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Title: Ka-Band NanoMPM.


Abstract not provided.

Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the IVEC 2014 held April 22-24, 2014 in Monterey, CA.
Country of Publication:
United States

Citation Formats

Dubbert, Dale F. Ka-Band NanoMPM.. United States: N. p., 2014. Web.
Dubbert, Dale F. Ka-Band NanoMPM.. United States.
Dubbert, Dale F. Tue . "Ka-Band NanoMPM.". United States. doi:.
title = {Ka-Band NanoMPM.},
author = {Dubbert, Dale F.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 01 00:00:00 EDT 2014},
month = {Tue Apr 01 00:00:00 EDT 2014}

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  • AlGaAs/GaAs power HBTs have been developed for operation in the 26 GHz band. The HBTs were designed for improved thermal stability and power gain. A common-base HBT with a 480-{mu}m{sup 2} emitter area achieved a 0.65 W CW output power with 34% collector efficiency, 16% power-added efficiency, and 6 dB linear power gain at 26.85 GHz. A 960-{mu}m{sup 2} CB HBT produced an output power of 0.8 W with 5.6 dB linear power gain at 26.2 GHz.
  • A 35 GHz CHI (Coaxial Hybrid Iron) wiggler ubitron amplifier experiment is under construction at the Naval Research Laboratory. The purpose of the experiment is to study the CHI wiggler configuration`s potential of generating high wiggler magnetic fields at short periods with excellent beam focusing and transport properties. The nominal design parameters of the experiment are a center frequency of 35 GHz, wiggler period of 7.5 mm, and beam voltage of approximately 150 kV. Calculations have shown an intrinsic efficiency of {approx} 7% when operating at 6.3 kG axial field. There appears to be room for further improvement in efficiency,more » a matter that will be scrutinized more closely in the final design. Components of the experiments include a modified SLAC klystron electron gun (its beam converted from solid to annular), and the input and output rf couplers. Extensive work was performed on the design of the annular beam gun. In addition to the design of the components themselves, their placement in relation to each other in the gun-wiggler region is critical due to space limitation and beam transport issues. The techniques used for beam focusing were also used to study the transport of the beam from the gun output to the wiggler input. The input rf coupler being designed will be a broad band coupler, coupling between two or more rectangular waveguides into the coaxial TE{sub 01} interaction mode. The output coupler will be based on the same design. Results to date are reported.« less
  • Sandia National Laboratories designs and builds Synthetic Aperture Radar (SAR) systems capable of forming high-quality exceptionally fine resolution images. During the spring of 2004 a series of test flights were completed with a Ka-band testbed SAR on Sandia's DeHavilland DHC-6 Twin Otter aircraft. A large data set was collected including real-time fine-resolution images of a variety of target scenes. This paper offers a sampling of high quality images representative of the output of Sandia's Ka-band testbed radar with resolutions as fine as 4 inches. Images will be annotated with descriptions of collection geometries and other relevant image parameters.
  • The CERETRON microwave generator concept relies on the conversion of intense relativistic electron beam (REB) energy into highpower microwave emission through the Smith-Purcell effect. We report initial results from experiments with the production of Ka-band Smith-Purcell radiation generated by a 50-kA, 2.8-MeV beam propagated through a cylindrical transmission grating with lambda/sub 0/ = 1 cm. These experiments were performed without a quasi-optical resonator, and the output was limited by breakdown of the grating and by limited access through the 90-kG magnet coil. Nevertheless, the measured power output from these initial experiments was about 7 kW in the Ka band.
  • Two high power 35 GHz TWT amplifiers driven by a relativistic pencil, 850 kV, 200A electron beam have been assembled and tested. The first had a dielectric slow wave structure and was primarily used to develop diagnostics, and to gain experience in working with high power systems in Ka band. The source of the input power for the amplifier was a magnetron producing a 30 kW, 200ns long pulse of which 10 kW as delivered to the experiment. The 30 cm long dielectric (Teflon) amplifier produced output power levels of about 1 MW with a gain of about 23 dB.more » These results are consistent with expectations from PIC code simulations for this arrangement. The second amplifier, which is a single stage disk loaded slow wave structure, has been designed. It consists of one hundred uniform cells with two sets of ten tapered calls at the ends to lower the reflection coefficient. The phase advance per cell is {pi}/2. The amplifier passband extends from 28 to 40 GHz. It is designed to increase the output power to about 20 MW. The amplifier is in construction and will be tested in the near future. Details of the design of both systems will be provided and initial results from the new amplifier presented.« less