Characteristic of the 60°C-Dipole for CSR

HE Yuan; XIONG Hui; LIU Wei-Jun; HAN Shao-Fei; YUAN Ping; MA Li-Zhen; ZHANG Bin; WANG Wen-Jin; WANG Yue; XIA Jia-Wen

Chinese Physics C> 2003, Vol. 27> Issue(6) : 532-536

Characteristic of the 60°C-Dipole for CSR

Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China2 Graduate School of the Chinese Academy of Sciences,Beijing 100039,China

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Abstract：
The trimming coils embedded in poles of magnet are applied in the C-dipole prototypes of CSR. They are used to adjust the uniformity of magnetic fields through reducing outside magnetic field and augmenting inside. The impact of trimming currents on the uniformity of field and multipole components is carefully investigated by using the two kinds of magnetic measurements,hall sensor and long coil,respectively. It is proved that the uniformity which is better than ±1.0×10 -3 can be reached easily. At the same time,the quadrupole and sextupole components of fields have decreased to a low level through optimizing the trimming currents,but,unfortunately,the octupole and dodecapole will increase correspondingly. Finally,the two measured and calculated results are compared. There is very small difference between the results of the two measuring methods. However,all of the measured results are alien to the calculated one because of the insufficiency of the TOSCA calculation.

References

[1]

. XIA J W et al.NIMA ,2002,488:11—252. XIA Jia-Wen et al.Nuclear Physics Review,2001,18(1):35—36(in Chinese)(夏佳文等.原子核物理评论,2001,18(1):35—36)3. Halbach K.NIM,1973,107:515—5284. Bryant P J.CAS,CERN 92—05,Geneva:19925. JIANG C J.Scientific Calculation and CProgram Library,Beijing:Uni versity of Science and Technology of China Press,1998,198—204(in Chinese)(蒋长锦.科学计算和C程序集,北京:中国科技大学出版社,1998,198—204)

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HE Yuan, XIONG Hui, LIU Wei-Jun, HAN Shao-Fei, YUAN Ping, MA Li-Zhen, ZHANG Bin, WANG Wen-Jin, WANG Yue and XIA Jia-Wen. Characteristic of the 60°C-Dipole for CSR[J]. Chinese Physics C, 2003, 27(6): 532-536.

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Received: 2002-06-05
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

Characteristic of the 60°C-Dipole for CSR

Corresponding author: HE Yuan,

Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China2 Graduate School of the Chinese Academy of Sciences,Beijing 100039,China

Received Date: 2002-06-05
Accepted Date: 1900-01-01
Available Online: 2003-06-05

Abstract: The trimming coils embedded in poles of magnet are applied in the C-dipole prototypes of CSR. They are used to adjust the uniformity of magnetic fields through reducing outside magnetic field and augmenting inside. The impact of trimming currents on the uniformity of field and multipole components is carefully investigated by using the two kinds of magnetic measurements,hall sensor and long coil,respectively. It is proved that the uniformity which is better than ±1.0×10 -3 can be reached easily. At the same time,the quadrupole and sextupole components of fields have decreased to a low level through optimizing the trimming currents,but,unfortunately,the octupole and dodecapole will increase correspondingly. Finally,the two measured and calculated results are compared. There is very small difference between the results of the two measuring methods. However,all of the measured results are alien to the calculated one because of the insufficiency of the TOSCA calculation.