Design and Simulations of Low Loss Single Disk RF Window

Shakir Ullah, M. Ayub, N. Aftab, A. Qayyum


This paper describe three simple designs of pillbox type S-band RF window for 2.5 MW peak power operation. In these designs alumina ceramic disk is used as RF transmitting medium, which is brazed with pill-box copper to create vacuum seal. Three different fabrication configurations of RF window are simulated using CST Microwave Studio. The simulation results for one of the designs are quite promising. At the working frequency of 2.998 GHz, the return loss S11 and transmission loss S21 are -72.75 dB and S21 is -0.009 respectively. The power loss at window is just 5.2 W, indicating that forced cooling of window is not required. PACS: 87.50.Jk; 84.40.Ba

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S. Michizono, Y.Saito, H. Mizuno and S. Yu. Kazakov, "High Power Test of Pill-Box and TW in Ceramic Type S-Band Windows", in Proceedings of the 17th International Linac Conference, LINAC94, Tsukuba, Japan, pp. 457-459, August 1994.

S. Michizono, Y. Saito, S. Yamaguchi, S. Anami, N. Matuda and A. Kinbara, "Dielectric materials for use as output window in high-power klystrons", IEEE Trans. Electr Insul., vol. 28, pp. 692-699, 1993.

M. K. Alaria, Y. Choyal and A. K. Sinha, "Design of Single disc RF window for High Power Gyrotron", Journal of Physics: Conference Series, vol. 365, pp. 012057, 2012.

A. D. Yerminian, V. A. Dolgashev and S. G. Tantawi, "High power S-band window optimized to electric and magnetic field on the surface", SLAC-PUB-15459, 2013.

S. Y. Kazakov, Presentation at LC93 Workshop, SLAC, Stanford University, Oct. 1993.

W. R. Fowkes, R. S. Callin, S. G. Tantawi and E. L. Wright, "Reduced Field TE01 X-band Traveling Wave Window", in PAC95, Dallas, pp. 1587-1589, May 1995.

W. R. Fowkes, R. S. Callin, E. N. Jongewaard and S. G. Tantawi, "Large Diameter Reduced Field TE01 Traveling Wave Window for X-band", in PAC99, New York, p. 785, March/April 1999.

O. S. Lamba, Debasish Pal, Dependra Kant, Tanima Girl, M. K. Verma, SC Nangru and L. M. Joshi, "Design and Optimization of Asymmetric RF Window for 6 MW Pulse Power S-band Klystron", IEEE Proc. Int Conf Microwaves, pp. 44-46, 2008. [9] Wikimedia Foundation Inc. "Kovar", Properties, [Online]. Available: [Accessed Aug. 18, 2016].

CRS Holdinds Inc. "Technical Datasheet", CarTech Kovar Alloy, [Online]. Available: [Accessed Nov. 28, 2016].

F. Gerigk, JM. Giguet, E. Montesinos, B. Riffaud, P. Ugena Tirado and R. Wegner, "The LINAC4 Power Coupler", in Proceedings of IPAC2011, San Sebastian, Spain, pp. 208-210, 2011.

J. Hillairet, J.Achard, Y.S.Bae, J.M.Bernard, N.Dechambre, L.Delpech, A.Ekedahl, N.Faure, M.Goniche, J.Kim, S.Larroque, R.Magne, L.Marfisi, W.Namkung, H.Park, S.Park, S.Poli and K.Vulliez ,"Design and tests of 500 kW RF windows for the ITER LHCD system", Fusion Engineering and Design, vol. 94, pp. 2230, 2015.


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