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Title: Wakefield and Beam Centering Measurements of a Damped and Detuned X-Band Accelerator Structure

Abstract

In the Next Linear Collider (NLC) design, X-Band (11.4 GHz) accelerator structures are used to accelerate multibunch beams to several hundred GeV. Although these structures allow for high gradient operation, their strong deflecting modes impose a number of operational constraints. In particular, the long-range transverse wakefields generated by the bunches need to be reduced by about two orders of magnitude to prevent significant beam breakup. During the past five years, a reduction scheme that employs both detuning and damping of the structure dipole modes has been developed to meet this requirement. Several prototype Damped and Detuned Structures (DDS) have been built to test and refine this scheme. The wakefield of the latest version, DDS3, has recently been measured in the Accelerator Structure Setup (ASSET) facility at SLAC. In this paper, we present these results together with predictions based on an equivalent circuit model of the structure. We also present ASSET studies in which the beam-induced dipole signals that are coupled out for damping purposes are used to center the beam in the structure.

Authors:
Publication Date:
Research Org.:
Stanford Linear Accelerator Center, Menlo Park, CA (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
12471
Report Number(s):
SLAC-PUB-8174
TRN: US0401872
DOE Contract Number:  
AC03-76SF00515
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 14 Sep 1999
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; DAMPING; DESIGN; DIPOLES; EQUIVALENT CIRCUITS; LINEAR COLLIDERS; STANFORD LINEAR ACCELERATOR CENTER

Citation Formats

Adolphsen, Chris. Wakefield and Beam Centering Measurements of a Damped and Detuned X-Band Accelerator Structure. United States: N. p., 1999. Web. doi:10.2172/12471.
Adolphsen, Chris. Wakefield and Beam Centering Measurements of a Damped and Detuned X-Band Accelerator Structure. United States. doi:10.2172/12471.
Adolphsen, Chris. Tue . "Wakefield and Beam Centering Measurements of a Damped and Detuned X-Band Accelerator Structure". United States. doi:10.2172/12471. https://www.osti.gov/servlets/purl/12471.
@article{osti_12471,
title = {Wakefield and Beam Centering Measurements of a Damped and Detuned X-Band Accelerator Structure},
author = {Adolphsen, Chris},
abstractNote = {In the Next Linear Collider (NLC) design, X-Band (11.4 GHz) accelerator structures are used to accelerate multibunch beams to several hundred GeV. Although these structures allow for high gradient operation, their strong deflecting modes impose a number of operational constraints. In particular, the long-range transverse wakefields generated by the bunches need to be reduced by about two orders of magnitude to prevent significant beam breakup. During the past five years, a reduction scheme that employs both detuning and damping of the structure dipole modes has been developed to meet this requirement. Several prototype Damped and Detuned Structures (DDS) have been built to test and refine this scheme. The wakefield of the latest version, DDS3, has recently been measured in the Accelerator Structure Setup (ASSET) facility at SLAC. In this paper, we present these results together with predictions based on an equivalent circuit model of the structure. We also present ASSET studies in which the beam-induced dipole signals that are coupled out for damping purposes are used to center the beam in the structure.},
doi = {10.2172/12471},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {9}
}

Technical Report:

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