• Open Access

Novel transverse emittance measurements for electron cooling characterization

J. R. Hunt, J. Resta-López, C. P. Welsch, C. Carli, B. Dupuy, and D. Gamba
Phys. Rev. Accel. Beams 23, 032802 – Published 3 March 2020

Abstract

The extra low energy antiproton ring (ELENA) finished commissioning before the start of CERN’s second long shutdown in December 2018, successfully providing beams to a new experimental zone. In 2021, ELENA will begin distributing cooled 100 keV antiproton beams to all antimatter experiments. To counteract beam blowup due to deceleration, ELENA will employ the use of an electron cooler. Measurements under similar circumstances, such as at the antiproton decelerator at CERN, have shown electron cooling causing non-Gaussian beam profiles. This effect, combined with nonzero dispersion at the location of the scraper in ELENA, presents new challenges in the use of ELENA’s scraper to determine the emittance during the deceleration cycle. Two new scraper algorithms have been developed and used to show the first evidence of significant electron cooling in ELENA, at 650 and 100 keV energy plateaus. The algorithms are capable of estimating the longitudinal momentum spread of the beams and accurately determining emittances for non-Gaussian beams in dispersive regions. Additionally, utilizing combinations of measurements from opposing scraper blades, additional information on the beam’s evolution is presented, suggesting a correlation between the emittance and longitudinal momentum offset of individual particles. Finally, considerations for further studies in ELENA and similar machines are presented.

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  • Received 10 November 2019
  • Accepted 20 February 2020

DOI:https://doi.org/10.1103/PhysRevAccelBeams.23.032802

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Accelerators & Beams

Authors & Affiliations

J. R. Hunt*, J. Resta-López, and C. P. Welsch

  • Department of Physics, University of Liverpool, L69 3BX, United Kingdom and The Cockcroft Institute, Daresbury, WA4 4AD, United Kingdom

C. Carli, B. Dupuy, and D. Gamba

  • CERN, CH-1211 Geneva-23, Switzerland

  • *james.hunt@cern.ch

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Vol. 23, Iss. 3 — March 2020

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