Brittle behavior of SSC yokes

In liquid helium at 4 K ultra--low carbon steel is known to be brittle. Fracture toughness and ultimate strength measured by the National Institute of Standards and Technology (NIST) are used here to examine the brittle behavior of the SSC yokes. The fracture toughness K{sub Ic} of the material is used to estimate the maximum allowable length of pre--existing cracks. Tensile properties of the steel at 4 K are compared with maximum tensile stresses obtained from the ANSYS finite element analysis of the DSX201 cross--section. 5 refs., 3 figs., 4 tabs

Mechanical design and analysis of the 2D cross-section of the SSC collider dipole magnet

The 50 mm aperture collider dipole magnet uses stainless steel collars to position the conductors at the locations specified by the magnetic design and to prestress the coil to prevent conductor motion under excitation. The collars are supported by the vertically-split yoke and cold mass skin to reduce their deflection under excitation. The collar interior is designed to give the coil its required shape at the operating temperature taking into account all deflections that occur from assembly and cooldown. 13 refs., 2 figs., 1 tab