Author: Cutler, R.I.
Paper Title Page
TUP274 Oak Ridge National Laboratory Spallation Neutron Source Electrical Systems Availability and Improvements 1337
 
  • R.I. Cutler, D.E. Anderson, W.E. Barnett, J.D. Hicks, J.J. Mize, J. Moss, K. Norris, V.V. Peplov, K.R. Rust, J. T. Weaver
    ORNL, Oak Ridge, Tennessee, USA
 
  Funding: SNS is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy.
SNS electrical systems have been operational for 4 years. System availability statistics and improvements are presented for ac electrical systems, dc and pulsed power supplies and klystron modulators
 
 
TUP275 SNS Linac Modulator Operational History and Performance 1340
 
  • V.V. Peplov, D.E. Anderson, R.I. Cutler, M. Wezensky
    ORNL, Oak Ridge, Tennessee, USA
  • J.D. Hicks, R.B. Saethre
    ORNL RAD, Oak Ridge, Tennessee, USA
 
  Fourteen High Voltage Converter Modulators (HVCM) were initially installed at the Spallation Neutron Source Linear Accelerator (SNS Linac) at the Oak Ridge National Laboratory in 2005. A fifteenth HVCM was added in 2009. Each modulator provides a pulse of up to 140 kV at a maximum width of 1.35 msec. Peak power level is 11 MW with an 8% duty factor. The HVCM system must be available for neutron production (NP) 24/7 with the exception being two, 6-week maintenance periods per year. HVCM reliability is one of the most important factors to maximize Linac availability and achieve SNS performance goals. During the last few years several modifications have been implemented to improve the overall system reliability. This paper presents operational history of the HVCM systems and examines failure mode statistical data since the modulators began operating at 60 Hz. System enhancements and upgrades aimed at providing long term reliable operation with minimal down time are also discussed in the paper.