Development of a fast traveling-wave beam chopper for the National Spallation Neutron Source
High current and severe restrictions on beam losses, below 1 nA/m, in the designed linac for the National Spallation Neutron Source (NSNS) require clean and fast--with the rise time from 2% to 98% less than 2.5 ns to accommodate a 402.5-MHz beam structure--beam chopping in its front end, at the beam energy 2.5 MeV. The R and D program includes both modification of the existing LANSCE coax-plate chopper to reduce parasitic coupling between adjacent plates, and development of new traveling-wave deflecting structures, in particular, based on a meander line. Using analytical methods and three-dimensional time-domain computer simulations the authors study transient effects in such structures to choose an optimal chopper design.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36; AC05-96OR22464
- OSTI ID:
- 532539
- Report Number(s):
- LA-UR-97-1705; CONF-970503-229; ON: DE97008187; TRN: 97:019451
- Resource Relation:
- Conference: 17. IEEE particle accelerator conference, Vancouver (Canada), 12-16 May 1997; Other Information: PBD: [1997]
- Country of Publication:
- United States
- Language:
- English
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