AGS/RHIC/SN# 80

Superconducting Helical Snake Magnets:
Construction and Measurements
W. W. MacKay^a, M. Anerella^a, E. Courant^a, J. Escallier^a, W. Fischer^a, G. Ganetis^a, A. Ghosh^a, R. Gupta^d, A. Jain^a, E. Kelly^a, A. Luccio^a, A. Marone^a, G. Morgan^a, J. Muratore^a, M. Okamura^b, V. Ptitsin^a, A. Prodell^a, T. Roser^a, S. Tepikian^a, M. Syphers^c, P. Wanderer^a, and E. Willen^a,

^aBNL, Upton, NY
^bRIKEN, Japan
^cFNAL, Batavia IL
^dLBNL, Berkeley, CA

Abstract: In order to collide polarized protons, the RHIC project will have two snakes in each ring and four rotators around each of two interaction regions. Two snakes on opposite sides of each ring can minimize depolarization during acceleration by keeping the spin tune at a half. Since the spin direction is normally along the vertical direction in a flat ring, spin rotators must be used around an interaction point to have longitudinal polarization in a collider experiment. Each snake or rotator will be composed of four helical dipoles to provide the required rotation of spin with minimal transverse orbit excursions in a compact length of 10m. The basic helical dipole is a superconducting magnet producing a transverse dipole field which is twisted about the magnet axis through in a length of 2.4 m. The design and construction of the magnets is described in this paper.

• Introduction
• Design
• Construction
• Measurements and Discussion
• Acknowledgements
• References
• About this document ...

Postscript version of paper (2.1MB) Presented at the Workshop: Polarized Protons at High Energies-
Accelerator Challenges and Physics Opportunities,
17-20 May 1999
DESY Hamburg, Germany