5,238 research outputs found
Two-Stream Instability Model With Electrons Trapped in Quadrupoles
We formulate the theory of the two-stream instability (e-cloud instability)
with electrons trapped in quadrupole magnets. We show that a linear instability
theory can be sensibly formulated and analyzed. The growth rates are
considerably smaller than the linear growth rates for the two-stream
instability in drift spaces and are close to those actually observed
A study of energy release in rocket propellants by a projectile impact method Final report
Rate of energy release in solid rocket propellants determined by square shock waves produced by projectile impac
Van Hove Singularities and Excited-State Quantum Phase Transitions in Graphene-like Microwave Billiards
We discuss solutions of an algebraic model of the hexagonal lattice
vibrations, which point out interesting localization properties of the
eigenstates at van Hove singularities (vHs), whose energies correspond to
Excited-State Quantum Phase Transitions (ESQPT). We show that these states form
stripes oriented parallel to the zig-zag direction of the lattice, similar to
the well-known edge states found at the Dirac point, however the vHs-stripes
appear in the bulk. We interpret the states as lines of cell-tilting
vibrations, and inspect their stability in the large lattice-size limit. The
model can be experimentally realized by superconducting 2D microwave resonators
containing triangular lattices of metallic cylinders, which simulate
finite-sized graphene flakes. Thus we can assume that the effects discussed
here could be experimentally observed.Comment: 3 pages, 2 figures, to appear in AIP Conference Proceedings,
SYMMETRIES AND ORDER: ALGEBRAIC METHODS IN MANY BODY SYSTEMS, In honor of
Professor Francesco Iachello on the occasion of his retirement, October 5-6,
2018 at Yale Universit
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