Advanced ICRF Antennas for Fusion Energy Devices

Award Information
Agency:
Department of Energy
Branch
n/a
Amount:
$1,000,000.00
Award Year:
2011
Program:
SBIR
Phase:
Phase II
Contract:
DE-FG02-10ER85971
Award Id:
n/a
Agency Tracking Number:
94301
Solicitation Year:
2011
Solicitation Topic Code:
67 b
Solicitation Number:
DE-FOA-0000508
Small Business Information
4914 Moores Mill Road, Huntsville, AL, 35811-1558
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
799114574
Principal Investigator:
John O'Dell
Mr.
(256) 851-7653
scottodell@plasmapros.com
Business Contact:
Angela Hattaway
Miss.
(256) 851-7653
ahattaway@plasmapros.com
Research Institution:
Stub




Abstract
Abstract Ion cyclotron range of frequency (ICRF) power is anticipated to be a primary auxiliary heating source in next step tokamak experiments like ITER. From a technological perspective, electrical breakdown is a significant challenge for ICRF utilization in present experiments and will become more challenging for future devices like ITER and other reactors. An ICRF system utilizes an antenna to couple power to the plasmas. Current antennas use materials with high conductivity, like copper, where the copper has been deposited onto a structural material like Inconel 625 or stainless steel. However, coppers low melting temperature and deteriorating mechanical properties at elevated temperatures result in electrical breakdown of the antenna and strong material displacement. ICRF antenna performance could be significantly improved by replacing the copper coating with a refractory metal such as tungsten. During this investigation, innovative coating techniques are being developed to enable the deposition of dense, high purity, well-adhered tungsten coatings on ICRF antennas. Testing of tungsten coatings produced during the Phase I effort has shown considerable promise. For example, electrical breakdown testing of tungsten coated samples at MIT has shown up to a 35% improvement in power handling capability as compared to copper reference samples with a similar surface finish. During Phase II, the tungsten coatings will be optimized and a tungsten coated ICRF antenna will be produced and tested in Alcator C-Mod to determine antenna performance in a tokamak environment. The antenna & apos;s voltage and power limits under various conditions will be characterized and compared to a traditionally copper coated antenna. Commercial Applications and Other Benefits: The development of dense, well-bonded refractory metal coatings on Inconel and stainless steel substrates will enable the fabrication of advanced ICRF antennas. Other applications that will benefit from the technology to be developed include aerospace, defense, propulsion, power generation, semiconductor, crucibles, heat shields, x-ray and sputtering targets, wear and corrosion protection coatings.

* information listed above is at the time of submission.

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