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| Report/Contribution to a conference proceedings | PUBDB-2016-02872 |
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1998
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Please use a persistent id in citations: doi:10.3204/PUBDB-2016-02872
Report No.: DESY-M-98-11G
Abstract: For the TESLA FEL operation very short intense bunches of electrons have to be accelerated. These bunches excite a broad spectrum of HOM (Higher Order Modes) up to frequencies of some THz. Two HOM couplers per cavity are foreseen in the present design proposal in order to extract some of the low frequency HOM from the superconducting accelerating structure. In this contribution an additional HOM broadband absorber is suggested which is to be installed between two cryogenic modules at a temperature of 70 K. Its task is to prevent that the really high frequency HOM are absorbed in the accelerator structure at the 2 K level. The absorption characteristics and the short range wake of four structures which make use of SiC as absorbing material are investigated using the MAFIA computer code. The proposed structures are easier to manufacture and better suited for the operation under vacuum conditions than the recently suggested waveguide array absorber.
Keyword(s): talk: Chicago 1998/08/23 ; electron positron: linear collider ; linear collider: proposed ; RF system: superconductivity ; free electron laser ; electromagnetic field: multipole ; microwaves: absorption ; silicon: carbon ; Maxwell equation ; numerical calculations
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