Linear and second order optics corrections for the KEK Accelerator Test Facility final focus beam line

被引：11

作者：

Okugi, T. ^{[1
]}

Araki, S. ^{[1
]}

Bambade, P. ^{[2
]}

Kubo, K. ^{[1
]}

Kurado, S. ^{[1
]}

Masuzawa, M. ^{[1
]}

Marin, E. ^{[3
]}

Naito, T. ^{[1
]}

Tauchi, T. ^{[1
]}

Terunuma, N. ^{[1
]}

Tomas, R. ^{[4
]}

Urakawa, J. ^{[1
]}

White, G. ^{[3
]}

Woodley, M.

机构：

[1] High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 3050801, Japan

[2] Univ Paris 11, CNRS, IN2P3, LAL, F-91405 Orsay, France

[3] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[4] CERN, European Org Nucl Res, CH-1211 Geneva, Switzerland

来源：

PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS | 2014年 / 17卷 / 02期

关键词：

SIZE MONITOR; COLLIDERS;

D O I：

10.1103/PhysRevSTAB.17.023501

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

In this paper, the linear and second order optics corrections for the KEK Accelerator Test Facility (ATF2) final focus beam line are described. The beam optics of the ATF2 beam line is designed based on a local chromaticity correction scheme similar to the ILC final focus system. Beam measurements in 2012 revealed skew sextupole field errors that were much larger than expected from magnetic field measurements. The skew sextupole field error was a critical limitation of the beam size at the ATF2 virtual interaction point (IP). Therefore, four skew sextupole magnets were installed to correct the field error in August 2012. By using the four skew sextupole magnets, the predicted tolerances of the skew sextupole field errors of the ATF2 magnets were increased. Furthermore, analyzing field maps of the sextupole magnets identified the source of the skew sextupole field error. After the field error source was removed, the IP vertical beam size could more easily be focused to less than 65 nm.

引用

页数：11

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