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- Ka Yi Ng
- 1995

We prove that for each positive integer n, the V n-equivalence classes of ribbon knot types form a subgroup R n , of index two, of the free abelian group V n constructed by the author and Stanford. As a corollary , any non-ribbon knot whose Arf invariant is trivial cannot be distinguished from ribbon knots by finitely many independent Vassiliev invariants.… (More)

The third-integer coupling resonance at ν(x)-2ν(z)=ℓ, known as the Walkinshaw resonance, is important in high-power accelerators. We find that, when the betatron tunes ramp through a Walkinshaw resonance the fractional emittance growth (FEG) is a universal function of the effective resonance strength: G(1,-2,ℓ)√[ε(xi)]|Δ(ν(x)-2ν(z))/Δn|(-1/2), where… (More)

- K. Y. Ng
- 2010

Sections 3.2.4 and 3.2.5 of the Handbook of Accelerator Physics and Engineering on Landau damping are combined and updated. The new addition includes impedances and wakes for multi-layer beam pipe, optical model, diffraction model, and cross-sectional transition.

- M. A. Furman, K. Y. Ng
- 1988

We consider a simple model to study the effects of the beam-beam force on the dynamics of colliding beams. We focus on the quadrupole modes of the coherent oscillation. The ingredients are: (1) linearized beam-beam kicks, (2) damping and noise due to synchrotron radiation, and (3) linear transport between beam-beam kicks. The dynamical variables are the… (More)

- D Trbojevic, K Y Ng, E D Courant, S Y Lee, C Johnstone, J Gallardo +2 others
- 2007

The muon collider would extend limitations of the e + e ? colliders and provide new physics potentials with a possible discovery of the heavy Higgs bosons. At the maximum energy of 2 TeV the projected luminosity is of the order of 10 35 cm ?2 s ?1. The colliding + ? bunches have to be focused to a very small transverse size of 2.8 m which is accomplished by… (More)

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