| Paper |
Title |
Page |
| WEPC050 |
Future Plans for the Advanced Light Source
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2103 |
| |
- D. Robin, H. Nishimura, G. J. Portmann, F. Sannibale, C. Steier
LBNL, Berkeley, California
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The Advanced Light Source is now in its 15th year of operation. The facility has managed to continue to improve through continual upgrades to both the capabilities and capacities. Studies have shown that there is still plenty of room for improvements. Here we present plans to provide sustantial relevant improvements with modest cost.
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| WEPC130 |
Shimming Correction of Dynamic Multipole Effects on Apple-II Type EPUs at the ALS
|
2311 |
| |
- C. Steier, A. Madur, S. Marks, S. Prestemon, T. Scarvie, D. Schlueter, W. Wan
LBNL, Berkeley, California
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Elliptically Polarizing Undulators that provide full photon polarization control also have fast, intrinsic transverse roll-off of the magnetic field. The roll-off is particularly fast for vertical polarization settings, and can have big detrimental effects on the nonlinear single particle dynamics. Particularly low and medium energy light sources and long period EPUs are prone to those effects. The three existing 50mm period EPUs at the ALS have been retrofitted with shims to correct for these dynamic multipole effects and a new 90mm period device which otherwise would have caused a huge reduction in dynamic aperture has been shimmed before installation. Simulations and beam measurements will be presented, including frequency map measurements.
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| THPC033 |
Global Optimization of the Magnetic Lattice Using Genetic Algoritihms
|
3050 |
| |
- D. Robin, F. Sannibale, C. Steier, W. Wan, L. Yang
LBNL, Berkeley, California
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The traditional process of designing and tuning the magnetic lattice of a particle storage ring lattice to produce certain desired properties is not straight forward. Often solutions are found through trial and error and it is not clear that the solutions are close to optimal. In this paper we employ a technique we call GLASS (GLobal scan of All Stable Settings) that allows us to rapidly scan and find all possible stable modes and then characterize their associated properties. In this paper we illustrate how the GLASS technique gives a global and comprehensive vision of the capabilities of the lattice. In a sense, GLASS functions as a lattice observatory clearly displaying all possibilities. The power of the GLASS technique is that it is very fast and comprehensive. There is no fitting involved. It gives the lattice designer clear guidance as to where to look for interesting operational points. We demonstrate the technique by applying it to two existing storage ring lattices - the triple bend achromat of the ALS and the double bend achromat of CAMD. We extend the analysis to more complex lattices using multiobjective evolutionary analysis.
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