Calculations of Higher Multipole Components in a Large Superconducting Quadrupole Magnet
Journal Article
·
· Nuclear Instruments & Methods in Physics Research, Section A
OSTI ID:954165
We analyze the magnetic field of a finite length, large bore superconducting quadrupole magnet for use in a large aperture, high momentum magnetic spectrometer.In particular, we study the 12-pole and 20-pole components which would contribute to geometric aberations.The magnet is 130 cm long, has a pole radius of 4.3 cm, and the field is largely iron dominated.We analyze the magnet with a nominal field gradient of 276 gauss/cm.The field and/or the scalar potential is calculated with the program TOSCA and decomposed consistent with magnetostatic theory.We establish that the small multipole components are determined reliably and consistently.We find that although the absolute magnitude of the higher order multipoles can become quite large near the ends of the magnet, they reverse sign in this region and their contributions to the field integral are quite small.At the pole radius the integral contributions of the 12-pole (n=6) and 20-pole (n=10) are ~ 1.2*10^-2 and ~ 2.4*10^-
- Research Organization:
- Thomas Jefferson Lab National Accelerator Facility
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 954165
- Report Number(s):
- CEBAF-PR-90-27
- Journal Information:
- Nuclear Instruments & Methods in Physics Research, Section A, Journal Name: Nuclear Instruments & Methods in Physics Research, Section A Vol. 301; ISSN NIMAER; ISSN 0168-9002
- Country of Publication:
- United States
- Language:
- English
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