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Title: Compact rf polarizer and its application to pulse compression systems

We present a novel method of reducing the footprint and increasing the efficiency of the modern multi-MW rf pulse compressor. This system utilizes a high power rf polarizer to couple two circular waveguide modes in quadrature to a single resonant cavity in order to replicate the response of a traditional two cavity configuration using a 4-port hybrid. The 11.424 GHz, high-Q, spherical cavity has a 5.875 cm radius and is fed by the circularly polarized signal to simultaneously excite the degenerate TE 114 modes. The overcoupled spherical cavity has a Q 0 of 9.4×10 4 and coupling factor (β) of 7.69 thus providing a loaded quality factor Q L of 1.06×10 4 with a fill time of 150 ns. Cold tests of the polarizer demonstrated good agreement with the numerical design, showing transmission of -0.05 dB and reflection back to the input rectangular WR 90 waveguide less than -40 dB over a 100 MHz bandwidth. This novel rf pulse compressor was tested at SLAC using XL-4 Klystron that provided rf power up to 32 MW and generated peak output power of 205 MW and an average of 135 MW over the discharged signal. A general network analysis of the polarizermore » is discussed as well as the design and high power test of the rf pulse compressor.« less
Authors:
 [1] ;  [1] ;  [1] ;  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams (Online)
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams (Online); Journal Volume: 19; Journal Issue: 6; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION
OSTI Identifier:
1257673
Alternate Identifier(s):
OSTI ID: 1280816

Franzi, Matthew, Wang, Juwen, Dolgashev, Valery, and Tantawi, Sami. Compact rf polarizer and its application to pulse compression systems. United States: N. p., Web. doi:10.1103/PhysRevAccelBeams.19.062002.
Franzi, Matthew, Wang, Juwen, Dolgashev, Valery, & Tantawi, Sami. Compact rf polarizer and its application to pulse compression systems. United States. doi:10.1103/PhysRevAccelBeams.19.062002.
Franzi, Matthew, Wang, Juwen, Dolgashev, Valery, and Tantawi, Sami. 2016. "Compact rf polarizer and its application to pulse compression systems". United States. doi:10.1103/PhysRevAccelBeams.19.062002.
@article{osti_1257673,
title = {Compact rf polarizer and its application to pulse compression systems},
author = {Franzi, Matthew and Wang, Juwen and Dolgashev, Valery and Tantawi, Sami},
abstractNote = {We present a novel method of reducing the footprint and increasing the efficiency of the modern multi-MW rf pulse compressor. This system utilizes a high power rf polarizer to couple two circular waveguide modes in quadrature to a single resonant cavity in order to replicate the response of a traditional two cavity configuration using a 4-port hybrid. The 11.424 GHz, high-Q, spherical cavity has a 5.875 cm radius and is fed by the circularly polarized signal to simultaneously excite the degenerate TE114 modes. The overcoupled spherical cavity has a Q0 of 9.4×104 and coupling factor (β) of 7.69 thus providing a loaded quality factor QL of 1.06×104 with a fill time of 150 ns. Cold tests of the polarizer demonstrated good agreement with the numerical design, showing transmission of -0.05 dB and reflection back to the input rectangular WR 90 waveguide less than -40 dB over a 100 MHz bandwidth. This novel rf pulse compressor was tested at SLAC using XL-4 Klystron that provided rf power up to 32 MW and generated peak output power of 205 MW and an average of 135 MW over the discharged signal. A general network analysis of the polarizer is discussed as well as the design and high power test of the rf pulse compressor.},
doi = {10.1103/PhysRevAccelBeams.19.062002},
journal = {Physical Review Accelerators and Beams (Online)},
number = 6,
volume = 19,
place = {United States},
year = {2016},
month = {6}
}