Various effects occur which can prevent attainment of the high Q’s and/or the high gradient fields necessary for the operation of rf superconducting cavities. One of these effects, multipactor, both causes the cav-ty _to de&me during filling due to resonant secondary electron emission at the cavity walls, and lowers the Q by dissipative processes. TiN deposited onto the high field regions of ro...

In the context of the ESA Program AO 4025 Surface Treatment and Coating, we have developed a simulator called MEST for the prediction of the multipactor effect. The simulator has been developed using a micro level object-oriented approach, where each electron in the simulation is an independent object. This approach differs from other models described in the literature, which are macro level or...

Proving a conjecture of Talagrand, fractional version the ``expectation-threshold" Kalai and second author, we show that $p_c (\mathcal{F}) = O(q_f(\mathcal{F})\mathrm{log}\ \ell(\mathcal{F}))$ for any increasing family $\mathcal{F}$ on finite set $X$, where $p_c(\mathcal{F})$ $q_f(\mathcal{F})$ are threshold ``fractional expectation-threshold" $\mathcal{F}$, $\ell(\mathcal{F})$ is maximum size...

We investigated the trade-off between capacity and precision in visual working memory with two different tasks: delayed discrimination and recall. The stimuli were radial frequency patterns that require global pooling of local visual features. The thresholds in delayed amplitude discrimination were measured with a two-interval, forced-choice setup using the Quest procedure. In the recall experi...

The special code has been developed for numerical simulation of the multipactor discharge during long-time INR activity in the development and construction of accelerating structures. The code simulates the secondary emission electron trajectories at different levels of rf field using real electromagnetic field distribution (calculated with modern 2D or 3D software) in the cavity that has a com...

We have developed an integrated software system, TrakRF, to model electromagnetic fields and charged particle orbits in high-power RF devices. Our primary application is simulation of electron multipactoring near RF vacuum windows for the APT (Accelerator Production of Tritium) Program. In this paper we describe features of the codes and initial multipactor calculations for superconducting cavi...