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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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Accelerator Science: Why RF?
Particle accelerators can fire beams of subatomic particles at near the speed of light. The accelerating force is generated using radio frequency technology and a whole lot of interesting features. In this video, Fermilab’s Dr. Don Lincoln explains how it all works.
RF Models for Plasma-Surface Interactions
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Fluid pipeline leak detection and location with miniature RF tags
Sensors locate troublesome leaks in pipes or conduits that carry a flowing medium. These sensors, through tailored physical and geometric properties, preferentially seek conduit leaks or breaches due to flow streaming. The sensors can be queried via transceivers outside the conduit or located and interrogated inside by submersible unmanned vehicle to identify and characterize the nature of a leak. The sensors can be functionalized with other capabilities for additional leak and pipeline characterization if needed. Sensors can be recovered from a conduit flow stream and reused for future leak detection activities.
Nano-Scale Optomechanical Devices and Phononic Crystals for RF Signal Processing.
Abstract not provided.
Rapid Systems Engineering of RF-Based IED Countermeasures.
Abstract not provided.
Gyrotron whispering gallery mode coupler with a mode conversion reflector for exciting a circular symmetric uniform phase RF beam in a corrugated waveguide
A cylindrical waveguide with a mode converter transforms a whispering gallery mode from a gyrotron cylindrical waveguide with a helical cut launch edge to a quasi-Gaussian beam suitable for conveyance through a corrugated waveguide. This quasi-Gaussian beam is radiated away from the waveguide using a spiral cut launch edge, which is in close proximity to a first mode converting reflector. The first mode converting reflector is coupled to a second mode converting reflector which provides an output free-space HE11 mode wave suitable for direct coupling into a corrugated waveguide. The radiated beam produced at the output of the second mode converting reflector is substantially circular.
High Precision RF Control For SRF Cavities In LCLS-II
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Laser-Free RF-Gun as a Powerful THz source
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An improved analytic model of electron back-bombardment in thermionic-cathode RF guns
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HIGH GRADIENT TESTING OF THE FIVE-CELL SUPERCONDUCTING RF MODULE WITH A PBG COUPLER CELL
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Nano-Scale Optomechanical Devices and Phononic Crystals for RF Signal Processing.
Abstract not provided.
High Power RF Testing of A 3-Cell Superconducting Traveling Wave Accelerating Structure
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RF design of normal conducting 704 MHz and 2.1 GHz cavities for LEReC Linac
N/A
Radio frequency plasma method for uniform surface processing of RF cavities and other three-dimensional structures
A method for efficient plasma etching of surfaces inside three-dimensional structures can include positioning an inner electrode within the chamber cavity; evacuating the chamber cavity; adding a first inert gas to the chamber cavity; regulating the pressure in the chamber; generating a plasma sheath along the inner wall of the chamber cavity; adjusting a positive D.C. bias on the inner electrode to establish an effective plasma sheath voltage; adding a first electronegative gas to the chamber cavity; optionally readjusting the positive D.C. bias on the inner electrode reestablish the effective plasma sheath voltage at the chamber cavity; etching the inner wall of the chamber cavity; and polishing the inner wall to a desired surface roughness.