Since its inception, the National Synchrotron Light Source has been a center for the development of new magnets for the production of synchrotron radiation. Following a brief description of the NSLS facility, three innovative magnets will be discussed: a permanent magnet assisted, electromagnet sextupole, a superconducting wiggler magnet, and an extremely short-period, small-gap undulator. The sextupole, developed to enhance the performance of the low-emittance lattice4 in the NSLS X-Ray Storage Ring, uses rare earth - transition metal magnets to reduce the field in the iron yoke of the sextupole, thereby decreasing saturation of the iron and increasing the pole tip field by 20% at the maximum current. The superconducting wiggler, designed to produce hard x-rays in the 2.8 GeV X-Ray Ring, has three modes of operation: 11 poles at 3.3 T, 5 poles at 4.7 T, and 1 pole at 5.5 T (with, in each case, an additional half-strength pole at each end). Finally, the undulator was designed to produce x-rays with a spectrum from 1.76 – 20 KeV from the 2.8 GeV electron beam. The undulator is a hybrid structure, using vanadium permandur poles and NdFeB permanent magnets. It has a 12.5 mm period and operates in the accelerator vacuum with a minimum gap of only 2 mm. It is the latest in a series of small-gap undulators developed at the NSLS to produce hard x-rays from a relatively low-energy electron storage ring.


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