The SNS accumulator ring will have a high intensity (~ 10) low energy (1 GeV) beam and required uncontrolled particle loss rates of ~ one part in 10. For these beam parameters, space charge effects could drive beam halo growth, which would lead to violation of the stringent loss criterion. In this paper we investigate the transverse halo growth due to space charge using a newly developed simula...

In this paper we present an analytical model for charge injection in MOS switches that is valid for all regions of operation. The model is general and can be applied for different load conditions. We analyze and develop two separate charge injection models for the different operating conditions. A simple continuos model that is valid for all conditions is then stitched together using appropriat...

Space charge lenses for ion beam focussing are in theory, especially for singly charged heavy ion beams at low velocities, superior to other lens systems [1]. On the other hand previous experiments [2] have shown, in contrary to the theoretical forecast, a small degree of lens filling and serious emittance growth. Newer experiments [3] demonstrated a much better degree of lens filling and subst...

networks,” J. Franklin Inst., vol. 296, no. 2, pp. 91-114, Aug. 1973. [3] L. 0. Chua and G.-N. Lin, “Nonlinear programming without computation,” IEEE Trans. Circuits Syst., vol. CAS-31, pp. 182-188, Feb. 1984. [4] L. 0. Chua and G.-N. Lin, “Errata to ‘Nonlinear programming without computation’,” IEEE Trans. Circuits Syst., vol. CAS-32, p. 736, July 1985. [5] L. 0. Chua, “Device modeling via non...

Charge Injection Devices (CIDs) have historically played a niche role in visible imager technologies, mainly for applications requiring high radiation tolerance. They have not exhibited the radiometric performance of competing visibleimaging technologies such as CCDs, and so have not been widely applied to space instrument systems. Recent advances in CIDs have demonstrated much higher radiometr...

Charge trapping and the generation of interface traps in thermally grown Si02 and its interface with silicon, produced by Fowler-Nordheim tunneling injection at low temperatures from highly doped Si substrates, have been investigated. The results that can be obtained with the constant-current-injection method, when a moderate amount of charge is trapped inside the potential barrier, have been a...

Electrode materials and geometry play a crucial role in the charge injection efficiency in organic transistors. Reduced graphene oxide (RGO) electrodes show good compatibility with an organic semiconductor from the standpoint of energy levels and ordered growth of the organic semiconductor, both of which are favourable for charge injection. However, the wide electrode edge (>10 nm) in commonly-...

Previous investigations at NSWC, Dahlgren Laboratory, have established that anomalous voltage decay curves are observed for capacitors filled with cooled ethylene glycolwater dielectric mixtures. A unipolar charge injection model developed in conjunction with M. Zahn, et a!, at MIT correctly predicted experimental waveforms and yielded information on the quantity of charge injection and the mob...

A bipolar charge transport model is employed to investigate the remarkable reduction in dc conductivity of low-density polyethylene (LDPE) based material filled with uncoated nanofillers (reported in the first part of this work). The effect of temperature on charge transport is considered and the model outcomes are compared with measured conduction currents. The simulations reveal that the cont...

A computer model to simulate the processes of charge injection and migration through DNA after irradiation by a heavy charged particle was developed. The most probable sites of charge injection were obtained by merging spatial models of short DNA sequence and a single 1 GeV/u iron particle track simulated by the code RITRACKS (Relativistic Ion Tracks). Charge migration was simulated by using a ...