Journal ArticleDOI
Feedback for physicists: A tutorial essay on control
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TLDR
In this paper, a tutorial essay aims to give enough of the formal elements of control theory to satisfy the experimentalist designing or running a typical physics experiment and enough to satisfy a theorist wishing to understand its broader intellectual context.Abstract:
Feedback and control theory are important ideas that should form part of the education of a physicist but rarely do. This tutorial essay aims to give enough of the formal elements of control theory to satisfy the experimentalist designing or running a typical physics experiment and enough to satisfy the theorist wishing to understand its broader intellectual context. The level is generally simple, although more advanced methods are also introduced. Several types of applications are discussed, as the practical uses of feedback extend far beyond the simple regulation problems where it is most often employed. Sketches are then provided of some of the broader implications and applications of control theory, especially in biology, which are topics of active research.read more
Citations
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Journal ArticleDOI
Feedback based simultaneous correction of imaging artifacts due to geometrical and mechanical cross-talk and tip-sample stick in atomic force microscopy
TL;DR: A feedback scheme that simultaneously corrects, in real time, for the imaging artifacts caused by cantilever and photosensor misalignments as well as misinterpretations in relative lateral position of the tip with respect to the sample due to the tip-sample stick in atomic force microscopy (AFM).
Journal ArticleDOI
Initial development of the DIII–D snowflake divertor control
Egemen Kolemen,P. J. Vail,M. A. Makowski,S.L. Allen,B.D. Bray,M.E. Fenstermacher,D.A. Humphreys,A.W. Hyatt,C.J. Lasnier,A.W. Leonard,Adam McLean,Rajesh Maingi,Raffi Nazikian,T.W. Petrie,Vlad Soukhanovskii,Ezekial A Unterberg +15 more
TL;DR: In this paper, a real-time snowflake detection and control system on DIII-D has been implemented in order to stabilize the configuration, which resulted in a 2.5× reduction in the peak heat flux for many energy confinement times without any adverse effects on core plasma performance.
Journal ArticleDOI
Simple and robust phase-locking of optical cavities with > 200 KHz servo-bandwidth using a piezo-actuated mirror mounted in soft materials.
TL;DR: This work presents an approach to locking of optical cavities with piezoelectric actuated mirrors based on a simple and effective mechanical decoupling of the mirror and actuator from the surrounding mount that shows positive servo gain, and a temporal response to a step interference within 3 μs.
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Inelastic X-ray scattering with 0.75 meV resolution at 25.7 keV using a temperature-gradient analyzer
TL;DR: Temperature-gradient spherical analyzers allow us to improve the resolution of meV-scale inelastic X-ray scattering.
Journal ArticleDOI
Influence of time delay on information exchanges between coupled linear stochastic systems
TL;DR: This work focuses on stationary linear stochastic processes in continuous time and compute the transfer entropy in the presence of delay and correlated noises, using an approximate but numerically effective solution to the relevant Wiener-Hopf factorization problem.
References
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System Identification: Theory for the User
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Journal ArticleDOI
The Structure and Function of Complex Networks
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