Limiting Effects in the Transverse-to-Longitudinal Emittance Exchange Technique for Low Energy Relativistic Electron Beams PDF Download
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Languages : en
Pages : 3
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Transverse to longitudinal phase space manipulation hold great promises, e.g., as a potential technique for repartitioning the emittances of a beam. A proof-of-principle experiment to demonstrate the exchange of a low longitudinal emittance with a larger transverse emittance is in preparation at the Argonne Wakefield Accelerator using a (almost equal to)12 MeV electron beam. In this paper we explore the limiting effects of this phase space manipulation method including high order and collective effects. A realistic start-to-end simulation of the planned proof-of-principle experiment including sensitivity studies is also presented.
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Languages : en
Pages : 3
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Book Description
Transverse to longitudinal phase space manipulation hold great promises, e.g., as a potential technique for repartitioning the emittances of a beam. A proof-of-principle experiment to demonstrate the exchange of a low longitudinal emittance with a larger transverse emittance is in preparation at the Argonne Wakefield Accelerator using a (almost equal to)12 MeV electron beam. In this paper we explore the limiting effects of this phase space manipulation method including high order and collective effects. A realistic start-to-end simulation of the planned proof-of-principle experiment including sensitivity studies is also presented.
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Languages : en
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Emittance exchange has been proposed to increase the performance of free electron lasers by tailoring the phase space of an electron beam. The principle of emittance exchange - where the transverse phase space of the electron beam is exchanged with the longitudinal phase space - has been demonstrated recently at the A0 photoinjector. The experiment used a low charge bunch (250 pC) with no energy chirp. Theory predicts an improvement in the emittance exchange scheme when the incoming beam has an energy chirp imparted on it. The energy chirp helps to overcome the thick lens effect of the deflecting mode cavity and other second order effects that might lead to an incomplete emittance exchange at higher charges. In this work, we report experimental and simulation results from operating the emittance exchange beam line using an energy chirped beam with higher charge (500 pC) at different RF-chirp settings.
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Languages : en
Pages : 5
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Author: R. P. Johnson
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Languages : en
Pages :
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The normalized longitudinal emittance of a muon beam after six-dimensional ionization cooling appears very small compared to the value that could be utilized or maintained after acceleration to muon collider energy. This circumstance offers the possibility for further reduction of the transverse emittance by introducing absorber-based reverse emittance exchange (REMEX) between longitudinal and transverse degrees of freedom before acceleration to high energy. REMEX follows Parametric-resonance Ionization Cooling and is accomplished in two stages. In the first stage the beam is stretched to fill the RF bucket at the initial cooling energy. In the second stage the beam is accelerated to about 2.5 GeV, where energy straggling begins to limit the absorber technique, and stretched again. The potential transverse emittance reduction and the intrinsic limitations of the REMEX technique have been analyzed earlier. In this report, we describe the required beam transport and RF parameters needed to achieve the maximum REMEX effect.
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Category : Power resources
Languages : en
Pages : 1364
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Category :
Languages : en
Pages : 6
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Over the recent years, the emergence of accelerator beamlines capable of exchanging the phase space coordinates between two degrees of freedom have opened the path toward the precise control of phase space distribution and in particular to the production of relativistic electron beams with shaped current profiles. After briefly reviewing the technique, we present its application to produce a train of sub-picosecond microbunches and report on its experimental implementation at the Fermilab's A0 photoinjector facility.
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Category :
Languages : en
Pages : 153
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Modern high-energy particle accelerators and synchrotron light sources demand smaller and smaller beam emittances in order to achieve higher luminosity or better brightness. For light particles such as electrons and positrons, radiation damping is a natural and effective way to obtain low emittance beams. However, the quantum aspect of radiation introduces random noise into the damped beams, yielding equilibrium emittances which depend upon the design of a specific machine. In this dissertation, the author attempts to make a complete analysis of the process of radiation damping and quantum excitation in various accelerator systems, such as bending magnets, focusing channels and laser fields. Because radiation is formed over a finite time and emitted in quanta of discrete energies, he invokes the quantum mechanical approach whenever the quasiclassical picture of radiation is insufficient. He shows that radiation damping in a focusing system is fundamentally different from that in a bending system. Quantum excitation to the transverse dimensions is absent in a straight, continuous focusing channel, and is exponentially suppressed in a focusing-dominated ring. Thus, the transverse normalized emittances in such systems can in principle be damped to the Compton wavelength of the electron, limited only by the Heisenberg uncertainty principle. In addition, he investigates methods of rapid damping such as radiative laser cooling. He proposes a laser-electron storage ring (LESR) where the electron beam in a compact storage ring repetitively interacts with an intense laser pulse stored in an optical resonator. The laser-electron interaction gives rise to rapid cooling of electron beams and can be used to overcome the space charge effects encountered in a medium energy circular machine. Applications to the designs of low emittance damping rings and compact x-ray sources are also explored.
Author: Linda Habash Krause
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Category :
Languages : en
Pages : 532
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Category : Physics
Languages : en
Pages : 914
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Author: Nicholas Sigmund Sudar
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Category :
Languages : en
Pages : 181
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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.
