在加速器测试设施阻尼环中实现超低发射度束流。

Achievement of ultralow emittance beam in the accelerator test facility damping ring.

作者信息

Honda Y, Kubo K, Anderson S, Araki S, Bane K, Brachmann A, Frisch J, Fukuda M, Hasegawa K, Hayano H, Hendrickson L, Higashi Y, Higo T, Hirano K, Hirose T, Iida K, Imai T, Inoue Y, Karataev P, Kuriki M, Kuroda R, Kuroda S, Luo X, McCormick D, Matsuda M, Muto T, Nakajima K, Naito Takashi, Nelson J, Nomura M, Ohashi A, Omori T, Okugi T, Ross M, Sakai H, Sakai I, Sasao N, Smith S, Suzuki Toshikazu, Takano M, Taniguchi T, Terunuma N, Turner J, Toge N, Urakawa J, Vogel V, Woodley M, Wolski A, Yamazaki I, Yamazaki Yoshio, Yocky G, Young A, Zimmermann F

机构信息

Department of Physics, Kyoto University, Kyoto, Japan.

出版信息

Phys Rev Lett. 2004 Feb 6;92(5):054802. doi: 10.1103/PhysRevLett.92.054802.

DOI:10.1103/PhysRevLett.92.054802

PMID:14995314

Abstract

For high luminosity in electron-positron linear colliders, it is essential to generate low vertical emittance beams. We report on the smallest vertical emittance achieved in single-bunch-mode operation of the Accelerator Test Facility, which satisfies the requirement of the x-band linear collider. The emittances were measured with a laser-wire beam-profile monitor installed in the damping ring. The bunch length and the momentum spread of the beam were also recorded under the same conditions. The smallest vertical rms emittance measured at low intensity is 4 pm at a beam energy of 1.3 GeV, which corresponds to the normalized emittance of 1.0x1.0(-8) m. It increases by a factor of 1.5 for a bunch intensity of 10(10) electrons. The measured data agreed to the calculation of intrabeam scattering within much better than a factor of 2.

摘要

对于电子 - 正电子直线对撞机的高亮度而言，产生低垂直发射度的束流至关重要。我们报告了在加速器测试设施单束团模式运行中实现的最小垂直发射度，其满足了X波段直线对撞机的要求。发射度是通过安装在阻尼环中的激光线束轮廓监测器测量的。在相同条件下还记录了束团长度和束流的动量分散。在低强度下测量的最小垂直均方根发射度在束流能量为1.3 GeV时为4皮米，这对应于归一化发射度为1.0×10⁻⁸米。对于束团强度为10¹⁰个电子，它增加了1.5倍。测量数据与束内散射的计算结果相符程度远优于2倍。