Würzburg 2018 – scientific programme
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 8: Poster session
AKBP 8.7: Poster
Wednesday, March 21, 2018, 18:00–19:30, NW-Bau - HS2
The spatial process model of the GSI-SIS18 synchrotron for the closed orbit feedback system — •Sajjad Hussain Mirza1,2, Peter Forck1, Rahul Singh1, and Harald Klingbeil1,2 — 1GSI Darmstadt, Planckstraße 1, 64291 Darmstadt,Germany — 2TEMF, Schlossgartenstraße 8, 64289 Darmstadt, Germany
A closed orbit feedback system is under development at the GSI SIS18 synchrotron for orbit correction during the whole acceleration ramp. Spatial process model of the system has been investigated and a replacement of the singular value decomposition (SVD) technique with a new faster Discrete Fourier Transform (DFT) based inversion of orbit response matrix (ORM) has been proposed, exploiting the Circulant symmetry of the synchrotron. A clear relation between SVD modes and singular values to DFT modes and coefficients has also been described. The DFT based decomposition gives hints on physical interpretation of SVD and DFT modes of the perturbed closed orbit. The use of DFT modes to provide robustness against BPM failures has been demonstrated with the help of MADX simulations.