IPAC2015 - List of Authors (Kempkes, M.K.)

Paper	Title	Page
WEPTY042	Pulsed Power Systems for ESS Klystrons	3368
	M.P.J. Gaudreau, M.K. Kempkes, I. Roth Diversified Technologies, Inc., Bedford, Massachusetts, USA P.A. Dupire Sigma Phi Electronics, Wissembourg, France J.D. Holzmann Sigmaphi, Vannes, France
	Funding: DE-SC0004254 Under an SBIR from DOE, Diversified Technologies, Inc. (DTI) has designed and built an advanced, high-voltage solid-state modulator for long pulse klystrons for ESS. In 2014, DTI, in partnership with SigmaPhi Electronics, received two contracts for production and installation of this design for ESS-class modulators, which will be used for the testing and conditioning of ESS klystron tubes and testing of RF components. This modulator design uses a hybrid configuration (solid state switch and pulse transformer) with an advanced switching regulator to maintain a very flat voltage into the klystron over multi-millisecond pulses. This paper will describe the design and testing of these modulators, and the status of their installation. The major development introduced in this design is that the millisecond-long pulses produce a droop voltage of about 10% with a reasonably-sized capacitor bank–much larger than the 1% droop required. To eliminate the droop without a large and expensive capacitor bank, the modulator uses a non-dissipative regulator.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY042
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WEPTY043	Short Pulse Marx Modulator	3370
	R.A. Phillips, M.P.J. Gaudreau, M.K. Kempkes, B.E. Simpson Diversified Technologies, Inc., Bedford, Massachusetts, USA J.A. Casey Rockfield Research Inc., Las Vegas, Nevada, USA
	Funding: DE-SC0004251 High energy, short-pulse modulators are being re-examined for the Compact Linear Collider (CLIC) and numerous X-Band accelerator designs. At the very high voltages required for these systems, all of the existing designs are based on pulse transformers, which significantly limit their performance and efficiency. There is not a fully optimized, transformer-less modulator design capable of meeting the demanding requirements of very high voltage pulses at short pulse widths. Under a U.S. Department of Energy grant, Diversified Technologies, Inc. (DTI) has completed development of a short pulse, solid-state Marx modulator. The modulator is designed for high efficiency in the 100 kV to 500 kV range, for currents up to 250 A, pulse lengths of 0.2 to 5.0 μs, and risetimes <300 ns. Key objectives of the development effort were modularity and scalability, combined with low cost and ease of manufacture. For short-pulse modulators, this Marx topology provides a means to achieve fast risetimes and flattop control that are not available with hard switch or transformer-coupled topologies.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY043
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Pulsed Power Systems for ESS Klystrons

3368

M.P.J. Gaudreau, M.K. Kempkes, I. Roth
Diversified Technologies, Inc., Bedford, Massachusetts, USA
P.A. Dupire
Sigma Phi Electronics, Wissembourg, France
J.D. Holzmann
Sigmaphi, Vannes, France

Funding: DE-SC0004254
Under an SBIR from DOE, Diversified Technologies, Inc. (DTI) has designed and built an advanced, high-voltage solid-state modulator for long pulse klystrons for ESS. In 2014, DTI, in partnership with SigmaPhi Electronics, received two contracts for production and installation of this design for ESS-class modulators, which will be used for the testing and conditioning of ESS klystron tubes and testing of RF components. This modulator design uses a hybrid configuration (solid state switch and pulse transformer) with an advanced switching regulator to maintain a very flat voltage into the klystron over multi-millisecond pulses. This paper will describe the design and testing of these modulators, and the status of their installation. The major development introduced in this design is that the millisecond-long pulses produce a droop voltage of about 10% with a reasonably-sized capacitor bank–much larger than the 1% droop required. To eliminate the droop without a large and expensive capacitor bank, the modulator uses a non-dissipative regulator.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY042

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPTY043

Short Pulse Marx Modulator

3370

R.A. Phillips, M.P.J. Gaudreau, M.K. Kempkes, B.E. Simpson
Diversified Technologies, Inc., Bedford, Massachusetts, USA
J.A. Casey
Rockfield Research Inc., Las Vegas, Nevada, USA

Funding: DE-SC0004251
High energy, short-pulse modulators are being re-examined for the Compact Linear Collider (CLIC) and numerous X-Band accelerator designs. At the very high voltages required for these systems, all of the existing designs are based on pulse transformers, which significantly limit their performance and efficiency. There is not a fully optimized, transformer-less modulator design capable of meeting the demanding requirements of very high voltage pulses at short pulse widths. Under a U.S. Department of Energy grant, Diversified Technologies, Inc. (DTI) has completed development of a short pulse, solid-state Marx modulator. The modulator is designed for high efficiency in the 100 kV to 500 kV range, for currents up to 250 A, pulse lengths of 0.2 to 5.0 μs, and risetimes <300 ns. Key objectives of the development effort were modularity and scalability, combined with low cost and ease of manufacture. For short-pulse modulators, this Marx topology provides a means to achieve fast risetimes and flattop control that are not available with hard switch or transformer-coupled topologies.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY043

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)