Bibliographies thématiques / Resistive wall impedance

Littérature scientifique sur le sujet « Resistive wall impedance »

Auteur : Grafiati
Publié le 11 mars 2023

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Articles de revues sur le sujet "Resistive wall impedance"

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Okoor, Sondos, A. M. Al-Khateeb et I. M. Odeh. « Longitudinal coupling impedance for particle beams with Gaussian charge distributions in the longitudinal and transverse directions ». Canadian Journal of Physics 88, no 8 (août 2010) : 597–605. http://dx.doi.org/10.1139/p10-036.

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The longitudinal coupling impedance is obtained analytically for a smooth and resistive cylindrical pipe of finite wall thickness. We assumed a particle beam with Gaussian charge distribution in the longitudinal and transverse directions. For wall thicknesses d less than the skin depth, the impedance increases because of coupling with the vacuum outside the pipe, while for thicknesses d nearly of the order of the skin depth, the impedance becomes independent of the wall thickness. The resistive wall impedance decreases with increasing wall conductivity and it has its maximum values at low frequencies. By increasing beam energies, the space charge impedance decreases while the resistive wall contribution increases. Gaussian and uniform beams have nearly the same impedance at low energy, independent of the wall thickness, while at higher energies obvious differences are observed at wall thicknesses below the skin penetration depth.
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kim, Eun San, Su-Youn Lee et Ji-Gwang Hwang. « Effects of Resistive Wall Impedance in PLS-II Storage Ring ». Journal of the Korean Physical Society 56, no 6(1) (15 juin 2010) : 1957–59. http://dx.doi.org/10.3938/jkps.56.1957.

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Nakamura, N. « Resistive-wall impedance effects for the new KEK Light Source ». Journal of Physics : Conference Series 874 (juillet 2017) : 012069. http://dx.doi.org/10.1088/1742-6596/874/1/012069.

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Hantos, Z., B. Daroczy, B. Suki et S. Nagy. « Low-frequency respiratory mechanical impedance in the rat ». Journal of Applied Physiology 63, no 1 (1 juillet 1987) : 36–43. http://dx.doi.org/10.1152/jappl.1987.63.1.36.

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modified forced oscillatory technique was used to determine the respiratory mechanical impedances in anesthetized, paralyzed rats between 0.25 and 10 Hz. From the total respiratory (Zrs) and pulmonary impedance (ZL), measured with pseudorandom oscillations applied at the airway opening before and after thoracotomy, respectively, the chest wall impedance (ZW) was calculated as ZW = Zrs - ZL. The pulmonary (RL) and chest wall resistances were both markedly frequency dependent: between 0.25 and 2 Hz they contributed equally to the total resistance falling from 81.4 +/- 18.3 (SD) at 0.25 Hz to 27.1 +/- 1.7 kPa.l–1 X s at 2 Hz. The pulmonary compliance (CL) decreased mildly, from 2.78 +/- 0.44 at 0.25 Hz to 2.36 +/- 0.39 ml/kPa at 2 Hz, and then increased at higher frequencies, whereas the chest wall compliance declined monotonously from 4.19 +/- 0.88 at 0.25 Hz to 1.93 +/- 0.14 ml/kPa at 10 Hz. Although the frequency dependence of ZW can be interpreted on the basis of parallel inhomogeneities alone, the sharp fall in RL together with the relatively constant CL suggests that at low frequencies significant losses are imposed by the non-Newtonian resistive properties of the lung tissue.
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BANE, K. L. F. « WAKEFIELDS OF SUB-PICOSECOND ELECTRON BUNCHES ». International Journal of Modern Physics A 22, no 22 (10 septembre 2007) : 3736–58. http://dx.doi.org/10.1142/s0217751x07037391.

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We discuss wakefields excited by short bunches in accelerators. In particular, we review some of what has been learned in recent years concerning diffraction wakes, roughness impedance, coherent synchrotron radiation wakes, and the resistive wall wake, focusing on analytical solutions where possible. As examples, we apply formulas for these wakes to various parts of the Linac Coherent Light Source (LCLS) project. The longitudinal accelerator structure wake of the SLAC linac is an important ingredient in the LCLS bunch compression process. Of the wakes in the undulator region, the dominant one is the resistive wall wake of the beam pipe.
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Al-Khateeb, A., R. W. Hasse, O. Boine-Frankenheim et I. Hofmann. « Screening of the resistive-wall impedance by a cylindrical electron plasma ». New Journal of Physics 10, no 8 (6 août 2008) : 083008. http://dx.doi.org/10.1088/1367-2630/10/8/083008.

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Casalbuoni, S., M. Migliorati, A. Mostacci, L. Palumbo et B. Spataro. « Beam heat load due to geometrical and resistive wall impedance in COLDDIAG ». Journal of Instrumentation 7, no 11 (9 novembre 2012) : P11008. http://dx.doi.org/10.1088/1748-0221/7/11/p11008.

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Akbar, Noreen Sher, et S. Nadeem. « Mathematical analysis of Phan-Thien–Tanner fluid model for blood in arteries ». International Journal of Biomathematics 08, no 05 (13 août 2015) : 1550064. http://dx.doi.org/10.1142/s1793524515500643.

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In the present paper, we have studied the blood flow through tapered artery with a stenosis. The non-Newtonian nature of blood in small arteries is analyzed mathematically by considering the blood as Phan-Thien–Tanner fluid. The representation for the blood flow is through an axially non-symmetrical but radially symmetric stenosis. Symmetry of the distribution of the wall shearing stress and resistive impedance and their growth with the developing stenosis is another important feature of our analysis. Exact solutions have been evaluated for velocity, resistance impedance, wall shear stress and shearing stress at the stenosis throat. The graphical results of different type of tapered arteries (i.e. converging tapering, diverging tapering, non-tapered artery) have been examined for different parameters of interest.
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Casalbuoni, S., M. Migliorati, A. Mostacci, L. Palumbo et B. Spataro. « Erratum : beam heat load due to geometrical and resistive wall impedance in COLDDIAG ». Journal of Instrumentation 7, no 12 (20 décembre 2012) : E12001. http://dx.doi.org/10.1088/1748-0221/7/12/e12001.

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Akbar, Noreen Sher. « Blood flow of Carreau fluid in a tapered artery with mixed convection ». International Journal of Biomathematics 07, no 06 (novembre 2014) : 1450068. http://dx.doi.org/10.1142/s1793524514500685.

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This research is concerned with the mathematical modeling and analysis of blood flow in a tapered artery with stenosis. The analysis has been carried out in the presence of heat and mass transfer. Constitutive equation of Carreau fluid has been invoked in the mathematical formulation. The representation of blood flow is considered through an axially non-symmetrical but radially symmetric stenosis. Symmetry of the distribution of the wall shearing stress and resistive impedance and their growth with the developing stenosis is given due attention. Solutions have been obtained for the velocity, temperature, concentration, resistance impedance, wall shear stress and shearing stress at the stenosis throat. Graphical illustrations associated with the tapered arteries namely converging, diverging and non-tapered arteries are examined for different parameters of interest. Streamlines have been plotted and discussed.
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Thèses sur le sujet "Resistive wall impedance"

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Lutman, Alberto. « Impact of the wakefields and of an initial energy curvature on a Free Electron Laser ». Doctoral thesis, Università degli studi di Trieste, 2010. http://hdl.handle.net/10077/3678.

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2008/2009
For an X-ray free electron laser (FEL), a high-quality electron bunch with low emittance, high peak current and energy is needed. During the phases of acceleration, bunch compression and transportation, the electron beam is subject to radio frequency curvature and to wakefields effects. Thus, the energy profile of the electron beam can present a parabolic profile, which has important electromagnetic effects on the FEL process. The quality of the electron beam is also degraded by the interaction with the low-gap undulator vacuum chamber. In our work we first analyze this interaction, deriving a formula to evaluate the longitudinal and the transversal wakefields for an elliptical cross section vacuum chamber, obtaining accurate results in the short range. Subsequently within the Vlasov-Maxwell one-dimensional model, we derive the Green functions necessary to evaluate the radiation envelope, having as initial conditions both an energy chirp and curvature on the electrons and eventually an initial bunching, which is useful to treat the harmonic generation FEL cascade configuration. This allows to study the impact of the elecron beam energy profile on the FEL performance. Using the derived Green functions we discuss FEL radiation properties such as bandwidth, frequency shift, frequency chirp and velocity of propagation. Finally, we propose a method to achieve ultra-short FEL pulses using a frequency chirp on the seed laser and a suitable electron energy profile.
XXII Ciclo
1980
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Actes de conférences sur le sujet "Resistive wall impedance"

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Metral, E., B. Zotter et B. Salvant. « Resistive-wall impedance of an infinitely long multi-layer cylindrical beam pipe ». Dans 2007 IEEE Particle Accelerator Conference (PAC). IEEE, 2007. http://dx.doi.org/10.1109/pac.2007.4439984.

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Liter, S. G., K. A. Shollenberger, J. R. Torczynski et S. L. Ceccio. « Measuring Material Distributions of Multiphase Flows in Electrically Conducting Vessels Using Electrical-Impedance Tomography ». Dans ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/fedsm2002-31377.

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An implementation of resistive electrical-impedance tomography (EIT) for measuring material distributions of multiphase flows in vessels with electrically conducting walls is presented. Seven ring electrodes are equally spaced on a thin nonconducting rod that is inserted into the vessel. The vessel wall is grounded and serves as the ground electrode. Voltage distribution measurements are used to numerically reconstruct the time-averaged impedance distribution within the vessel, from which the material distributions are inferred. Experimental results for the case in which the rod is inserted coaxially into a liquid-filled vertical standpipe containing beds of different heights of nonconducting solid particles are presented. Agreement between the direct measurement and the numerical reconstruction of the particle-bed height is good. Application of this technique to a pilot-scale slurry bubble-column reactor is discussed.
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Rapports d'organisations sur le sujet "Resistive wall impedance"

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Stupakov, G. Resistive Wall Impedance of an Insert. Office of Scientific and Technical Information (OSTI), mars 2005. http://dx.doi.org/10.2172/839927.

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Heifets, S. Resistive Wall Contribution to the Impedance of a Collimator. Office of Scientific and Technical Information (OSTI), septembre 2004. http://dx.doi.org/10.2172/833012.

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Blednykh, Alexei, Gabriele Bassi, Yoshiteru Hidaka, Victor Smalyuk et Gennady Stupakov. Betatron Tune Shifts Induced by the Low-Frequency Resistive Wall Impedance. Office of Scientific and Technical Information (OSTI), mai 2016. http://dx.doi.org/10.2172/1504884.

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