A brain cooling device is provided to cool the brain sufficiently to the subcortical tissue in a short time. The array has a plurality of sector levels, each sector level containing one sector on each storage device in the array at corresponding addresses across the storage devices. Given a tuned top cladding composition, a width of the waveguide core is pre-selected such that birefringence is minimized, i. Also described is an injection control system for a diesel engine based on the above method.