Evaluation of extremely small horizontal emittance
Evaluation of extremely small horizontal emittance
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极小水平发射度的评估
DOI：
10.1103/physrevstab.2.022801
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发表时间：
1999
影响因子：
--
通讯作者：
J. Corlett
中科院分区：
文献类型：
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作者：
T. Okugi;T. Hirose;H. Hayano;S. Kamada;K. Kubo;T. Naito;K. Oide;K. Takata;S. Takeda;N. Terunuma;N. Toge;J. Urakawa;S. Kashiwagi;M. Takano;D. McCormick;M. Minty;M. Ross;M. Woodley;F. Zimmermann;J. Corlett
KEK加速器试验设施（KEK-ATF）的建造是为了开发产生未来直线对撞机所需的低发射度光束的技术。KEK-ATF由注入器直线加速器、阻尼环和束流引出线组成。阻尼环的基本光学结构是FOBO晶格，它减少了弯曲磁体中心的水平色散，因此可以产生极小的发射束。为了验证这种独特的低发射度晶格的性能，测量水平发射度至关重要。水平发射度的测量使用线扫描仪在光束提取线。由于水平束流位置不稳定，我们建立了一种方法来校正测量的束流尺寸的位置波动（"抖动“），我们成功地观察到迄今为止最小的水平发射度在任何加速器。在束流能量为1.285 GeV，束团数为$\（3\char21{}5\）\ifmmode\times\else\texttimes\fi {}{10}^{9}$时，测得的水平发射度为1.37\ifmmode\pm\else\textpm\fi{}0.03\mathrm{nm}$，与设计值1.27\char21{}1.34 nm一致。
The KEK Accelerator Test Facility (KEK-ATF) was constructed to develop technologies for producing a low-emittance beam which will be required by future linear colliders. The KEK-ATF consists of an injector linac, a damping ring, and a beam extraction line. The basic optical structure of the damping ring is a FOBO lattice, which reduces the horizontal dispersion at the center of the bending magnets and, as a consequence, can produce an extremely small emittance beam. To verify the performance of such a unique, low-emittance lattice, it is crucial to measure the horizontal emittance. The horizontal emittance was measured using wire scanners in the beam extraction line. Since the horizontal beam position was not stable, we established a method to correct the measured beam size for position fluctuation (``jitter'') and we succeeded in the observation of the so far smallest horizontal emittance in any accelerator. The measured horizontal emittance was $1.37\ifmmode\pm\else\textpm\fi{}0.03\mathrm{nm}$ at a beam energy of 1.285 GeV and a bunch population of $\(3\char21{}5\)\ifmmode\times\else\texttimes\fi{}{10}^{9}$, in agreement with the design value of 1.27\char21{}1.34 nm at the beam energy and the bunch population.