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in subjects: "Electric Impedance"  
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ac-resistance-measuring instrument

Description: An auto-ranging ac resistance measuring instrument for remote measurement of the resistance of an electrical device or circuit connected to the instrument includes a signal generator which generates an ac excitation signal for application to a load, including the device and the transmission line, a monitoring circuit which provides a digitally encoded signal representing the voltage across the load, and a microprocessor which operates under program control to provide an auto-ranging function by… more
Date: April 22, 1981
Creator: Hof, P. J.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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Longitudinal instability in HIF beams

Description: In contrast to an electron induction accelerator, in which the particle velocity is virtually constant, the resistive and inductive components of accelerating module impedances can cause instability for an intense non-relativistic heavy ion beam accelerated in a similar structure. Since focusing requirements at the fusion pellet imply a momentum spread {approx lt}3 {times} 10{sup {minus}4} at the end of the accelerator, it is essential to understand and suppress this instability. There is also … more
Date: April 1, 1991
Creator: Smith, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Analysis of resonant longitudinal instability in a heavy ion induction linac

Description: A high current beam of subrelativistic ions accelerated in an induction linac is predicted (in some circumstances) to exhibit unstable growth of current fluctuations at high frequencies (v{approximately}100 MHz). The instability is driven by the interaction between the beam and accelerator modules at frequencies close to a cavity resonance. The extent of unstable growth depends on features of the coupling impedance, beam parameters, and total pulse and accelerator lengths. Transient and asympto… more
Date: April 1, 1991
Creator: Lee, E.P. & Smith, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Coaxial wire measurements of the longitudinal coupling impedance

Description: The measurement of the longitudinal coupling impedance of an accelerator component by coaxial wire methods is discussed. Potential errors intrinsic to this method are pointed out and analyzed. It is concluded that measurements using the transmission rather than the reflection coefficient are preferable and are expected to give adequate results in the limit of thin center conductors.
Date: April 1, 1978
Creator: Hahn, H & Pedersen, F
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Relativistic klystron wakefields

Description: Monopole, dipole and quadrupole wake potentials are calculated for two cavities in a standing-wave relativistic klystron, using two independent programs, TBCI and AMOS. Reflections from model terminations which may distort long-range wakes can be mitigated either by using a very long pipe or by using absorptive materials at the pipe boundaries. 7 refs., 10 figs.
Date: April 14, 1989
Creator: Yu, D.U.L. (Duly Consultants, Rancho Palos Verdes, CA (USA)); Craig, G.D. & DeFord, J.F. (Lawrence Livermore National Lab., CA (USA))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Influence of collective effects on the performance of high-luminosity colliders

Description: The design of a high-luminosity electron-positron collider to study B physics is a challenging task from many points of view. In this paper we consider the influence of collective effects on the machine performance; most of our findings are generic,'' in the sense that they depend rather weakly on the details of the machine design. Both single-bunch and coupled-bunch instabilities are described and their effects are estimated based upon an example machine design (APIARY-IV). In addition, we exa… more
Date: April 1, 1990
Creator: Zisman, M. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Beam impedance of a split cylinder

Description: A common geometry for position electrodes at moderately low frequencies is the capacitive pickup consisting of a diagonally- divided cylinder that encloses the beam trajectory. For the simplified system here, a relatively direct approach will given the longitudinal and transverse beam impedances (Z{parallel}and Z{perpendicular}) at low frequencies. This paper discusses the determination of this impedance.
Date: April 1, 1990
Creator: Lambertson, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Proceedings of the impedance and bunch instability workshop

Description: This report discusses the following topics: impedance and bunch lengthening; single bunch stability in the ESRF; a longitudinal mode-coupling instability model for bunch lengthening; high-frequency behavior of longitudinal coupling impedance; beam-induced energy spreads at beam-pipe transitions; on the calculation of wake functions using MAFIA-T3 code; preliminary measurements of the bunch length and the impedance of LEP; measurements and simulations of collective effects in the CERN SPS; bunch… more
Date: April 1, 1990
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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