each block or section application_number US 46566490 A description the following detailed description is of the best presently contemplated mode of carrying out the invention this description is not to be taken in a limiting sense but is made merely for the purpose of illustrating the general principles of the invention the scope of the invention is best defined by the appended claims the following description relates to spacer bar devices and a coil structure such as a superconducting magnetic energy storage coil which includes such spacer bar devices however it will be recognized that the present spacer bar device may be employed in any coil system in which coil layers are spaced apart from each other according to an embodiment of the present invention in order to allow separated coil layers to react electromagnetic loads against each other several axially arranged insulated spacer bars are provided between each pair of adjacent coil layers about the circumference of the coil structure a general layout of a portion of a coil structure and spacer bars according to an embodiment of the present invention is shown in fig1 in fig1 portions of four coil winding layers 10 12 14 and 16 respectively are shown as being held by clamping devices 18 20 22 24 and 26 in a mutually separated relationship as shown each coil layer 10 12 14 and 16 is composed of.