Novel, Laser-Based Probe for Measuring Neutral Densities in Tokamak Plasmas

Award Information
Agency: Department of Energy
Branch: N/A
Contract: DE-FG02-04ER83974
Agency Tracking Number: 75424S04-I
Amount: $99,971.00
Phase: Phase I
Program: SBIR
Awards Year: 2004
Solicitation Year: 2004
Solicitation Topic Code: 1
Solicitation Number: DOE/SC-0075
Small Business Information
104 Centre Court, Radford Industrial Center, Radford, VA, 24141
HUBZone Owned: Y
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Robert Hazelton
 (540) 639-4019
Business Contact
 Robert Hazelton
Title: Dr.
Phone: (540) 639-4019
Research Institution
75424-Neutral species play important roles in many aspects of the operation of tokamak fusion reactors, including divertor operation, particle recycling, and edge turbulence effects. Diagnostics are required to quantitatively determine the state of neutral species, including their densities, temperatures, and directed velocities. However, current diagnostics are difficult to absolutely calibrate and suffer from the lack of spatial resolution. This project will develop a resonant, heterodyne interferometer to measure chordal, ground state densities of various neutral transitions including H(, D(, and T(. In Phase I, the interferometer will be designed, fabricated, and tested with in-house plasma sources. The critical issues are to demonstrate device operation with a tunable laser source, to optimize immunity to environmental noise (i.e., vibrational effects), and to demonstrate a capability to make meaningful measurements in plasmas akin to tokamak plasmas. In Phase II, the instrument will be installed and operated on the Alcator Cmod tokamak. Commercial Applications and Other Benefits as described by the awardee: In addition to the fusion energy application, the resonant interferometer should be robust enough for an industrial setting and would be an ideal sensor to monitor and control the plasma deposition of metal/diamond-like-carbon coatings, used to reduce friction, reduce wear, extend service life and improve the reliability of automotive components.

* Information listed above is at the time of submission. *

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