A superconducting quadrupole magnet array for a heavy ion fusion driver

A multi-channel quadrupole array has been proposed to increase beam intensi ty and reduce space charge effects in a Heavy Ion Fusion Driver. A single a rray unit composed of several quadrupole magnets, each with its own beam li ne, will be placed within a ferromagnetic accelerating core whose cost is d irectly affected by the array size. A large number of focusing arrays will be needed along the accelerating path. The use of a superconducting quadrup ole magnet array will increase the field and reduce overall cost. We report here on the design of a compact 3x3 superconducting quadrupole ma gnet array. The overall array diameter and length including the cryostat is 900x700 mm. Each of the 9 quadrupole magnets has a 79 mm warm bore and an operating gradient of 50 T/m over an effective magnetic length of 320 mm.