| Paper | Title | Page |
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| THPPH012 | Dark Current Collimation and Modified Gun Geometry for the European X-Ray FEL Project | 579 |
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| An rf field of 60 MV/m will be applied at the L-band gun of the European X-ray FEL project. Such a high rf gradient will allow to achieve a transverse emittance lower than 1 mm mrad for 1 nC electron bunches but will also produce dark current up to the order of mA. The dark current generated at the gun shows a comparable dynamics to the electron beam because the same acceleration will be furnished from the gun to the last acceleration module. The dark current might accumulate high radiation dose at the undulator and limit the long pulse operation of the SASE. To reduce dark current before the first acceleration module, a new design of gun cavity and collimator is proposed. | ||
| THPPH023 | Tuning, Conditioning, and Dark Current Measurements of a New Gun Cavity at PITZ | 609 |
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| In December 2005, a new gun cavity for the Photo Injector Test Facility at DESY in Zeuthen (PITZ) was tuned at Hamburg with the help of a specially designed tuning device. The tuning processus and its results as well as RF measurements will be presented. Meanwhile, the cavity was installed in the PITZ facility and conditioned. Dark current measurements with different cathodes were undertaken and will be described in the paper. Comparisons to former measurements will be made. |