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Title: Solid-State Modulators for RF And Fast Kickers

Abstract

As the switching capabilities of solid-state devices increase, these devices are being incorporated into modulator designs for high voltage accelerator applications. Solid-state modulators based on inductive adder circuit topology have demonstrated great versatility with regard to pulse width and pulse repetition rate while maintaining fast pulse rise and fall times. Additionally, these modulators are capable of being scaled to higher output voltage and power levels. An explanation of the basic circuit operation will be presented as well as test data of several different hardware systems.

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
877443
Report Number(s):
SLAC-PUB-11759
TRN: US0601437
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Prepared for Particle Accelerator Conference (PAC 05), Knoxville, Tennessee, 16-20 May 2005
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; MODULATION; KICKER MAGNETS; RF SYSTEMS; DESIGN; OPERATION; Accelerators,ACCPHY

Citation Formats

Cook, E.G., Akana, G.L., Gower, E.J., Hawkins, S.A., Hickman, B.C., /LLNL, Livermore, Brooksby, C.A., /NONE - BECHTEL NEVADA LAS VEGAS, Cassel, R.L., de Lamare, J.E., Nguyen, M.N., Pappas, G.C., and /SLAC. Solid-State Modulators for RF And Fast Kickers. United States: N. p., 2006. Web.
Cook, E.G., Akana, G.L., Gower, E.J., Hawkins, S.A., Hickman, B.C., /LLNL, Livermore, Brooksby, C.A., /NONE - BECHTEL NEVADA LAS VEGAS, Cassel, R.L., de Lamare, J.E., Nguyen, M.N., Pappas, G.C., & /SLAC. Solid-State Modulators for RF And Fast Kickers. United States.
Cook, E.G., Akana, G.L., Gower, E.J., Hawkins, S.A., Hickman, B.C., /LLNL, Livermore, Brooksby, C.A., /NONE - BECHTEL NEVADA LAS VEGAS, Cassel, R.L., de Lamare, J.E., Nguyen, M.N., Pappas, G.C., and /SLAC. Tue . "Solid-State Modulators for RF And Fast Kickers". United States. doi:. https://www.osti.gov/servlets/purl/877443.
@article{osti_877443,
title = {Solid-State Modulators for RF And Fast Kickers},
author = {Cook, E.G. and Akana, G.L. and Gower, E.J. and Hawkins, S.A. and Hickman, B.C. and /LLNL, Livermore and Brooksby, C.A. and /NONE - BECHTEL NEVADA LAS VEGAS and Cassel, R.L. and de Lamare, J.E. and Nguyen, M.N. and Pappas, G.C. and /SLAC},
abstractNote = {As the switching capabilities of solid-state devices increase, these devices are being incorporated into modulator designs for high voltage accelerator applications. Solid-state modulators based on inductive adder circuit topology have demonstrated great versatility with regard to pulse width and pulse repetition rate while maintaining fast pulse rise and fall times. Additionally, these modulators are capable of being scaled to higher output voltage and power levels. An explanation of the basic circuit operation will be presented as well as test data of several different hardware systems.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Mar 14 00:00:00 EST 2006},
month = {Tue Mar 14 00:00:00 EST 2006}
}

Conference:
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  • As the switching capabilities of solid-state devices increase, these devices are being incorporated into modulator designs for high voltage accelerator applications. Solid-state modulators based on inductive adder circuit topology have demonstrated great versatility with regard to pulse width and pulse repetition rate while maintaining fast pulse rise and fall times. Additionally, these modulators are capable of being scaled to higher output voltage and power levels. An explanation of the basic circuit operation will be presented as well as test data of several different hardware systems.
  • A solid-state modulator with very fast rise and fall times, pulse width agility, and multi-pulse burst and intra-pulse amplitude adjustment capability for use with high speed electron beam kickers has been designed and tested at LLNL. The modulator uses multiple solid-state modules stacked in an inductive-adder configuration. Amplitude adjustment is provided by controlling individual modules in the adder, and is used to compensate for transverse e-beam motion as well as the dynamic response and beam-induced steering effects associated with the kicker structure. A control algorithm calculates a voltage based on measured e-beam displacement and adjusts the modulator to regulate beammore » centroid position. This paper presents design details of amplitude control along with measured performance data from kicker operation on the ETA-II accelerator at LLNL.« less
  • An all solid-state modulator with multi-pulse burst capability, very fast rise and fall times, pulse width agility, and amplitude modulation capability for use with high-speed beam kickers has been designed and tested at LLNL. The modulator uses multiple solid-state modules stacked in an inductive-adder configuration. It provides a nominal 18kV pulse with {+-} 10% amplitude modulation on the order of several MHz, rise times on the order of 10nS, and can be configured for either positive or negative polarity. The presentation will include measured performance data.
  • In order to exploit the full potential of the Advanced Hydrodynamic Facility (AHF) facility to produce a time sequence of proton transmission radiographs throughout the dynamic event, a kicker/modulator for extraction from the 50 GeV ring that is capable of generating a string of 25 pulse pairs at arbitrary times within a total time duration of 100 microseconds or more is desired. The full range of desired pulse-train requirements cannot be met with the commonly used pulse-forming cables or networks (PFNs) switched with thyratrons. The preferred modulator design approach at present is a transformer voltage-adder concept with primary-side pulses formedmore » with MOSFET-switched capacitors. This modulator will be a scale-up of an existing modulator that has been developed by Lawrence Livermore National Laboratory for use in DARHT, an electron induction accelerator facility at Los Alamos National Laboratory. Before the voltage-adder concept can be adopted for use in AHF, a working prototype that meets the AHF requirements for the pulse voltage, current, rise and fall time, and total pulse number must be built and tested. Additional requirements for pulse-to-pulse flattop height variation and baseline shift must also be met. A development and testing plan for the voltage-adder kicker modulator for AHF is described.« less