skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A proposed SSC damper system

Abstract

A transverse beam damper system for providing stability against ground motion, resistive wall instabilities, and other effects is the Superconducting Super Collider (SSC) is outlined. Use of two monitors, as in existing designs, provides phase insensitivity. The novel feature is the use of two kickers, which permits almost exact orbit compensation within one turn. Bunch-by-bunch stabilization requires fast computation.

Authors:
; ; ; ; ;  [1]
  1. (Superconducting Super Collider Lab., Dallas, TX (United States))
Publication Date:
OSTI Identifier:
7235046
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States); Journal Volume: 41:1 Pt2
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BETATRON OSCILLATIONS; DAMPING; SUPERCONDUCTING SUPER COLLIDER; ORBIT STABILITY; BEAM BUNCHING; BEAM MONITORS; BEAM OPTICS; BEAM POSITION; KICKER MAGNETS; POSITIONING; BEAM DYNAMICS; ELECTRICAL EQUIPMENT; ELECTROMAGNETS; EQUIPMENT; MAGNETS; MEASURING INSTRUMENTS; MONITORS; OSCILLATIONS; STABILITY; STORAGE RINGS; 430200* - Particle Accelerators- Beam Dynamics, Field Calculations, & Ion Optics; 430300 - Particle Accelerators- Auxiliaries & Components

Citation Formats

Tsyganov, E., Dugan, G., Lopez, G., Meinke, R., Nexson, W., and Talman, R.. A proposed SSC damper system. United States: N. p., 1994. Web. doi:10.1109/23.281511.
Tsyganov, E., Dugan, G., Lopez, G., Meinke, R., Nexson, W., & Talman, R.. A proposed SSC damper system. United States. doi:10.1109/23.281511.
Tsyganov, E., Dugan, G., Lopez, G., Meinke, R., Nexson, W., and Talman, R.. 1994. "A proposed SSC damper system". United States. doi:10.1109/23.281511.
@article{osti_7235046,
title = {A proposed SSC damper system},
author = {Tsyganov, E. and Dugan, G. and Lopez, G. and Meinke, R. and Nexson, W. and Talman, R.},
abstractNote = {A transverse beam damper system for providing stability against ground motion, resistive wall instabilities, and other effects is the Superconducting Super Collider (SSC) is outlined. Use of two monitors, as in existing designs, provides phase insensitivity. The novel feature is the use of two kickers, which permits almost exact orbit compensation within one turn. Bunch-by-bunch stabilization requires fast computation.},
doi = {10.1109/23.281511},
journal = {IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States)},
number = ,
volume = 41:1 Pt2,
place = {United States},
year = 1994,
month = 2
}
  • An efficient impact damper consists of a bed of granular materials moving in a container mounted on a multibody vibrating system. This paper deals with the damping characteristics of a multidegree-of-freedom (MDOF) system that is provided with the impact damper when the damper may be applied to any point of the system. In the theoretical analysis, the particle bed is assumed to be a mass which moves unidirectionally in a container, and collides plastically with its end. Equations of motion are developed for an equivalent single-degree-of-freedom (SDOF) system and attached damper mass with use made of the normal mode approach.more » The modal mass is estimated such that it represents the equivalent mass on the point of maximum displacement in each of the vibrating modes. The mass ratio is modified with the modal vector to include the effect of impact interactions. Results of the analysis are applied to the special case of a three-degree-of-freedom (3DOF) system, and the effects of the damper parameters including mode shapes and damper locations are determined. A digital model is also formulated to simulate the damped motion of the physical system.« less
  • Numerical simulation of the superconducting magnetically levitated bogie (JR Maglev) has been studied. The active damper coil system is introduced. In this levitation system, the interaction between levitation and guidance is strong. This active damper coil system is designed for reducing the vertical vibration of the bogie. Using the numerical simulation, its effect on the lateral displacement of the bogie is assessed. The active damper coil system for the vertical vibration is shown to works as a passive damper for the lateral vibration.
  • A transverse damping system is used in the Recycler at Fermilab to damp beam instabilities which arise from large beam intensities with electron cooling. Initial tests of electron cooling demonstrated beam loss due to transverse beam motion when the beam was cooled past the beam density threshold. The transverse damper system consists of two horizontal and two vertical pickups whose signals are amplified and passed into an analog hybrid to generate a difference signal from each pickup. The difference signals are input to a custom digital damper board which digitizes the analog signals at 212MHz, performs digital processing of themore » signals inside a large Altera Stratix II FPGA, then provides analog output at 212MHz via digital to analog converters. The digital damper output is sent to amplifiers which drive one horizontal and one vertical kicker. An initial prototype digital damper board has been successfully used in the Recycler for over six months. Currently, work is underway to replace the prototype board with an upgraded VME version.« less
  • Magneto-rheological (MR) damper possesses inherent hysteretic characteristics. We investigate the resulting nonlinear behaviors of a two degree-of-freedom (2-DoF) MR vibration isolation system under harmonic external excitation. A MR damper is identified by employing the modified Bouc-wen hysteresis model. By numerical simulation, we characterize the nonlinear dynamic evolution of period-doubling, saddle node bifurcating and inverse period-doubling using bifurcation diagrams of variations in frequency with a fixed amplitude of the harmonic excitation. The strength of chaos is determined by the Lyapunov exponent (LE) spectrum. Semi-physical experiment on the 2-DoF MR vibration isolation system is proposed. We trace the time history and phasemore » trajectory under certain values of frequency of the harmonic excitation to verify the nonlinear dynamical evolution of period-doubling bifurcations to chaos. The largest LEs computed with the experimental data are also presented, confirming the chaotic motion in the experiment. We validate the chaotic motion caused by the hysteresis of the MR damper, and show the transitions between distinct regimes of stable motion and chaotic motion of the 2-DoF MR vibration isolation system for variations in frequency of external excitation.« less