Trapping of Electron Cloud LLC/Cesrta Quadrupole and Sextupole Magnets Metadata

Metadata describes a digital item, providing (if known) such information as creator, publisher, contents, size, relationship to other resources, and more. Metadata may also contain "preservation" components that help us to maintain the integrity of digital files over time.

Available Formats

Dublin Core: XML Dublin Core: JSON Dublin Core: Text Dublin Core: RDF/XML UNTL: XML Access METS: XML

Title

  • Main Title Trapping of Electron Cloud LLC/Cesrta Quadrupole and Sextupole Magnets

Creator

  • Author: Wang, L.
    Creator Type: Personal
  • Author: Pivi, M.
    Creator Type: Personal
    Creator Info: /SLAC

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization

Publisher

  • Name: SLAC National Accelerator Laboratory
    Place of Publication: United States
    Additional Info: SLAC National Accelerator Laboratory (SLAC)

Date

  • Creation: 2011-08-18

Language

  • English

Description

  • Content Description: The Cornell Electron Storage Ring (CESR) has been reconfigured as an ultra low emittance damping ring for use as a test accelerator (CesrTA) for International Linear Collider (ILC) damping ring R&D [1]. One of the primary goals of the CesrTA program is to investigate the interaction of the electron cloud with low emittance positron beam to explore methods to suppress the electron cloud, develop suitable advanced instrumentation required for these experimental studies and benchmark predictions by simulation codes. This paper reports the simulation of the electron-cloud formation in CESRTA and ILC quadrupole and sextupole magnets using the 3D code CLOUDLAND. We found that electrons can be trapped with a long lifetime in a quadrupole and sextupole magnet due to the mirror field trapping mechanism. We study the effects of magnet strength, bunch current, ante-chamber effect, bunch spacing effect and secondary emission yield (SEY) in great detail. The development of an electron cloud in magnets is the main concern where a weak solenoid field is not effective. Quadrupole and sextupole magnets have mirror field configurations which may trap electrons by the mirror field trapping mechanism [2]. Fig.1 shows the orbit of a trapped electron in a quadrupole magnet. The electron makes gyration motion (called transverse motion) and also moves along the field line (called longitudinal motion). At the mirror point (middle of the field line), there is a maximum longitudinal energy and minimum transverse energy. When the electron moves away from the mirror point, its longitudinal energy reduces and the transverse energy increases as the magnetic field increases. If the magnetic field is strong enough, the longitudinal energy becomes zero at one point and then the electron is turned back by the strong field. Note that the electrons are trapped in the region near the middle of the field lines. Although all quadrupole and sextupole magnets can trap electrons in principle, the trapping mechanism is also greatly sensitive to the detail dynamics of the electrons [3]. Both the positron beam and the spacing charge force of electron cloud itself play important roles. This paper reports the simulation of electron cloud in CESRTA/ILC quadrupole and sextupole magnets. Table 1 shows the main parameters used in the simulation.
  • Physical Description: 6 pages

Subject

  • Keyword: Trapping Accelerators,Accphy
  • Keyword: Quadrupoles
  • Keyword: Magnetic Fields
  • Keyword: Clouds
  • Keyword: Solenoids
  • Keyword: Mirrors
  • STI Subject Categories: 43 Particle Accelerators
  • Keyword: Benchmarks
  • Keyword: Secondary Emission
  • Keyword: Positron Beams
  • Keyword: Simulation
  • Keyword: Trapped Electrons
  • Keyword: Storage Rings
  • Keyword: Magnets
  • Keyword: Accelerators,Accphy
  • Keyword: Electrons
  • Keyword: Lifetime
  • Keyword: Accelerators
  • Keyword: Damping
  • Keyword: Transverse Energy
  • Keyword: Linear Colliders

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report

Format

  • Text

Identifier

  • Report No.: SLAC-PUB-14388
  • Grant Number: AC02-76SF00515
  • DOI: 10.2172/1022508
  • Office of Scientific & Technical Information Report Number: 1022508
  • Archival Resource Key: ark:/67531/metadc830923

Note

  • Display Note: http://www.slac.stanford.edu/cgi-wrap/pubpage?slac-pub-14388.html
Back to Top of Screen