Improvements to the Aladdin synchrotron light source

Abstract

Aladdin is an IR to soft x-ray synchrotron light source operated by the University of Wisconsin at Madison. As part of the ongoing program of upgrades and improvements, several changes have recently been made to the ring. It had previously been determined that physical apertures (BPMs) at the QF quadrupoles were limiting beam lifetime when the ring was operated in its low emittance configuration. Increasing the size of these apertures has resulted in a significant increase in lifetime. Also as part of the aperture opening process, a number of ring components were redesigned and replaced, lowering the ring impedance. This has led to an increase in the threshold beam current for microwave instability. An insertion device for EUV lithography has been incorporated into one of the Aladdin short straight sections, and an elliptically polarizing undulator will be installed in another short straight section for a new VLS- PGM beamline. An innovative infrared beamline is under construction, which will extract 320 (H) times 25 (V) mrad <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> from a bending magnet by as 12 beamlets, which are combined in an IR microscope. Another modification to Aladdin was the design and installation of discrete trim coils on the quadrupole pole-tips to facilitate using the quads as steering correctors. Details of these improvements are presented.