The Use of rf-Knockout for Determination of the Characteristics of the Transverse Coherent Instability of an Intense Beam

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The response of an intense beam of interacting particles to a deflecting rf-signal is computed theoretically and shown to be closely related to transverse coherent beam stability. It is shown that the beam response to sinusoidal excitation provides a direct measure of the stability of beam modes for given machine conditions (beam intensity, octupole current, sextupole current, momentum spread, etc.). This measurement includes the properties of the beam surroundings as well as the frequency spread effective for Landau damping. Since it is generally difficult to evaluate theoretically the wall and beam properties that enter into stability calculations, the information which … continued below

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21 p.

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Möhl, Dieter & Sessler, Andrew M. August 1971.

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The response of an intense beam of interacting particles to a deflecting rf-signal is computed theoretically and shown to be closely related to transverse coherent beam stability. It is shown that the beam response to sinusoidal excitation provides a direct measure of the stability of beam modes for given machine conditions (beam intensity, octupole current, sextupole current, momentum spread, etc.). This measurement includes the properties of the beam surroundings as well as the frequency spread effective for Landau damping. Since it is generally difficult to evaluate theoretically the wall and beam properties that enter into stability calculations, the information which can be obtained from rf excitation experiments should be very valuable; especially in devising practical procedures for reducing the severity of coherent transverse instabilities.

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21 p.

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Office of Scientific & Technical Information Technical Reports

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  • August 1971

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  • Sept. 27, 2016, 1:39 a.m.

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  • Jan. 17, 2020, 2:38 p.m.

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Möhl, Dieter & Sessler, Andrew M. The Use of rf-Knockout for Determination of the Characteristics of the Transverse Coherent Instability of an Intense Beam, report, August 1971; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc902871/: accessed June 2, 2023), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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