DESIGN OF SLOW EXTRACTION FROM 50-GeV PROTON SYNCHROTRON
DESIGN OF SLOW EXTRACTION FROM 50-GeV PROTON SYNCHROTRON
复制标题
50-GeV 质子同步加速器慢速提取的设计
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
T. Yokoi
中科院分区：
文献类型：
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作者：
M. Tomizawa;Y. Arakaki;N. Tokuda;T. Yokoi
JAERI/KEK 联合项目的高强度 50-GeV 主环具有三重对称晶格。主环设计有慢速牵引系统。慢引出的关键问题是从辐射安全的角度将光束损失降低到1%的水平。已经对新晶格版本进行了束流模拟，以研究静电隔膜线处的束流损失。该结果显示隔膜线上的光束命中率为 1%。还报告了隔垫设计的现状和 MARS 的辐射研究。 LSS 具有较短的直线部分，两个聚焦四极磁铁之间几乎为零。 ESS 放置在短直段之一。 LSS 中的 和 为零。通过在弧形部分倾斜聚焦四极磁体 (QFN)，水平电子感应加速器调谐从共振 67/3 下方接近共振。 2 个系列的 72 个六极磁铁将水平和垂直色度设置为零。放置在弧形部分的 8 个 12 六极磁铁用于激发共振。这些六极磁体分为两个系列，以便能够旋转分界线。它们不会激发任何电流的 0 次谐波分量。 ESS 入口处的光束光学函数为 = 39.0 m，并且 = 0.001。 ESS 电线的位置使得入口端 = 58 mm；引出的光束被向内踢 0.2 mrad。 ESS 和第一个 SM 之间的电子感应加速器相位为 245.5 度，这使得 ESS 处的踢出粒子和未踢出粒子之间的间隔为 3.6 毫米。 LSS 中用于缓慢提取的隔垫和凸块磁体以及光束包络的布置如图 1 所示。
The high intensity 50-GeV main ring of the JAERI/KEK Joint Project has three fold symmetry lattice. Slow ex- traction system has been designed for the main ring. The key issue for the slow extraction is to reduce the beam loss to 1% level from the point of view of radiation safety. Beam simulations for a new lattice version have been done to study the beam loss at the electrostatic septum wires. This result shows the beam hit rate on the septum wires is 1%. Present status of septa design and a radiation study by MARS are also reported. The LSS has short straight sections with almost zero between two focusing quadrupole magnets. The ESS are placed at one of the short straight sections. The and are zero in the LSS. The horizontal betatron tunes is approached from be- low of the resonance 67/3 to the resonance by ramping focusing quadrupole magnets (QFNs) in the arc sections. The horizontal and vertical chromaticities are set to zero by 72 sextupole magnets in 2 families. 8 12 sextupole mag- nets placed in arc sections are used to excite the resonance. These sextupole magnets are classified into two families in order to be able to rotate the separatrix. They does not ex- cite the 0th harmonic component for any current. The beam optics functions at the entrance of the ESS are = 39.0 m, and = 0.001. The ESS wires are positioned so that = 58 mm at the entrance end; the ex- tracted beam is kicked inward by 0.2 mrad. The betatron phase between the ESS and the 1st SM is 245.5 degree, which makes a separation of 3.6 mm between kicked and not kicked particles at the ESS. The arrangement of septa and bump magnets and beam envelopes in the LSS for the slow extraction are shown in Fig. 1.