Experimental results from droop compensation for the high voltage converter modulators

Gunjan P. Patel; David E. Anderson; Vladimir V. Peplov; Robert B. Saethre; Dennis J. Solley; Mark W. Wezensky

doi:10.1109/TDEI.2013.6571422

Experimental results from droop compensation for the high voltage converter modulators

Gunjan P. Patel, David E. Anderson, Vladimir V. Peplov, Robert B. Saethre, Dennis J. Solley, Mark W. Wezensky

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

The High Voltage Convertor Modulators are used to power the RF klystrons used throughout the linear accelerator at the Spallation Neutron Source. The output voltage of the modulator has significant voltage droop and ripple which, combined with low level RF system limitations, affect performance and stability of the accelerator cavities. In conjunction with the progress in the development of the new controller, different modulation techniques were implemented and studied on the test modulator rated at 75 kV, 125 A. This paper presents experimental results from implementation of frequency sweep, phase sweep and combined phase and frequency sweep modulation on the modulator output voltage pulse. Thermal measurements were carried out to determine the effect of these modulations schemes on long term reliability of the modulator. Future plans are also discussed.

Original language	English
Article number	6571422
Pages (from-to)	1093-1100
Number of pages	8
Journal	IEEE Transactions on Dielectrics and Electrical Insulation
Volume	20
Issue number	4
DOIs	https://doi.org/10.1109/TDEI.2013.6571422
State	Published - 2013
Externally published	Yes

Keywords

Accelerators
insulated gate bipolar transistors
losses
pulse width modulation
reliability
resonant power conversion

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10.1109/TDEI.2013.6571422

Cite this

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title = "Experimental results from droop compensation for the high voltage converter modulators",

abstract = "The High Voltage Convertor Modulators are used to power the RF klystrons used throughout the linear accelerator at the Spallation Neutron Source. The output voltage of the modulator has significant voltage droop and ripple which, combined with low level RF system limitations, affect performance and stability of the accelerator cavities. In conjunction with the progress in the development of the new controller, different modulation techniques were implemented and studied on the test modulator rated at 75 kV, 125 A. This paper presents experimental results from implementation of frequency sweep, phase sweep and combined phase and frequency sweep modulation on the modulator output voltage pulse. Thermal measurements were carried out to determine the effect of these modulations schemes on long term reliability of the modulator. Future plans are also discussed.",

keywords = "Accelerators, insulated gate bipolar transistors, losses, pulse width modulation, reliability, resonant power conversion",

author = "Patel, {Gunjan P.} and Anderson, {David E.} and Peplov, {Vladimir V.} and Saethre, {Robert B.} and Solley, {Dennis J.} and Wezensky, {Mark W.}",

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AU - Patel, Gunjan P.

AU - Anderson, David E.

AU - Peplov, Vladimir V.

AU - Saethre, Robert B.

AU - Solley, Dennis J.

AU - Wezensky, Mark W.

PY - 2013

Y1 - 2013

N2 - The High Voltage Convertor Modulators are used to power the RF klystrons used throughout the linear accelerator at the Spallation Neutron Source. The output voltage of the modulator has significant voltage droop and ripple which, combined with low level RF system limitations, affect performance and stability of the accelerator cavities. In conjunction with the progress in the development of the new controller, different modulation techniques were implemented and studied on the test modulator rated at 75 kV, 125 A. This paper presents experimental results from implementation of frequency sweep, phase sweep and combined phase and frequency sweep modulation on the modulator output voltage pulse. Thermal measurements were carried out to determine the effect of these modulations schemes on long term reliability of the modulator. Future plans are also discussed.

AB - The High Voltage Convertor Modulators are used to power the RF klystrons used throughout the linear accelerator at the Spallation Neutron Source. The output voltage of the modulator has significant voltage droop and ripple which, combined with low level RF system limitations, affect performance and stability of the accelerator cavities. In conjunction with the progress in the development of the new controller, different modulation techniques were implemented and studied on the test modulator rated at 75 kV, 125 A. This paper presents experimental results from implementation of frequency sweep, phase sweep and combined phase and frequency sweep modulation on the modulator output voltage pulse. Thermal measurements were carried out to determine the effect of these modulations schemes on long term reliability of the modulator. Future plans are also discussed.

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KW - insulated gate bipolar transistors

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Experimental results from droop compensation for the high voltage converter modulators

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