Higher Order Modes in Coupled Cavities of the Flash Module ACC39

We analyse the higher order modes (HOM's) in the 3.9GHz bunch shaping cavities installed in the FLASH facility at DESY. A suite of finite element computer codes (including HFSS and ACE3P) and globalised scattering matrix calculations (GSM) are used to investigate the modes in these cavities. This study is primarily focused on the dipole component of the multiband expansion of the wakefield, with the emphasis being on the development of a HOM-based BPM system for ACC39. Coupled inter-cavity modes are simulated together with a limited band of trapped modes.

Note:

Presented at the second International Particle Accelerator Conference (IPAC'11) in the Kursaal, San Sebastian, Spain from 4 to 9 September, 2011

cavity: superconductivity
RF system
higher-order
finite element
DESY FLASH
wake field
S-matrix
numerical calculations

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High precision superconducting cavity diagnostics with higher order mode measurements

et al.

- Phys.Rev.ST Accel.Beams 9 (2006) 112802
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DOI:
- 10.1103/PhysRevSTAB.9.112802