Abstract
Higher Order Modes (HOM) excited by the beam in the 3.9 GHz accelerating cavities in FLASH can be used for beam position diagnostics, as in a cavity beam position monitor. Previous studies of the modal choices within the complicated spectrum have revealed several options: cavity modes with strong coupling to the beam, and therefore with the potential for better position resolution, but which are propagating within all 4 cavities, and modes localized in the cavities or the beam pipes, which can give localized position information, but which provide worse resolution. For a better characterization of these options, a set of test electronics has been built, which can down-convert various frequencies between about 4 and 9 GHz to 70 MHz. The performance of various 20 MHz bands has been estimated. The best resolution of 20 micron was found for some propagating modes. Based on this study one band at ca. 5 GHz was chosen for high resolution position monitoring and a band at ca. 9 GHz for localized monitoring.
| Original language | English |
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| Title of host publication | Proceedings of IBIC2012 |
| Publisher | JACoW |
| Publication status | Published - 2012 |
| Event | International Beam Instrumentation Conference (IBIC2012) - Tsukuba, Japan Duration: 1 Oct 2012 → 4 Oct 2012 |
Conference
| Conference | International Beam Instrumentation Conference (IBIC2012) |
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| City | Tsukuba, Japan |
| Period | 1/10/12 → 4/10/12 |