| Paper |
Title |
Page |
| MOPCH012 |
FEL Disturbance by Ambient Magnetic Field Changes
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74 |
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- H. Kapitza, P. Göttlicher, N. Heidbrook, H. Schlarb
DESY, Hamburg
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The VUV-FEL at DESY in Hamburg (Germany) is mostly located inside the circular accelerator PETRA which serves as an injector for the electron proton collider HERA. SASE was regularly lost in the VUV-FEL when protons were ramped to the injection energy in PETRA. This effect was mediated by magnetic field changes in the order of 1 microtesla, caused by time-dependent uncompensated magnet currents of more than 800 A which made PETRA act like a large current loop. The resulting beam displacements of several hundred micrometers in the undulators proved to be enough to make SASE fail. This serious disturbance of user runs was eliminated by introducing an improved compensation scheme which further limits residual currents in PETRA during proton injection. The consequences of this observation for the design of the XFEL are briefly discussed.
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| TUPCH025 |
Precision RF Gun Phase Monitor System for the VUV-FEL
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1052 |
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- H. Schlarb, N. Heidbrook, H. Kapitza, F. Ludwig, N. Nagad
DESY, Hamburg
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For RF photo-injectors, the properties of the high brightness beam critically depend on the synchronization between the RF gun acceleration phase and the photo-cathode laser. At the VUV-FEL, the phase stability is determined by operating the RF gun close to zero-crossing RF phase. This allows the conversion of phase variations into charge variations which then is readout by a precision charge measurement system based on toroids. In this paper, we discuss the limitation of this method. Resolution reduction of the charge measurement system due to electro-magnetic-interference is discussed in detail.
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