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XX International Linac Conference

THB20 (Poster)

Presenter: Pascal Balleyguier (CEA)
Status: Complete
FullText: ps.gz or pdf

Improvement in 3D computation of RF-losses in resonant cavities

Pascal Balleyguier (CEA Bruyeres-le-Chatel), Ulrich Becker (CST Darmstadt)

In 1997, a cold model of a so-called optimized proton accelerating structure was measured. It turned out that predictions of RF losses in the region of coupling slots had been dramatically under-estimated by the simulation codes [1]. Since that time, a study made on the IPHI RFQ pumping holes showed that the problem occurred when a surface current line runs along a sharp re-entrant corner. This suggested a new way to compute losses and lead to an improvement in the MAFIA post-processor. We tested this new tool on the Trispal cavity geometry: the Q-drop caused by coupling slots is now very close to experimental values.
[1] P.Balleyguier, 'Coupling Slots Measurements Against Simulation For Trispal Accelerating Cavities', Proc. Linac Conference, Chicago, 1998.

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