| Title |
Effect of Model Errors on the Closed Orbit Correction at the SIS18 Synchrotron of GSI |
| Authors |
- S.H. Mirza, P. Forck, H. Klingbeil, R. Singhpresenter
GSI, Darmstadt, Germany
- H. Klingbeil
TEMF, TU Darmstadt, Darmstadt, Germany
|
| Abstract |
A fast closed orbit feedback system (bandwidth in the order of 1 kHz) is under development at the GSI SIS18 synchrotron for the orbit correction from injection to extraction including the acceleration ramp. The static process model, represented as the orbit response matrix (ORM), is subjected to the systematic optics changes during ramp e.g. beta function and phase advance variations at the locations of BPMs and steerers. In addition to these systematic variations, model mismatches may arise from dipole and quadrupole magnet errors, space charge dependent tune shift as well as BPM and steerer calibration errors. In this contribution, the effects of these model errors on the closed orbit correction are investigated which is necessary for the robust stability analysis of the feedback controller. For the robustness tests, the traditional SVD-based matrix pseudo-inversion is compared to a Fourier-based analysis. The results are achieved by detailed simulations in MADX.
|
| Funding |
Deutscher Akademischer Austauschdienst under contract No. 91605207 |
| Paper |
download WEPAK003.PDF [0.417 MB / 4 pages] |
| Export |
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| Conference |
IPAC2018, Vancouver, BC, Canada |
| Series |
International Particle Accelerator Conference (9th) |
| Proceedings |
Link to full IPAC2018 Proccedings |
| Session |
MC6 Poster Session |
| Date |
02-May-18 09:00–12:00 |
| Main Classification |
06 Beam Instrumentation, Controls, Feedback, and Operational Aspects |
| Sub Classification |
T05 Beam Feedback Systems |
| Keywords |
quadrupole, synchrotron, closed-orbit, controls, focusing |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editors |
Shane Koscielniak (TRIUMF, Vancouver, BC, Canada); Todd Satogata (JLab, Newport News, VA, USA); Volker RW Schaa (GSI, Darmstadt, Germany); Jana Thomson (TRIUMF, Vancouver, BC, Canada) |
| ISBN |
978-3-95450-184-7 |
| Published |
June 2018 |
| Copyright |
|
