2011 Particle Accelerator Conference - Classification: Accelerator Technology / Tech 16: Pulsed Power Technology

Paper	Title	Page
TUP130	Experiments on Voltage Droop Compensation for High Power Marx Modulators	1076
	P. Chen, M. Lundquist, D. Yu DULY Research Inc., Rancho Palos Verdes, California, USA
	Funding: Work supported by DOE SBIR Phase II grant DE-FG02-08ER85052 Marx modulators, promising higher efficiency, longer lifetime and reduced cost compared with existing hard tube modulator options, are under intensive research. In this article, we describe the progress of work on our voltage droop compensation scheme for a Marx modulator. Experimental results on a compensation circuit at moderate voltage are presented.

TUP213	Research and Development toward the RHIC Injection Kicker Upgrade	1211
	W. Zhang, W. Fischer, H. Hahn, C. Pai, J. Sandberg, J.E. Tuozzolo BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. A research and development work is on going toward the upgrade of the RHIC Injection Fast Kicker System. We report here the proposed nano-second pulse generator, the initial test result, the options of the deflector design, injection pattern, and the benefit to the future RHIC programs.

TUP253	AGS Tune Jump Power Supply Design and Test	1298
	J.-L. Mi, J.W. Glenn, H. Huang, I. Marneris, P.J. Rosas, J. Sandberg, Y. Tan, W. Zhang BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. A horizontal tune jump system has been installed to overcome the horizontal intrinsic spin resonances, which requires jumping the horizontal tune 0.04 units 82 times, 41 up and 41 down. Two quadruple magnets have been installed in AGS ring to do this. The pulsed magnet currents range from about 140 amps near injection to about 1400 amps late. Current pulse rise and fall times are around 100 micro-sec and flat tops time are around 4mS. These quadruples have separate supplies. This tune jump pulse power supply employees all semiconductor parts as the main switches. During dummy load and magnet testing, the test result showed that the power supply could meet the specification. This article will describe some detail of power supply simulation, design and testing. Some test waveform and pictures are presented in this paper.

TUP254	Real Time Monitoring of the Power Limit Resistor in the Boost Injection Kicker Power Supply	1301
	J.-L. Mi, J. Sandberg, Y. Tan, W. Zhang BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. After years of suffering Booster Injection Kicker transistor bank driver regulator trouble shooting, a new real time monitor system has been developed. A simple and floating circuit has been designed and tested. This circuit monitor system can real time monitor the driver regulator power limit resistor status and warn machine operators if the power limit resistor changes values. This paper will introduce the power supply mainly and the new designed monitoring system.

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.

TUP259	A Solid-State Nanosecond Beam Kicker Modulator Based on the DSRD Switch	1310
	A.L. Benwell, R. Akre, C. Burkhart, A. Krasnykh, T. Tang SLAC, Menlo Park, California, USA A. Kardo-Sysoev IOFFE, St. Petersburg, Russia
	Funding: Work supported by the U.S. Department of Energy under contract DE-AC02-76SF00515 A fast solid-state beam kicker modulator is under development at the SLAC National Accelerator Laboratory. The program goal is to develop a modulator that will deliver 4 ns, ±5 kV pulses to the ATF2 damping ring beam extraction kicker. The kicker is a 50 Ω, bipolar strip line, 60 cm long, fed at the downstream end and terminated at the upstream end. The bunch spacing in the ring is 5.6 ns, bunches are removed from the back end of the train, and there is a gap of 10³.6 ns before the next train. The modulator design is based on an opening switch topology that uses Drift Step Recovery Diodes as the opening switches. The design and results of the modulator development are discussed.

TUP261	The ILC P2 Marx and Application of the Marx Topology to Future Accelerators	1313
	M.A. Kemp, A.L. Benwell, C. Burkhart, J. Hugyik, R.S. Larsen, D.J. MacNair, K.J.P. Macken, M.N. Nguyen, J.J. Olsen SLAC, Menlo Park, California, USA
	Funding: Work supported by the US Department of Energy under contract DE-AC02-76SF00515. The SLAC P2 Marx is under development for the ILC linac klystron modulator. Specifications are for an output of 120 kV, 140 A, 1.6 ms pulse width, 5 Hz pulse repetition frequency, and ± 0.5% flat-top. The SLAC P2 Marx builds upon the success of the P1 Marx, which is currently undergoing lifetime evaluation. While the P2 Marx’s target application is the ILC, characteristics of the Marx topology make it equally well-suited for different parameter ranges; for example, increased pulse repetition frequency, increased output current, longer pulse width, etc. Marx parameters such as the number of cells, cell capacitance, and component selection can be optimized for the application. This paper provides an overview of the P2 Marx development including design, fabrication progress, and test results for the modulator and sub-assemblies. High-availability features of the modulator such as the diagnostic/prognostic embedded control system and fault-adaptive automatic reconfiguration will be detailed. In addition, the scalability of the Marx topology to other long-pulse parameter ranges will be highlighted. Topology adaptations for several proposed accelerators will be presented.

Paper

Title

Page

Experiments on Voltage Droop Compensation for High Power Marx Modulators

1076

P. Chen, M. Lundquist, D. Yu
DULY Research Inc., Rancho Palos Verdes, California, USA

Funding: Work supported by DOE SBIR Phase II grant DE-FG02-08ER85052
Marx modulators, promising higher efficiency, longer lifetime and reduced cost compared with existing hard tube modulator options, are under intensive research. In this article, we describe the progress of work on our voltage droop compensation scheme for a Marx modulator. Experimental results on a compensation circuit at moderate voltage are presented.

TUP213

Research and Development toward the RHIC Injection Kicker Upgrade

1211

W. Zhang, W. Fischer, H. Hahn, C. Pai, J. Sandberg, J.E. Tuozzolo
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
A research and development work is on going toward the upgrade of the RHIC Injection Fast Kicker System. We report here the proposed nano-second pulse generator, the initial test result, the options of the deflector design, injection pattern, and the benefit to the future RHIC programs.

TUP253

AGS Tune Jump Power Supply Design and Test

1298

J.-L. Mi, J.W. Glenn, H. Huang, I. Marneris, P.J. Rosas, J. Sandberg, Y. Tan, W. Zhang
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
A horizontal tune jump system has been installed to overcome the horizontal intrinsic spin resonances, which requires jumping the horizontal tune 0.04 units 82 times, 41 up and 41 down. Two quadruple magnets have been installed in AGS ring to do this. The pulsed magnet currents range from about 140 amps near injection to about 1400 amps late. Current pulse rise and fall times are around 100 micro-sec and flat tops time are around 4mS. These quadruples have separate supplies. This tune jump pulse power supply employees all semiconductor parts as the main switches. During dummy load and magnet testing, the test result showed that the power supply could meet the specification. This article will describe some detail of power supply simulation, design and testing. Some test waveform and pictures are presented in this paper.

TUP254

Real Time Monitoring of the Power Limit Resistor in the Boost Injection Kicker Power Supply

1301

J.-L. Mi, J. Sandberg, Y. Tan, W. Zhang
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
After years of suffering Booster Injection Kicker transistor bank driver regulator trouble shooting, a new real time monitor system has been developed. A simple and floating circuit has been designed and tested. This circuit monitor system can real time monitor the driver regulator power limit resistor status and warn machine operators if the power limit resistor changes values. This paper will introduce the power supply mainly and the new designed monitoring system.

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.

TUP259

A Solid-State Nanosecond Beam Kicker Modulator Based on the DSRD Switch

1310

A.L. Benwell, R. Akre, C. Burkhart, A. Krasnykh, T. Tang
SLAC, Menlo Park, California, USA
A. Kardo-Sysoev
IOFFE, St. Petersburg, Russia

Funding: Work supported by the U.S. Department of Energy under contract DE-AC02-76SF00515
A fast solid-state beam kicker modulator is under development at the SLAC National Accelerator Laboratory. The program goal is to develop a modulator that will deliver 4 ns, ±5 kV pulses to the ATF2 damping ring beam extraction kicker. The kicker is a 50 Ω, bipolar strip line, 60 cm long, fed at the downstream end and terminated at the upstream end. The bunch spacing in the ring is 5.6 ns, bunches are removed from the back end of the train, and there is a gap of 10³.6 ns before the next train. The modulator design is based on an opening switch topology that uses Drift Step Recovery Diodes as the opening switches. The design and results of the modulator development are discussed.

TUP261

The ILC P2 Marx and Application of the Marx Topology to Future Accelerators

1313

M.A. Kemp, A.L. Benwell, C. Burkhart, J. Hugyik, R.S. Larsen, D.J. MacNair, K.J.P. Macken, M.N. Nguyen, J.J. Olsen
SLAC, Menlo Park, California, USA

Funding: Work supported by the US Department of Energy under contract DE-AC02-76SF00515.
The SLAC P2 Marx is under development for the ILC linac klystron modulator. Specifications are for an output of 120 kV, 140 A, 1.6 ms pulse width, 5 Hz pulse repetition frequency, and ± 0.5% flat-top. The SLAC P2 Marx builds upon the success of the P1 Marx, which is currently undergoing lifetime evaluation. While the P2 Marx’s target application is the ILC, characteristics of the Marx topology make it equally well-suited for different parameter ranges; for example, increased pulse repetition frequency, increased output current, longer pulse width, etc. Marx parameters such as the number of cells, cell capacitance, and component selection can be optimized for the application. This paper provides an overview of the P2 Marx development including design, fabrication progress, and test results for the modulator and sub-assemblies. High-availability features of the modulator such as the diagnostic/prognostic embedded control system and fault-adaptive automatic reconfiguration will be detailed. In addition, the scalability of the Marx topology to other long-pulse parameter ranges will be highlighted. Topology adaptations for several proposed accelerators will be presented.