Title :
Effects of vertical girder realignment in the Argonne APS storage ring
Author :
Lessner, E. ; Crosbie, E. ; Milton, S.
Author_Institution :
Argonne Nat. Lab., IL, USA
Abstract :
The effects of vertical girder misalignments on the vertical orbit of the Advanced Photon Source (APS) storage ring are studied. Partial sector-realignment is prioritized in terms of the closed-orbit distortions due to misalignments of the corresponding girders in the sectors. A virtual girder-displacement (VGD) method is developed that allows the effects of a girder realignment to be tested prior to physically moving the girder. The method can also be used to anticipate the corrector strengths needed to restore the beam orbit after a realignment. Simulation results are compared to experimental results and found to reproduce the latter quite closely. Predicted corrector strengths are also found to be close to the actual local corrector strengths after a proof-of-principle two-sector realignment was performed
Keywords :
accelerator magnets; electromagnets; electron accelerators; particle beam stability; storage rings; Advanced Photon Source; Argonne APS storage ring; accelerator magnets; closed-orbit distortions; corrector strengths; partial sector-realignment; simulation results; two-sector realignment; vertical girder misalignments; vertical girder realignment; vertical orbit; virtual girder-displacement; Contracts; Laboratories; Lattices; Linear particle accelerator; Performance analysis; Performance evaluation; Predictive models; Storage rings; Structural beams; Testing;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.792679
