Author: Yoon, Y.D.
Paper Title Page
TUPTB062 RF Measurements of the 3rd Harmonic Superconducting Cavity for a Bunch Lengthening 565
 
  • J.Y. Yoon, J.H. Han, H.S. Park, Y.D. Yoon
    Kiswire Advanced Technology Ltd., Daejeon, Republic of Korea
  • E. Kako
    KEK, Ibaraki, Japan
  • E.-S. Kim
    Korea University Sejong Campus, Sejong, Republic of Korea
  
  The bright­ness can be in­creased by min­i­miz­ing the emit­tance in the light source, but the re­duced emit­tance also in­creases the num­ber of col­li­sions of elec­trons in the beam bunch. There­fore, the bunch length­en­ing by using the 3rd har­monic cav­ity re­duces the col­li­sions of elec­trons and in­creases the Tou­schek life­time. Since the res­o­nant fre­quency of the main RF cav­ity is 500 MHz, the res­o­nant fre­quency of 3rd har­monic cav­ity is se­lected as 1500 MHz. The pro­to­type cav­ity is a pas­sive type in which a power cou­pler is not used, and power is sup­plied from the beam. The op­er­at­ing tem­per­a­ture is 4.5 K, which is a su­per­con­duct­ing cav­ity. The el­lip­ti­cal dou­ble-cell geom­e­try was se­lected to in­crease the ac­cel­er­at­ing volt­age of the cav­ity and re­duce power losses. Based on this de­sign, three nio­bium cav­i­ties are fab­ri­cated and tested. In this paper, we pre­sent the RF mea­sure­ment re­sults of the 3rd har­monic cav­ity at room tem­per­a­ture.
*3rd harmonic cavity
*4th generation storage ring 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2023-TUPTB062  
About • Received ※ 12 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 26 June 2023 — Issue date ※ 13 July 2023
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