Darmstadt 2016 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 11: Poster

AKBP 11.12: Poster

Mittwoch, 16. März 2016, 18:30–20:30, S1/05 22-24

Optimization of an SRF Gun for High Bunch Charge Applications at ELBE — •Pengnan Lu1,2, Andre Arnold1, Jochen Teichert1, Hannes Vennekate1,2, and Rong Xiang11HZDR, Dresden,Germany — 2TUD, Dresden, Germany

The performance of the ELBE SRF Gun II, to be operated in a high bunch charge mode, is investigated by simulations. The beam dynamics in the SRF injector itself are simulated by ASTRA, while the further beam transport is computed using the code of elegant. Firstly discussed is how to apply these two codes to the specific setting of the ELBE accelerator. Then the optimization of the SRF gun is explained, as well as the beam transport strategy for applications of THz radiation and Compton Backscattering experiments. Within the beam transport strategy, two important methods are presented: One is to utilize the space charge force to manipulate the longitudinal phase space; the other is to over-compress the bunch in a chicane to compensate the non-linear chirp from the RF cavities. As a result, for the THz experiments which require a high longitudinal charge density, the present setup of the ELBE accelerator with the SRF gun is able to provide 350 pC bunches with individual bunch length of 0.21 ps, or 500 pC bunches with a bunch length of 0.46 ps. For the Compton Backscattering experiments, where the bunch charge and the beam size are more critical, the maximum transportable bunch charge is around 500 pC, which can be focused down to an rms size of 0.36 mm.

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