Beam based alignment at the KEK accelerator test facility

Conference · Fri Jun 14 04:00:00 EDT 2002

OSTI ID:797861

Ross, M ^[1]; Nelson, J; Woodley, M; Wolski, A

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1. LBNL Library

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: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director, Office of Science (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 797861
• Report Number(s): LBNL--50661; CBP Note - 434; B& R KA0403011
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ACCURACY
ALIGNMENT
BEAM POSITION
DAMPING
FOCUSING
LINEAR COLLIDERS
MAGNETS
MONITORS
OPTICS
QUADRUPOLES