Mechanical Design of Isabelle Magnet Cryostats

It has been proposed to construct an intersecting storage ring accelerator, ISABELLE, at BNL, consisting of two concentric rings of magnets containing counter-rotating beams of charged particles. Each ring contains 216 dipole magnets and 138 quadrupoles. All magnets are superconducting and operate at a temperature of 4.3 K. A description of the design of the cryostats, including the internal supports, heat shield superinsulation system and the vacuum vessel is given. Details of fabrication techniques are also included.