (open access)

MCNP5 CALCULATIONS REPLICATING ARH-600 NITRATE DATA

This report serves to extend the previous document: 'MCNP Calculations Replicating ARH-600 Data' by replicating the nitrate curves found in ARH-600. This report includes the MCNP models used, the calculated critical dimension for each analyzed parameter set, and the resulting data libraries for use with the CritView code. As with the ARH-600 data, this report is not meant to replace the analysis of the fissile systems by qualified criticality personnel. The M CNP data is presented without accounting for the statistical uncertainty (although this is typically less than 0.001) or bias and, as such, the application of a reasonable safety margin is required. The data that follows pertains to the uranyl nitrate and plutonium nitrate spheres, infinite cylinders, and infinite slabs of varying isotopic composition, reflector thickness, and molarity. Each of the cases was modeled in MCNP (version 5.1.40), using the ENDF/B-VI cross section set. Given a molarity, isotopic composition, and reflector thickness, the fissile concentration and diameter (or thicknesses in the case of the slab geometries) were varied. The diameter for which k-effective equals 1.00 for a given concentration could then be calculated and graphed. These graphs are included in this report. The pages that follow describe the regions …
Date: October 25, 2011
Creator: Finfrock, S. H.
Object Type: Report
System: The UNT Digital Library
Ground Movement in SSRL Ring (open access)

Ground Movement in SSRL Ring

Users of the Stanford Synchrotron Radiation Lightsource (SSRL) are being affected by diurnal motion of the synchrotron's storage ring, which undergoes structural changes due to outdoor temperature fluctuations. In order to minimize the effects of diurnal temperature fluctuations, especially on the vertical motion of the ring floor, scientists at SSRL tried three approaches: painting the storage ring white, covering the asphalt in the middle of the ring with highly reflective Mylar and installing Mylar on a portion of the ring roof and walls. Vertical motion in the storage ring is measured by a Hydrostatic Leveling System (HLS), which calculates the relative height of water in a pipe that extends around the ring. The 24-hr amplitude of the floor motion was determined using spectral analysis of HLS data, and the ratio of this amplitude before and after each experiment was used to quantitatively determine the efficacy of each approach. The results of this analysis showed that the Mylar did not have any significant effect on floor motion, although the whitewash project did yield a reduction in overall HLS variation of 15 percent. However, further analysis showed that the reduction can largely be attributed to a few local changes rather than an …
Date: August 25, 2011
Creator: Sunikumar, Nikita & /SLAC, /UCLA
Object Type: Report
System: The UNT Digital Library
DYNA3D/ParaDyn Regression Test Suite Inventory (open access)

DYNA3D/ParaDyn Regression Test Suite Inventory

The following table constitutes an initial assessment of feature coverage across the regression test suite used for DYNA3D and ParaDyn. It documents the regression test suite at the time of production release 10.1 in September 2010. The columns of the table represent groupings of functionalities, e.g., material models. Each problem in the test suite is represented by a row in the table. All features exercised by the problem are denoted by a check mark in the corresponding column. The definition of ''feature'' has not been subdivided to its smallest unit of user input, e.g., algorithmic parameters specific to a particular type of contact surface. This represents a judgment to provide code developers and users a reasonable impression of feature coverage without expanding the width of the table by several multiples. All regression testing is run in parallel, typically with eight processors. Many are strictly regression tests acting as a check that the codes continue to produce adequately repeatable results as development unfolds, compilers change and platforms are replaced. A subset of the tests represents true verification problems that have been checked against analytical or other benchmark solutions. Users are welcomed to submit documented problems for inclusion in the test suite, …
Date: January 25, 2011
Creator: Lin, J I
Object Type: Report
System: The UNT Digital Library
Growth of detector-grade CZT by Traveling Heater Method (THM): An advancement (open access)

Growth of detector-grade CZT by Traveling Heater Method (THM): An advancement

In this present work we report the growth of Cd{sub 0.9}Zn{sub 0.1}Te doped with In by a modified THM technique. It has been demonstrated that by controlling the microscopically flat growth interface, the size distribution and concentration can be drastically reduced in the as-grown ingots. This results in as-grown detector-grade CZT by the THM technique. The three-dimensional size distribution and concentrations of Te inclusions/precipitations were studied. The size distributions of the Te precipitations/inclusions were observed to be below the 10-{micro}m range with the total concentration less than 10{sup 5} cm{sup -3}. The relatively low value of Te inclusions/precipitations results in excellent charge transport properties of our as-grown samples. The ({mu}{tau}){sub e} values for different as-grown samples varied between 6-20 x 10{sup -3} cm{sup 2}/V. The as-grown samples also showed fairly good detector response with resolution of {approx}1.5%, 2.7% and about 3.8% at 662 keV for quasi-hemispherical geometry for detector volumes of 0.18 cm{sup 3}, 1 cm{sup 3} and 4.2 cm{sup 3}, respectively.
Date: April 25, 2011
Creator: ROY, U.N.; JAMES, R.; WEILER, S.; STEIN, J.; GROZA, M.; BURGER, A. et al.
Object Type: Article
System: The UNT Digital Library
TOF-SIMS Analysis of Hydrogen in Niobium, From 160 deg. K to 475 deg. K (open access)

TOF-SIMS Analysis of Hydrogen in Niobium, From 160 deg. K to 475 deg. K

Niobium (Nb) is the material of choice for superconducting radio frequency (SRF) cavities due to its high critical temperature and critical magnetic field. Interstitial impurity elements such as H directly influence the efficiency of these cavities. Quantification of H in Nb is difficult since H is extremely mobile in Nb with a very high diffusion coefficient even at room temperature. In the presented work, Time of Flight Secondary Ion Mass Spectrometry (TOF-SIMS) was used to characterize H in Nb over a wide temperature range (160°K to 475°K) in situ to check for changes in mobility. Multiple experiments showed that as the specimen temperature is decreased below 300 °K, the H/Nb intensity changes by first increasing and then decreasing drastically at temperatures below 200°K. As specimen temperature is increased from 300°K to 450°K, the H/Nb intensity decreases. Remarkably, the H intensity with respect to Nb increases with time at 475°K (approximately 200°C). Correlation between this data and the H-Nb phase diagram appears to account for the H behaviour.
Date: July 25, 2011
Creator: P. Maheshwari, A.D. Batchelor, D.P. Griffis, F.A. Stevie, C. Zhou, G. Ciovati, R. Myneni, M. Rigsbee
Object Type: Article
System: The UNT Digital Library
Demonstration of a narrow energy spread, ~0.5 GeV electron beam from a two-stage Laser Wake Accelerator (open access)

Demonstration of a narrow energy spread, ~0.5 GeV electron beam from a two-stage Laser Wake Accelerator

None
Date: March 25, 2011
Creator: POllock, B. B.; Clayton, C. E.; Ralph, J. E.; Albert, F.; Davidson, A.; Divol, L. et al.
Object Type: Article
System: The UNT Digital Library
Economic Development: Efficiency and Effectiveness of Fragmented Programs Are Unclear (open access)

Economic Development: Efficiency and Effectiveness of Fragmented Programs Are Unclear

Testimony issued by the Government Accountability Office with an abstract that begins "This testimony discusses the potential for duplication and fragmentation in economic development programs. In March 2011 and more recently in May 2011 we reported on potential duplication among federal economic development programs. We are involved in ongoing work focusing on economic development programs because if they are administered efficiently and effectively, they can contribute to the well-being of our nation's economy at the least cost to taxpayers. Absent a common definition for economic development, we had previously developed a list of nine activities most often associated with economic development. These activities include planning and developing strategies for job creation and retention, developing new markets for existing products, building infrastructure by constructing roads and sewer systems to attract industry to undeveloped areas, and establishing business incubators to provide facilities for new businesses' operations. Our recent work includes information on 80 economic development programs at four agencies--the Departments of Commerce (Commerce), Housing and Urban Development (HUD), and Agriculture (USDA) and the Small Business Administration (SBA). SBA administers 19 of the 80 programs. According to the agencies, funding provided for these 80 programs in fiscal year 2010 amounted to $6.2 billion, …
Date: May 25, 2011
Creator: United States. Government Accountability Office.
Object Type: Text
System: The UNT Digital Library
Global Transcriptome Response to Ionic Liquid by a Tropical Rain Forest Soil Bacterium, Enterobacter Lignolyticus scf1 (open access)

Global Transcriptome Response to Ionic Liquid by a Tropical Rain Forest Soil Bacterium, Enterobacter Lignolyticus scf1

None
Date: July 25, 2011
Creator: Khudyakov, J. I.; D'haeseleer, P.; Borglin, S. E.; DeAngelis, K. M.; Woo, H.; Lindquist, E. A. et al.
Object Type: Article
System: The UNT Digital Library
Medicaid and CHIP Maintenance of Effort (MOE): Requirements and Responses (open access)

Medicaid and CHIP Maintenance of Effort (MOE): Requirements and Responses

This report summarizes the MOE requirements enacted under American Recovery and Reinvestment Act of 2009 and the Patient Protection and Affordable Care Act as modified by the Health Care and Education Reconciliation Act of 2010 and what these requirements have meant for states in terms of their actions to restrict Medicaid and/or CHIP eligibility. It also summarizes recent legislative activity to repeal the MOE requirements.
Date: May 25, 2011
Creator: Baumrucker, Evelyne P.
Object Type: Report
System: The UNT Digital Library
Radoptic x-ray detection with picosecond resolution (open access)

Radoptic x-ray detection with picosecond resolution

None
Date: July 25, 2011
Creator: Lowry, M. E.; Vernon, S. P.; Steele, P. T.; Bennett, C. V.; Hernandez, V. J.; Moran, B. et al.
Object Type: Article
System: The UNT Digital Library
Nuclear Nonproliferation and Arms Control Primer Prepared for the Blue Ribbon Commission on America’s Nuclear Future (open access)

Nuclear Nonproliferation and Arms Control Primer Prepared for the Blue Ribbon Commission on America’s Nuclear Future

To provide a brief overview of key arms control and nonproliferation arrangements for the layperson that may be relevant to the Commission's comprehensive review of policies for managing the back end of the nuclear fuel cycle. Primer would be published by the Commission and made publicly available, probably as an appendix to a larger Commission report.
Date: May 25, 2011
Creator: Williams, Laura S.
Object Type: Report
System: The UNT Digital Library
EVALUATION OF ALTERNATIVE STRONIUM AND TRANSURANIC SEPARATION PROCESSES (open access)

EVALUATION OF ALTERNATIVE STRONIUM AND TRANSURANIC SEPARATION PROCESSES

In order to meet contract requirements on the concentrations of strontium-90 and transuranic isotopes in the immobilized low-activity waste, strontium-90 and transuranics must be removed from the supernate of tanks 241-AN-102 and 241-AN-107. The process currently proposed for this application is an in-tank precipitation process using strontium nitrate and sodium permanganate. Development work on the process has not proceeded since 2005. The purpose of the evaluation is to identify whether any promising alternative processes have been developed since this issue was last examined, evaluate the alternatives and the baseline process, and recommend which process should be carried forward.
Date: April 25, 2011
Creator: CS, SMALLEY
Object Type: Report
System: The UNT Digital Library
B Lifetimes and X,Y,Z States at the Tevatron (open access)

B Lifetimes and X,Y,Z States at the Tevatron

A measurement of b-hadron lifetimes in the fully reconstructed decay modes B{sup +} {yields} J/{psi}K{sup +}, B{sup 0} {yields} J/{psi}K*{sup 0}, B{sup 0} {yields} J/{psi}K{sub S}{sup 0}, and {Lambda}{sub b}{sup 0} {yields} J/{psi} {Lambda}{sup 0} is reported using data corresponding to an integrated luminosity of 4.3 fb{sup -1}, collected by the CDF II detector at the Fermilab Tevatron. The measured values are {tau}(B{sup +}) = 1.639 {+-} 0.009(stat) {+-} 0.009(syst) ps, {tau}(B{sup 0}) = 1.507 {+-} 0.010(stat) {+-} 0.008(syst) ps and {tau}({Lambda}{sub b}{sup 0}) = 1.537 {+-} 0.045(stat) {+-} 0.014(syst) ps. The lifetime ratios are {tau}(B{sup +})/{tau}(B{sup 0}) - 1.088 {+-} 0.009(stat) {+-} 0.004(syst) and {tau}({Lambda}{sub b}{sup 0})/{tau}(B{sup 0}) = 1.020 {+-} 0.030(stat) {+-} 0.008(syst). These are the most precise measurements of these quantities from a single experiment. Observation is also reported for a structure near the J/{psi}{phi} threshold, in B{sup +} to J/{psi}{phi}K{sup +} decays with an integrated luminosity of 6.0 fb{sup -1} and a statistical significance of 5 standard deviations. There are 19 {+-} 6 events observed for this structure at a mass of 4143.4{sub -3.0}{sup +2.9} {+-} 0.6 MeV/c{sup 2} and a width of 15.3{sub -6.1}{sup +10.4} {+-} 2.5 MeV/c{sup 2}.
Date: May 25, 2011
Creator: Fernandez, Juan Pablo
Object Type: Article
System: The UNT Digital Library
Oracle Database DBFS Hierarchical Storage Overview (open access)

Oracle Database DBFS Hierarchical Storage Overview

The National Ignition Facility (NIF) at the Lawrence Livermore National Laboratory creates large numbers of images during each shot cycle for the analysis of optics, target inspection and target diagnostics. These images must be readily accessible once they are created and available for the 30 year lifetime of the facility. The Livermore Computing Center (LC) runs a High Performance Storage System (HPSS) that is capable of storing NIF's estimated 1 petabyte of diagnostic images at a fraction of what it would cost NIF to operate its own automated tape library. With Oracle 11g Release 2 database, it is now possible to create an application transparent, hierarchical storage system using the LC's HPSS. Using the Oracle DBMS-LOB and DBMS-DBFS-HS packages a SecureFile LOB can now be archived to storage outside of the database and accessed seamlessly through a DBFS 'link'. NIF has chosen to use this technology to implement a hierarchical store for its image based SecureFile LOBs. Using a modified external store and DBFS links, files are written to and read from a disk 'staging area' using Oracle's backup utility. Database external procedure calls invoke OS based scripts to manage a staging area and the transfer of the backup files …
Date: July 25, 2011
Creator: Rivenes, A
Object Type: Article
System: The UNT Digital Library
Optical Basicity and Nepheline Crystallization in High Alumina Glasses (open access)

Optical Basicity and Nepheline Crystallization in High Alumina Glasses

The purpose of this study was to find compositions that increase waste loading of high-alumina wastes beyond what is currently acceptable while avoiding crystallization of nepheline (NaAlSiO4) on slow cooling. Nepheline crystallization has been shown to have a large impact on the chemical durability of high-level waste glasses. It was hypothesized that there would be some composition regions where high-alumina would not result in nepheline crystal production, compositions not currently allowed by the nepheline discriminator. Optical basicity (OB) and the nepheline discriminator (ND) are two ways of describing a given complex glass composition. This report presents the theoretical and experimental basis for these models. They are being studied together in a quadrant system as metrics to explore nepheline crystallization and chemical durability as a function of waste glass composition. These metrics were calculated for glasses with existing data and also for theoretical glasses to explore nepheline formation in Quadrant IV (passes OB metric but fails ND metric), where glasses are presumed to have good chemical durability. Several of these compositions were chosen, and glasses were made to fill poorly represented regions in Quadrant IV. To evaluate nepheline formation and chemical durability of these glasses, quantitative X-ray diffraction (XRD) analysis and …
Date: February 25, 2011
Creator: Rodriguez, Carmen P.; McCloy, John S.; Schweiger, M. J.; Crum, Jarrod V. & Winschell, Abigail E.
Object Type: Report
System: The UNT Digital Library
Superconducting 112 MHz QWR electron gun (open access)

Superconducting 112 MHz QWR electron gun

Brookhaven National Laboratory and Niowave, Inc. have designed and fabricated a superconducting 112 MHz quarter-wave resonator (QWR) electron gun. The first cold test of the QWR cryomodule has been completed at Niowave. The paper describes the cryomodule design, presents the cold test results, and outline plans to upgrade the cryomodule. Future experiments include studies of different photocathodes and use for the coherent electron cooling proof-of-principle experiment. Two cathode stalk options, one for multi-alkali photocathodes and the other one for a diamond-amplified photocathode, are discussed. A quarter-wave resonator concept of superconducting RF (SRF) electron gun was proposed at BNL for electron cooling hadron beams in RHIC. QWRs can be made sufficiently compact even at low RF frequencies (long wavelengths). The long wavelength allows to produce long electron bunches, thus minimizing space charge effects and enabling high bunch charge. Also, such guns should be suitable for experiments requiring high average current electron beams. A 112 MHz QWR gun was designed, fabricated, and cold-tested in collaboration between BNL and Niowave. This is the lowest frequency SRF gun ever tested successfully. In this paper we describe the gun design and fabrication, present the cold test results, and outline our plans. This gun will also …
Date: July 25, 2011
Creator: Belomestnykh, S.; Ben-Zvi, Ilan; Boulware, C. H.; Chang, X.; Grimm, T. L.; Rao, T. et al.
Object Type: Article
System: The UNT Digital Library