2011 Particle Accelerator Conference - List of Authors (Kempkes, M.K.)

Paper	Title	Page
TUP255	Solid-State Transmitter for a 2 MW Klystron	1304
	M.K. Kempkes, M.P.J. Gaudreau, T.H. Hawkey, K. Schrock Diversified Technologies, Inc., Bedford, Massachusetts, USA
	Diversified Technologies, Inc. delivered a transmitter for a 2 MW, 500 MHz klystron manufactured by Communications and Power Industries, Inc. The transmitter design eliminates the need for a large pulse transformer; eliminates the crowbar for greater system availability and klystron reliability, and provides full control and monitoring of critical transmitter functions, settings, and fault diagnostics. The klystron beam power is generated by two high voltage power supplies, each capable of producing 150 kW CW power at 100 kV, with ~0.1% regulation. The transmitter can operate at lower average power in the unlikely event a single power supply goes off-line. The main solid-state switch, a series stack of commercially available IGBTs, delivers a range of HV pulsewidths to the klystron under normal operating conditions, and protects the klystron against arc damage. Should the current in the switch exceed a preset fault threshold value, the switch opens in ~ 1 μs to disconnect the high voltage from the klystron. In this paper, DTI will describe the architecture of the 2 MW klystron transmitter and its present status.

TUP256	Affordable, Short Pulse Marx Modulator	1307
	M.K. Kempkes, J.A. Casey, M.P.J. Gaudreau, R.A. Phillips Diversified Technologies, Inc., Bedford, Massachusetts, USA J. Casey Rockfield Research, Inc. east, Winchester, Massachusetts, USA
	Funding: U.S. Department of Energy Under a U.S. Department of Energy grant, Diversified Technologies, Inc. (DTI) is developing 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 500 A, pulse lengths of 0.2 to 5.0 μs, and risetimes <300 ns. Key objectives of the development effort are modularity and scalablity, 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 simply not available with hard switch or transformer-coupled topologies. In this paper, DTI will describe the new design and provide an update on progress.

Paper

Title

Page

Solid-State Transmitter for a 2 MW Klystron

1304

M.K. Kempkes, M.P.J. Gaudreau, T.H. Hawkey, K. Schrock
Diversified Technologies, Inc., Bedford, Massachusetts, USA

Diversified Technologies, Inc. delivered a transmitter for a 2 MW, 500 MHz klystron manufactured by Communications and Power Industries, Inc. The transmitter design eliminates the need for a large pulse transformer; eliminates the crowbar for greater system availability and klystron reliability, and provides full control and monitoring of critical transmitter functions, settings, and fault diagnostics. The klystron beam power is generated by two high voltage power supplies, each capable of producing 150 kW CW power at 100 kV, with ~0.1% regulation. The transmitter can operate at lower average power in the unlikely event a single power supply goes off-line. The main solid-state switch, a series stack of commercially available IGBTs, delivers a range of HV pulsewidths to the klystron under normal operating conditions, and protects the klystron against arc damage. Should the current in the switch exceed a preset fault threshold value, the switch opens in ~ 1 μs to disconnect the high voltage from the klystron. In this paper, DTI will describe the architecture of the 2 MW klystron transmitter and its present status.

TUP256

Affordable, Short Pulse Marx Modulator

1307

M.K. Kempkes, J.A. Casey, M.P.J. Gaudreau, R.A. Phillips
Diversified Technologies, Inc., Bedford, Massachusetts, USA
J. Casey
Rockfield Research, Inc. east, Winchester, Massachusetts, USA

Funding: U.S. Department of Energy
Under a U.S. Department of Energy grant, Diversified Technologies, Inc. (DTI) is developing 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 500 A, pulse lengths of 0.2 to 5.0 μs, and risetimes <300 ns. Key objectives of the development effort are modularity and scalablity, 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 simply not available with hard switch or transformer-coupled topologies. In this paper, DTI will describe the new design and provide an update on progress.