Chinese Physics C > 2001, Vol. 25 > Issue(3): 264-270

Theoretical Analysis and Computer Simulation of Eddy-Current Septum Magnets

Institute of High Energy Physics, Chinese Academy of Science, Beijing 100039, China2 Institute for Heavy Ion Physics Research, Peking University, Beijing 100871, China

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Abstract：
The stray field of eddy current septum magnets is analyzed theoretically and also simulated by a computer program. The results from theoretical analysis agree well with those simulated from OPERA program. The maximum of stray field varies inversely with the thickness of septum. It delays some time with respect to the maximum of main field, and the delay time is proportional to square of the thickness of the septum. After stray field increases to its maximum, it starts to decrease very slowly to zero. To reduce stray field fast, one can adopt full sine wave pulse current to power the magnet, The stray field can be reduced to 0.2% at any position and any time by using composite septum (2.4mm Cu+0.6mm Fe). The homogeneity of the main field is superior to 1%.

References

[1]

Reirners R, Peterson J , Avery R et al. IEEE Trans. Nuclear Science, 1997, NS-26(3) : 4027-40292 Lopez F, Mills F, Milton S et al. The APS Thin Pulsed Septum Magnets 1994, Pm. 4th EPAC: 2406-24083 Rohner F. Magnetic Calculation on the Eddy Current Septum Magnet for the ESRF. 1990, ESRF Internal Note AT/MA/90-84 Kumagai K, Matsui S. IEEE Trans. Magn. 1994, 30(4) :2134-21375 Fabris R, Favari A, Tornrnasini D. A High Current Passive Septum Magnet for Elettra. 1992, P m . 2nd EPAC:1460-14626 Kang B K, Miiburn J E. Nucl. Instr. and Meth. in Phys. Res., 1997, A385:6-12

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KANG Wen, DING Xiao-Ping, HAN Qian, PANG Jia-Biao and CHEN Sen-Yu. Theoretical Analysis and Computer Simulation of Eddy-Current Septum Magnets[J]. Chinese Physics C, 2001, 25(3): 264-270.

KANG Wen, DING Xiao-Ping, HAN Qian, PANG Jia-Biao and CHEN Sen-Yu. Theoretical Analysis and Computer Simulation of Eddy-Current Septum Magnets[J]. Chinese Physics C, 2001, 25(3): 264-270. shu

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Received: 2000-01-24
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Theoretical Analysis and Computer Simulation of Eddy-Current Septum Magnets

Corresponding author:KANG Wen,

Institute of High Energy Physics, Chinese Academy of Science, Beijing 100039, China2 Institute for Heavy Ion Physics Research, Peking University, Beijing 100871, China

Received Date:2000-01-24
Accepted Date:1900-01-01
Available Online:2001-03-05

Abstract:The stray field of eddy current septum magnets is analyzed theoretically and also simulated by a computer program. The results from theoretical analysis agree well with those simulated from OPERA program. The maximum of stray field varies inversely with the thickness of septum. It delays some time with respect to the maximum of main field, and the delay time is proportional to square of the thickness of the septum. After stray field increases to its maximum, it starts to decrease very slowly to zero. To reduce stray field fast, one can adopt full sine wave pulse current to power the magnet, The stray field can be reduced to 0.2% at any position and any time by using composite septum (2.4mm Cu+0.6mm Fe). The homogeneity of the main field is superior to 1%.