Hybrid design optimization of high voltage pulse transformers for Klystron modulators

This paper presents a generic hybrid optimization methodology based on space mapping techniques for the design of various high voltage pulse transformer structures used in klystron modulators. It is using two dimensioning models with different levels of complexity: a coarse model based on 2D FEA less accurate but cheaper to evaluate and a fine 3D FEA model more accurate but time consuming. A specific correction mechanism is applied to align the 2D FEA dimensioning model with the more accurate 3D FEA dimensioning model. With a suitable selection of the correction factors, the convergence of this hybrid optimal design methodology is obtained with a limited number of time consuming 3D FEA simulations. The method is applied to the optimal design of a monolithic high voltage pulse transformer for the CLIC klystron modulator. The influence of the klystron operating voltage on the size of the optimal pulse transformer is evaluated with the proposed design methodology.

[1]  Philippe Viarouge,et al.  Influence of the magnetic model accuracy on the optimal design of a car alternator , 2008 .

[2]  A. E. Mouatasim.  Reduced Gradient Method and its Generalization via Stochastic Perturbation , 2008 .

[3]  J. W. Kolar,et al.  Design procedure for compact pulse transformers with rectangular pulse shape and fast rise times , 2010, 2010 IEEE International Power Modulator and High Voltage Conference.

[4]  F. Bellina,et al.  Automated optimal design techniques for inverse electromagnetic problems , 1992 .

[5]  M. R. Feyzi,et al.  Optimal winding design of a pulse transformer considering parasitic capacitance effect to reach best rise time and overshoot , 2014, IEEE Transactions on Dielectrics and Electrical Insulation.

[6]  A. Pokryvailo,et al.  Comparison of the dielectric strength of transformer oil under DC and repetitive multimillisecond pulses , 2012, IEEE Electrical Insulation Magazine.

[7]  Philippe Viarouge,et al.  Finite element based optimal design approach for high voltage pulse transformers , 2013, 2013 19th IEEE Pulsed Power Conference (PPC).

[8]  T. Antonsen,et al.  High-power four-cavity S-band multiple-beam klystron design , 2004, IEEE Transactions on Plasma Science.

[9]  J.W. Kolar,et al.  Analytical Modeling of Pulse Transformers for Power Modulators , 2006, Conference Record of the 2006 Twenty-Seventh International Power Modulator Symposium.

[10]  P. Viarouge,et al.  Klystron modulator technology challenges for the Compact Linear Collider (CLIC) , 2011, 2011 IEEE Pulsed Power Conference.

[11]  P. Viarouge,et al.  Modeling and dimensioning of High Voltage pulse transformers for klystron modulators , 2012, 2012 XXth International Conference on Electrical Machines.

[12]  Leon S. Lasdon,et al.  Design and Testing of a Generalized Reduced Gradient Code for Nonlinear Programming , 1978, TOMS.

[13]  Philippe Viarouge,et al.  Finite Elements based optimal design approach for high voltage pulse transformers , 2013, 2013 Abstracts IEEE International Conference on Plasma Science (ICOPS).

[14]  Andrew H. Seltzman,et al.  Design and modeling of nanocrystalline iron core resonant transformers for pulsed power applications , 2013, IEEE Transactions on Dielectrics and Electrical Insulation.