Darmstadt 2016 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 11: Poster
AKBP 11.11: Poster
Mittwoch, 16. März 2016, 18:30–20:30, S1/05 22-24
Transverse Emittance Reduction for an SRF Photoinjector — •Hannes Vennekate1,2, André Arnold1, Dietmar Janssen1, Peter Kneisel3, Pengnan Lu1,2, Petr Murcek1, Jochen Teichert1, and Rong Xiang1 — 1Helmholtz-Zentrum Dresden-Rossendorf — 2Technical University Dresden — 3Thomas Jefferson National Accelerator Facility
In May 2014 the first SRF photo injector at HZDR has been replaced by a new version, the ELBE SRF Gun II, featuring a new resonator and cryostat. The intention for this upgrade has been to reach for higher beam energies, bunch charges and therefore an increased average beam current, which is to be injected into the superconducting, CW ELBE accelerator, where it can be used for multiple purposes, such as THz generation or Compton back-scattering. Because of the increased bunch charge of this injector compared to its predecessor, it demands upgrades of the existing and/or novel approaches to alleviate the transverse emittance growth. One of these methods is the integration of a superconducting solenoid into the cryostat. Another method, the so called RF focusing, is realized by displacing the photo cathode's tip and retracting it from the last cell of the resonator. In this case, part of the accelerating field is sacrificed for a better focus of the electron bunch right at the start of its generation. Besides particle tracking simulations, a recent study, investigating on the exact position of the cathode tip with respect to the cell's back plane after tuning and cool down, has been performed.