Study on the Function of Dipole Stabilizer Rods in an RFQ Accelerator

FU Shi-Nian; OUYANG Hua-Fu; XU Tao-Guang

Chinese Physics C> 2005, Vol. 29> Issue(3) : 295-300

Study on the Function of Dipole Stabilizer Rods in an RFQ Accelerator

Institute of High Energy Physics,CAS,Beijing 100049,China

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Abstract：
Dipole field in an RFQ accelerator exerts beam a bending force and thus results in beam losses on the machine. Measures must be taken to diminish the influence of the dipole field. Dipole stabilizer rod was proposed to shift the dipole modes far from the working quadrupole mode. In our recent measurements on a cold model RFQ, we observed some new phenomena associated with the function of dipole stabilizer rods. In this paper we report our results and give an analysis on these results. A new idea of imbalance insertion of the dipole stabilizer rods is proposed for both shifting dipole mode and reducing the dipole components in an asymmetrical RFQ.

References

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. Howard P, Lancaster H. Technique for Stabilizing a Four-Vane Radio Frequency Quadruple Structure. In: Proc. 7th Conf . on Application of Accelerat ors in Research and Industry. North Holland, 19822. Ueno A et al. First Operation of a 432-MHz 3MeV RFQ Stabilized with PISLs. In: Proc. of 1994 LINAC Conference. 1994. 166 1683. Schrage D et al. A Flight-Qualified RFQ for the BEAR Project . In:Proc. of the 1988 Linear Accelerator Conf erence. CEBAF-Report-89-001, 544. Young L M, Rybarcyk L. Tuning the LEDA RFQ 6. 7MeV Accelerator.In: Proc. of LINAC-98. 1998. 270 2725. FU Shi-Nian, GUAN Xia- Ling et al. R D St atus of a 3. 5MeV RFQ Accelerator for ADS Study in China. In: Proc. of LINAC'-2002. 2002,154 1566. GUO Zhi-Yu, FANG Jia-Xun et al. HEP NP, 2004, 28( 7) : 762(in Chinese)(郭之虞,方家驯等,高能物理与核物理, 2004, 28(7 ) :762 )7. OUYANG H F, FU SN et al .HEP NP, 2004, 28( 7) : 753 (欧阳华甫,傅世年等,高能物理与核物理,2004,28(7) :753)8. Billen J, Young L. Poisson Superfish,LA-UR-96-1834

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FU Shi-Nian, OUYANG Hua-Fu and XU Tao-Guang. Study on the Function of Dipole Stabilizer Rods in an RFQ Accelerator[J]. Chinese Physics C, 2005, 29(3): 295-300.

FU Shi-Nian, OUYANG Hua-Fu and XU Tao-Guang. Study on the Function of Dipole Stabilizer Rods in an RFQ Accelerator[J]. Chinese Physics C, 2005, 29(3): 295-300. shu

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Received: 2004-07-26
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

Study on the Function of Dipole Stabilizer Rods in an RFQ Accelerator

Corresponding author: FU Shi-Nian,

Institute of High Energy Physics,CAS,Beijing 100049,China

Received Date: 2004-07-26
Accepted Date: 1900-01-01
Available Online: 2005-03-05

Abstract: Dipole field in an RFQ accelerator exerts beam a bending force and thus results in beam losses on the machine. Measures must be taken to diminish the influence of the dipole field. Dipole stabilizer rod was proposed to shift the dipole modes far from the working quadrupole mode. In our recent measurements on a cold model RFQ, we observed some new phenomena associated with the function of dipole stabilizer rods. In this paper we report our results and give an analysis on these results. A new idea of imbalance insertion of the dipole stabilizer rods is proposed for both shifting dipole mode and reducing the dipole components in an asymmetrical RFQ.