ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
Multipole and phase tuning of insertion devices is important for maintaining beam dynamics and reaching the high brightness goals of the Advanced Photon Source. Several general approaches are described: mechanical adjustments, end-pole shaping, and magnetic shimming. Off-axis Hall probe measurements after assembly guide magnet exchanges and local mechanical adjustments. A recent development has been the use of potential theory applied to end-pole shaping. The wide gap tuning range of the APS devices requires careful matching of device errors and correct gap dependencies in the gap/period range of 0.18 to 0.6. Shims are especially sensitive at small gaps. We describe signatures, gap dependencies, algorithms, modeling, and experimental results for these techniques. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1147054
