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Experimental Measurements of the Secondary Electron Yield in the Experimental Measurement of the Secondary Electron Yield in the PEP-II Particle Accelerator Beam Line

Journal Article · · Nucl.Instrum.Meth.A621:47-56,2010
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Beam instability caused by the electron cloud has been observed in positron and proton storage rings and it is expected to be a limiting factor in the performance of the positron Damping Ring (DR) of future Linear Colliders (LC) such as ILC and CLIC. To test a series of promising possible electron cloud mitigation techniques as surface coatings and grooves, in the Positron Low Energy Ring (LER) of the PEP-II accelerator, we have installed several test vacuum chambers including (i) a special chamber to monitor the variation of the secondary electron yield of technical surface materials and coatings under the effect of ion, electron and photon conditioning in situ in the beam line; (ii) chambers with grooves in a straight magnetic-free section; and (iii) coated chambers in a dedicated newly installed 4-magnet chicane to study mitigations in a magnetic field region. In this paper, we describe the ongoing R&D effort to mitigate the electron cloud effect for the LC damping ring, focusing on the first experimental area and on results of the reduction of the secondary electron yield due to in situ conditioning.
Research Organization:
SLAC National Accelerator Laboratory (SLAC)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC02-76SF00515
OSTI ID:
992435
Report Number(s):
SLAC-PUB-14000
Journal Information:
Nucl.Instrum.Meth.A621:47-56,2010, Journal Name: Nucl.Instrum.Meth.A621:47-56,2010
Country of Publication:
United States
Language:
English

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Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
Accelerators
ACCPHY
CLOUDS
COATINGS
DAMPING
ELECTRONS
FOCUSING
INSTABILITY
LINEAR COLLIDERS
MAGNETIC FIELDS
MITIGATION
MONITORS
PERFORMANCE
PHOTONS
POSITRONS
PROTONS
STORAGE RINGS
SURFACE COATING