A micro-fabrication compatible wiggler design scalable to sub-millimeter periods

Summary Form only given, as follows. An ultrashort linear wiggler design has been developed that is compatible with microfabrication techniques and is capable of producing uniform, multikilogauss fields at millimeter and submillimeter periods. The design evolved from a prototype wiggler that consists of a multiply counterwrapped copper winding around a series of iron pole pieces. The counterwrapping produces a number of benefits, including reduction of end effects, elimination of edge asymmetries, current multiplication, and elimination of stray fields and excessive inductance from long, unshielded current supply leads. This wiggler has good uniformity and gives excellent agreement with calculations using the two-dimensional finite-difference code POISSON. It was found that even better intrinsic uniformity (<0.2% based on code calculations) could be obtained by putting a large iron bus along the top of the wiggler. By scaling down all dimensions proportionately to the ratio of the lengths and reducing the current by a like amount, it is possible to attain fields in the small wiggler that are the same as those attainable in the larger-period wiggler. On the other hand, the power density scales unfavorably, increasing as the inverse square of the scaling factor. Cooling may be required for CW operation. This can easily be provided due to the wiggler´s small size and its construction geometry.<>