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Practical Thermal Evaluation Methods For HAC Fire Analysis In Type B Radiaoactive Material (RAM) Packages
Title 10 of the United States Code of Federal Regulations Part 71 for the Nuclear Regulatory Commission (10 CFR Part 71.73) requires that Type B radioactive material (RAM) packages satisfy certain Hypothetical Accident Conditions (HAC) thermal design requirements to ensure package safety during accidental fire conditions. Compliance with thermal design requirements can be met by prototype tests, analyses only or a combination of tests and analyses. Normally, it is impractical to meet all the HAC using tests only and the analytical methods are too complex due to the multi-physics non-linear nature of the fire event. Therefore, a combination of tests and thermal analyses methods using commercial heat transfer software are used to meet the necessary design requirements. The authors, along with his other colleagues at Savannah River National Laboratory in Aiken, SC, USA, have successfully used this 'tests and analyses' approach in the design and certification of several United States' DOE/NNSA certified packages, e.g. 9975, 9977, 9978, 9979, H1700, and Bulk Tritium Shipping Package (BTSP). This paper will describe these methods and it is hoped that the RAM Type B package designers and analysts can use them for their applications.
Date:
March 28, 2013
Creator:
Abramczyk, Glenn; Hensel, Stephen J & Gupta, Narendra K.
Object Type:
Article
System:
The UNT Digital Library
Performance of the new EBIS preinjector
The construction and initial commissioning phase of a new heavy ion preinjector was completed at Brookhaven in September, 2010, and the preinjector is now operational. This preinjector, using an EBIS source to produce high charge state heavy ions, provided helium and neon ion beams for use at the NASA Space Radiation Laboratory in the Fall of 2010, and gold and uranium beams are being commissioned during the 2011 run cycle for use in RHIC. The EBIS operates with an electron beam current of up to 10 A, to produce mA level currents in 10-40 {micro}s beam pulses. The source is followed by an RFQ and IH linac to accelerate ions with q/m > 0.16 to an energy of 2 MeV/amu, for injection into the Booster synchrotron. The performance of the preinjector is presented, including initial operational experience for the NASA and RHIC programs.
Date:
March 28, 2011
Creator:
Alessi, J.; Beebe, E.; Binello, S.; Gardner, C.; Gould, O.; Hoff, L. et al.
Object Type:
Article
System:
The UNT Digital Library
Administrative Appeals in the Bureau of Land Management and the Forest Service
This report describes Congressional interest in the Bureau of Land Management's (BLM) appeal process due to rumors that it affects the BLM's capacity to handle various resources. Moreover, the report defines what an administrative appeal is, and describes the process required to undertake one. The report also lists the various types of administrative appeals.
Date:
March 28, 2012
Creator:
Alexander, Katrina
Object Type:
Report
System:
The UNT Digital Library
The Gray Wolf and the Endangered Species Act: A Brief Legal History
This report provides a brief history of the laws, regulations, and lawsuits related to the wolf's protected status.
Date:
March 28, 2011
Creator:
Alexander, Kristina
Object Type:
Report
System:
The UNT Digital Library
The machine protection system for the R&D energy recovery LINAC
The Machine Protection System (MPS) is a device-safety system that is designed to prevent damage to hardware by generating interlocks, based upon the state of input signals generated by selected sub-systems. It protects all the key machinery in the R&D Project called the Energy Recovery LINAC (ERL) against the high beam current. The MPS is capable of responding to a fault with an interlock signal within several microseconds. The ERL MPS is based on a National Instruments CompactRIO platform, and is programmed by utilizing National Instruments' development environment for a visual programming language. The system also transfers data (interlock status, time of fault, etc.) to the main server. Transferred data is integrated into the pre-existing software architecture which is accessible by the operators. This paper will provide an overview of the hardware used, its configuration and operation, as well as the software written both on the device and the server side.
Date:
March 28, 2011
Creator:
Altinbas, Z.; Kayran, D.; Jamilkowski, J.; Lee, R.C. & Oerter, B.
Object Type:
Article
System:
The UNT Digital Library
Gender and globalization through film: A Wiki course
Poster presented as part of the 2012 University Forum on Teaching & Learning at UNT. This poster discusses a learning activity with a Wiki course on gender and globalization through film. The course aims to help students understand how existing gender inequalities are challenged and furthered by processes of international development and globalization.
Date:
March 28, 2012
Creator:
Altiok, Özlem
Object Type:
Poster
System:
The UNT Digital Library
Design Construction and Test Results of a HTS Solenoid For Energy Recovery Linac
An innovative feature of the proposed Energy Recovery Linac (ERL) is the use of a solenoid made with High Temperature Superconductor (HTS) with the Superconducting RF cavity. The use of HTS allows solenoid to be placed in close proximity to the cavity and thus provides early focusing of the electron beam. In addition, cryogenic testing at {approx}77 K is simpler and cheaper than 4 K testing. This paper will present the design, construction and test results of this HTS solenoid. The HTS solenoid in the proposed ERL will be situated in the transition region between the superconducting cavity at {approx}4 K and the cryostat at the room temperature. Solenoid inside the cryogenic structure provides an early focusing and hence low emittance beam. The temperature in the transition region will be too high for a conventional low temperature superconductor and resistive heat load from copper coils will be too high on cryogenic system. HTS coils also allow much higher current density and significant reduction in size as compared to copper coils. Hence HTS solenoid provide a unique and technically superior solution. The use of a HTS solenoid with superconducting cavity offers a unique option as it can be placed in a …
Date:
March 28, 2011
Creator:
Anerella, M.; Ben-Zvi, Ilan; Kayran, D.; McIntyre, G.; Muratore, J.; Plate, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Gainesville Daily Register (Gainesville, Tex.), Vol. 127, No. 148, Ed. 1 Tuesday, March 28, 2017
Daily newspaper from Gainesville, Texas that includes local, state, and national news along with advertising.
Date:
March 28, 2017
Creator:
Armstrong, Mark J.
Object Type:
Newspaper
System:
The Portal to Texas History
Gainesville Daily Register (Gainesville, Tex.), Vol. 128, No. 148, Ed. 1 Wednesday, March 28, 2018
Daily newspaper from Gainesville, Texas that includes local, state, and national news along with advertising.
Date:
March 28, 2018
Creator:
Armstrong, Mark J.
Object Type:
Newspaper
System:
The Portal to Texas History
SPARC Landscape Analysis: The Changing Academic Publishing Industry – Implications for Academic Institutions
This report was commissioned in response to the growing trend of commercial acquisition of critical infrastructure in our institutions. It is intended to provide a comprehensive look at the current players in this arena, their strategies and potential actions, and the implications of these on the operations of our libraries and home institutions. It also outlines suggestions for an initial set of strategic responses for the community to evaluate in order to ensure it controls both this infrastructure and the data generated by/resident on it. This document is designed to provide higher education leaders with an analysis of the leading commercial players’ strategies in this domain, the implications of those strategies, and a preliminary set of possible broad-stroke strategies that higher education institutions might consider taking to secure outcomes consistent with their own values and goals.
Date:
March 28, 2019
Creator:
Aspesi, Claudio; Allen, Nicole; Crow, Raym; Daugherty, Shawn; Joseph, Heather; McArthur, Joseph et al.
Object Type:
Book
System:
The UNT Digital Library
Beam losses due to abrupt crab cavity failures in the LHC
A major concern for the implementation of crab crossing in a future High-Luminosity LHC (HL-LHC) is machine protection in an event of a fast crab-cavity failure. Certain types of abrupt crab-cavity amplitude and phase changes are simulated to characterize the effect of failures on the beam and the resulting particle-loss signatures. The time-dependent beam loss distributions around the ring and particle trajectories obtained from the simulations allow for a first assessment of the resulting beam impact on LHC collimators and on sensitive components around the ring. Results for the nominal LHC lattice is presented.
Date:
March 28, 2011
Creator:
Baer, T.; Barranco, J.; Calaga, R.; Tomas, R.; Wenninger, B.; Yee, B. et al.
Object Type:
Article
System:
The UNT Digital Library
Dark Matter Jets at the LHC
We argue that dark matter particles which have strong interactions with the Standard Model particles are not excluded by current astrophysical constraints. These dark matter particles have unique signatures at colliders; instead of missing energy, the dark matter particles produce jets. We propose a new search strategy for such strongly interacting particles by looking for a signal of two trackless jets. We show that suitable cuts can plausibly allow us to find these signals at the LHC even in early data.
Date:
March 28, 2012
Creator:
Bai, Yang & Rajaraman, Arvind
Object Type:
Article
System:
The UNT Digital Library
Newsletter of Texas State Representative Ernest Bailes: Volume 1, Issue 5, March 2017
Newsletter of Ernest Bailes for his constituents in district 18 discussing news, activities, and various updates related to work in the Texas legislature. It focuses on reforms in public school finance, an update on Constable Justin Johnston, the presentation of CSHB 1469, updates in teacher retirement and property taxes, and the house bill to decrease the fee for carrying a handgun.
Date:
March 28, 2017
Creator:
Bailes, Ernest James, IV
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Booster main magnet power supply, present operation and potential future upgrades
The Brookhaven Booster Main Magnet Power Supply (MMPS) is a 24 pulse thyristor control supply, rated at 5500 Amps, +/-2000 Volts, or 3000 Amps, +/-6000 Volts. The power supply is fed directly from the power utility and the peak magnet power is 18 MWatts. This peak power is seen directly at the incoming ac line. This power supply has been in operation for the last 18 years. This paper will describe the present topology and operation of the power supply, the feedback control system and the different modes of operation of the power supply. Since the power supply has been in operation for the last 18 years, upgrading this power supply is essential. A new power supply topology has been studied where energy is stored in capacitor banks. DC to DC converters are used to convert the dc voltage stored in the capacitor banks to pulsed DC voltage into the magnet load. This enables the average incoming power from the ac line to be constant while the peak magnet power is pulsed to +/- 18 MWatts. Simulations and waveforms of this power supply will be presented.
Date:
March 28, 2011
Creator:
Bajon, E.; Bannon, M.; Marneris, I.; Danowski, G.; Sandberg, J. & Savatteri, S.
Object Type:
Article
System:
The UNT Digital Library
Senior Recital: 2015-03-28 – Benji Baker, percussion
Access:
Use of this item is restricted to the UNT Community
A senior recital presented at the UNT College of Music Voertman Hall.
Date:
March 28, 2015
Creator:
Baker, Benji
Object Type:
Sound
System:
The UNT Digital Library
Senior Recital: 2015-03-28 – Benji Baker, percussion
Access:
Use of this item is restricted to the UNT Community
A recital presented at the UNT College of Music Voertman Hall in partial fulfillment of the Bachelor of Music (BM) in Performance degree.
Date:
March 28, 2015
Creator:
Baker, Benji
Object Type:
Video
System:
The UNT Digital Library
Intra-Beam Scattering, Impedance, and Instabilities in Ultimate Storage Rings
We have investigated collective effects in an ultimate storage ring, i.e. one with diffraction limited emittances in both planes, using PEP-X as an example. In an ultimate ring intra-beam scattering (IBS) sets the limit of current that can be stored. In PEP-X, a 4.5 GeV ring running round beams at 200 mA in 3300 bunches, IBS doubles the emittances to 11.5 pm at the design current. The Touschek lifetime is 11 hours. Impedance driven collective effects tend not to be important since the beam current is relatively low. We have investigated collective effects in PEP-X, an ultimate storage ring, i.e. one with diffraction limited emittances (at one angstrom wavelength) in both planes. In an ultimate ring intra-beam scattering (IBS) sets the limit of current that can be stored. In PEP-X, IBS doubles the emittances to 11.5 pm at the design current of 200 mA, assuming round beams. The Touschek lifetime is quite large in PEP-X, 11.6 hours, and - near the operating point - increases with decreasing emittance. It is, however, a very sensitive function of momentum acceptance. In an ultimate ring like PEP-X impedance driven collective effects tend not to be important since the beam current is relatively low. …
Date:
March 28, 2012
Creator:
Bane, Karl
Object Type:
Article
System:
The UNT Digital Library
Study of Single and Coupled-Bunch Instabilities for NSLS-II
We study single and coupled-bunch instabilities for the NSLS-II storage ring with a recently developed parallel tracking code. For accurate modelling of the coupled-bunch instability, we investigate improvements to current point-bunch models to take into account finite bunch-size effects. Accurate modelling of single and coupled-bunch instabilities is of crucial importance for the machine performance of light sources such as NSLS-II, that provide high current beams. The complexity of the model consists in the accurate calculation of the impedance of the various components of the ring that can excite single and multibunch instabilities via short and long range wakefields. Moreover, a full account of the coupling between transverse and longitudinal dynamics must be taken into account to study effects such as chromaticity and Landau cavity effects. A parallel algorithm for the study of single and coupled-bunch instabilities has been implemented in a particle tracking code. The theoretical framework for single bunch instabilities is the same used in the code TRANFT, while for coupled-bunch instabilities a self-consistent algorithm has been implemented to allow the study of finite bunch-size effects and multibunch effects in arbitrary filling modes. In this paper we present numerical studies of the microwave instability for NSLS-II and discuss the …
Date:
March 28, 2011
Creator:
Bassi, G. & Blednykh, A.
Object Type:
Article
System:
The UNT Digital Library
Comparison of 1D and 2D CSR Models with Application to the FERMI@ELETTRA Bunch Compressors
We compare our 2D mean field (Vlasov-Maxwell) treatment of coherent synchrotron radiation (CSR) effects with 1D approximations of the CSR force which are commonly implemented in CSR codes. In our model we track particles in 4D phase space and calculate 2D forces [1]. The major cost in our calculation is the computation of the 2D force. To speed up the computation and improve 1D models we also investigate approximations to our exact 2D force. As an application, we present numerical results for the Fermi{at}Elettra first bunch compressor with the configuration described in [1].
Date:
March 28, 2011
Creator:
Bassi, G.; Ellison, J. A. & Heinemann, K.
Object Type:
Article
System:
The UNT Digital Library
Methanol Synthesis over Cu/ZnO/Al2O3: The Active Site in Industrial Catalysis
Unlike homogeneous catalysts, heterogeneous catalysts that have been optimized through decades are typically so complex and hard to characterize that the nature of the catalytically active site is not known. This is one of the main stumbling blocks in developing rational catalyst design strategies in heterogeneous catalysis. We show here how to identify the crucial atomic structure motif for the industrial Cu/ZnO/Al{sub 2}O{sub 3} methanol synthesis catalyst. Using a combination of experimental evidence from bulk-, surface-sensitive and imaging methods collected on real high-performance catalytic systems in combination with DFT calculations. We show that the active site consists of Cu steps peppered with Zn atoms, all stabilized by a series of well defined bulk defects and surface species that need jointly to be present for the system to work.
Date:
March 28, 2012
Creator:
Behrens, Malte
Object Type:
Article
System:
The UNT Digital Library
Design and first cold test of BNL superconducting 112 MHz QWR for electron gun applications
Brookhaven National Laboratory and Niowave, Inc. have designed, fabricated, and performed the first cold test of a superconducting 112 MHz quarter-wave resonator (QWR) for electron gun experiments. The first cold test of the QWR cryomodule has been completed at Niowave. The paper discusses the cryomodule design, presents the cold test results, and outline plans to upgrade the cryomodule for future experiments. A quarter-wave resonator concept of superconducting RF (SRF) electron gun was proposed at BNL for electron cooling ion/proton beams at 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 plans for the cryomodule upgrade for future experiments.
Date:
March 28, 2011
Creator:
Belomestnykh, S.; Ben-Zvi, Ilan; Boulware, C. H.; Chang, X.; Grimm, T. L.; Siegel, B. et al.
Object Type:
Article
System:
The UNT Digital Library
Libya: Transition and U.S. Policy
This report discusses the revolution and current conflict in Libya. The current crisis was triggered in mid-February 2011 by a chain of events in Benghazi and other eastern cities that quickly spiraled out of Qadhafi's control. Although Libyan opposition groups had called for a so-called "day of rage" on February 17 to commemorate protests that had occurred five years earlier, localized violence erupted prior to the planned national protests. As of April 25, U.S. and coalition officials stated that coalition military operations had destroyed the ability of the Libyan military to control Libyan airspace and had reduced the capability of Libyan ground forces by roughly 30%-40%.
Date:
March 28, 2012
Creator:
Blanchard, Christopher M.
Object Type:
Report
System:
The UNT Digital Library
Loss Factor of Tapered Structures for Short Bunches
Using the electromagnetic simulation code ECHO, we have found a simple phenomenological formula that accurately describes the loss factor for short bunches traversing an axisymmetric tapered collimator. In this paper, we consider tapered collimators with rectangular cross-section and use the GdfidL code to calculate the loss factor dependence on the geometric parameters for short bunches. The results for both axisymmetric and rectangular collimators are discussed. The behaviour of the impedance of tapered structures for very short bunches in the optical regime has been determined in refs. [10,11]. Here, for the loss factors for two particular geometries, we have studied the departure from the optical regime behaviour as bunch length is increased. In both cases, the ratio of the loss factor for the tapered collimator to the loss factor in the optical regime is a function only of the scaling parameter {sigma}L/d{sup 2}. The fact that the bunch length a and the taper length L appear as a product is consistent with the recent scaling derived by Stupakov in ref. [12], since there is only a weak dependence on g. One noteworthy fact that is not a priori expected is that only the larger radius or vertical half-aperture d appears. The …
Date:
March 28, 2011
Creator:
Blednykh, A.
Object Type:
Article
System:
The UNT Digital Library
NSLS-II BPM System Protection from Rogue Mode Coupling
Rogue mode RF shielding has been successfully designed and implemented into the production multipole vacuum chambers. In order to avoid systematic errors in the NSLS-II BPM system we introduced frequency shift of HOM's by using RF metal shielding located in the antechamber slot of each multipole vacuum chamber. To satisfy the pumping requirement the face of the shielding has been perforated with roughly 50 percent transparency. It stays clear of synchrotron radiation in each chamber.
Date:
March 28, 2011
Creator:
Blednykh, A.; Bach, B.; Borrelli, A.; Ferreira, M.; Hseuh, H. C.; Hetzel, C. et al.
Object Type:
Article
System:
The UNT Digital Library