Bidirectional Coupler Optimization in Wr284-Type Waveguide

TL Smith,G Waldschmidt,A Grelick,S Berg

PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5（2003）

Argonne Natl Lab

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摘要

In the Advanced Photon Source linac gun test area at Argonne National Laboratory a new S-band ballistic bunch compression (BBC) gun is being tested. It was determined that a WR 284 waveguide bidirectional coupler with a directivity of greater than 30 dB and a coupling of -57 /spl plusmn/ 1 dB was desired for evaluation of waveguide rf power conditions. Numerical simulations were performed using the High Frequency Structure Simulator (HFSS) and experimental models were built to determine the optimal dimensions of the bidirectional coupler assembly and the orientation of the loop coupler element. Magnetic and electric fields in the coupler were adjusted by modifying the coupling of the fields as well as the capacitance of the coupling loop.

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关键词

accelerator RF systems,beam handling techniques,electron accelerators,electron guns,linear accelerators,particle beam bunching,particle beam diagnostics,particle beam dynamics,waveguides,Advanced Photon Source linac gun test area,S-band ballistic bunch compression gun,WR 284 waveguide bidirectional coupler optimization,bidirectional coupler assembly,coupling loop capacitance,electric field,high frequency structure simulator,loop coupler element,magnetic field,optimal dimensions,waveguide rf power conditions