Generation and Acceleration of Low-Emittance, High-Current Electron Beams for SuperKEKB
Generation and Acceleration of Low-Emittance, High-Current Electron Beams for SuperKEKB
复制标题
SuperKEKB 低发射高电流电子束的生成和加速
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Xiangyu Zhou
中科院分区：
文献类型：
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作者：
M.Yoshida;N. Iida;S.Kazama;T.Natsui;Y.Ogawa;S. Ohsawa;L. Zang;Xiangyu Zhou
KEK e-/e+直线加速器目前正处于SuperKEKB升级的最后阶段。关键问题之一是稳定地产生和加速用于SuperKEKB的低发射度、高电荷电子束（具有5 nC电荷和20 mm-mrad归一化发射度的单聚束束对）。由于环的小动态孔径和短寿命，SuperKEKB注射需要如图2所示的注射器升级。聚束电荷必须增加到KEKB的5倍以上，并且需要约20 mm mrad的较低归一化发射度。此外，在较高束团电荷的条件下，SuperKEKB的HER的同步加速器注入需要约0.1%的小能量扩展。表一：SuperKEKB所需参数KEKB（e/e）SuperKEKB（e/e）Beam Energy 3.5 / 8.0 GeV 4.0 / 7.0 GeV Bumch Charge 1.0 / 1.0 nC 4.0 / 5.0 nC归一化横向发射度（1）2100 / 300 mmmrad 6 / 20 mm mrad能量扩展0.1% 0.1%
KEK e-/e+ linac is now in a final stage of upgrade for SuperKEKB. One of the key issues is to stably generate and accelerate a low-emittance, high charge electron beam for SuperKEKB (a couple of single-bunched beams with a charge of 5 nC and a normalized emittance of 20 mm-mrad each). REQUIREMENTS The injector upgrade as shown in Fig. 2 is required for the SuperKEKB injection due to the small dynamic aperture and the short life time of the ring. The bunch charge must increase up to 5 times higher than KEKB and the lower normalized emittance is required around 20 mm mrad. Further the small energy spread of around 0.1 % is required in the condition of higher bunch charge for the synchrotron injection of the HER of the SuperKEKB. Table 1: Required Parameters for SuperKEKB KEKB(e/e) SuperKEKB(e/e) Beam Energy 3.5 / 8.0 GeV 4.0 / 7.0 GeV Bumch Charge 1.0 / 1.0 nC 4.0 / 5.0 nC Normalized transverse Emittance (1) 2100 / 300 mmmrad 6 / 20 mm mrad Energy Spread 0.1 % 0.1 %