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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 1,675 records · Page 93
All sourcesNASA NTRSDOE OSTI
DOE OSTI2013

Maximum Current of the NSLS-II Linac

The maximum current of the NSLS-II linac is an important operational parameter for determining the safety envelope of the acceleration. In this document we establish the maximum current of the NSLS-II linac. First we establish the maximum current that can be emitted by the gun and the parameters that limit this. Then we show that beam loading in the linac further limits the current available at the exit of the linac. Beam loading also determines the energy spectrum of the beam at the end of the linac. Once the maximum current at the exit of the linac is established, we transport this beam through the linac to booster transport line using the designed optics which will match the beam from the linac into the booster. This will determine the maximum current that can be delivered to the booster accelerator from the linac.

36 MATERIALS SCIENCE↗
DOE OSTI2014

NSLS-II 500 MHz Upstream Superconducting Cavity Commissioning

The NSLS-II Storage Ring RF system was designed to be equipped with up to four CESR-B type 500MHz niobium superconducting cavities. The first one has been installed and commissioned with beam at the upstream location of Cell 24 RF straight. Prior to tunnel installation, cryogenic and RF tests had been performed in the blockhouse to ensure that the cavity could provide enough energy gain for electron beam current of 25 mA for commissioning, and up to ~300 mA for early operation depending upon the total energy loss per turn at that time. After the blockhouse test, the cavity was installed in the storage ring tunnel, where it was then cooled down, conditioned, and finally commissioned with up to 50 mA of beam current. The NSLS-II LHe Cryogenic Plant was used to maintain the cavity temperature at 4.5K. The blockhouse interfaces with the cryogenic manifold box via a vacuum jacketed line, while in the tunnel the cryomodule is fed by a valvebox which is supplied by the same manifold box. The helium gas is recovered by the close-loop LHe system, and the nitrogen gas is vented outside of the RF building through a vent line. This report contains three parts describes cryogenic and RF tests in the blockhouse and cavity commissioning in the tunnel. Within the sections, the cryogenic operation is introduced first then the RF test is described. Section 5 describes further studies proposed for the next operation period.

36 MATERIALS SCIENCE↗
DOE OSTI2015

NSLS-II SR Commissioning Report

The NSLS-II storage ring (SR) phase I commissioning has been successfully completed in May 12, 2014. In accordance to the project milestone, 25 mA average current was achieved in the storage ring with PETRA III 500 MHz 7-cell PETRA-III RF cavity but w/o ID’s and Landau cavities. In about 5 weeks we delivered a 3 GeV beam to the ring injection straight section, made the 1st turn around the ring, achieved hundreds of turns optimizing injection, stored beam having sextupoles and RF turned ON. Injection efficiency was achieved 95%, close orbit rms value is ~100 um, tune and chromaticity were measured and adjusted as desired, and beam lifetime was a few hours depending on the stored beam current. This report consists of a summary, a chronological part, the injector system performance in Ch3, SR commissioning experience in Ch4 and the outlook of remaining work in Ch5. The SR commissioning experience includes the software experience, hardware (timing, diagnostics, RF, vacuum, PS) operation experience, the strategy for initial injection beam to the stored beam, measurement of the linear optics and control to the desired value, nonlinear beam dynamics study, beam instability study, the subsystem reliability and fault study at different scenarios.

36 MATERIALS SCIENCE↗
DOE OSTI2019

Cross-Border Energy Trade between Nepal and India: Assessment of Trading Opportunities

This study builds on several prior analyses of cross-border energy trading in South Asia to explore the potential trading opportunities between India, Nepal, and the larger South Asia region, including Bangladesh and Bhutan. It uses a detailed one-year, 1-hour resolution unit commitment and economic dispatch model of the South Asia power system to examine the technical and economic impacts of imports and exports under different assumptions about hydropower development in Nepal and regional trade agreements in the year 2022.

29 ENERGY PLANNING, POLICY, AND ECONOMY↗
DOE OSTI2017

CY2017 Second Quarter Asbestos Report

NNSS asbestos disposal report for Second Quarter of Calendar Year 2017 (date range: 04/01/2017 to 06/30/2017).

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE W↗
DOE OSTI2019

Science & Technology Review March 2019

At Lawrence Livermore National Laboratory, we focus on science and technology research to ensure our nation’s security. We also apply that expertise to solve other important national problems in energy, bioscience, and the environment. Science & Technology Review is published eight times a year to communicate, to a broad audience, the Laboratory’s scientific and technological accomplishments in fulfilling its primary missions. The publication’s goal is to help readers understand these accomplishments and appreciate their value to the individual citizen, the nation, and the world.

36 MATERIALS SCIENCE↗
DOE OSTI2019

Ten Principles for Power Sector Transformation in Emerging Economies

Access to reliable, affordable electricity is a key driver of economic growth in modern economies. The electric power sector, once a predictable and slow-moving industry, is now a complex system undergoing rapid transformation. Countries are in various stages of reforming and transforming their power sectors to better incorporate modern technologies, assure reliability and affordability, reduce harmful air emissions, meet a wide range of environmental goals, and achieve critical developmental objectives. This document offers action-oriented principles for emerging economy decision makers to consider while pursuing power system transformation (PST) pathways. They are organized into three categories: I. Foundations of Power System Transformation - important framework conditions for charting PST pathways; II. Accelerating Power System Transformation -- common strategies and approaches for accelerating PST efforts; and III. Moving Forward Inclusively with Power System Transformation -- considerations for fairness and equity in PST efforts.

24 POWER TRANSMISSION AND DISTRIBUTION↗
DOE OSTI2018

White Paper on Consequence Assessment of Transport of Hazardous Materials for PHMSA

This document describes a proposed methodology for assessing the consequences of accidents during transport of hazardous materials in the form of compressed gases as liquids in the United States. A quantitative population effect risk metric for a transport plan in terms of population numbers and effects is described. Quantitative results provide the Pipeline and Hazardous Materials Safety Administration (PHMSA) a means for evaluating routes, times, and other plans for material movement. Hazard releases are modeled with a consequence assessment tool maintained by the Defense Threat Reduction Agency (DTRA) that uses the Second-Order Closure Integrated Puff (SCIPUFF) atmospheric transport and dispersion model. LandScan TM 2016 USA Day and Night distributions are used for population data.

54 ENVIRONMENTAL SCIENCES↗
DOE OSTI2018

Longitudinal Beam Parameter Tolerance of NSLS-II

Similar to the transverse phase space, the beam parameters in the longitudinal phase space must also be monitored and controlled. In the longitudinal phase space the fundamental parameters are: bunch arrival time(or the corresponding RF phase), average momentum, bunch length, and momentum spread. These parameters are usually perturbed by the various noises in a real machine. The noises could excite longitudinal bunch motion, seen by the users as timing jitter, intensity and wavelength variation, and transverse position shift et al. The longitudinal oscillations also cause longitudinal emittance growth, therefore lengthen the bunch and increase the momentum spread, and eventually decrease the brightness. As a rule of thumb for the tolerances, either transverse or longitudinal, the perturbation caused by the noises should not result in a decrease of brightness by more than 10%.

36 MATERIALS SCIENCE↗
DOE OSTI2016

NSLS-II Linac Klystron Filament Failure Analysis

The NSLS-II linear accelerator uses the TH2100A klystron tube. One tube has failed with broken window with less than 8000 hours. The tuning (impedance matching) posts were clearly bent, indicating that this tube had a mismatch at the window that was tuned out at the factory. None of our other tubes arrived like this. It is not clear if this was a contributing factor to the failure. This tube was purchased by BNL and installed after linac commissioning to verify operation. Tube delivered with linac held as spare and re-installed when this tube failed.

42 ENGINEERING↗
DOE OSTI2018

Amazon Information Release on Seller TBI Corp (The Best Industries)

AC/DC Adapters model# JCY-1250 that were received with LED light strip kits have been electrically altered and reconfigured with wiring of a lesser grade that is not capable of carrying the anticipated amperage and voltage for the items use. The two items received from TBI Corp per the DOE definition are considered suspect/counterfeit.

42 ENGINEERING↗
DOE OSTI2018

Science & Technology Review December 2018

At Lawrence Livermore National Laboratory, we focus on science and technology research to ensure our nation’s security. We also apply that expertise to solve other important national problems in energy, bioscience, and the environment. Science & Technology Review is published eight times a year to communicate, to a broad audience, the Laboratory’s scientific and technological accomplishments in fulfilling its primary missions. The publication’s goal is to help readers understand these accomplishments and appreciate their value to the individual citizen, the nation, and the world.

29 ENERGY PLANNING, POLICY, AND ECONOMY↗
DOE OSTI2019

Benchmarking of Wellhead Safety Zone Criteria for Underground Gas Storage Facilities

Underground natural gas storage facilities are a vital part of the U. S. national infrastructure. However, the concept of hazard zones from fires and explosions at these facilities is not nearly as well defined as it is for natural gas transmission pipelines. This report will take a safety area predicted for underground gas storage facilities called the Wellhead Safety Zone or WSZ and benchmark it against the observed damage zone from the drill rig accident near Rama, Louisiana on November 15, 2007. When combined with earlier accidents, this new benchmark indicates the WSZ formula gives an accurate indication of the hazard radius from underground gas storage facility accidents over a wide range of casing sizes and pressures.

03 NATURAL GAS↗