Beam Based Alignment at the KEK Accelerator Test Facility

Technical Report · Wed Jul 03 04:00:00 EDT 2002

DOI:https://doi.org/10.2172/799935· OSTI ID:799935

Ross, Marc C ^[1]

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1. SLAC

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 y} = 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: Stanford Linear Accelerator Center, Menlo Park, CA (US)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 799935
• Report Number(s): SLAC-PUB-9239
• 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