Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 59 for “"wakefield"”.
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The story of Wakefield -- a history of Wakefield, Massachusetts for third grade children
Thesis (Ed.M.)--Boston University
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Laser Wakefield Accelerator Simulations Using EPOCH
Laser wakefield accelerators (LWFA) provide a cheap, compact and accessible form of electron acceleration. These systems use high intensity laser pulses to drive a large amplitude plasma density wake. This wake is then used to trap and accelerate electrons to high energies. This particle …
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Metamaterial structures for Wakefield acceleration and high power microwave generation
… with electron beams for two applications: wakefield acceleration and high power microwave generation. Under the topic of wakefield acceleration, on the theoretical side, several metamaterial structures have been designed and simulated. The novel phenomenon of reversed Cherenkov radiation …
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Towards a free-electron laser driven by a laser wakefield accelerator
… and X-ray output. Driving an FEL with a laser wakefield accelerator (LWFA) electron beam would radically reduce the size of such systems as well as delivering ultra-short duration radiation pulses. In this thesis, the production and optimal transport of high-quality electron beams in an LWFA …
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Haumanu taiao ihumanea: collaborative study with Te Tai O Marokura Kaitiaki Group : Tuakana Miriama Kahu, Teina Benita Wakefield
… by Miriama Kahu and the Teina, Benita Wakefield working collaboratively with the Kaitiaki construct group formed to ensure that the use of indigenous knowledge and its transmission processes had honest transparency. The Tuakana was responsible for providing guidance, wisdom and …
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Course of studies in the language arts for the Willard B Atwell Junior High School in Wakefield, Massachusetts
Thesis (Ed.M.)--Boston University
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The Wakefield Phenomenon: A Rhetorical Examination of the Resurgence of the Anti-Vaccination Movement in the 20th & 21st Century
… the now redacted publication by the former Dr. Wakefield asserting a correlation between children receiving vaccinations and children exhibiting the onset of developmental disorders, with Autism Spectrum Disorder (ASD) garnering the most public attention. With increasing numbers of parents …
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Experimental study of photonic band gap accelerator structures
… from the cavity defect and beam position. Direct wakefield measurements were made in hot test using the bunch train produced by the MIT HRC 17 GHz linear accelerator. Measurements are compared with beam-loading theory, and wakefield simulations using ANALYST. Excellent agreement is observed …
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Torsion heating in complex plasma crystals.
… to plasma systems may occur, like the ion wakefield. The combination of microparticles in the plasma creates an ion wakefield that drives the formation of several static and dynamic structures in plasma crystals, most notably in this work, two spinning particles straddling a crystal …
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Laser-Produced Plasmas for Particle Acceleration
… accelerators. The technique is called laser wakefield acceleration, where electric fields of the order of 102 GV/m accelerate electrons to high energies (⇠102 MeV) over mm-distances in laser-produced plasmas. Among the prerequisites for this acceleration technique to produce electron beams …
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The Four Last Judgment Plays in The Corpus Christi Cycles
… Christi cycles, the Chester, York, the Towneley-Wakefield, and the Ludus Coventriae-Hegge, deal with The coming of Christ to judge mankind at the end of time. In this study of the four Last Judgment plays, I want to compare the four plays, to look at their Possible sources, and finally to …
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Laser-Driven Particle Acceleration - Improving Performance Through Smart Target Design
… protons in the overdense plasma regime and laser wakefield acceleration of electrons in the underdense regime. An experimental approach leads to novel acceleration concepts and investigations on properties of new target designs. In the overdense plasma regime, hollow microspheres were found to …
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Experimental investigation of the emission of high-brightness extreme ultraviolet radiation from laser-plasma interactions
The laser wakefield accelerator is a novel particle accelerator that takes advantage of the large electric fields generated by separating oppositely charged particles in plasma. The ponderomotive force of an intense, ultra-short duration, laser pulse drives density waves in under-dense plasma to …
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Experimental studies of the dynamics of neutral electron-positron beams
… laser system was used to produce laser-wakefield accelerated electron beams, that subsequently seeded a quantum electromagnetic cascade in a high-Z material to produce the necessary positron and quasi-neutral electron-positron beams. The development of hybrid accelerators that fuse the …
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High Power Microwave Generation for Advanced Particle Acceleration
… power extractor at the Argonne Wakefield Accelerator (AWA). We obtained up to 565 MW, 2.7 ns (FWHM) pulses at 11.7 GHz from the structure. The highest power was generated by a train of eight 65 MeV electron bunches spaced at 1.3 GHz with a total charge of 355 nC. The metamaterial …
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Selected Non-Indianist Works of Charles Sanford Skilton: The Witch's Daughter - A Cantata for Soprano and Baritone Soli, Chorus and Orchestra (1918) and Electra - Music of the Electra of Sophocles, Composed for Women's Chorus and Orchestra (1920)
… composers such as Arthur Farwell and Charles Wakefield Cadman. Skilton was known for more than just his Indianist works; his legacy as an American music pioneer is quite worthy of acknowledgement. This thesis examines Skilton's life, his compositions, public reception, and notable performances …
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Land Leveling Using Optimal Earthmoving Vehicle Routing
… Problem (SRCFP) developed by Henderson, Vaughan, Wakefield and Jacobson [2000]. The SRCFP is a discrete optimization search problem, proven to be NP-hard. The SRCFP describes the process of reshaping terrain through a series of cuts and fills. This process is commonly done when leveling land for …
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An exploration of agricultural education as an effective tool for developing students with special needs
… specific learning disabilities (Pense, Watson, & Wakefield, 2010). When one considers the ever-evolving rate that special education students are included in the secondary agriculture classroom, there is a continuing need to understand what these students are gaining from their experiences in the …
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High Energy Laser Driven Electron Acceleration
… carried out looking into the process of laser wakefield acceleration of electrons, for the possible application to the generation of multi-MeV γ-rays via nonlinear Thomson scattering. The effects of introducing a gas density gradient just after the accelerating gas cell was tested with the …
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