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Title Optimization of the Electron Emission From Carbon Nanotubes for Electron Cooling in ELENA
  • B. Galante, G. Tranquille
    CERN, Meyrin, Switzerland
  • J. Resta-López
    ICMUV, Paterna, Spain
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
Abstract Electron cooling is a process that guarantees beam quality in low energy antimatter facilities. In ELENA the electron cooler allows to reduce the emittance blow-up of the antiproton beam, thus delivering highly focused and bright beams at the unprecedented low energy of 100 keV to the experiments. In order to have a "cold" beam at such low energy, the electron gun of the cooler must emit a monoenergetic and relatively intense electron beam. Simulations have shown that efficient cooling can be achieved with a 5 mA electron beam having transverse energy spread of less than 100 meV and longitudinal energy spread of about 1 meV. A thermionic gun is currently used in operation, although it limits the performances due to a relatively high transverse energy of the emitted beam (>> 100 meV). Therefore, an optimization of the ELENA e-cooler gun is currently being studied, with the aim to develop and design a cold cathode e-gun based on carbon nanotubes acting as cold electron field emitters. The use of carbon nanotube arrays for electron emission implies the need of an extracting grid in order to allow a stable and uniform emission at relatively low electric fields. The grid and its features become then critical to control the electron beam properties. In this contribution we present a simulation study of the current extraction from a field emitting material involving different extracting grid types and how they affect the beam properties. Eventually, we propose a new gun layout.
Paper download P1010.PDF [0.232 MB / 4 pages]
Poster download P1010_POSTER.PDF [0.850 MB]
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Conference COOL2021
Series Workshop on Beam Cooling and Related Topics (13th)
Location Novosibirsk, Russia
Date 01-05 November 2021
Publisher JACoW Publishing, Geneva, Switzerland
Editorial Board Maxim Kuzin (BINP, Novosibirsk, Russia)
Online ISBN 978-3-95450-243-1
Online ISSN 2226-0374
Received 23 October 2021
Accepted 22 November 2021
Issue Date 10 December 2021
DOI doi:10.18429/JACoW-COOL2021-P1010
Pages 85-88
Creative Commons CC logoPublished by JACoW Publishing under the terms of the Creative Commons Attribution 3.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.