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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 37 records · Page 2
All sourcesNASA NTRSDOE OSTI
DOE OSTI2011

Operational Status and Life Extension Plans for the Los Alamos Neutron Science Center (LANSCE)

The Los Alamos Neutron Science Center (LANSCE) accelerator and beam delivery complex generates the proton beams that serve three neutron production sources, a proton radiography facility and a medical and research isotope production facility. The recent operating history of the facility, including both achievements and challenges, will be reviewed. Plans for performance improvement will be discussed, together with the underlying drivers for the ongoing LANSCE Linac Risk Mitigation (LRM) project. The details of this latter project will also be discussed.

Accelerator Design, Technology, and Operations↗
DOE OSTI2020

Technical Interface Coordination with SHINE (FY2020 Summary)

In FY20, Los Alamos National Laboratory (LANL) performed technical interface coordination with SHINE including coordination of SHINE CFD and thermal hydraulics conference calls, national laboratory conference calls, and program management activities such as reporting and tracking requirements for current FY20 activities. SHINE did not request any general technology consultation support for emergent issues. LANL has participated in the bi-weekly conference calls with SHINE and other national laboratories regarding LANL’s current activities. Activities discussed include the Supo 3-D CFD model geometry validation, releasing the CFD-MCNP coupled codes for the generic solution vessel simulations, and the ANL bubble experiment #2 design, preparation, and collaboration.

07 ISOTOPE AND RADIATION SOURCES↗
DOE OSTI2023

Resilient GaN-based Power Module with Improved Diagnostic for Future Accelerator

Los Alamos Neutron Science Center (LANSCE) and Dual-Axis Radiographic Hydrodynamic Test facility (DARHT) play a pivotal role in advancing scientific research and national security initiatives. As a premier facility for neutron science, LANSCE and DARHT provide invaluable insights into fundamental research, materials science, nuclear physics, high-energy physics, material science, and medical imaging. Existing (DC) power supply and pulse modulation technologies used in LANSCE and DARHT face limitations in terms of reliability, maintainability, and diagnostics which hinder the progress of these cutting-edge facilities. By proposing improvements to LANL accelerator facilities’ performance and addressing component failure, we aim to enhance scientific outcomes and minimize disruptions, allowing for more efficient and productive research activities while ensuring the continuity of valuable contributions to the user community. This proposal aims to revolutionize (DC) power supply and pulse power systems for future particle accelerators via the development of a resilient GaN-based power module with improved diagnostic and redundant submodules.

43 PARTICLE ACCELERATORS↗
DOE OSTI2024

Risk-based System Upgrade Planning for AOT-IC [Capstone Project]

The Accelerator Operations and Technology Instrumentation and Controls Group (AOT IC) at the Los Alamos Neutron Science Center (LANSCE) has established a comprehensive risk-based system upgrade planning strategy which has been utilized as a tool to prioritize system upgrade projects for the past several years. A challenge with the current system is that the group often lacks the data to quantify the probability and impact of system failures, so the group often relies instead on qualitative risk assessments as well as evaluations of a potential upgrade project’s alignment with group strategy and vision to prioritize projects. A proposed framework to enable quantitative risk probability and impact assessments has been developed and tested on three pilot systems chosen to broadly represent the types and conditions of equipment used by the group. The proposed framework incorporates availability data gathered from the LANSCE control room logbooks and the LANSCE work control system, as well as a system health evaluation which is conducted from a variety of resources to assess the probability of equipment failure. The impact of system failure is viewed from the perspective of impact on mission and schedule, where spares status, system documentation status, and the functional distribution of deployed systems are used to quantify these impacts.

43 PARTICLE ACCELERATORS↗
DOE OSTI2011

Harmonic Generation at Lower Electron Energies for a Hard X-ray FEL

There are several schemes currently being investigated to pre-bunch the electron beam and step the coherent bunching up to higher harmonics, all which require modulator sections which introduce additional energy modulation. X-ray FELs operate in a regime where the FEL parameter, {rho} is equal to or less than the effective energy spread introduced from the emittance in the electron beam. Because of this large effective energy spread, the energy modulation introduced from harmonic generation schemes would seriously degrade FEL performance. This problem can be mitigated by incorporating the harmonic generation scheme at a lower electron kinetic energy than the energy at the final undulator. This will help because the effective energy spread from emittance is reduced at lower energies, and can be further reduced by making the beam transversely large. Then the beam can be squeezed down slowly enough in the subsequent accelerator sections so that geometric debunching is mitigated. The beam size inside the dispersive chicanes and in the accelerator sections must be carefully optimized to avoid debunching, and each subharmonic modulator section must generate enough energy modulation to overcome the SASE noise without significantly increasing the gain length in the final undulator. Here we show analytical results that demonstrate the feasibility of this harmonic pre-bunching scheme.

Accelerator Design, Technology, and Operations↗
DOE OSTI2022

Results of the first implementation of RF phase signature matching at LANSCE

The LINAC at the Los Alamos Neutron Science Center (LANSCE) has been utilizing the Delta-t method to match the RF cavities to the design acceleration parameters since its commissioning in 1972. The differences in time-of-flight between two subsequent Beam Position and Phase Monitors (BPPMs) are measured with both accelerated and drifting beams, depending on the whether the module is set to on or off. The algorithm optimizes the module amplitude and phase via iterative measurements if the initial phase is in the vicinity of the design value. With an upgrade to a faster readout system, a scan over the whole RF cavity phase range requires relatively less time than the classical optimization procedure. The Phase Scan Signature Matching (PSSM) method provides a time-efficient method that ensures the phase selection lands on the bunching side and empowers future analyses to build module-specific models. The PSSM also utilizes a direct model to determine the correct amplitude to sub-percent level instead of using linearized matrices. Furthermore, lacking a reliable energy measurement method in the LINAC, we measure the beam phases at two downstream locations to increase the precision of energy measurements. In this letter, we also discuss the sensitivities of PSSM, error propagation, and the implementation results for the 2019 and 2020 beam cycles.

47 OTHER INSTRUMENTATION↗
DOE OSTI2011

Using an Emittance Exchanger as a Bunch Compressor

An Emittance EXchanger (EEX), like a chicane, can be used for bunch compression. However, it offers a unique characteristic: the R56 term in an EEX vanishes, which decouples the final longitudinal position from the particles' energies, thereby suppressing the microbunch instability and providing a great deal of flexibility in tailoring the final particle longitudinal phase space

Accelerator Design, Technology, and Operations↗
DOE OSTI2012

Solar Agile Delivery of Electrical Power Technology (Solar ADEPT) (2nd Quarterly) [Slides]

This talk is for the ARPA-E funded program that Los Alamos is part of a team with Carnegie Mellon University, Magnetics div. of Spang, and the University of Pittsburgh. Most of the material presented in this talk has been presented before and is associated with accelerators and has a 'DUSA' 'ATDO' designator. Slight variations in circuit topology as presented here are somewhat novel and although not classified should be considered Los Alamos proprietary. The viewgraphs from 'both' talks will be presented to team members and the ARPA-E sponsor.

14 SOLAR ENERGY↗
DOE OSTI2014

Suppressing Parasitic Effects in a Long Dielectric Wakefield Accelerator

Dielectric wakefield acceleration is a promising concept for increasing the accelerating gradient above the limits of conventional accelerators. Although superior gradients are reported in short dielectric wakefield accelerator tubes, problems arise when it comes to efficiency and multi-meter long interaction lengths. Here we discuss possible issues and provide some solutions backed by simulations.

43 PARTICLE ACCELERATORS↗
DOE OSTI2015

An Electron Beam Test Facility (EBTF) for TA-53

A dedicated facility for electron-beam R&D would significantly increase the viability of the Accelerator and Electrodynamics capability at LANL. Such a facility would provide access to a high-quality source of nearly-relativistic electrons, sufficient experimental and data acquisition capabilities, and flexibility to enable a broad range of fundamental and applied accelerator and beam physics experiments. Such a facility would cost-effectively meet the needs of a broad set of projects and sponsors ranging from LANL LDRD, DOE Office of Science, NNSA Global Security, Threat Reduction, and others. Implementation of such a facility at TA-53 would allow technical resources for Accelerator and Electrodynamics capability development to remain within LANL while meeting many important mission needs that can only be met through such a facility, allowing technical capability and technical expertise to co-reside.

43 PARTICLE ACCELERATORS↗
DOE OSTI2015

Zero Degree Line Mo Target Thermal Test Results and Analysis

Target testing at 35 and 42 MeV was completed on January 14, 2015. At 35 MeV the current was varied from 177 to 375 μA with helium mass flow rate varied from 45 up to 101 g/s. At 42 MeV only one current, 170 mA, was tested because of accelerator performance limitations. The target design for this test, and the subsequent production tests, is largely unchanged from the earlier design for ANL beam tests at lower energy and higher current, comprised of 25 Mo disks 1 mm thick spaced 0.5 mm apart for helium coolant flow gaps. Disks are 12 mm diameter, with expected beam size 6 mm FWHM. Because the target, particularly the window, was designed for lower energy and higher current, the intercepted beam (beam heating) was much less during these tests. Therefore, the thermal stress and, more importantly, reduction in material strength resulting from high temperature, was not a limiting concern. The intended result of the thermal test is to measure heat transfer as a function of helium mass flow rate. Heat transfer coefficient was determined by the measurement of temperature at the center of the first 8 Mo disks while varying helium flow rate and beam current. The performance was then compared to predictive tools: Heat transfer correlations in the literature and finite element analysis using ANSYS

42 ENGINEERING↗
DOE OSTI2015

Production Facility System Reliability Analysis Report

This document describes the reliability, maintainability, and availability (RMA) modeling of the Los Alamos National Laboratory (LANL) design for the Closed Loop Helium Cooling System (CLHCS) planned for the NorthStar accelerator-based 99 Mo production facility. The current analysis incorporates a conceptual helium recovery system, beam diagnostics, and prototype control system into the reliability analysis. The results from the 1000 hr blower test are addressed.

Accelerator Design, Technology, and Operations↗
DOE OSTI2017

Lujan Mark-4

This is a review of Mark-IV target neutronics design. It involved the major redesign of the upper tier, offering harder neutron spectra for upper-tier FPs; a redesign of the high-resolution (HR) moderator; and a preservation of the rest of Mark-III features.

43 PARTICLE ACCELERATORS↗