This title appears in the Scientific Report :
2000
Please use the identifier:
http://hdl.handle.net/2128/2387 in citations.
24 segment high field permanent sextupole magnets
24 segment high field permanent sextupole magnets
We report on the design, construction, and magnetic field measurements of a system of high field sextupole magnets made from NdFeB compounds. The magnets are utilized as a focusing system for neutral hydrogen (or deuterium) atoms in a polarized atomic beam source based on Stern-Gerlach spin separati...
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Personal Name(s): | Vassiliev, A. |
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Nelyubin, V. / Koptev, V. / Kravtsov, P. / Lorentz, B. / Marik, H. J. / Mikirtychyants, M. / Nekipelov, M. / Rathmann, F. / Paetz gen. Schieck, M. M. / Seyfarth, H. / Steffens, E. | |
Contributing Institute: |
Institut für Kernphysik; IKP |
Published in: | Review of scientific instruments, 71 (2000) S. 3331 |
Imprint: |
[S.l.]
American Institute of Physics
2000
|
Physical Description: |
3331 |
Document Type: |
Journal Article |
Research Program: |
Experimente an COSY |
Series Title: |
Review of Scientific Instruments
71 |
Subject (ZB): | |
Link: |
OpenAccess |
Publikationsportal JuSER |
We report on the design, construction, and magnetic field measurements of a system of high field sextupole magnets made from NdFeB compounds. The magnets are utilized as a focusing system for neutral hydrogen (or deuterium) atoms in a polarized atomic beam source based on Stern-Gerlach spin separation. Each magnet consists of 24 segments of permanently magnetized material differing in remanence and coercivity to reduce demagnetization. According to quadratic extrapolation to the pole tip the magnetic flux density reaches values of up to B-0=1.69 T. Three-dimensional field calculations using the MAFIA code were carried out to optimize the magnet performance and to avoid demagnetization by selecting appropriate materials for the individual segments. Measurements of the radial, azimuthal, and longitudinal magnetic flux density distributions were carried out by means of a small Hall probe (100x200x15 mu m(3)). The measurements with the small probe permitted to extract experimentally higher order multipole components very close (similar to 100 mu m) to the inner surface. Experimental values obtained are compared to predictions based on MAFIA calculations and on the Halbach formalism. (C) 2000 American Institute of Physics. [S0034-6748(00)05309-0]. |