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Kempkes, M. K.

Paper Title Page
WEPMN113 A High Voltage Hard Switch Modulator for the International Linear Collider 2301
 
  • M. K. Kempkes, M. P.J. Gaudreau, I. Roth, R. P. Torti
    Diversified Technologies, Inc., Bedford, Massachusetts
  
  Under the U. S. DOE SBIR program, Diversified Technologies, Inc. (DTI) is developing a modulator to supply 135 kV, 165A, 1.5 ms pulses for the International Linear Collider. The hard-switch modulator, using DTI?s solid-state switches, will accommodate the long pulse-length required by the L-band (1.3 GHz) klystrons. To achieve required pulse flatness (0.5% at 5 Hz) without a large capacitor bank, a bouncer circuit is used to compensate the voltage droop. An LC ringer, switched separately from the main HV capacitor bank, is employed. The main storage capacitor is charged by a 185 kW DTI inverter driving a four-stage voltage multiplier. The bouncer capacitor is charged by a commercial high voltage supply. A multi-stage, high voltage switch connects the main capacitor to the load during the linear portion of the bouncer ringing transient. The inverter transformers, multiplier, bouncer inductor, capacitor, high voltage switches, main capacitor bank (90kJ), and voltage and current diagnostic probes are completely housed in oil-filled tanks. This paper describes the structure and operating theory of this switching system, and reports on its construction and initial testing.  
WEPMN114 Modular Multiple Frequency RF Amplifier 2304
 
  • M. K. Kempkes, M. P.J. Gaudreau, J. Kinross-Wright, I. Roth
    Diversified Technologies, Inc., Bedford, Massachusetts
  
  The construction and support of a wide range of RF amplifiers are significant cost components in the operation of the research community's accelerator facilities. This situation exists because amplifiers have been designed for a single application, often by multiple vendors, and therefore have very little commonality in their design, construction, and control interfaces for remote operation. To address these shortcomings, Diversified Technologies, Inc. (DTI) is developing a versatile and cost effective, modular RF amplifier design that can be employed across a wide range of RF amplifier requirements. Regardless of frequency or power, amplifiers built on this model feature commonality of design, controls system, and spares. A marriage of solid-state RF driver, power conditioning and control circuitry with high power Vacuum Electronic Device (VED) power amplifiers provide the ultimate in modular, cost-effective, and re-configurable RF power sources. In this paper, DTI will describe the modular RFA amplifier's topology and operating theory, and progress to date in the development of a prototype.  
THOBKI02 Marx Bank Technology for the International Linear Collider 2590
 
  • M. K. Kempkes, F. O. Arntz, J. A. Casey, M. P.J. Gaudreau, I. Roth
    Diversified Technologies, Inc., Bedford, Massachusetts
  
  In August, 2004, the international science community formally backed the development of a superconducting linear accelerator named the International Linear Collider (ILC). It is expected that the accelerator will employ klystrons operating in the range of 110-135 kV, 120-166 A, and 1.5 ms pulsewidth. Due to the accelerator's long pulse length and high power, focusing on power supply and energy storage alternatives promises to yield significant reductions in acquisition costs. Diversified Technologies, Inc. (DTI) has developed a high power, solid-state Marx Bank topology, offering an optimal, silicon-efficient technology for the ILC modulators and power supplies. We estimate the Marx topology can deliver equivalent performance and yield acquisition cost savings of 25-50% versus presently proposed alternatives. In this paper DTI will describe the Marx based technology as it is applied to ILC power systems design, and review recent progress in the engineering of the prototype transmitter.  
THPMN111 A Kicker Driver for the International Linear Collider 2972
 
  • M. K. Kempkes, F. O. Arntz, M. P.J. Gaudreau
    Diversified Technologies, Inc., Bedford, Massachusetts
  • A. Kardo-Sysoev
    IOFFE, St. Petersburg
  • A. Krasnykh
    SLAC, Menlo Park, California
  
  Diversified Technologies, Inc. (DTI), under a SBIR grant from the U. S. Department of Energy, is developing a driver for a kicker strip-line deflector which inserts and extracts charge bunches to and from the electron and positron damping rings of the International Linear Collider. The deflector requires a driver capable of 10 kV, 200 A pulses of 2 ns duration, after-pulse clamping of the deflector voltage to less than one volt within six nanoseconds, and must function at burst rates of 3 to 6 MHz. The driver must also effectively absorb high-order mode signals emerging from the deflector itself. In this paper, DTI will describe a promising approach to the design of the kicker driver involving high voltage DSRDs (Drift Step Recovery Diodes) and high voltage MOSFETs. In addition, our design approach to meeting the challenges posed by the ILC requirements will be discussed.