ROXIE: A Computer Code for the Integrated Design of Accelerator Magnets

The paper describes the ROXIE software program package which has been developed for the design of the superconducting magnets for the LHC at CERN. The software is used as an approach towards the integrated design of superconducting magnets including feature-based coil geometry creation, conceptual design using genetic algorithms, optimization of the coil and iron cross-sections using a reduced vector-potential formulation, 3-D coil end geometry and field optimization using deterministic vector-optimization techniques, tolerance analysis, production of drawings by means of a DXF interface, end-spacer design with interfaces to CAD-CAM for the CNC machining of these pieces, and the tracing of manufacturing errors using field quality measurements

Comparative Study of Different Coils for the LHC Main Dipoles

The 5 block dipole coil cross-section as described in the "White Book" has been subject to a number of changes which made the design inflexible to accommodate further adjustments if they become necessary at a later stage. In the meanwhile a new optimization algorithm based on genetic optimization algorithms and the concept of niching was implemented in the program package ROXIE that is used for the coil block optimization of the superconducting magnets. Two alternative solutions with 6 clocks were found. The aim of this report is thus to compare the designs in view of flexibility, manufacturability and sensitivity to tolerances

Field quality in accelerator magnets

The field quality in the superconducting magnets is expressed in terms of the coefficients of the Fourier series expansion of the field in the aperture, at a reference radius. Scaling laws for different coefficients and reference radii are presented and the field generated by line currents in 2 and 3 dimensions is derived from basic principles