The U.S. Spallation Neutron Source (SNS) is a state-of-the-art neutron scattering facility delivering the world's most intense pulsed beams to wide array of instruments, which are used conduct investigations in many fields engineering, physics, chemistry, material science, and biology. Neutrons produced by spallation liquid Hg bombardment short (∼1 µs), (∼35 A) pulses protons delivered at 60 Hz an accumulator ring fed high-intensity, 1 GeV, H- LINAC (linear accelerator). This has operated...

A research team from the Lawrence Livermore National Laboratory and Bechtel Nevada Corporation is developing an all solid-state power source for high-current induction accelerators. The original system design, developed heavy-ion fusion accelerators, based on simple idea of using array field effect transistors (FETs) to switch energy a pre-charged capacitor bank accelerator cell. Recently, that has been expanded accommodate greater needs new class electron accelerators advanced radiography....

The Spallation Neutron Source (SNS) linac beam shall be chopped in the manner which supports accumulation of protons accumulating ring and assures low loss activation free extraction charged particles from to SNS target. Low Energy Beam Transport (LEBT) Chopper System uses four identical pulsed power supplies (pulsers) create required series bipolar HV pulses. Each pulser a +/- 3 kV pulse or ground an electrostatic einzel lens split into quadrants deflect for 200 ns 1 us. Timing provides...

The Low Energy Beam Transport (LEBT) Chopper for the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory has experienced failures of power semiconductors within tri-state pulsed supplies. These supplies deliver a +/- 3 kV pulse or ground potential to an electrostatic einzel lens split into four quadrants deflect beam 200 ns 1 us. are ac coupled -50 dc supply steering offset lens. This paper discusses failure modes and improvements mitigate future failures.

The Spallation Neutron Source (SNS) extraction kicker system is a high power 60 hertz pulsed system. [1] consists of fourteen identical modulators, each driving magnet to extract proton beam from the accumulator ring through transfer line target. Each modulator Blumlein Pulse Forming Network (PFN) with fast current switching thyratron and low inductance capacitor banks. switches have relatively short life times, replacement cost, long lead-time require routine adjustments maintain timing...

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 Spallation Neutron Source (SNS) extraction kicker system is a high power 60 hertz pulsed [1]. consists of fourteen identical modulators, each driving magnet to extract proton beam from the accumulator ring through transfer line target. kickers are required reach maximum magnetic flux density during 200-250 ns gap in ring. Timing variations modulator and/or trigger could cause firing outside causing loss resulting residual activation and possible equipment damage. Each Blumlein Pulse...

The Spallation Neutron Source (SNS) Linac Low Energy Beam Transport (LEBT) chopper system provides fast chopping of the H <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-</sup> ion beam in LEBT structure. Four identical pulsed power supplies (pulsers) create a series ± 2.5 kV pulses to four deflection electrodes floating on focusing voltage -50 kV. Each pulser is connected electrode through network which consists high (HV) cables, blocking...

The Spallation Neutron Source (SNS) Linac Low Energy Beam Transport (LEBT) chopper system provides fast chopping of the H <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-</sup> ion beam in LEBT structure. Four identical pulsed power supplies (pulsers) create a series ± 3.0 kV pulses to four deflection electrodes floating on focusing voltage -45kV. Each pulser is connected electrode through network which consists high (HV) cables, blocking...

The U.S. Spallation Neutron Source (SNS) now operates with 1.2 MW of beam power on target the near-term goal delivering 1.4 and a longer-term >2 to support planned second station. Presently, H− pulses (50-60 mA, 1 ms, 60 Hz) from an RF-driven, Cs-enhanced, multi-cusp ion source are first accelerated 2.5 MeV by Radio Frequency Quadrupole (RFQ) accelerator, injected into ∼1 GeV linac, compressed <1μs in accumulator ring ultimately delivered liquid mercury for pulsed neutron production. In...

The Spallation Neutron Source (SNS) extraction kicker system is a high power 60Hz pulsed used to eject proton beam from the accumulator ring and transfer it mercury target. consists of 14 Blumlein pulse forming network (PFN) modulators that require precise timing synchronization fast rise times. Timing jitter can result in modulator potentially firing outside ideal time causing excessive loss. A commercial thyratron as voltage switching element PFN. Adjustments reservoir filament heater are...

Four identical pulsed power supplies (pulsers) produce a series of ± 2.5 kV pulses to four deflection electrodes the Spallation Neutron Source (SNS) Linac Low Energy Beam Transport (LEBT) beam chopping system. The pulsers are required 1MHz burst adjustable-duration with 60 Hz repetition frequency and rise fall times less than 50 ns into 200 pF load. have experienced many failures during last 8 years operation undergone significant upgrades. semiconductors, associated drive electronics timing...

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 Spallation Neutron Source (SNS) extraction kicker system is a high power 60 hertz pulsed system. <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sup> consists of fourteen identical modulators, each driving magnet to extract proton beam from the accumulator ring through transfer line target. kickers are required reach maximum magnetic flux density during 200-250 ns gap in ring. Timing variations modulator and/or trigger could cause firing...

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 Spallation Neutron Source (SNS) Proton Power Upgrade (PPU) will double the beam power from 1.4 to 2.8 MW by adding cavities in superconducting linear accelerator (SCL) which increase energy 0.97 1.3 GeV and increasing average linac current 26 38 mA. Provisions for an were made original SNS project, these are being leveraged provide a cost-effective means of doubling power. magnet systems originally designed higher energies except few injection extraction regions accumulator ring. Three...

The Cymer Master Oscillator Power Amplifier (MOPA)-based light source requires tight timing control over all operating repetition rates. newly developed IGBT gate driver allows of the IGBT's turn on/off jitter and drift. Its performance is significantly improved compared to previous driver. Switching rate improvement new reduces time spent in active switching region therefore helps reduce losses. These improvements allow for better triggering laser performance. This paper will provide...

Described is a system that will provide isolated electric power for circuit drives the core reset of pulsed modulator. This can be accomplished by coupling light from number diode laser bars to bundles 200 micrometers multimode optical fibers. then coupled photo- voltaic converters deliver 16 V 29 mA electricity 1 watt power. Spot size at bundle face Gaussian ellipse with major axis 0.9 mm radius and minor 0.118 maximum full angle divergence X 2.4 degrees. Data presented four 20 W 12 fibers...

Researchers at the Lawrence Livermore National Laboratory (LLNL) are developing a flexible, all solid-state pulsed power source that will enable an induction accelerator to produce multikiloampere electron beams maximum pulse repetition frequency (PRF) of 2 MHz. The prototype consists three, 15 kV, 4.8 kA modulators stacked in adder configuration. Each modulator contains over 1300 field-effect transistors (FETs) quickly connect and disconnect four banks energy storage capacitors magnetic...

In certain applications for excimer lasers, it is critical to maintain the timing of a solid state pulsed power module (SSPPM) such that output laser can be synchronized another external event. some cases, this synchronization must held times in order 10 ns or less. Since operating voltage range these magnetic modulators vary (by up factor two) adjust energy, throughput delay also significantly. This maintained over other possible conditions and scenarios, including various repetition rates,...

The Spallation Neutron Source (SNS) beam chopping system uses a segmented electrostatic lens in the Low Energy Beam Transport (LEBT) line to deflect out of Radio Frequency Quadrupole (RFQ) input aperture create gaps 1 ms macro-pulse for extraction from Ring, or fully displace beam. is split azimuthally into four quadrants which are pulsed independently by bipolar high voltage pulse generators. chopper timing control creates trigger pulses generators sequentially positions on target. In...