We have designed, fabricated and demonstrated a novel micro-system for programmable magnetic actuation using magnetic elliptical pathways on Si substrates. Lithographically patterned soft NiFe ellipses are arranged sequentially perpendicular to each other as stepping stones for the transport of magnetic beads. We have measured the magnetization curve of the ellipsoid (9 µm × 4 µm × 0.1 µm) elements with respect to the long and short axes of the ellipse. We found that the magnetization in the long axis direction is larger than that in the short axis direction for an applied field of ≤ 1,000 Oe, causing a force on carriers that causes them to move from one element to another. We have successfully demonstrated a micro-system for the magnetic actuation of biomolecule carriers of superparamagnetic beads (Dynabead ® 2.8 µm) by rotating the external magnetic field. This novel concept of magnetic actuation is useful for future integrated lab-on-a-chip systems for biomolecule manipulation, separation and analysis.

We have studied the methods for the determination of reference closed orbit of the storage ring in PLS using magnet misalignment data. The reference closed orbit was determined by (1) a smoothing analysis using a lowpass filter method, and (2) a MAD (methodical accelerator design) simulation using the real parameters such as magnet misalignment data. Based on the estimated reference closed orbit, the relative positional errors of the storage ring magnets were evaluated. The results of case studies on the comparison of the smoothing analysis and the MAD simulation are described in this presentation.