Title |
Lattice Matching with Elegant at ELSA |
Authors |
- J.-P. Thiry, W. Hillertpresenter
ELSA, Bonn, Germany
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Abstract |
The electron stretcher ring ELSA provides a beam of polarized electrons of up to 3.2 GeV energy. To preserve the initial degree of polarization, several depolarizing resonances have to be compensated during the fast energy ramp of 6 GeV/s. Beam depolarization, caused by crossing these resonances is studied using comprehensive numerical calculations. These depend essentially on a precise model of the actual magnetic field distributions, explicitly taking into account misalignments. Hence it is necessary to match the theoretical lattice to the actual accelerator. In a first step the alignment of all magnets has been examined and improved. This was done by using standard survey equipment and precise electronic spirit levels. In a second step the concept of response matrix fitting is used for further, beam based, lattice matching. Particle tracking and optics calculations are carried out using elegant, a fully 6D accelerator toolbox. Lattice matching is done by repeatedly calling elegant and utilizing a modified Levenberg-Marquardt optimizer. In this contribution we will describe our lattice fitting implementation.
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Paper |
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Conference |
IPAC2016, Busan, Korea |
Series |
International Particle Accelerator Conference (7th) |
Proceedings |
Link to full IPAC2016 Proccedings |
Session |
Poster Session |
Date |
11-May-16 16:00–18:00 |
Main Classification |
06 Beam Instrumentation, Controls, Feedback and Operational Aspects |
Sub Classification |
T17 Alignment and Survey |
Keywords |
closed-orbit, dipole, lattice, quadrupole, simulation |
Publisher |
JACoW, Geneva, Switzerland |
Editors |
Christine Petit-Jean-Genaz (CERN, Geneva, Switzerland); Dong Eon Kim (PAL, Pohang, Republic of Korea); Kyung Sook Kim (PAL, Pohang, Republic of Korea); In Soo Ko (POSTECH, Pohang, Republic of Korea); Volker RW Schaa (GSI, Darmstadt, Germany) |
ISBN |
978-3-95450-147-2 |
Published |
June 2016 |
Copyright |
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