Author: Dutine, M.
Paper Title Page
MOPMB008 In-Situ Quality Factor Measurements of SRF Cavities at S-DALINAC 70
SUSPB004   use link to see paper's listing under its alternate paper code  
 
  • R. Grewe, M. Arnold, A. Brauch, M. Dutine, L.E. Jürgensen, N. Pietralla, F. Schließmann, D. Schneider
    TU Darmstadt, Darmstadt, Germany
 
  Funding: Work supported by DFG (GRK 2128) and the State of Hesse within the Research Cluster ELEMENTS (Project ID 500/10.006)
The Su­per­con­duct­ing Darm­stadt Lin­ear Ac­cel­er­a­tor (S-DALINAC) is a thrice re­cir­cu­lat­ing elec­tron ac­cel­er­a­tor wich can be op­er­ated in a multi-turn en­ergy re­cov­ery mode*. The de­sign pa­ra­me­ters for ki­netic en­ergy and beam cur­rent are up to 130 MeV and up to 20 uA re­spec­tively. The in­jec­tor con­sists of a six-cell cap­ture cav­ity and two 20-cell srf cav­i­ties. The main linac con­sists of eight 20-cell cav­i­ties. The cav­i­ties are op­er­ated at a tem­per­a­ture of 2 K with a fre­quency of 2.9972(1) GHz. Mon­i­tor­ing of the srf cav­i­ties is im­por­tant for the over­all per­for­mance of the ac­cel­er­a­tor. A key pa­ra­me­ter for the rat­ing of the srf cav­ity per­for­mance is the in­trin­sic qual­ity fac­tor Q. At the S-DALINAC it is mea­sured for se­lected cav­i­ties dur­ing the yearly main­te­nance pro­ce­dures. The unique de­sign of the rf input cou­pler al­lows for a wide tun­ing range for the input cou­pling strength. This makes in-situ qual­ity fac­tor mea­sure­ments using the decay time mea­sure­ment method** pos­si­ble. The con­tri­bu­tion il­lus­trates the prin­ci­pal de­sign of the input cou­plers and the ben­e­fits it yields for Q mea­sure­ments. Re­cent re­sults in­clud­ing the pro­gres­sion of the qual­ity fac­tors over time will be pre­sented.
*Felix Schliessmann et al., Nat. Phys. 19, 597-602 (2023).
**Tom Powers, Proc. of SRF’05, Cornell University, Ithaca, New York, USA, 2005, p.40.
 
DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2023-MOPMB008  
About • Received ※ 19 June 2023 — Revised ※ 22 June 2023 — Accepted ※ 28 June 2023 — Issue date ※ 04 August 2023
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