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| THPMS038 |
Magnetic Measurements and Simulations of a 4-Magnet Dipole Chicane for the International Linear Collider
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3085 |
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- R. Arnold
- V. N. Duginov, S. A. Kostromin, N. A. Morozov
JINR, Dubna, Moscow Region
- A. Fisher, C. Hast, Z. Szalata, M. Woods
SLAC, Menlo Park, California
- H. J. Schreiber, M. Viti
DESY Zeuthen, Zeuthen
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T-474 at SLAC is a prototype BPM-based energy spectrometer for the ILC. We describe magnetic measurements and simulations for the 4-magnet chicane used in T-474. The ILC physics program requires better than 100 part-per-million (ppm) accuracy for energy measurements, which necessitates better than 50 ppm accuracy for magnetic field integral measurements. A 4-dipole chicane is used in T-474 with mid-chicane dispersion of 5-mm and magnetic fields of ~1 kGauss; similar to the current ILC parameters. Stability, reproducibility and consistency of magnetic measurements, including magnetic field maps for the T-474 dipole magnets, are presented using a moving wire, rotating coil, NMR probe, Hall probe and low-field fluxgate magnetometer. Measurements from SLAC's Magnet Test Lab facility as well as in situ measurements in End Station A (ESA) are presented, including measurements of residual magnetic fields in the T-474 chicane between the chicane magnets. Results are provided for an operational mode with a 1-hour calibration cycle, where the chicane magnets are operated in both polarities and at near-zero field.
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