Multipole fields in the antiproton accumulator magnet system

Autin, B.; Bellanger, A.; Billinge, R.; Brown, R.C.A.; Johnson, C. D.; Jones, E.; Sherwood, R. C.; Umstätter, H H

doi:10.1109/tmag.1981.1061263

Cited by 6 publications

(2 citation statements)

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“…The optimization was performed inside a circular region 12 cm in diameter at the centre of the magnet. The values of the inhomogeneity have been calculated in ppm (parts per million) as the root mean square error inside a 12 × 12 cm 2 To illustrate the impressive improvement in homogeneity, we show in figure 5 the inhomogeneity mapping, point by point, before (figure 5(A)) and after (figure 5(B)) the application of the optimization algorithm on the configuration shown in figure 4B, using rods of 2 cm diameter. The result not only demonstrates the extremely good performance of the optimization algorithm, but also clearly shows the presence of large field inhomogeneities caused by the presence of the iron screen.…”

Section: Results and Conclusionmentioning

confidence: 99%

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Automatic optimization strategy for the design of circular multipolar magnets

Cirio

Lucidi

Placidi

et al. 2001

J. Phys. D: Appl. Phys.

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This paper presents an optimization procedure for the design of circular magnets of multipolar symmetry in the presence of an iron screen. The procedure is based on the combined use of field calculations and optimization techniques and can be applied when the field is generated either by a distribution of currents or of magnetic materials. The numerical optimization technique uses the positions and/or orientations of the field generating elements as parameters (currents or permanent magnets). The technique has proved to be very effective in obtaining a good uniformity of field in a large fraction of the magnet volume. It should reduce the subsequent shimming operations. The method is almost completely automatic and simpler than other standard methods normally used to design new magnet geometries which are based on field calculation programs and 'manual' optimization procedures.

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Section: Results and Conclusionmentioning

confidence: 99%

“…In cylindrical magnets of multipolar symmetry [1][2][3][4], the field can be generated by coils, poles or permanent magnets enclosed by an iron screen used to improve the efficiency of the magnet. Figure 1 shows the concept on which the cylindrical multipolar magnet is based.…”

Section: Introductionmentioning

confidence: 99%