Linear and second order optics corrections for the KEK Accelerator Test Facility final focus beam line - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physical Review Special Topics: Accelerators and Beams Year : 2014

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

T. Okugi
  • Function : Author
KEK
S. Araki
  • Function : Author
KEK
P. Bambade
  • Function : Author
ILC
K. Kubo
  • Function : Author
KEK
S. Kurado
  • Function : Author
KEK
M. Masuzawa
  • Function : Author
KEK
T. Naito
  • Function : Author
KEK
T. Tauchi
  • Function : Author
KEK
N. Terunuma
  • Function : Author
KEK
J. Urakawa
  • Function : Author
KEK

Abstract

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.

Dates and versions

in2p3-00954525 , version 1 (03-03-2014)

Identifiers

Cite

T. Okugi, S. Araki, P. Bambade, K. Kubo, S. Kurado, et al.. Linear and second order optics corrections for the KEK Accelerator Test Facility final focus beam line. Physical Review Special Topics: Accelerators and Beams, 2014, 17, pp.023501. ⟨10.1103/PhysRevSTAB.17.023501⟩. ⟨in2p3-00954525⟩
24 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More