Würzburg 2018 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 4: Diagnostics, Control and Instrumentation

AKBP 4.7: Talk

Tuesday, March 20, 2018, 18:00–18:15, NW-Bau - HS4

Evaluation of a Cone-Program Based Approach to Orbit Correction at the Electron Storage Ring Delta — •Stephan Kötter, Bernard Riemann, Benjamin Dirk Isbarn, Malte Sommer, and Thomas Weis — TU Dortmund University (DELTA) Center for Synchrotron Radiation

A new program for orbit correction is currently being developed at the electron storage ring Delta. The optimization problem of finding a set of dipole-field-strength variations which minimize the deviation of the orbit from a reference orbit can be parameterized as cone program. This parametrization allows for arbitrary, linear constraints. Robust and fast solvers for this type of problem exist.

This presentation focuses on a comparison of correction results of the aforementioned program for three algorithms. These algorithms are singular value decomposition (SVD), the limited-memory Broyden-Fletcher-Goldfarb-Shanno algorithm with box constraints (L-BFGS-B) and a solver for cone programs (from cvxopt python package). After a short introduction to cone programming, measurements are shown along with numerical convergence studies.