| Preprint | |
| Report number | CERN-BE-2009-034 |
| Title | Orthogonal Coupling in Cavity BPM with Slots |
| Author(s) | Lipka, D (DESY) ; Nölle, D (DESY) ; Siemens, M (DESY) ; Vilcins, S (DESY) ; Caspers, Friedhelm (CERN) ; Stadler, M (PSI, Villigen) ; Treyer, DM (PSI, Villigen) ; Maesaka, H (JAERI-RIKEN, Hyogo) ; Shintake, T (JAERI-RIKEN, Hyogo) |
| Publication | 2009 |
| Imprint | 25 May 2009 |
| Number of pages | 4 |
| Presented at | Beam Diagnostics and Instrumentation for Particle Accelerators, Basel, Switzerland, 25 - 27 May 2009 |
| Subject category | Accelerators and Storage Rings |
| Keywords | Cavity-BPM ; DESY ; XFEL ; LINAC |
| Abstract | XFELs require high precision orbit control in their long undulator sections. Due to the pulsed operation of drive linacs the high precision has to be reached by single bunch measurements. So far only cavity BPMs achieve the required performance and will be used at the European XFEL, one between each of the up to 116 undulators. Coupling between the orthogonal planes limits the performance of beam position measurements. A first prototype build at DESY shows a coupling between orthogonal planes of about -20 dB, but the requirement is lower than -40 dB (1%). The next generation cavity BPM was build with tighter tolerances and mechanical changes, the orthogonal coupling is measured to be lower than -43 dB. This report discusses the various observations, measurements and improvements which were done. |
| Submitted by | [email protected] |
Journalen skapades 2009-07-03, och modifierades senast 2017-01-12
