TY - GEN
T1 - Advances in the performance of the SNS ion source
AU - Welton, R. F.
AU - Stockli, M. P.
AU - Murray, S. N.
AU - Keller, R.
PY - 2005
Y1 - 2005
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=33847116179&partnerID=8YFLogxK
U2 - 10.1109/PAC.2005.1590472
DO - 10.1109/PAC.2005.1590472
M3 - Conference contribution
AN - SCOPUS:33847116179
SN - 0780388593
SN - 9780780388598
T3 - Proceedings of the IEEE Particle Accelerator Conference
SP - 472
EP - 474
BT - Proceedings of the Particle Accelerator Conference, PAC 2005
T2 - Particle Accelerator Conference, PAC 2005
Y2 - 16 May 2005 through 20 May 2005
ER -