PAC09 - List of Authors (Lens, D.)

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Lens, D.

Paper	Title	Page
WE5PFP100	Beam Loading Effects on the RF Control Loops of a Double-Harmonic Cavity System for FAIR	2249
	D. Lens TU Darmstadt, RTR, Darmstadt P. Hülsmann, H. Klingbeil GSI, Darmstadt
	Funding: This work was partly supported by Deutsche Telekom Stiftung. The effects of heavy beam loading on the RF control loops of a double-harmonic cavity system are examined. This cavity system that will be realized at the GSI Helmholtzzentrum für Schwerionenforschung in the scope of the SIS18 upgrade program consists of a main broadband cavity and a second harmonic narrowband cavity. The cavities comprise both an amplitude and a phase feedback loop. In addition, the narrowband cavity includes a feedback loop which controls its resonance frequency to follow the main RF frequency. After modelling the cavity system and the feedback loops, an analytic controller design is presented. In addition, longitudinal beam dynamics are added to the cavity model to allow a detailed simulation of the cavity-beam interaction. Realistic simulation results are given for an acceleration cycle of heavy-ions to demonstrate the performance of the RF control loops.

Paper

Title

Page

WE5PFP100

Beam Loading Effects on the RF Control Loops of a Double-Harmonic Cavity System for FAIR

2249

D. Lens
TU Darmstadt, RTR, Darmstadt
P. Hülsmann, H. Klingbeil
GSI, Darmstadt

Funding: This work was partly supported by Deutsche Telekom Stiftung.

The effects of heavy beam loading on the RF control loops of a double-harmonic cavity system are examined. This cavity system that will be realized at the GSI Helmholtzzentrum für Schwerionenforschung in the scope of the SIS18 upgrade program consists of a main broadband cavity and a second harmonic narrowband cavity. The cavities comprise both an amplitude and a phase feedback loop. In addition, the narrowband cavity includes a feedback loop which controls its resonance frequency to follow the main RF frequency. After modelling the cavity system and the feedback loops, an analytic controller design is presented. In addition, longitudinal beam dynamics are added to the cavity model to allow a detailed simulation of the cavity-beam interaction. Realistic simulation results are given for an acceleration cycle of heavy-ions to demonstrate the performance of the RF control loops.