A negative ion source for the Neutral Beam Injection (NBI) system of China Fusion Engineering Test Reactor (CFETR) is under development in Southwestern Institute Physics. The aim to extract an H– beam 20 a pulse duration 3600 s at energy 200 keV. In this work, optics investigated with single beamlet model COMSOL environment. effects varying main electromagnetic parameters are studied. boundary ...

We present a comparison of two low-noise carrier-envelope offset (CEO) frequency stabilization methods studied using an ytterbium (Yb) fiber laser oscillator based on nonlinear amplifying loop mirror. first investigate the phase locking performance achieved with cross-gain modulation (XGM) via injection auxiliary low-power continuous-wave (CW) into gain medium. Amplification injected CW light c...

We develop, analyze, and test a training algorithm for support vector machine classifiers without offset. Key features of this algorithm are a new, statistically motivated stopping criterion, new warm start options, and a set of inexpensive working set selection strategies that significantly reduce the number of iterations. For these working set strategies, we establish convergence rates that, ...

Excessive vaccine wastage and safety concerns have prompted the international health community to develop and supply vaccines in formats other than the standard multi-dose vial. This article presents a programmatic and economic comparison of the major differences between the multi-dose vials and single-dose formats used for immunization services in developing countries. Multi-dose vials, in gen...

Hydraulic fracturing of deep shale beds to develop natural gas has caused concern regarding the potential for various forms of water pollution. Two potential pathways-advective transport through bulk media and preferential flow through fractures-could allow the transport of contaminants from the fractured shale to aquifers. There is substantial geologic evidence that natural vertical flow drive...

The sensorless model predictive force control (SMPFC) is a strong method for controlling the drives of three-phase 4(6)-switch inverter linear induction motors. This kind of inverter can be employed for fault tolerant control in order to solve the problem of open/short circuit in 6-switch inverters (B6). This paper proposed a method for the SMPFC of a linear induction motor (LIM) with a 4-switc...