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| TUPMA016 |
Computation of Wakefields and Impedances for the PETRA III Longitudinal Feedback Cavity
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124 |
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- A. K. Bandyopadhyay, A. Joestingmeier, A. S. Omar
Otto-Von-Guericke University, Magdeburg
- K. Balewski, R. Wanzenberg
DESY, Hamburg
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At DESY the existing PETRA II storage ring will be converted into a 3rd generation synchrotron radiation source, called PETRA III. The total beam current is limited by coupled bunch instabilities, which are mainly driven by the parasitic modes of the RF cavities. It is planned to use longitudinal and transverse feedback systems to achieve the design current of 100 mA. Eight single cell feedback cavities will be installed into the PETRA III ring to damp the coupled bunch longitudinal phase oscillations. It is important to know the contribution of the feedback cavity to the impedance budget of PETRA III. In this article, the wake and impedance computation results, using the loss and kick parameters, will be reported. The computer codes MAFIA and Microwave Studio have been used to compute the electromagnetic fields.
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