Advances in the performance of the SNS ion source

R. F. Welton, M. P. Stockli, S. N. Murray, R. Keller

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

The ion source developed for the Spallation Neutron Source* (SNS) is a radio frequency, multi-cusp source designed to produce ∼ 40 m A of H - with a normalized rms emittance of less than 0.2 π·mm·mrad. To date the source has been utilized in commissioning the SNS accelerator, delivering beams of 10-50 mA with duty-factors of typically ∼0.1% for operational periods of several weeks, achieving an availability of ∼99%. Ultimately the SNS facility will require beam duty-factors of 6% (1 ms pulse length, 60 Hz repetition rate, 21 day run-period). Over the last year, several experiments were performed in which the ion source was continuously operated at full duty-factor and maximum beam current on a test stand. Average beam attenuation rates of ∼5 mA/day were observed and beams in excess of 30 mA could only be sustained for periods of several hours. Recently, a breakthrough in our understanding of the Cs release process has led to the development of a new source conditioning technique which resulted in a dramatic increase in beam persistence with time. H-1 beam attenuation rates have been improved to ∼0.4 mA/day, allowing beams in excess of 30 m A to be delivered continuously at full duty factor for periods of ∼16 days.

Original languageEnglish
Title of host publicationProceedings of the Particle Accelerator Conference, PAC 2005
Pages472-474
Number of pages3
DOIs
StatePublished - 2005
Externally publishedYes
EventParticle Accelerator Conference, PAC 2005 - Knoxville, TN, United States
Duration: May 16 2005May 20 2005

Publication series

NameProceedings of the IEEE Particle Accelerator Conference
Volume2005

Conference

ConferenceParticle Accelerator Conference, PAC 2005
Country/TerritoryUnited States
CityKnoxville, TN
Period05/16/0505/20/05

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