Half-length model of a Siberian snake magnet for RHIC

For the Relativistic Heavy ion Collider (RHIC) Spin Project, super-conducti ng helical dipole magnets are being constructed. These magnets will be used in 'Siberian Snakes' and 'Spin Rotators', which manipulate spin direction of proton beams in RHIC. The dipole field in these magnets rotates 360 degr ees and is required to reach a magnetic field strength of more than 4.0 T. The bore radius of the coils and the magnetic length of the magnets are 50 and 7400 mm, respectively. To ascertain the performance of these magnets, w hich are built using a new "coil in a slot" technique, a half-length model has been fabricated and tested. The quench performance, field uniformity an d rotation angle have been investigated. The measured values in the model m agnet agreed well with field calculations. These results demonstrate the ad equacy of the fabrication method adopted in the model magnet. (C) 2000 Else vier Science B.V. All rights reserved.