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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 271 records · Page 15
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

SRF Resonators for a bi-directional Energy Ramping Upgrade of the Isotope Production Facility Beamline at LANL

The LANL Isotope Production Facility (IPF) is one of the two high-current proton linear accelerators operated under the auspices of the DOE Office of Nuclear Physics Isotope Development and Production for Research Applications Program. The IPF beamline operates with a fixed 100-MeV energy proton beam, diverted from the LANSCE accelerator and guided towards the isotope production target station. The fixed beam energy limits the number of isotopes that can be produced at IPF, and adversely affects the purity of isotopes produced at non-optimal energies. In particular, the IPF program is receiving increasing numbers of requests for high purity isotopes such as Np-236 (national security applications) and Re-186 (medical therapy). These are typically produced via (p,n) and (p,2n) nuclear reactions, requiring very tight control of the incident energies on the production targets to ensure an end product with a high radionuclidic purity. It is well known that this level of energy control cannot be achieved when a 100 MeV beam of mono-energetic protons is degraded to the required energies, typically below 30 MeV, as too much energy spread is acquired. Operating the IPF beamline at lower, mono-energetic beam energies such as at 40 MeV will allow the required tight energy control in target assemblies to ensure a high purity product. In addition, NP has requested a LANL/BNL/ORNL collaboration focus on establishing a national large-scale production capability for the therapy isotope Ac-225. Recent nuclear cross section measurements done at LANL show that due to a steep rise in production cross section towards higher proton energies (See Figure 2), proton beams at energies substantially greater than 100 MeV will be highly beneficial for Ac-225 production [AC255]. Such higher-energy beams cannot be delivered to IPF at present. Lower-energy beams (70 MeV and 40 MeV) can be delivered but only in sole-use mode; all other LANSCE users must be offline during 70 MeV or 40 MeV operation.

07 ISOTOPE AND RADIATION SOURCES↗
DOE OSTI2020

SRF Fixture Design and HOM analysis

A particle accelerator can either be a normal conducting or a superconducting accelerator. While a superconducting accelerator is a more energy efficient option, they traditionally use a liquid helium bath to achieve the temperatures needed for superconductivity. This makes superconducting accelerators operationally complex and expensive. To make superconducting accelerators a more commercially viable option IARC is working on a cryogen free accelerator which can be seen below.

43 PARTICLE ACCELERATORS↗
DOE OSTI2020

The Effect of Process History on Grain Boundaries and Dislocation Substructures on Functional Properties of Nb for SRF Cavities: Plastic Formability and Microstructural Evolution. Final report

While much progress has been made in improving the performance of cavities in the past decade, reproducible performance remains elusive. This renewal of “The cost of grain boundaries on the performance of superconducting cavities” examines in further depth the interactions between forming and annealing processes and functional performance at the scale of dislocation substructure and grain boundaries. There are five tasks identified in the renewal, which are: Characterization / analysis of current cavity technology: Effect of deformation, heat treatment, surface treatments, and residual damage on cavity function (Lee and Bieler) Characterization of dislocation mechanisms in single and bicrystals (Bieler) Quantifying effects of impurities and deformation mechanisms in Nb using density functional theory calculations (Solanki) Crystal plasticity constitutive model development (Pourboghrat and Eisenlohr) Modeling and measuring thermal conductivity in thin layers (Wright)

36 MATERIALS SCIENCE↗
DOE OSTI2021

Computational Fluid Dynamic Simulation for Electrolyte Flow in Horizontal EP of Nb SRF Elliptical Cavities

An electrolyte flow velocity on an electropolishingsurface affects a material removal rate where higherremoval is observed with a higher velocity of theelectrolyte. In horizontal EP (HEP) of an ellipticalcavity, an electrolyte flow near the equator positionmight remain slow and responsible for a lowerremoval compared to that on the iris and beam pipepositions. In order to understand the flow dynamicon an elliptical cavity surface in the horizontal EPprocess, a computational fluid dynamic simulationwas conducted. This study was conducted on 1.3GHz cavity with different cathodes and acid flowrates. Final aim of the study is to improve the flowuniformity to attain uniform removal especially inmulticell cavities.

Chouhan, V.↗
DOE OSTI2021

A White Paper on Design and Fabrication of SRF Deflecting Cavities for Elletra-2

Synchrotron Trieste (ST) operates an X-ray light source Elettra and plans to upgrade it to a low-emittance high-brightness X-ray source Elettra-2.0 based on a multi-bend achromat lattice. There is also a significant interest among Elettra users to pursue time-resolved studies of matter choosing the appropriate X-ray pulse duration in the range from 20 picoseconds to a few picoseconds FWHM. Recently, X. Huang (SLAC) and A. Zholents (ANL) performed a study sponsored by ST and proposed modifications to the Elettra-2.0 design that will allow production of picosecond x-ray pulses on many beamlines. They showed that two radio frequency deflecting cavities with slightly different frequencies can be installed in the ring’s sector 8 and produce time-dependent orbit deflection to a few dedicated electron bunches without affecting other regular bunches. These special bunches produce X-ray pulses in which transverse position or angle, or both, are correlated with time. The short X-ray pulse is then obtained by using a narrow slit positioned downstream in the beamline. Many technical details of the proposed modification to Elettra-2.0 are discussed in the supplemental report. We present here the design of a multicell superconducting deflecting cavity for the purpose of the ST Short Pulse X-ray (SPX) project.

43 PARTICLE ACCELERATORS↗
DOE OSTI2022

SRF E - Beam Accelerator for Metal Additive Manufacturing [Patent]

A system and apparatus for electron beam melting comprises a superconducting radio frequency accelerator configured to produce an electron beam, a conduction cooling system configured to cool the superconducting radio frequency accelerator, and an electron beam melting system wherein the electron beam melts power in a build chamber of the electron beam melting apparatus.

43 PARTICLE ACCELERATORS↗