Matched and equipartitioned design method for modern high-intensity radio frequency quadrupole accelerators

Matched and equipartitioned design method for modern high-intensity radio frequency quadrupole accelerators
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现代高强度射频四极加速器匹配均分设计方法

DOI:
10.1016/j.nima.2007.03.031
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发表时间:
2007-07
影响因子:
1.4
通讯作者:
--
中科院分区:
物理与天体物理3区
文献类型:
--
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本文提出了一种新的射频四极杆(RFQ)动力学设计方法——匹配和均分(EP)设计方法,该方法考虑了通过保持波束包络匹配和波束内能量平衡以及避免结构共振来防止高强度直线加速器的发射度增长和光晕形成詹姆森,IEEE译。诊断。科学。Ns-28 (1981) 2408;R.A. Jameson等人,高强度线性加速器的缩放和优化,LA-CP-91-272,洛斯阿拉莫斯国家实验室,1991年7月(LINACS设计规范的介绍);R.A. Jameson, AIP Conf. pro279 (1992) 969;R.A. Jameson,一种光束损耗最小化的基本研究方法,参见:Y.K. Batygin(主编),第480卷,空间电荷主导的重离子聚变束物理,日本,1998年12月。由于线性加速器有三个以上的参数,但只有三个方程(两个包络方程和一个EP方程)可用于设计RFQ加速器的绕束结构参数,因此其他的必须由附加规则确定。根据这些公式和规则,北京大学编写了一个新的RFQ设计代码MATCHDESIGN。利用该程序生成了三个实例设计,并与传统RFQ进行了仿真比较,验证了新方法的可行性和优越性。
A new design method—Matched and equipartitioned (EP) design method—has been proposed for radio frequency quadrupole (RFQ) dynamics design, on the considerations of preventing emittance growth and halo formation in high-intensity linacs by means of keeping beam envelope matched and energy balance within the beam, as well as avoiding structure resonances [R.A. Jameson, IEEE Trans. Nucl. Sci. NS-28 (1981) 2408; R.A. Jameson et al., Scaling and optimization in high-intensity linear accelerators, LA-CP-91-272, Los Alamos National Laboratory, July 1991 (introduction of LINACS design code); R.A. Jameson, AIP Conf. Proc. 279 (1992) 969; R.A. Jameson, An approach to fundamental study of beam loss minimization, in: Y.K. Batygin (Ed.), AIP Conference Proceedings, vol. 480, Space Charge Dominated Beam Physics for Heavy Ion Fusion, Saitama, Japan, December 1998]. As there are more than three parameters for a linear accelerator, but only three equations (two envelope equations and an EP equation) are available to design the structural parameters of the RFQ accelerator around the beam, therefore the others have to be determined by additional rules. Following these equations and rules, a new RFQ design code named MATCHDESIGN has been written at Peking University. Three example designs are generated by this code and their simulation results have been compared with a conventional RFQ, which had proved the feasibilities and merits of the new method.
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