Results of the SNS front end commissioning at Berkeley Lab

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The Front-End Systems (FES) for the Spallation Neutron Source (SNS) project comprise an rf-driven H{sup -} ion source, an electrostatic 2-lens LEBT, a 2.5 MeV RFQ, followed by a 14-quadrupole, 4-rebuncher MEBT including traveling-wave fast choppers. The nominal 2.5 MeV H{sup -} beam has a current of 38 mA at a repetition rate of 60 Hz and 1 ms pulse length, for a macro duty-factor of 6%, and is chopped at a rate of approximately 1 MHz with a mini duty-factor of 68%. The normalized rms beam emittance at the MEBT exit, matching the first tank of a 402.5 MHz ... continued below

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Ratti, A.; Ayers, J.J.; Doolittle, L.; Greer, J.B.; Keller, R.; Lewis, S. et al. August 16, 2002.

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Description

The Front-End Systems (FES) for the Spallation Neutron Source (SNS) project comprise an rf-driven H{sup -} ion source, an electrostatic 2-lens LEBT, a 2.5 MeV RFQ, followed by a 14-quadrupole, 4-rebuncher MEBT including traveling-wave fast choppers. The nominal 2.5 MeV H{sup -} beam has a current of 38 mA at a repetition rate of 60 Hz and 1 ms pulse length, for a macro duty-factor of 6%, and is chopped at a rate of approximately 1 MHz with a mini duty-factor of 68%. The normalized rms beam emittance at the MEBT exit, matching the first tank of a 402.5 MHz Alvarez linac, is measured to be approximately 0.3 {pi} mm mrad. Diagnostic elements include wire scanners, BPMs, fast current monitors, a slit-harp emittance device and RFQ field monitoring probes. The results of the beam commissioning and the operation of the RFQ and diagnostic instrumentation are reported. The entire FES was shut down at LBNL at the end of May 2002 and will be recommissioned at ORNL prior to installation of the drift-tube linac.

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INIS; OSTI as DE00805140

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  • XXI International 2002 Linac Conference, Kyonju (KR), 08/19/2002--08/23/2002

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  • Report No.: LBNL--51411
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 805140
  • Archival Resource Key: ark:/67531/metadc738428

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  • August 16, 2002

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 4, 2016, 2:19 p.m.

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Ratti, A.; Ayers, J.J.; Doolittle, L.; Greer, J.B.; Keller, R.; Lewis, S. et al. Results of the SNS front end commissioning at Berkeley Lab, article, August 16, 2002; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc738428/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.