SNS LEBT Chopper improvements

Saethre, R.; Peplov, V.V.

doi:10.1109/ipmhvc.2012.6518842

Cited by 5 publications

(5 citation statements)

References 2 publications

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“…As discussed in [3], failures of the MOSFET switches and blocking diodes in the pulser were correlated to arcing in the LEBT structure. Four major changes were made in 2011: reduced arc rate, improved voltage sharing, improved voltage clamping and modified gate latching [3].…”

Section: Protection Of Mosfet Switchmentioning

confidence: 98%

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Rise/fall time enhancement of the spallation neutron source Linac LEBT chopper system

Peplov

Saethre

2013

2013 19th IEEE Pulsed Power Conference (PPC)

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The Spallation Neutron Source (SNS) Linac Low Energy Beam Transport (LEBT) chopper system provides fast chopping of the H -ion beam in the LEBT structure. Four identical pulsed power supplies (pulsers) create a series of ± 2.5 kV pulses to the four deflection electrodes floating on the focusing voltage of -50 kV. Each pulser is connected to the electrode through the network which consists of high voltage (HV) cables, a blocking capacitor, HV feed-through connectors, current-limiting resistors and transient voltage suppressors. Effective beam chopping requires minimal rise/fall time of the rectangular HV pulses on the load. In the present configuration these values are approximately 100 ns. Methods of reducing rise/fall time on the LEBT electrodes are discussed. Results of simulation and comparative measurements of the original and upgraded system on the test stand are presented. Furthermore, the effect of these changes on reliability degradation caused by arcing in the LEBT structure is discussed.

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Section: Protection Of Mosfet Switchmentioning

confidence: 98%

“…Four major changes were made in 2011: reduced arc rate, improved voltage sharing, improved voltage clamping and modified gate latching [3]. These upgrades resulted in zero switch failures during last two years operation.…”

Section: Protection Of Mosfet Switchmentioning

confidence: 99%

Rise/fall time enhancement of the spallation neutron source Linac LEBT chopper system

Peplov

Saethre

2013

2013 19th IEEE Pulsed Power Conference (PPC)

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Section: Protection Of Mosfet Switchmentioning

confidence: 98%

“…As a result, multiple changes have been designed to mitigate these failures. The results of study and upgrades have been described in [3]. Since the upgrades were implemented in 2011, there have been no pulser failures, allowing further work on rise/fall time improvement.…”

Section: A Historymentioning

confidence: 99%

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Rise/fall time enhancement of the spallation neutron source linac LEBT chopper system

Peplov¹,

Saethre²

2013

2013 Abstracts IEEE International Conference on Plasma Science (ICOPS)

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The Spallation Neutron Source (SNS) Linac Low Energy Beam Transport (LEBT) chopper system provides fast chopping of the Hion beam in the LEBT structure. Four identical pulsed power supplies (pulsers) create a series of ± 3.0 kV pulses to the four deflection electrodes floating on the focusing voltage of -45kV. Each pulser is connected to the electrode through the network which consists of high voltage (HV) cab les, a blocking capacitor, HV feed-through connectors, current-limiting resistors and transient voltage suppressors. Effect ive beam chopping requires minimal rise/fall t imes of the rectangular HV pulses on the load. In the present configuration these values are approximately 130-140 ns. Methods of reducing rise/fall t imes on the LEBT electrodes are discussed. Results of simulation and comparative measurements of the old and upgraded system on the test stand are presented. Furthermore, the effect of these changes on reliability degradation caused by arcing in the LEBT structure is discussed. 1 1. Robert B. Saethre, Vladimir V. Peplov, " SNS LEBT

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Performance of High Voltage Bipolar Pulse Generator with Fast Push-Pull Solid-State Switch Modules

Peplov

Saethre

2018

2018 IEEE International Power Modulator and High Voltage Conference (IPMHVC)

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SNS LEBT Chopper improvements

Cited by 5 publications

References 2 publications

Rise/fall time enhancement of the spallation neutron source Linac LEBT chopper system

Rise/fall time enhancement of the spallation neutron source Linac LEBT chopper system

Rise/fall time enhancement of the spallation neutron source linac LEBT chopper system

Performance of High Voltage Bipolar Pulse Generator with Fast Push-Pull Solid-State Switch Modules

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