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TY - CONF AU - Othman, M.A.K. AU - Dolgashev, V.A. AU - Haase, A.A. AU - Jawla, S. AU - Nanni, E.A. AU - Neilson, J. AU - Picard, J.F. AU - Schaub, S.C. AU - Spataro, B. AU - Tantawi, S.G. AU - Temkin, R.J. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Initial Results of High-Gradient Breakdown Tests for W-Band Accelerating Structures J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Emerging accelerator technology at mm-wave and THz frequencies has recently shown notable progress. Indeed, metallic and dielectric accelerating structures at THz frequencies are plausible candidates toward miniaturization of accelerators. RF breakdown in such structures is a major factor limiting their performance. Therefore, comprehensive analysis of RF breakdown physics in mm-wave accelerating structures is needed, which includes understanding of dependencies of the breakdown rate on geometric, electromagnetic and material properties. In this work we report on high power tests of a 110 GHz single-cell standing wave accelerating structure powered by a 1 MW gyrotron. The RF power is coupled from the gyrotron into the accelerating structure with a Gaussian to TM01 mode converter through a quasi-optical setup. We demonstrate coupling of 10 ns, 100s of kilowatt pulses into the structure using a fast switch and achieving ~150 MV/m accelerating gradients. Measurements of RF signals and field-emitted currents allow for complete comprehensive of the high-gradient behavior of W-band structures, including breakdown probability. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3769 EP - 3771 KW - cavity KW - experiment KW - electron KW - laser KW - vacuum DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPGW080 UR - http://jacow.org/ipac2019/papers/thpgw080.pdf ER -