Journal Article

PUBDB-2025-00415

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Active harmonic EU cavity: Commissioning and operation with beam

Perez, F. (Corresponding author) ; Alvarez, J. ; Bellafont, I. ; Bravo, B. ; Ocampo, J. ; Salom, A. ; Solans, P. ; Ebert b, M.DESY* ; Fröhlich, N.-O.DESY* ; Huelsmann, P.DESY* ; Onken, R.DESY* ; Anders, W. ; Duerr, V. ; Löwner, T. ; Matveenko, A. ; Ries, M. ; Shi, L. ; Tamashevich, Y. ; Tsakanian, A. ; De Gersem, H. ; Müller, W.

2024
Elsevier [Amsterdam]

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Please use a persistent id in citations: doi:10.1016/j.nima.2024.170195  doi:10.3204/PUBDB-2025-00415

Abstract: ALBA is a 3rd generation synchrotron light source located in Spain, in operation since 2012. In preparationfor its upgrade to a 4th generation facility, which requires addressing the significantly reduced Touscheklifetime, ALBA has designed and constructed a higher-order mode (HOM) damped active 3rd harmonic RFcavity. This cavity is designed to longitudinally lengthen the electron bunches, thereby reducing their densityand enhancing the beam lifetime. The design is based on the EU HOM-damped cavity currently employedin ALBA’s main radio frequency (RF) system. The cavity prototype was installed in the BESSY II ring undera collaborative agreement between ALBA, HZB, and DESY, institutions that operate at the same main RFfrequency, 500 MHz. This paper presents the first commissioning results, including bead-pull measurements,high-power conditioning and initial beam tests in both single and multi-bunch operation modes. The resultsconfirm that the cavity parameters are consistent with the design specifications, the HOMs are effectivelymitigated, and the anticipated beam lifetime enhancement is achieved, demonstrating the feasibility of thedesigned cavity.

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Contributing Institute(s):

1. Hochfrequenztechnik Radio Frequency Tech (MHF)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)

Experiment(s):

1. (PETRA IV)

Appears in the scientific report 2024

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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