A5065926412- Particle accelerators and beam dynamics
- Nuclear Physics and Applications
- Magnetic confinement fusion research
- Pulsed Power Technology Applications
- Superconducting Materials and Applications
- Electrostatic Discharge in Electronics
- Gyrotron and Vacuum Electronics Research
- Silicon Carbide Semiconductor Technologies
- Non-Destructive Testing Techniques
- Plasma Diagnostics and Applications
- Particle Accelerators and Free-Electron Lasers
- Oil and Gas Production Techniques
- Radiation Detection and Scintillator Technologies
- Radiation Effects in Electronics
- Energy Harvesting in Wireless Networks
- Radiation Therapy and Dosimetry
- Electron and X-Ray Spectroscopy Techniques
Oak Ridge National Laboratory
2006-2023
Spallation Neutron Source
2015
Early fault detection and prognosis are crucial to ensure efficient safe operations of complex engineering systems such as the Spallation Neutron Source (SNS) its power electronics (high voltage converter modulators). Following an advanced experimental facility setup that mimics SNS operating conditions, authors successfully conducted 21 early experiments, where precursors introduced in system a degree enough cause degradation waveform signals, but not reach real fault. Nine different...
The first-generation high-frequency switching megawatt-class high voltage converter modulators (HVCM) developed by Los Alamos national laboratory for the spallation neutron source (SNS) at Oak Ridge have been installed and are now operational. Each unit is capable of delivering pulses up to 11 MW peak, 1 average power voltages 140 kV drive klystron(s) rated 5 MW. To date, three variations basic design installed, each optimized deliver a specific klystron load configuration, total fifteen...
RF Test Facility (RFTF) has been constructed to support present and future needs in testing, processing conditioning of various high power components normal conducting superconducting systems at the SNS. The facility is expected have additional subsystems that are needed for complete (SRF) testing processing. A full capacity voltage converter modulator (HVCM) with 11 MW peak 8% duty cycle installed driving one or two klystron amplifiers. waveguides completed WR-2100 WR-1150 402.5 MHz 805...
The High Voltage Converter Modulator (HVCM) systems at the Spallation Neutron Source (SNS) are primary power sources for klystrons that supply RF to H-beam. availability of HVCMs exceeds 99% due numerous improvements have been implemented since SNS operations began in 2006. However, continue operate open-loop mode results significant voltage droop within each pulse. Control margin low-level control system is becoming a limitation as beam intensity and pulse length increased raise on target...
This paper discusses the topology used in HVCMs at SNS to process power for both cold and warm linac sections of klystron gallery support extended operations megawatt level. In anticipation a second target station higher anticipated levels, an enhancement present is being investigated. SPICE circuit simulations preliminary experimental data will be presented.
The High Voltage Convertor Modulators are used to power the RF klystrons throughout linear accelerator at Spallation Neutron Source. output voltage of modulator has significant droop and ripple which, combined with low level system limitations, affect performance stability cavities. In conjunction progress in development new controller, different modulation techniques were implemented studied on test rated 75 kV, 125 A. This paper presents experimental results from implementation frequency...
The SNS at ORNL has been fully operational since 2006 and in September 2009, the design goal of 1 MW sustained beam power on target was achieved. Historically, high voltage converter modulators (HVCM) have a known problem area and, order to reach another milestone ≥90% availability, new gate driver one several areas targeted improve overall reliability HVCM systems. drive capability fault protection large IGBT modules were specifically addressed switching characteristics provide enhanced...
The Proton Power Upgrade (PPU) project at SNS is planned to accelerate 38 mA of beam current 1.3 GeV, effectively doubling the accelerator power capability support an upgraded First Target Station and a Second [1]. This requires three additional modulators 28 700 kW klystrons associated high beta cavities. An alternate topology voltage converter modulator (AT-HVCM) has been developed by modifying existing HVCMs series-stacking dual-function resonant/filter capacitors relocating them after...
Early fault detection and prognosis are crucial to ensure efficient safe operations of complex engineering systems such as the Spallation Neutron Source (SNS) its power electronics (high voltage converter modulators). Following an advanced experimental facility setup that mimics SNS operating conditions, authors successfully conducted 21 experiments, where precursors introduced in system a degree enough cause degradation waveform signals, but not reach real fault. Nine different machine...
The first-generation high frequency switching megawatt-class High Voltage Converter Modulators (HVCM) developed by Los Alamos National Laboratory for the Spallation Neutron Source (SNS) at Oak Ridge have been installed and are now operational. Each unit is capable of delivering pulses up to 11 MW peak, 1 average power voltages 140 kV drive klystron(s) rated 5 MW. To date, three variations basic design installed, each optimized deliver a specific klystron load configuration. Design...
The high frequency switching megawatt-class High Voltage Converter Modulator (HVCM) developed by Los Alamos National Laboratory for the Oak Ridge Laboratory's Spallation Neutron Source (SNS) is now in operation. One of major problems with modulator systems shoot-thru conditions that can occur an IGBT H-bridge topology resulting large fault currents and device failure a few microseconds. Dynamic Fault Detection Chassis (DFDC) monitoring system. It monitors transformer flux saturation using...
The High Voltage Converter Modulators (HVCMs) are used to power the RF klystrons throughout accelerator systems at Spallation Neutron Source (SNS). output voltage of HVCM has significant droop and ripple which, combined with low level (LLRF) system limitations, affect performance efficiency cavities. In conjunction progress in development new controller, different pulse modulation techniques were implemented studied on test modulator. This paper discusses results implementation frequency...
The proposed Second Target Station (STS) increases the beam energy at SNS to 1.3 GeV by adding 7 additional cryomodules (28 cavities) end of existing linear accelerator. To achieve required gradients, these cavities will be powered with up 700 kW peak power utilizing upgraded 550 klystrons. meet needs, an enhancement present High Voltage Converter Modulator (HVCM) topology is being investigated. A discussion benefits derived from this alternate combined experimental data a prototype SNS.
This paper presents real operational data collected from the power systems of Spallation Neutron Source facility, which provides most intense neutron beam in world. The authors have used a radio-frequency test facility (RFTF) and simulated system failures lab without causing catastrophic failure. Waveform signals been RFTF normal operation as well during fault induction efforts. dataset significant amount faulty for training statistical or machine learning models. Then, performed 21...