| Paper |
Title |
Page |
| MOOAAB01 |
Philosophy for NSLS II Design with Sub-nanometer Horizontal Emittance
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77 |
| |
- S. Ozaki, J. Bengtsson, S. L. Kramer, S. Krinsky, V. Litvinenko
BNL, Upton, Long Island, New York
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In this paper we present design philosophy for reliable light sources with sub-nm horizontal emittance used for conceptual design of NSLS II. We discuss the fundamentals of the concept, such as using reliable achromatic low-emittance lattice with large bending radius and damping wigglers with modest peak field. We also discuss a natural scale of the emittance set by intra-beam scattering and its influence of the choice of the bending radius for the ring. In addition, we review a very weak dependence of the beam lifetime on the emittance, and present a clear physics explanation of the phenomena. Finally, we list main parameters of the 3 GeV NSLS II X-ray ring.
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Slides
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| TUPMS007 |
NSLS VUV Ring Lifetime Study
|
1203 |
| |
- L. Yang, S.-Y. Lee
IUCF, Bloomington, Indiana
- S. L. Kramer, B. Podobedov
BNL, Upton, Long Island, New York
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Beam lifetime at VUV ring of National Synchrotron Light Source(NSLS) at BNL is limited by Touschek effect. This effect is affected by momentum acceptance and beam density. The geometry near injection septum, dynamic aperture and the RF acceptance all can limit the over all momentum acceptance. Extensive experiments including coupling, gas scattering, RF acceptance, have been done for understanding the lifetime, and the result is confirmed with theoretical predictions.
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