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Languages : en
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This memo considers placement of an ultra thin carbon foil into the SLC beam. Transition radiation light would be emitted from the surface of the foil. The optical spot from the foil could be viewed with a microscope objective lens and registered with an image detector. Multiple scattering for the foil thicknesses necessary will not affect the beam emittance. Calculations show that a thin carbon foil can withstand the electron beam if the electron beam is larger than 10 .mu.m in size. There are many possible radiation mechanisms from a foil - bremsstrahlung, black body temperature radiation, Cerenkov light, scintillation light, and transition radiation. Transition radiation is apparently dominant. It is proposed to use thin carbon foils, 75 to 150 A thick. Calculations indicate that 5 x 101° beam electrons will radiate a useable number of optical photons. Specifically with 150 A foils the fractional yield of useful optical photons is 10−3 photons per incident electron 5 x 10/sup +7/ optical photons imaged upon an image plane. Spread these photons over a 32 x 32 pixel CCD and one has the readout system of a monitor.
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Category : Power resources
Languages : en
Pages : 876
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Author: Optical Society of America
Publisher:
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Category : Optical instruments
Languages : en
Pages : 438
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Author:
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Category : Power resources
Languages : en
Pages : 672
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Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
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Languages : en
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A simple monitor has been built to measure the profile of the high power beam (800 kW) delivered by the CEBAF accelerator at Jefferson Lab. The monitor uses the optical part of the forward transition radiation emitted from a thin carbon foil. The small beam size to be measured, about 100[mu]m, is challenging not only for the power density involved but also for the resolution the instrument must achieve. An important part of the beam instrumentation community believes the radiation being emitted into a cone of characteristic angle 1/[gamma] is originated from a region of transverse dimension roughly[lambda][gamma]; thus the apparent size of the source of transition radiation would become very large for highly relativistic particles. This monitor measures 100[mu]m beam sizes that are much smaller than the 3.2 mm[lambda][gamma] limit; it confirms the statement of Rule and Fiorito that optical transition radiation can be used to image small beams at high energy. The present paper describes the instrument and its performance. The authors tested the foil in, up to 180[mu]A of CW beam without causing noticeable beam loss, even at 800 MeV, the lowest CEBAF energy.
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Category : Nuclear energy
Languages : en
Pages : 612
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Author: Alex H. Lumpkin
Publisher: A I P Press
ISBN:
Category : Science
Languages : en
Pages : 632
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Proceedings of the May 1996 workshop, including tutorial, invited, and contributed papers. Subjects include a subpicosecond bunch duration measurement technique based on autocorrelation of coherent transition radiation, commissioning results of the APS storage ring diagnostics systems, bunch instabi
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Category : Aeronautics
Languages : en
Pages : 602
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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: United States. National Aeronautics and Space Administration. Scientific and Technical Information Division
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Category : Aeronautics
Languages : en
Pages : 2088
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Author: United States. National Aeronautics and Space Administration. Scientific and Technical Information Division
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 2084
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