Beam based alignment at the KEK accelerator test facility
The KEK Accelerator Test Facility (ATF) damping ring is a prototype low emittance source for the NLC/JLC linear collider. To achieve the goal normalized vertical emittance {gamma}{var_epsilon}{sub {gamma}} = 20 nm-rad, magnet placement accuracy better than 30 mm must be achieved. Accurate beam-based alignment (BBA) is required. The ATF arc optics uses a FOBO cell with two horizontally focusing quadrupoles, two sextupoles and a horizontally defocusing gradient dipole, all of which must be aligned with BBA. BBA at ATF uses the quadrupole and sextupole trim windings to find the trajectory through the center of each magnet. The results can be interpreted to assess the accuracy of the mechanical alignment and the beam position monitor offsets.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director, Office of Science (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 797861
- Report Number(s):
- LBNL-50661; CBP Note - 434; R&D Project: 455101; B& R KA0403011; TRN: US0202046
- Resource Relation:
- Conference: European Particle Accelerator Conference 2002 (EPAC02), Paris (FR), 06/03/2002--06/07/2002; Other Information: PBD: 14 Jun 2002
- Country of Publication:
- United States
- Language:
- English
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Beam-based alignment at the KEK-ATF damping ring
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