Résumé du preprint DAPNIA-06-376
| DAPNIA-06-376 |
|---|
| Electronics and Algorithms for HOM Based Beam Diagnostics |
| J. Frisch, D. McCormick, J. May, S. Molloy, M. Ross, and T. Smith (SLAC), N. Baboi, O. Hensler, and L. Petrosyan (DESY), N. Eddy, and S. Nagaitsev (FNLA), O Napoly, R. Paparella, and C Simon (CEA), |
The signals from the Higher Order Mode (HOM) ports on superconducting cavities can be used as beam position monitors and to do survey structure alignment. A HOM-based diagnostic system has been installed to instrument both couplers on each of the 40 cryogenic accelerating structures in the DESY TTF2 Linac. The electronics uses a single stage down conversion form the 1.7 GHz HOM spectral line to a 20MHz IF which ahs been digitized. The electronics is based on low cost surface mount components suitable for large scale production. The analysis of the HOM data is based on Singular Value Decomposition. The response of the HOM modes is calibrated using conventional BPMs. |
