| EuCARD Conference Paper | |
| Report number | EuCARD-CON-2011-065 |
| Date(s), location | |
| Imprint | 2011 |
| Title | Higher Order Modes for Beam Diagnostics in Third Harmonic 3.9 GHz Accelerating Modules |
| Author(s) | Baboi, N (DESY) ; Eddy, E (FNAL) ; Flisgen, T (Universität Rostock) ; Glock, H-W (Universität Rostock) ; Jones, R M (The Cockcroft Institute / The University of Manchester) ; Shinton, I R R (The Cockcroft Institute / The University of Manchester) ; Zhang, P (The University of Manchester / DESY / The Cockcroft Institute) |
| WP | 10: SC RF technology for higher intensity proton accelerators and higher energy electron linacs |
| Task | 10.5: HOM Distribution |
| Abstract | An international team is currently investigating the best way to use Higher Order Modes (HOM) for beam diagnostics in 3.9 GHz cavities. HOMs are excited by charged particles when passing through an accelerating structure. Third harmonic cavities working at 3.9 GHz have been installed in FLASH to linearize the bunch energy profile. A proof-of-principle of using HOMs for beam monitoring has been made at FLASH in the TESLA 1.3 GHz cavities. Since the wakefields generated in the 3.9 GHz cavities are significantly larger, their impact on the beam should be carefully minimized. Therefore our target is to monitor HOMs and minimize them by aligning the beam on the cavity axis. The difficulty is that, in comparison to the 1.3 GHz cavities, the HOM-spectrum is dense, making it difficult to identify individual modes. Also, most modes propagate through the whole cryomodule containing several cavities, making it difficult to measure local beam properties. In this paper the options for the HOM-based beam position monitors are discussed. |
| Presented at | 15th International Conference on RF Superconductivity, Chicago, Illinois, USA, 25 - 29 Jul 2011 |
Email contact: [email protected]
Rekord stworzony 2012-06-11, ostatnia modyfikacja 2018-01-26
