Achievement of ultralow emittance beam in the accelerator test facility damping ring.
Achievement of ultralow emittance beam in the accelerator test facility damping ring.
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在加速器试验装置阻尼环中实现超低发射束。
DOI：
10.1103/physrevlett.92.054802
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发表时间：
2004
影响因子：
8.6
通讯作者：
F. Zimmermann
中科院分区：
文献类型：
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作者：
Y. Honda;Kiyoshi Kubo;Scott L. Anderson;S. Araki;K. Bane;A. Brachmann;J. Frisch;M. Fukuda;K. Hasegawa;H. Hayano;L. Hendrickson;Y. Higashi;T. Higo;K. Hirano;T. Hirose;K. Iida;T. Imai;Youichi Inoue;P. Karataev;M. Kuriki;Ryunosuke Kuroda;S. Kuroda;X. Luo;D. McCormick;M. Matsuda;T. Muto;K. Nakajima;T. Naito;J. Nelson;M. Nomura;A. Ohashi;T. Omori;T. Okugi;M. Ross;H. Sakai;I. Sakai;N. Sasao;S. Smith;Toshikazu Suzuki;M. Takano;T. Taniguchi;N. Terunuma;J. Turner;N. Toge;J. Urakawa;V. Vogel;M. Woodley;Andrzej Wolski;I. Yamazaki;Y. Yamazaki;G. Yocky;Andrew Young;F. Zimmermann
为了实现高亮度的正电子直线对撞机，必须产生低垂直发射度的光束。我们报道了加速器测试装置在单束模式下实现的最小垂直发射度，满足x波段直线对撞机的要求。利用安装在阻尼环上的激光线光束轮廓监测仪测量了发射率。在相同的条件下，还记录了束长和光束的动量扩散。在低强度下，当束流能量为1.3 GeV时，测量到的垂直平均发射度最小为4 pm，对应的归一化发射度为1.0 × 1.0(-8) m。当束束强度为10（10）个电子时，垂直平均发射度增加1.5倍。实测数据与波束内散射计算结果的吻合程度在2倍以上。
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.