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Results for “BUNCHES”
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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Chirped Electron Bunch Energy Compensation for an X-Ray Light Source
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Mathematical Models of Feedback Systems for control of Intra-bunch Instabilities Driven by EClouds and TMCI
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End-to-end 9-D polarized bunch transport in eRHIC energy-recovery recirculator, some aspects
This paper is a brief overview of some of the numerous beam and spin dynamics investigations undertaken in the framework of the design of the FFAG based electron energy recovery re-circulator ring of the eRHIC electron-ion collider project
A bunch compression method for free electron lasers that avoids parasitic compressions
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Non-invasive Beam Monitor, Fast Kicker, Bunch Shaper, and Photogun
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Multi-Moded Multi-Frequency Fast Single Bunch Beam Diagnostic Instrument
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Integrated high efficiency bunch shaping techniques for SWFA Demonstrator
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11.424 Ghz Stripline Transversal Filter for Sub-Picosecond Bunch Timing Measurements
Measurement of time-of-arrival or instantaneous longitudinal position is a fundamental beam diagnostic. We present results from a stripline transversal periodic coupler structure which forms the heart of a sub-ps beam timing detector. This filter structure approximates a sinx/x response in the frequency domain which corresponds to a limited pulse length response in the time domain. These techniques have been used extensively in beam feedback systems at 3 GHz center frequencies with operational single-shot resolutions of 200 fs [1]. We present a new design, based on a 11.424 GHz center frequency, which is intended to offer a factor of four improvement in time resolution. Two-dimensional electromagnetic simulation results are shown, and the design optimization approach leading to the final circuit implementation is illustrated. The prototype circuit has been fabricated on 64mil Rogers 4003 and lab frequency domain and time domain data are compared to the 2-D simulation results. Performance of the prototype circuit is shown with applicability to sub-ps beam measurements in LINAC and FEL applications.
Ammonia Fiber Expansion (AFEX) Pretreatment, Enzymatic Hydrolysis, and Fermentation on Empty Palm Fruit Bunch Fiber (EPFBF) for Cellulosic Ethanol Production
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An online learning approach to eliminate Bus Bunching in real-time
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Bio-CH4 from palm empty fruit bunch via pyrolysis-direct methanation: Full plant model and experiments with bio-oil surrogate
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Beam transfer functions for relativistic proton bunches with beam–beam interaction
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Generation of two-color ultra-short radiation pulses from two electron bunches and a chirped seeded free-electron laser
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Emittance preservation during bunch compression with a magnetized beam
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A hybrid approach for generating ultra-short bunches for advanced accelerator applications
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Numerical simulations of early-stage dynamics of electron bunches emitted from plasmonic photocathodes
High-brightness electron sources are a key ingredient to the development of compact accelerator-based light sources. The electron sources are commonly based on (linear) photoemission process where a laser pulse with proper wavelength impinges on the surface of a metallic or semiconductor photocathode. Very recently, the use of plasmonic cathodes - cathodes with a nano-patterned surface - have demonstrated great enhancement in quantum efficiencies (Li et al., 2013 [1]). Alternatively, this type of photocathodes could support the formation of structured beams composed of transversely-separated beamlets. In this paper we discuss numerical simulations of the early-stage beam dynamics of the emission process from plasmonic cathodes carried out using the Warp (Friedman et al., 2014 [2]) framework. Furthermore, the model is used to investigate the properties of beams emitted from these photocathode and subsequently combined with particle-in-cell simulations to explore the imaging of cathode pattern after acceleration in a radiofrequency gun.