Integrated, FPGA Based NMR Teslameter and power supply for accelerator magnets

[摘要] Particle accelerators today have numerous magnets that require controlling. These includemagnets for analysing, beam-path selection, focusing, etc. Also, design specifications arebecoming tighter. A typical modern magnet power supply is expected to have a resolutionof 16-bit and a stability of 10 ppm.This thesis addresses two research areas. First, various aspects of high-performanceaccelerator magnet power supplies are investigated. An isolated dual-stage 3.5 kW converteris designed. The concept is verified through practical measurements. The control systemand high-resolution pulse-width modulation are implemented within a field-programmablegate array.Second, a nuclear-magnetic resonance probe is designed and simulated. It is intended toprovide a measurement of field-strength for feed-back purposes. Some adjustments are madewith existing technology in order to decrease the time between successive measurements tothe order of 10 μs.Also, the support systems (central processing unit, hardware drivers, etc.) are designed,implemented in the field-programmable gate array and tested successfully.

[发布机构] Stellenbosch University