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Title: REDUCING BEAM COUPLING IMPEDANCES IN SNS RING EXTRACTION KICKERS

The Spallation Neutron Source (SNS) Accumulator ring extraction system includes 14 modules of windowframe ferrite pulsing kicker magnets with the rise time of about 200 ns. Their contribution to the beam coupling impedances is a serious concern. The kicker impedances, as well as its deflecting magnetic field versus time, are studied using detailed 3-D MAFIA modeling. Various design options, external circuit resistances, and a range of ferrite permeabilities are explored. A kicker module with wide conductor windings around the ferrite behind the kicker current sheet suggests a significant reduction of the kicker transverse and longitudinal coupling impedances. This design provides a good extraction field performance, as demonstrated by electromagnetic simulations. Results of measurements for a small model are also presented.
Authors:
 [1] ;  [2] ;
  1. (Sergey)
  2. (Daniele)
Publication Date:
OSTI Identifier:
975509
Report Number(s):
LA-UR-01-3092
TRN: US1006719
Resource Type:
Conference
Resource Relation:
Conference: Submitted to: 2001 Particle Accelerator Conference, June 18-22, 2001, Chicago, IL.
Research Org:
Los Alamos National Laboratory
Sponsoring Org:
DOE
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; DESIGN; FERRITE; KICKER MAGNETS; MAGNETIC FIELDS; NEUTRON SOURCES; PERFORMANCE; PULSE RISE TIME; SIMULATION; SPALLATION; TANKS