1. Lossless crossing of a resonance stopband during tune modulation by synchrotron oscillations
- Author
-
G M Wang, Yongjun Li, Richard H. Rand, Victor Smaluk, and Timur Shaftan
- Subjects
Physics ,010308 nuclear & particles physics ,business.industry ,General Physics and Astronomy ,Resonance ,Stopband ,Betatron ,01 natural sciences ,Synchrotron ,law.invention ,Dynamic aperture ,Optics ,law ,Modulation ,0103 physical sciences ,Physics::Accelerator Physics ,Beam emittance ,010306 general physics ,business ,Beam (structure) - Abstract
Modern high performance circular accelerators require sophisticated corrections of nonlinear lattices. The beam betatron tune footprint may cross many resonances, reducing dynamic aperture and causing particle loss. However, if particles cross a resonance reasonably fast, the beam deterioration may be minimized. This paper describes the experiments with the beam passing through a half-integer resonance stopband via tune modulation by exciting synchrotron oscillations. This is the first time that beam dynamics have been kept under precise control while the beam crosses a half-integer resonance. Our results convincingly demonstrate that particles can cross the half-integer resonance without being lost if the passage is reasonably fast and the resonance stopband is sufficiently narrow.
- Published
- 2017