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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 865 records · Page 48
All sourcesNASA NTRSDOE OSTI
DOE OSTI2014

Performance and Fabrication Status of TREAT LEU Conversion Conceptual Design Concepts

Resumption of transient testing at the TREAT facility was approved in February 2014 to meet U.S. Department of Energy (DOE) objectives. The National Nuclear Security Administration’s Global Threat Reduction Initiative Convert Program is evaluating conversion of TREAT from its existing highly enriched uranium (HEU) core to a new core containing low enriched uranium (LEU). This paper describes briefly the initial pre-conceptual designs screening decisions with more detailed discussions on current feasibility, qualification and fabrication approaches. Feasible fabrication will be shown for a LEU fuel element assembly that can meet TREAT design, performance, and safety requirements. The statement of feasibility recognizes that further development, analysis, and testing must be completed to refine the conceptual design. Engineering challenges such as cladding oxidation, high temperature material properties, and fuel block fabrication along with neutronics performance, will be highlighted. Preliminary engineering and supply chain evaluation provided confidence that the conceptual designs can be achieved.

11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS↗
DOE OSTI2014

Fabrication and Measurements of 500 MHz Double Spoke Cavity

A 500 MHz β0=1 double spoke cavity has been designed and optimized for a high velocity application such as a compact electron accelerator at the Center for Accelerator Science at Old Dominion University [1] and the fabrication was recently completed at Jefferson Lab. The geometry specific to the double spoke cavity required a variety of tooling and fixtures. Also a number of asymmetric weld joints were expected to make it difficult to maintain minimal geometric deviation from the design. This paper will report the fabrication procedure, resulting tolerance from the design, initial test results and the lessons learned from the first β0=1 double spoke cavity fabrication.

Park, HyeKyoung↗
DOE OSTI2015

BNL 56 MHz HOM Damper Prototype Fabrication at JLab

A prototype Higher-Order Mode (HOM) Damper was fabricated at JLab for the Relativistic Heavy-Ion Collider's (RHIC) 56 MHz cavity at Brookhaven National Laboratory (BNL). Primarily constructed from high RRR Niobium and Sapphire, the coaxial damper presented significant challenges in electron-beam welding (EBW), brazing and machining via acid etching. The results of the prototype operation brought about changes in the damper design, due to overheating braze alloys and possible multi-pacting. Five production HOM dampers are currently being fabricated at JLab. This paper outlines the challenges faced in the fabrication process, and the solutions put in place.

36 MATERIALS SCIENCE↗
DOE OSTI2015

BNL 56 MHz HOM damper prototype fabrication at JLAB

A prototype Higher-Order Mode (HOM) Damper was fabricated at JLab for the Relativistic Heavy-Ion Collider’s (RHIC) 56 MHz cavity at Brookhaven National Laboratory (BNL). Primarily constructed from high RRR Niobium and Sapphire, the coaxial damper presented significant challenges in electron-beam welding (EBW), brazing and machining via acid etching. The results of the prototype operation brought about changes in the damper design, due to overheating braze alloys and possible multi-pacting. Five production HOM dampers are currently being fabricated at JLab. This paper outlines the challenges faced in the fabrication process, and the solutions put in place.

43 PARTICLE ACCELERATORS↗
DOE OSTI2017

Design, Fabrication, and Characterization of Graded Transition Joints

Dissimilar welds between austenitic and ferritic steels suffer from premature failure driven by interfacial stresses and material degradation, brought about by mismatch in the co-efficient of thermal expansion and carbon migration from ferritic steels to the interface, respectively. Tri-metallic transition joints using graded composition between ferritic and austenitic alloys are considered as a viable pathway to address this issue. However, hot cracking may occur during welding nickel alloys to stainless steel. This research attempts to reduce the hot cracking susceptibility of Inconel-82 alloys by functionally grading them with 316L. Optical and Electron microscopy showed extensive cracking in the graded regions. Calculations using Scheil-Gulliver techniques attributed the cracking to the expansion in the solidification range of Inconel-82. To circumvent solidification cracking another transition joint between SA 508 Gr 22 and SS-316L has been designed and fabricated with co-axial powder blown additive manufacturing using a SS 410-SS 316L grading. After fabrication, the joint was characterized using optical and scanning electron microscopy, wavelength dispersive spectroscopy, and electron back scattered and x-ray diffraction techniques. Characterization showed a successful transition joint with minor porosity. The measured composition gradients agree with the designed composition gradients. This study shows that 12-Cr steels could potentially be used to fabricate transition joints without any hot cracking.

42 ENGINEERING↗
DOE OSTI2018

Nanocrystal thin film fabrication methods and apparatus

Nanocrystal thin film devices and methods for fabricating nanocrystal thin film devices are disclosed. The nanocrystal thin films are diffused with a dopant such as Indium, Potassium, Tin, etc. to reduce surface states. The thin film devices may be exposed to air during a portion of the fabrication. This enables fabrication of nanocrystal-based devices using a wider range of techniques such as photolithography and photolithographic patterning in an air environment.

36 MATERIALS SCIENCE↗
DOE OSTI2018

Support for Fuel Fabrication and Characterization

Oak Ridge National Laboratory (ORNL) has participated in the Advanced Gas Reactor (AGR) program for the Next Generation Nuclear Plant (NGNP) and the transition to the Idaho National Laboratory (INL) Advanced Reactor Technologies (ART) Technology Development Office (TDO) since the inception of the program. In this effort, ORNL has fabricated tristructural isotropic (TRISO) fuel and fuel compacts for AGR-1, AGR-2, and AGR-3/4 experiments, provided matrix only components for AGC-2, AGC-4, and AGR 3/4 experiments and for university studies, and provided characterization, coating, and compaction support for INL and BWX Technologies Nuclear Operations Group (BWXT). In fiscal year (FY) 2017, the activities for the INL ART TDO fuel development are focused on preparations for the AGR-5/6/7 experiments and technical support to the Generation-IV International Forum (GIF) pre-irradiation leach-burn-leach (LBL) round robin effort with China and South Korea. With the successful transfer of fuel fabrication technology to BWXT, ORNL’s involvement has shifted toward transferring fuel characterization methods, providing technical support, verification of BWXT laboratory results, and fabricating surrogate fuel materials for university collaborations. ORNL will also provide analytical support to BWXT and INL for uranium dispersion analysis and confirmatory fuel characterization analyses as needed.

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DOE OSTI2018

Support for Fuel Fabrication and Characterization

Oak Ridge National Laboratory (ORNL) has participated in the Advanced Gas Reactor (AGR) program for the Next Generation Nuclear Plant (NGNP) and the transition to the Idaho National Laboratory (INL) Advanced Reactor Technologies (ART) Technology Development Office (TDO) since the inception of the program. In this effort, ORNL has fabricated tristructural isotropic (TRISO) fuel and fuel compacts for AGR-1, AGR-2, and AGR-3/4 experiments, provided matrix only components for AGC-2, AGC-4, and AGR 3/4 experiments and for university studies, and provided characterization, coating, and compaction support for INL and BWX Technologies Nuclear Operations Group (BWXT). In fiscal year (FY) 2017, the activities for the INL ART TDO fuel development are focused on preparations for the AGR-5/6/7 experiments and technical support to the Generation IV (GenIV) pre-irradiation leach-burn-leach round robin effort with China and South Korea. With the successful transfer of fuel fabrication technology to BWXT, ORNL’s involvement has shifted toward transferring fuel characterization methods, providing technical support, verification of BWXT laboratory results, and fabricating surrogate fuel materials for university collaborations. ORNL will also provide analytical support to BWXT and INL for uranium dispersion analysis and confirmatory fuel characterization analyses as needed.

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DOE OSTI2017

Support for INL ART TDO Advanced Gas Reactor Fuel Fabrication and Characterization

Oak Ridge National Laboratory (ORNL) has participated in the Advanced Gas Reactor (AGR) program for the Next Generation Nuclear Plant (NGNP) since the inception of the program. In this effort, ORNL has fabricated tri-structural isotropic (TRISO) fuel and fuel compacts for AGR-1, AGR-2, and AGR-3/4 experiments, provided matrix only components for AGC-2 and AGR-3/4 experiments and for university studies, and provided characterization, coating, and compaction support for Babcock and Wilcox (B&W). In FY 2017, the activities for the Very-High Temperature Reactor (VHTR) Technology Development Office (TDO) fuel development are focused on preparations for the AGR-5/6/7 experiments. With the successful transfer of fuel fabrication technology to B&W, ORNL’s involvement has shifted toward transferring fuel characterization methods, providing support for fabricating surrogate fuel materials international collaborations. ORNL will also provide analytical support to B&W for uranium dispersion analysis and confirmatory fuel characterization analyses as needed.

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DOE OSTI2019

Printed Conductive Transparent Films for the Fabrication of Sensors by Aerosol Inkjet Systems

Fabrication of sensors using additive manufacturing printers holds the promise for low-cost sensors for continuous and real time monitoring of physical and chemical parameters in industrial settings. Aerosol inkjet systems have demonstrated the capability to print small feature sizes with high precision using a variety of materials. Here, advances in nanomaterials suitable for use by such printers raises the possibility of having transparent, conductive films and sensors. Typically, transparent conductive films are fabricated using metallic oxides and complicated procedures on rigid substrates. In this paper, we present the results of the combination of silver nanowires formulations and aerosol inkjet systems for the fabrication of transparent conductive films by printing and its characterization. Implications for utilization of conductive, transparent sensors in manufacturing and industrial processes settings are discussed.

42 ENGINEERING↗
DOE OSTI2019

Printed Conductive Transparent Films for the Fabrication of Sensors by Aerosol Inkjet Systems

Fabrication of sensors using additive manufacturing printers holds the promise for low-cost sensors for continuous and real time monitoring of physical and chemical parameters in industrial settings. Aerosol inkjet systems have demonstrated the capability to print small feature sizes with high precision using a variety of materials. Advances in nanomaterials suitable for use by such printers raises the possibility of having transparent, conductive films and sensors. Typically, transparent conductive films are fabricated using metallic oxides and complicated procedures on rigid substrates. In this paper, we present the results of the combination of silver nanowires formulations and aerosol inkjet systems for the fabrication of transparent conductive films by printing and its characterization. Further, implications for utilization of conductive, transparent sensors in manufacturing and industrial processes settings are discussed.

42 ENGINEERING↗
DOE OSTI2015

BNL 56 MHz HOM DAMPER FABRICATION AT JLAB

The Higher-Order Mode (HOM) Dampers for the Relativistic Heavy-Ion Collider’s (RHIC) 56 MHz cavity at Brookhaven National Laboratory (BNL) are currently being fabricated at JLab. The coaxial damper is primarily constructed with high RRR niobium, with a combination of niobium and sapphire rings as the filter assembly. Several design changes have been made with respect to the performance of a prototype damper – also fabricated at JLab – which was found to quench at low power. The production dampers are being tuned and tested in the JLab vertical test area (VTA) prior to delivery. Two HOM dampers will be delivered to BNL; they are to be used in the RHIC in November, 2015. This paper outlines the challenges faced in the fabrication and tuning process.

Huque, Naeem A.↗
DOE OSTI2019

Oxidation Behavior of Ni-Based Alloys Fabricated by Additive Manufacturing

Additive manufacturing (AM) allows for the fabrication of complex near net shape components, leading to new design opportunities and significant savings, for example by decreasing tooling and materials cost or by accelerating prototype development. New Ni-based alloy heat exchangers with thin-walled areas exposed to hot gases will, however, suffer from corrosion degradation, and the high temperature oxidation performance of AM alloys needs to be addressed. Alloy N06002 (Ni-22Cr-18Fe-9Mo) fabricated by electron beam melting (EBM) and selective laser melting (SLM) along with EBM-fabricated N07247 and modified N07247 were cyclic oxidation tested at 950°C in air and humid air for durations ranging from 100 h to 5000 h. Increased spallation rates were observed initially for the AM N06002 alloys in comparison with wrought N06002 alloy because of the AM alloy specific microstructures. After ~2000 h, the situation was reversed with significant spallation observed for the wrought HX alloy only. Low mass gains were observed for the EBM N07247 alloys at 950°C, but thick oxide scales were observed locally due to the presence of oxidized cracks. Massive oxidation of these cracks led to fast oxidation rates at 1100°C.

Dryepondt, Sebastien N.↗
DOE OSTI2021

Method of fabricating photosensitive devices with reduced process-temperature budget

A method is provided for fabricating a backside-illuminated photodetector in which a device wafer is joined to a readout wafer in an IC hybridization step. Before the IC hybridization step, the device layer is defined in the device wafer, and an LPCVD layer is formed over the device layer. The LPCVD layer may be a passivation layer, an antireflection coating, or both. The side of the device wafer having the LPCVD layer is bonded to a handle wafer, the IC is hybridized by mating the device wafer to the readout wafer, and the handle wafer is then removed, exposing the LPCVD layer. Because the LPCVD layer is formed before the active devices are fabricated, it can be made by high-temperature techniques for deposition and processing. Accordingly, a layer of high quality can be fabricated without any hazard to the active devices.

Kay, Randolph R.↗
DOE OSTI2021

Synthesis of N-type thermoelectric materials, including Mg--Sn--Ge materials, and methods for fabrication thereof

Discussed herein are systems and methods for fabrication of MgSnGe-based thermoelectric materials for applications from room temperature and near room temperature to high temperature applications. The TE materials may be fabricated by hand or ball milling a powder to a predetermined particle size and hot-pressing the milled powder to form a thermoelectric component with desired properties including a figure of merit (ZT) over a temperature range. The TE materials fabricated may be disposed in thermoelectric devices for varying applications.

Ren, Zhifeng↗
DOE OSTI2022

Fabrication and installation of the Mu2e cryogenic distribution system

The muon-to-electron conversion (Mu2e) experiment at Fermilab will be used to search for the charged lepton flavor-violating conversion of muons to electrons in the field of an atomic nucleus. The Mu2e experiment is currently in the construction stage. The scope of this paper is the cryogenic distribution system and superconducting power leads for four superconducting solenoid magnets: Production Solenoid (PS), an Upstream and Downstream Transport Solenoids (TSu and TSd) and Detector Solenoid (DS). The design of the cryogenic distribution system and the fabrication of several sub-systems was reported previously. This paper reports on additional fabrication and installation progress that has been performed over the past two years. Lessons learned during fabrication and testing of the cryogenic distribution system components are described. In particular, the challenges and solutions implemented for aluminum welding are reported. A description of the process used to qualify the welding procedure and welders for welding the aluminium stabilized NbTi superconducting power leads is provided. Additionally, the progress made with regards to installing the power leads into the cryogenic Feedboxes is covered.

White, Michael J.↗
DOE OSTI2023

Apparatus and methods for managing packet transfer across a memory fabric physical layer interface

An apparatus and method for managing packet transfer between a memory fabric having a physical layer interface higher data rate than a data rate of a physical layer interface of another device, receives incoming packets from the memory fabric physical layer interface wherein at least some of the packets include different instruction types. The apparatus and method determine a packet type of the incoming packet received from the memory fabric physical layer interface and when the determined incoming packet type is of a type containing an atomic request, the method and apparatus prioritizes transfer of the incoming packet with the atomic request over other packet types of incoming packets, to memory access logic that accesses local memory within an apparatus.

Blagodurov, Sergey↗
DOE OSTI2023

Configuration of an optical switch fabric using machine learning

An optical switch fabric comprises two or more optical switch elements. The optical switch elements are configured in a topology. A switch control has a plurality of bias control signals. The switch control can address one or more of the optical switch elements and can apply one of the bias control signals to bias of the addressed optical switch element to establish a switch setting. The topology and switch settings determine how each of one of the inputs is connected to each of one of the outputs of the optical switch fabric. The switch settings are determined by a machine learning process which includes a model creation. The model can be made to adapt dynamically during optical switch fabric operation.

Dupuis, Nicolas↗