Quantification of resistive wall instability for particle accelerator machines

Resistive-wall Instability Experiment in Space-charge Dominated Electron Beams

The resistive-wall instability of charged particle beams has been experimentally studied in space-charge dominated electron beams. The beam energy is in the range of 3 to 8.5 keV, the beam current is between 25 mA and 62 mA. In the experiment, electron beams produced from a thermionic cathode are passed through a 0.96 m long glass tube coated with a resistive material, and localized space-charg...

Model based approach to resistive wall magnetohydrodynamic instability control

The primary objective of fusion research is to realize a thermonuclear fusion power plant. The main method to confine the hot plasma is by using a magnetic field. The reversed-field pinch is a type of magnetic confinement device which suffers from variety of magnetohydrodynamic (MHD) instabilities. A particular unstable mode that is treated in this work is the resistive wall mode (RWM), which o...

Resistive wall feedback stabilization

Active Feedback for Curing the Transverse Resistive Wall Instability in the Sps

The resistive wall impedance in the SPS causes transverse coupled bunch instabilities, that have to be cured by active feedback. The status of the upgrade program for the feedback system (damper) will be reviewed. Results of machine development sessions of 1999 will be presented with emphasis on the performance with LHC type beam. Plans for the year 2000 run are outlined.

Resistive wall modes and nonuniform wall rotation

The resistive wall mode ~RWM! poses a threat to many plasma confinement devices. The continuous rotation of the wall relative to the plasma makes it appear perfectly conducting, because of the skin effect, but this is ineffective if the perturbation locks to the wall. This raises the question of whether a nonuniformly rotating wall is more effective. In this paper we discuss the effect of such ...