Measurement of IR optics with linear coupling’s action-angle parametrization

Linear coupling’s action-angle parametrization is convenient for interpretation of turn-by-turn beam position monitor (BPM) data. We demonstrate how to apply this parametrization to extract Twiss and coupling parameters in interaction regions (IRs), using BPMs on each side of a long IR drift region....

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Published inPhysical review special topics. PRST-AB. Accelerators and beams Vol. 8; no. 8; p. 084001
Main Authors Luo, Y., Bai, M., Pilat, F., Satogata, T., Trbojevic, D.
Format Journal Article
LanguageEnglish
Published College Park American Physical Society 01.08.2005
Subjects
Coupling
Data acquisition
Dipoles
Heavy ions
Interaction parameters
Parameterization
Relativistic Heavy Ion Collider
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Summary:Linear coupling’s action-angle parametrization is convenient for interpretation of turn-by-turn beam position monitor (BPM) data. We demonstrate how to apply this parametrization to extract Twiss and coupling parameters in interaction regions (IRs), using BPMs on each side of a long IR drift region. Example data were acquired at the Relativistic Heavy Ion Collider, using an ac dipole to excite a single transverse eigenmode. We have measured the waist of the β function and its Twiss and coupling parameters.
ISSN:1098-4402
1098-4402
2469-9888
DOI:10.1103/PhysRevSTAB.8.084001