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High Thermal Conductivity Aluminum Nitride-Based HOM Absorbers

Award Information

Department of Energy
Award ID:
Program Year/Program:
2008 / SBIR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
Solicitation Number:
Small Business Information
Sienna Technologies, Inc.
19501 144TH AVE NE SUITE F-500 Woodinville, WA 98072-4423
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Phase 1
Fiscal Year: 2008
Title: High Thermal Conductivity Aluminum Nitride-Based HOM Absorbers
Agency: DOE
Contract: DE-FG02-08ER85180
Award Amount: $100,000.00


A family of aluminum-nitride/silicon-carbide (AlN/SiC) composite lossy dielectrics are being developed to replace the toxic beryllia/silicon-carbide (BeO/SiC) composite lossy dielectrics as high order mode (HOM) absorbers in superconductor radio frequency (SRF) cavities in linear accelerators and in microwave tubes. Even though the dielectric properties of AlN/SiC composites match those of BeO/SiC composites, the low thermal conductivity of AlN/SiC composites has prevented their use in high power applications. This low thermal conductivity is caused by the formation of a solid solution between AlN and SiC at processing temperatures. This project will develop an approach to prevent the formation of this solid solution, which will result in a high thermal conductivity (=130 W/m-K), lossy AlN/SiC composite with repeatable thermal and electrical properties. In Phase I, the microstructures of the AlN/SiC composites will be characterized using advanced electron microscopy and electron probe microanalysis (EPMA). Prototype AlN/SiC composite HOM absorbers will be evaluated in the cavity by measuring the resonant frequency and cavity quality (Q) factor over the frequency of interest in the S-band. Commercial Applications and other Benefits as described by the awardee: An AlN-based HOM absorber with high thermal conductivity should be a viable product for use in linear particle accelerators, high power microwave tubes, space and satellite communications, and wireless communications.

Principal Investigator:

Ender Savrun

Business Contact:

Karen D. Valdastri
Small Business Information at Submission:

Sienna Technologies, Inc.
19501 144th Ave NE Suite F-500 Woodinville, WA 98072

EIN/Tax ID: 911724179
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No