Abstract
Higher order modes excited by the beam in an accelerating cavity contain transverse beam position information. We plan to make use of the dipole modes induced in the third harmonic 3.9GHz cavities at FLASH for beam alignment and measurement of transverse beam position. Due to the dense spectrum of modes and the couplings among cavities, it is considerably more challenging for the realization of the principle previously proved in TESLA 1.3GHz cavities. A specially designed test electronics based on down-converting principle is used to study various modal options for position diagnostics pinned down by previous studies. Present experiments suggest a resolution of 50 micron accuracy in predicting local beam position in the cavity and a global resolution of 20 micron over the complete module.
| Original language | English |
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| Publication status | Published - 26 Jun 2012 |
| Event | International Workshop on Higher-Order-Mode Diagnostics and Suppression in Superconducting Cavities (HOMSC12) - Cockcroft Institute, Daresbury, UK Duration: 25 Jun 2012 → 27 Jun 2012 |
Conference
| Conference | International Workshop on Higher-Order-Mode Diagnostics and Suppression in Superconducting Cavities (HOMSC12) |
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| City | Cockcroft Institute, Daresbury, UK |
| Period | 25/06/12 → 27/06/12 |