336,481 research outputs found
Microbunched Electron Cooling with Amplification Cascades
The Microbunched Electron Cooling (MBEC) is a promising cooling technique
that can find applications in future hadron and electron-ion colliders to
counteract intrabeam scattering that limits the maximum achievable luminosity
of the collider. To minimize the cooling time, one would use amplification
cascades consisting of a drift section followed by a magnetic chicane. In this
paper, we first derive and optimize the gain factor in an amplification section
for a simplified one-dimensional model of the beam. We then deduce the cooling
rate of a system with one and two amplification cascades. We also analyze the
noise effects that counteract the cooling process through the energy diffusion
in the hadron beam. Our analytical formulas are confirmed by numerical
simulations for a set of model parameters.Comment: arXiv admin note: text overlap with arXiv:1806.0278
Performance Studies of Bulk Micromegas of Different Design Parameters
The present work involves the comparison of various bulk Micromegas detectors
having different design parameters. Six detectors with amplification gaps of
and mesh hole pitch of were tested at room temperature and normal gas pressure. Two
setups were built to evaluate the effect of the variation of the amplification
gap and mesh hole pitch on different detector characteristics. The gain, energy
resolution and electron transmission of these Micromegas detectors were
measured in Argon-Isobutane (90:10) gas mixture while the measurements of the
ion backflow were carried out in P10 gas. These measured characteristics have
been compared in detail to the numerical simulations using the Garfield
framework that combines packages such as neBEM, Magboltz and Heed.Comment: arXiv admin note: text overlap with arXiv:1605.0289
Noiseless amplification of weak coherent fields without external energy
According to the fundamental laws of quantum optics, noise is necessarily
added to the system when one tries to clone or amplify a quantum state.
However, it has recently been shown that the quantum noise related to the
operation of a linear phase-insensitive amplifier can be avoided when the
requirement of a deterministic operation is relaxed. Nondeterministic noiseless
linear amplifiers are therefore realizable. Usually nondeterministic amplifiers
rely on using single photon sources. We have, in contrast, recently proposed an
amplification scheme in which no external energy is added to the signal, but
the energy required to amplify the signal originates from the stochastic
fluctuations in the field itself. Applying our amplification scheme, we examine
the amplifier gain and the success rate as well as the properties of the output
states after successful and failed amplification processes. We also optimize
the setup to find the maximum success rates in terms of the reflectivities of
the beam splitters used in the setup. In addition, we discuss the nonidealities
related to the operation of our setup and the relation of our setup with the
previous setups.Comment: arXiv admin note: substantial text overlap with arXiv:1309.428
- …