Topic
Solenoid
About: Solenoid is a research topic. Over the lifetime, 19278 publications have been published within this topic receiving 114721 citations.
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TL;DR: In this article, it was shown that dc quadrupole field can correct for both types of couplings and exactly cancel their emittance growths, but the degree of cancellation of the rf skew quadrupoles emittance is limited by the electron bunch length.
Abstract: Weak, rotated magnetic and radio frequency quadrupole fields in electron guns and injectors can couple the beam's horizontal with vertical motion, introduce correlations between otherwise orthogonal transverse momenta, and reduce the beam brightness. This paper discusses two important sources of coupled transverse dynamics common to most electron injectors. The first is quadrupole focusing followed by beam rotation in a solenoid, and the second coupling comes from a skewed high-power rf coupler or cavity port which has a rotated rf quadrupole field. It is shown that a dc quadrupole field can correct for both types of couplings and exactly cancel their emittance growths. The degree of cancellation of the rf skew quadrupole emittance is limited by the electron bunch length. Analytic expressions are derived and compared with emittance simulations and measurements.
27 citations
Patent•
15 Oct 1990TL;DR: In this paper, the dynamic range of an EFI was extended by means of a second solenoid coil that controlled the position of a stop for the reciprocating armature that was operated by the usual solenoids coil.
Abstract: The dynamic range of an electromagnetic fuel injector is extended by means of a second solenoid coil that controls the position of a stop for the reciprocating armature that is operated by the usual solenoid coil.
27 citations
TL;DR: This brief presents an electric model of an on/off solenoid valve used to regulate brake pressure in anti-lock braking control systems (ABS) derived with the purpose to test and validate some coil driver integrated circuits in a Hardware-in-the-loop approach.
Abstract: This brief presents an electric model of an on/off solenoid valve used to regulate brake pressure in anti-lock braking control systems (ABS). The model has been derived with the purpose to test and validate some coil driver integrated circuits in a Hardware-in-the-loop approach. The valve model is composed by magneto-dynamic, mechanical and fluid dynamic subsystems. The global system is highly nonlinear and presents hysteresis phenomena due to the ferromagnetic effect. A non-integer order system has been adopted to simply represent the high order dynamics present into the system, while Duhem equations coupled with two different neural networks are used to model the hysteresis. Several experimental trials have been performed in order to validate the suitability of the proposed approach.
27 citations