National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Electron-Cloud Mitigation in the Spallation Neutron Source Ring.

DE2008925782

Publication Date	2008
Personal Author	Wei, J.; Blaskiewicz, M.; Brdowski, J.; Cameron, P.; Davino, D.
Page Count	3
Abstract	The Spallation Neutron Source (SNS) accumulator ring is designed to accumulate, via H(sup -) injection, protons of 2 MW beam power at 1 GeV kinetic energy at a repetition rate of 60 Hz. At such beam intensity, electron-cloud is expected to be one of the intensity-limiting mechanisms that complicate ring operations. This paper summarizes mitigation strategy adopted in the design, both in suppressing electron-cloud formation and in enhancing Landau damping, including tapered magnetic field and monitoring system for the collection of stripped electrons at injection, TiN coated beam chamber for suppression of the secondary yield, clearing electrodes dedicated for the injection region and parasitic on BPMs around the ring, solenoid windings in the collimation region, and planning of vacuum systems for beam scrubbing upon operation.
Keywords	Particle accelerators Electron cloud mitigation Neutron sources Clouds Electrodes Vacuum systems Tanks Spallation Kinetic energy Electrons Solenoids Protons Monitoring Mitigation Magnetic fields Scrubbing Spallation Neutron Source (SNS) accumulator ring Landau damping
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Stanford Linear Accelerator Center, CA.; Brookhaven National Lab., Upton, NY.; European Organization for Nuclear Research, Geneva (Switzerland).; Oak Ridge National Lab., TN.; Department of Energy, Washington, DC.
Supplemental Notes	Prepared in cooperation with Brookhaven National Lab., Upton, NY., Oak Ridge National Lab., TN. and European Organization for Nuclear Research, Geneva (Switzerland). Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200824
Contract Number	DE-AC02-76SF00515

Electron-Cloud Mitigation in the Spallation Neutron Source Ring.

Electron-Cloud Mitigation in the Spallation Neutron Source Ring.
DE2008925782

Publication Date	2008
Personal Author	Wei, J.; Blaskiewicz, M.; Brdowski, J.; Cameron, P.; Davino, D.
Page Count	3
Abstract	The Spallation Neutron Source (SNS) accumulator ring is designed to accumulate, via H(sup -) injection, protons of 2 MW beam power at 1 GeV kinetic energy at a repetition rate of 60 Hz. At such beam intensity, electron-cloud is expected to be one of the intensity-limiting mechanisms that complicate ring operations. This paper summarizes mitigation strategy adopted in the design, both in suppressing electron-cloud formation and in enhancing Landau damping, including tapered magnetic field and monitoring system for the collection of stripped electrons at injection, TiN coated beam chamber for suppression of the secondary yield, clearing electrodes dedicated for the injection region and parasitic on BPMs around the ring, solenoid windings in the collimation region, and planning of vacuum systems for beam scrubbing upon operation.
Keywords	Particle accelerators Electron cloud mitigation Neutron sources Clouds Electrodes Vacuum systems Tanks Spallation Kinetic energy Electrons Solenoids Protons Monitoring Mitigation Magnetic fields Scrubbing Spallation Neutron Source (SNS) accumulator ring Landau damping
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Stanford Linear Accelerator Center, CA.; Brookhaven National Lab., Upton, NY.; European Organization for Nuclear Research, Geneva (Switzerland).; Oak Ridge National Lab., TN.; Department of Energy, Washington, DC.
Supplemental Notes	Prepared in cooperation with Brookhaven National Lab., Upton, NY., Oak Ridge National Lab., TN. and European Organization for Nuclear Research, Geneva (Switzerland). Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200824
Contract Number	DE-AC02-76SF00515