Equipartitioning Design Method of a Quasi-Periodic Focusing-Accelerating Coupled System

FU Shi-Nian; GUAN Xia-Ling; FANG Shou-Xian

Chinese Physics C> 2002, Vol. 26> Issue(1) : 79-86

Equipartitioning Design Method of a Quasi-Periodic Focusing-Accelerating Coupled System

Institute of High Energy Physics, CAS, Beijing 100039, China2 China Institute of Atomic Energy, Beijing 102413, China

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Abstract：
Intense-leam proton linac sets a very severe requirement on the control of beam loss and emittance growth. Beam physics theory demonstrates that coupling of the strong space charge effect between different freedoms with different temperature will surely increase the beam emittance in the way of beam coherent instability. Therefore it is necessary to design an intense beam accelerator in accordance with the equipartitioning principle. However, this design is too tedious to reach full equipartitioning because the real proton linac is a quasi-periodic coupling system. Thus, we made a few modifications to TRACE3-D, which is a popular code in beam dynamics, and added the equipartitioning design function to it. When the modified TRACE3-D is used together with the PARMILA code, it is easy to realize equipartitioning. This paper will introduce the modification to TRACE3-D code, and then illustrate its application to the design of a DTL linac section, which shows the importance of equipartitioning design in the intense beam linac.

References

[1]

. FANG Shou-Xian. Important Applications of Intense-beam Proton Accelerators. On the VI National Annual Academic Meeting on Accelerators, 2000(in Chinese)(方守贤. 强流质子加速器的重大应用. 第六届全国粒子加速器学术年会, 2000)2. Takeda H. PARMILA, LA-UR–98–4478, 1998, Revised Feb. 16, 20003. Crandall K R, Rusthoi D P. TRACE3-D Documentation, LA-UR-97-8864. LI De-Shan. Research on the Dynamics Design of Intense- beam RFQ Accelerators, Doctorate Thesis, Peking University, 1996(in Chinese)(李德山. 强流RFQ加速器的动力学设计研究, 北京大学博士学位论文, 1996) 5. James on RA. AIP Conference Proceedings, Wurtele J S ed. 1993, 279: 9696. Reiser M. Theory and Design of Charged Particle Beams, John Wiley Sons. Inc., 1994

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FU Shi-Nian, GUAN Xia-Ling and FANG Shou-Xian. Equipartitioning Design Method of a Quasi-Periodic Focusing-Accelerating Coupled System[J]. Chinese Physics C, 2002, 26(1): 79-86.

FU Shi-Nian, GUAN Xia-Ling and FANG Shou-Xian. Equipartitioning Design Method of a Quasi-Periodic Focusing-Accelerating Coupled System[J]. Chinese Physics C, 2002, 26(1): 79-86. shu

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Received: 2001-01-08
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

Equipartitioning Design Method of a Quasi-Periodic Focusing-Accelerating Coupled System

Corresponding author: FU Shi-Nian,

Institute of High Energy Physics, CAS, Beijing 100039, China2 China Institute of Atomic Energy, Beijing 102413, China

Received Date: 2001-01-08
Accepted Date: 1900-01-01
Available Online: 2002-01-05

Abstract: Intense-leam proton linac sets a very severe requirement on the control of beam loss and emittance growth. Beam physics theory demonstrates that coupling of the strong space charge effect between different freedoms with different temperature will surely increase the beam emittance in the way of beam coherent instability. Therefore it is necessary to design an intense beam accelerator in accordance with the equipartitioning principle. However, this design is too tedious to reach full equipartitioning because the real proton linac is a quasi-periodic coupling system. Thus, we made a few modifications to TRACE3-D, which is a popular code in beam dynamics, and added the equipartitioning design function to it. When the modified TRACE3-D is used together with the PARMILA code, it is easy to realize equipartitioning. This paper will introduce the modification to TRACE3-D code, and then illustrate its application to the design of a DTL linac section, which shows the importance of equipartitioning design in the intense beam linac.