Title :
Hot phase velocity measurements and modeling for a broad band TWT
Author :
Converse, M. ; Singh, A. ; Scharer, J. ; Wirth, M. ; Bhattacharjee, S. ; Booske, J. ; Armstrong, C.
Author_Institution :
Wisconsin Univ., Madison, WI, USA
Abstract :
Summary form only given. We have made measurements of and modelled cold and hot phase velocities for the custom-made XWING broadband traveling wave tube. The TWT used in this investigation, termed the XWING TWT (for experimental Wisconsin Northrop Grumman TWT), is a research version of a product manufactured by Northrop Grumman. This two-stage, helical TWT provides a moderate gain of 20-30 dB over a frequency range of 2-6 GHz. The second stage of this TWT is configured with sensors placed at various points along the axis of the tube. These sensors allow the measurement of wave amplitude and phase to be made at a number of points along the axis, yielding additional wave evolution information not readily obtained from other TWTs, whose only wave information is available at the input and output of the device. By capturing the signal from two of these sensors, we have measured the cold and hot phase velocities in the 2-6 GHz range.
Keywords :
electric sensing devices; electronic equipment testing; phase measurement; travelling wave tubes; 2 to 6 GHz; 20 to 30 dB; TWT gain; TWT input; TWT output; XWING TWT; XWING broadband traveling wave tube; broadband TWT; cold phase velocity measurements; cold phase velocity modeling; frequency range; hot phase velocity measurements; hot phase velocity modeling; second stage sensors; tube axis; two-stage helical TWT; wave amplitude; wave evolution; wave phase; Distributed parameter circuits; Equations; Frequency; Gain; Manufacturing; Phase measurement; Predictive models; Propagation constant; Transmission line theory; Velocity measurement;
Conference_Titel :
Vacuum Electronics Conference, 2002. IVEC 2002. Third IEEE International
Print_ISBN :
0-7803-7256-5
DOI :
10.1109/IVELEC.2002.999327
