New controller for high voltage converter modulator at spallation neutron source

Conference · Sun Jan 01 00:00:00 EST 2017

OSTI ID:1361369

Wezensky, Mark W ^[1]; Brown, David L ^[1]; Lee, Sung-Woo ^[1]; Zhukov, Alexander P ^[1]; Geng, Xiaosong ^[1]

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1. ORNL

The Spallation Neutron Source (SNS) has developed a new control system for the High Voltage Convertor Modulator (HVCM) at the SNS to replace the original control system which is approaching obsolescence. The original system was based on controllers for similar high voltage systems that were already in use [1]. The new controller, based on National Instruments PXI/FlexRIO Field Programmable Gate Array (FPGA) platform, offers enhancements such as modular construction, flexibility and non-proprietary software. The new controller also provides new capabilities like various methods for modulator pulse flattening, waveform capture, and first fault detection. This paper will discuss the design of the system, including the human machine interface, based on lessons learned at the SNS and other projects. It will also discuss performance and other issues related to its operation in an accelerator facility which requires high availability. To date, 73% of the operational HVCMs have been upgraded to with the new controller, and the remainder are scheduled for completion by mid-2017.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1361369
• Resource Relation: Conference: IPAC 2017, Copenhagen, Denmark, 20170515, 20170519
• Country of Publication: United States
• Language: English