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Title: Multi-pulse coupling of the resistive-wall instability

  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Scorpius Team Meeting ; 2016-07-13 - 2016-07-13 ; Albuquerque, New Mexico, United States
Country of Publication:
United States

Citation Formats

Ekdahl, Carl August. Multi-pulse coupling of the resistive-wall instability. United States: N. p., 2016. Web.
Ekdahl, Carl August. Multi-pulse coupling of the resistive-wall instability. United States.
Ekdahl, Carl August. 2016. "Multi-pulse coupling of the resistive-wall instability". United States. doi:.
title = {Multi-pulse coupling of the resistive-wall instability},
author = {Ekdahl, Carl August},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 8

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  • The transverse motion of a beam traversing a narrow beam pipe is modified by resistive-wall effects. Depending on the strength of the focusing force from the alternating wiggler field, the effect ranges from a modification of the oscillation to a growth in transverse displacement with the length of pipe. This transverse effect saturates after a number of bunches have passed. The saturated transverse effect depends only on the pipe radius b (it increases as 1/b/sup 2/), but is independent of the thickness /tau/ and conductivity sigma of the pipe. However, /tau/ and sigma affect the time needed to attain saturation.more » 5 refs., 2 figs.« less
  • The Advanced Photon Source (APS) storage ring is a 7-GeV light source with 40 straight sections. Intense x-ray beams will be delivered by 34 insertion devices installed in these straight sections. The vacuum chamber for the insertion devices has an elliptical cross section with the gap equal to 8 mm. With this narrow gap, we estimate that the transverse impedance of the ring at the revolution frequency could be as high as 36 M{Omega} from the resistive wall. By increasing the (unnormalized) chromaticity to 7, we cure the head-tail modes of order up to m=l for all 60 coupled bunchmore » mode patterns around the ring. Tracking results show that the increased sextupole strength resulting from a higher chromaticity does not significantly reduce the dynamic aperture. Since increased chromaticity alone-cannot cure all the head-tail modes, the APS storage ring will have a feedback system to damp the rigid-bunch modes.« less
  • In the damping rings of the International Linear Collider (ILC), the resistive-wall instability is one of the dominant transverse instabilities. This instability directly influences the choice of material and aperture of the vacuum pipe, and the parameters of the transverse feedback system. This paper investigates the resistive-wall instabilities in an ILC damping ring under various conditions of beam pipe material, aperture, and fill pattern.
  • A general model for wakefield-generated instabilities in linear accelerators, originally developed for cumulative beam breakup [1], is applied to the resistive wall instability. The general solution for various bunch charge distributions and application to various accelerator configurations are presented.