Distribution of Heating from Untrapped HOM Radiation in the LCLS-II Cryomodules | Zendy

K. Bane | Zendy; C. Nantista | Zendy; C. Adolphsen | Zendy; T. Raubenheimer | Zendy; A. Saini | Zendy; N. Solyak | Zendy; Vyacheslav Yakovlev | Zendy

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Distribution of Heating from Untrapped HOM Radiation in the LCLS-II Cryomodules

Author(s) -

K. Bane,

C. Nantista,

C. Adolphsen,

T. Raubenheimer,

A. Saini,

N. Solyak,

Vyacheslav Yakovlev

Publication year - 2015

Publication title -

physics procedia

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.26

H-Index - 61

ISSN - 1875-3892

DOI - 10.1016/j.phpro.2015.11.057

Subject(s) - terahertz radiation , beam (structure) , physics , nuclear engineering , range (aeronautics) , power (physics) , radiation , materials science , ceramic , optics , optoelectronics , engineering physics , quantum mechanics , composite material , engineering

The superconducting cavities in the CW linacs of LCLS-II will operate at 2 K, where cooling is very expensive. One source of heat is presented by the higher order mode (HOM) power deposited by the beam. Due to the very short bunch length, especially in the L3 region, the LCLS-II beam spectrum extends into the terahertz range. Ceramic absorbers, at 70 K between cryomodules, are meant to absorb much of this power. In this report we perform two kinds of calculations to estimate the effectiveness of the absorbers and the fractional power that remains to be removed at 2 K

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