Chinese Physics C > 2003, Vol. 27 > Issue(4): 363-366

Using Axial Magnetized Permanent Rings to Build Axial Gradient Magnetic Field

PENG Quan-Ling^,,
ZHAO Qi

Institute of High Energy Physics, CAS, Beijing 100039, China2 Pingdingshan Television University, He′nan Pingdingshan 467000, China

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Abstract：
Axial field produced by an axially magnetized permanent ring was studied. For two permanent magnet rings, if they are magnetized in the same direction, a nearly uniform axial field can be produced; if they are magnetized in opposite direction, an axial gradient field can be produced in the region between the two permanent rings, with the field strength changing from-B ₀to B ₀. A high gradient axial magnetic field has been built by using two axially magnetized permanent rings, the measured field results agree with the PANDIRA calculation very well. It is desirable that the field gradient can be varied to match various requirements. A method to produce the variable gradient field is presented. Axial gradient field can also be used as a beam focusing facility for linear accelerator if axial periodic field can be produced. Its magnetic field is similar to that of a solenoid, in which, large stray field will leak to the outside environment. A method for shielding the outside stray field is discussed.

References

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PENG Quan-Ling and ZHAO Qi. Using Axial Magnetized Permanent Rings to Build Axial Gradient Magnetic Field[J]. Chinese Physics C, 2003, 27(4): 363-366.

PENG Quan-Ling and ZHAO Qi. Using Axial Magnetized Permanent Rings to Build Axial Gradient Magnetic Field[J]. Chinese Physics C, 2003, 27(4): 363-366. shu

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Received: 2002-04-25
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

Using Axial Magnetized Permanent Rings to Build Axial Gradient Magnetic Field

PENG Quan-Ling^,
ZHAO Qi

Corresponding author:PENG Quan-Ling,

Institute of High Energy Physics, CAS, Beijing 100039, China2 Pingdingshan Television University, He′nan Pingdingshan 467000, China

Received Date:2002-04-25
Accepted Date:1900-01-01
Available Online:2003-04-05

Abstract:Axial field produced by an axially magnetized permanent ring was studied. For two permanent magnet rings, if they are magnetized in the same direction, a nearly uniform axial field can be produced; if they are magnetized in opposite direction, an axial gradient field can be produced in the region between the two permanent rings, with the field strength changing from-B₀to B₀. A high gradient axial magnetic field has been built by using two axially magnetized permanent rings, the measured field results agree with the PANDIRA calculation very well. It is desirable that the field gradient can be varied to match various requirements. A method to produce the variable gradient field is presented. Axial gradient field can also be used as a beam focusing facility for linear accelerator if axial periodic field can be produced. Its magnetic field is similar to that of a solenoid, in which, large stray field will leak to the outside environment. A method for shielding the outside stray field is discussed.