Studies Toward a Demonstration of Relativistic Electron Beam Energy Modulation by Interaction with Terahertz Radiation in Free Space PDF Download
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Author: David Holder
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
This thesis details the experimental studies leading to initial attempts to measure an interaction in free space between a short pulse of terahertz radiation (generated from a 40 fs, 800 nm titanium-sapphire (Ti:S) laser pulse) and bunches of medium-energy relativistic electrons within the ALICE accelerator. The work undertaken included optimization of the terahertz source itself, which is a large-area photoconductive antenna with high-voltage electrodes; the aim being to maximize the potential that can be applied before breakdown occurs. The key feature of such terahertz sources is the radially-polarized (TEM10-like) nature of the radiation generated. Further work included characterization of the temporal structure and transverse profile of the terahertz radiation pulse in the ALICE Diagnostics Room; duplication of this experimental arrangement inside the ALICE accelerator; modification of the operating parameters of ALICE to produce the most conductive situation for detecting an interaction. The final step was the installation of additional electron beam diagnostics and the experimental search for a definite interaction signal. The work described in this thesis is part of a project named ALICE Energy Modulation Induced by Terahertz Radiation, also known as AEMITR.
Author: David Holder
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
This thesis details the experimental studies leading to initial attempts to measure an interaction in free space between a short pulse of terahertz radiation (generated from a 40 fs, 800 nm titanium-sapphire (Ti:S) laser pulse) and bunches of medium-energy relativistic electrons within the ALICE accelerator. The work undertaken included optimization of the terahertz source itself, which is a large-area photoconductive antenna with high-voltage electrodes; the aim being to maximize the potential that can be applied before breakdown occurs. The key feature of such terahertz sources is the radially-polarized (TEM10-like) nature of the radiation generated. Further work included characterization of the temporal structure and transverse profile of the terahertz radiation pulse in the ALICE Diagnostics Room; duplication of this experimental arrangement inside the ALICE accelerator; modification of the operating parameters of ALICE to produce the most conductive situation for detecting an interaction. The final step was the installation of additional electron beam diagnostics and the experimental search for a definite interaction signal. The work described in this thesis is part of a project named ALICE Energy Modulation Induced by Terahertz Radiation, also known as AEMITR.
Author: Daniel Mittleman
Publisher: Springer
ISBN: 3540456015
Category : Science
Languages : en
Pages : 351
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Book Description
The purpose of this book is two-fold. First, the various different methods of accessing the THz range are discussed, with a view to convince the reader that there have been qualitative and significant improvements over older, more conventional techniques. The text makes it clear that these improvements enable practical "real-world" applications of THz technology, in a manner which would not have been possible before. Second, the demonstrations and feasibility tests described serve as compelling evidence of the utility of such devices. Due to the unique characteristics of THz radiation and its interaction with materials, these devices have substantial advantages over other competing technologies in a number of different areas.
Author: Matthew. J Cliffe
Publisher: Springer
ISBN: 3319486438
Category : Science
Languages : en
Pages : 159
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Book Description
This book elaborates on the acceleration of charged particles with ultrafast terahertz electromagnetic radiation. It paves the way for new, and improves many aspects of current, accelerator applications. These include providing shorter electron bunches for ultrafast time-resolved pump-probe spectroscopy, enabling complex longitudinal profiles to be imparted onto charged particle bunches and significantly improving the ability to synchronise an accelerator to an external laser. The author has developed new sources of terahertz radiation with attractive properties for accelerator-based applications. These include a radially biased large-area photoconductive antenna (PCA) that provided the largest longitudinally polarised terahertz electric field component ever measured from a PCA. This radially biased PCA was used in conjunction with an energy recovery linear accelerator for electron acceleration experiments at the Daresbury Laboratory. To achieve even higher longitudinally polarised terahertz electric field strengths, and to be able to temporally tune the terahertz radiation, the author investigated generation within non-linear optical crystals. He developed a novel generation scheme employing a matched pair of polarity inverted magnesium-oxide doped stoichiometric lithium niobate crystals, which made it possible to generate longitudinally polarised single-cycle terahertz radiation with an electric field amplitude an order of magnitude larger than existing sources.
Author: National Research Council
Publisher: National Academies Press
ISBN: 030908637X
Category : Science
Languages : en
Pages : 177
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Book Description
Recent scientific and technical advances have made it possible to create matter in the laboratory under conditions relevant to astrophysical systems such as supernovae and black holes. These advances will also benefit inertial confinement fusion research and the nation's nuclear weapon's program. The report describes the major research facilities on which such high energy density conditions can be achieved and lists a number of key scientific questions about high energy density physics that can be addressed by this research. Several recommendations are presented that would facilitate the development of a comprehensive strategy for realizing these research opportunities.
Author: Nikita Wells
Publisher:
ISBN:
Category : Electron beams
Languages : en
Pages : 100
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Book Description
Soviet research on the propagation of intense relativistic electron beams (IREB) through fairly high-pressure air (pressure range 0.1 to 760 Torr) since the early 1970s has included the study of the plasma channel created by the passage of the electron beam through air, the resistive hose instability and its effect on beam propagation, the effect of self-fields, current enhancement, gas expansion, return currents, inherent beam energy spread, and other factors. This report covers Soviet developments in IREB propagation through air where the beam is not focused by external magnetic fields. The information was obtained from Soviet open-source publications with emphasis given to the last ten years of beam propagation in the Soviet Union. The volume of papers published on this subject in recent years indicates a significant increase in Soviet research in this area.
Author: Nicholas Sigmund Sudar
Publisher:
ISBN:
Category :
Languages : en
Pages : 181
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Book Description
Strongly tapered undulator interactions serve to dramatically increase the efficiency of energy exchange between an electromagnetic field and a relativistic electron beam. By extending this energy exchange beyond the energy bandwidth of the untapered interaction, a significant fraction of the electron beam power can be converted into coherent radiation or vice versa. Configured as a radiator, these interactions offer the scientific community and industry with a potential source of high peak and average power coherent radiation. The inverse interaction serves as a unique advanced accelerator known as the Inverse Free Electron Laser (IFEL), capable of achieving acceleration gradients far exceeding current RF technology. In this dissertation, a theoretical framework is first provided, describing the dynamics of strongly tapered undulator interactions configured both as a radiator and accelerator. Here also the concept of modulator chicane pre-bunching is introduced as a means to greatly increase the efficiency by better matching the incoming longitudinal phase space to the phase space acceptance of the interaction. Experimentally, high energy extraction efficiency was first demonstrated at mid-IR wavelengths in the Nocibur experiment performed at the Brookhaven National Laboratory's Accelerator Test Facility (BNL ATF). Reversing the orientation of the 11 period Rubicon helical undulator, strongly tapered in both period and field, up to 30\% of a pre-bunched 65 MeV electron beam's energy was converted to coherent radiation. The interaction was driven by 200 GW of seed power from the ATF's high power $CO_2$ laser with a wavelength of 10.3 $\mu$m. With the Rubicon undulator in IFEL configuration, the Double Buncher experiment demonstrated the ability to inject up to 96\% of a 52 MeV electron beam's charge into the phase space acceptance of the interaction, making use of the cascaded modulator-chicane pre-bunching scheme. This experiment was also performed at BNL ATF, driven by 75 GW of 10.3 $\mu$m seed power. The experimental design, components, measurements, diagnostics and experimental methods pertaining to both experiments are discussed as well as the results from both experiments.
Author: Linda Habash Krause
Publisher:
ISBN:
Category :
Languages : en
Pages : 532
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Book Description
Author: Sidney Darwin Putnam
Publisher:
ISBN:
Category :
Languages : en
Pages : 504
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Book Description
Author: Danny Y. Wang
Publisher:
ISBN:
Category : Cherenkov radiation
Languages : en
Pages : 316
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Book Description
Author: Helmut Wiedemann
Publisher: Springer Science & Business Media
ISBN: 940100367X
Category : Science
Languages : en
Pages : 399
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Book Description
A comprehensive survey of recent theoretical and experimental progress in the area of electron-photon interaction and dense media. A state-of-the-art discussion of radiation production, with descriptions of new ideas and technologies that enhance the production of X-rays in the form of channelling, transition and parametric X-ray production. Progress in electron beam physics to produce sub-picosecond electron bunches from low-energy linear accelerators make it possible to produce coherent, high brightness, submillimeter radiation and sub-picosecond X-ray pulses. Micro-undulators in the form of bent crystalline structures hold great promise as future X-ray sources.
