August 27, 2017 to September 1, 2017
RAI Congress Center, Amsterdam, The Netherlands
Europe/Amsterdam timezone


Aug 29, 2017, 1:15 PM
1h 45m
Posters Area

Posters Area

Poster Presentation of 1h45m A2 - Resistive Accelerator Magnets Tue-Af-Po2.02


Dr Jie Liu (Argonne National Laboratory)


Quadrupole magnets are used extensively in particle accelerators, synchrotrons, and storage rings all over the world. Excellent field quality in these quadrupole magnets is needed at these facilities, which requires machining the magnet parts to high precision with conventional magnet designs. An eight-piece quadrupole design and assembly method are developed that produce the desired magnetic field quality by accurately positioning the pole tips in a quadrupole magnet. In this magnet, all the parts need to be machined only within standard machining tolerances [1]. This paper presents the magnetic and mechanical tolerance analyses of this eight-piece quadrupole magnet. We performed mechanical tolerance stack-up analyses using the Teamcenter Variation Analysis software [2] to evaluate the relationship of part-level machining tolerances to final magnet assembly errors. We then performed finite element analyses using OPERA [3] to estimate the effect of assembly errors on magnetic field quality and in turn to set the acceptable machining tolerances for parts to achieve the desired magnetic performances. We conclude from our tolerance analyses that 20 microns symmetry in pole tip gaps can be achieved with 50 micron standard machining tolerances, resulting in improved field quality. The analysis results are compared to magnetic measurements of the R&D eight-piece quadrupole magnets.

Submitters Country USA

Primary author

Dr Jie Liu (Argonne National Laboratory)


Mr Rogue Dejus (Argonne National Laboratory) Mr Aric Donnelly (Argonne National Laboratory) Mr Chuck Doose (Argonne National Laboratory) Dr Animesh Jain (Argonne National Laboratory) Mr Mark Jaski (Argonne National Laboratory)

Presentation materials