A NOVEL OPTICAL CONCEPT FOR RAPID SCANNING TWO-DIMENSIONAL THOMSON SCATTERING

Award Information
Agency: Department of Energy
Branch: N/A
Contract: N/A
Agency Tracking Number: 7068
Amount: $495,000.00
Phase: Phase II
Program: SBIR
Awards Year: 1988
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
15 Ward St, Somerville, MA, 02143
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Dr Reich Watterson
 (617) 547-1122
Business Contact
Phone: () -
Research Institution
N/A
Abstract
KNOWLEDGE OF THE ELECTRON TEMPERATURE AND DENSITY THROUGHOUT THE CROSS-SECTION OF A PLASMA FUSION DEVICE IS NEEDED FOR DETAILED UNDERSTANDING OF ITS PERFORMANCE. PRESENT THOMSON SCATTERING TECHNIQUES, WHICH EMPLOY A FIXED OPTICAL ARRANGEMENT, ARE CAPABLE OF PROVIDING SIMULTANEOUS MEASUREMENTS OF THE ELECTRON TEMPERATURE AND DENSITY AT MULTIPLE LOCATIONS ALONG A SINGLE PATH TRAVERSED BY A LASER BEAM THROUGH THE PLASMA. FUTURE NONCIRCULAR TOKAMAKS, SUCH AS ALCATOR C-MOD AND CTT (THE COMPACT IGNITION TOKAMAK), ARE EXPECTED TO HAVE ASYMMETRIC TEMPERATURE AND DENSITY PROFILES BUT TO BE OPERATED FOR LONG STEADY-STATE PERIODS. SWITCHING THE OPTICAL PATH TO BEFOLLOWED BY A 50-HZ ND:YAG LASER DURING THE 20-MSEC-PERIOD BETWEEN PULSES AND PROPERLY DESIGNING THE THOMSON SCATTERED LIGHT COLLECTION OPTICS WOULD ENABLE TWO-DIMENSIONAL ELECTRON TEMPERATURE AND DENSITY PROFILES TO BE DETERMINED WITHIN A SINGLE TOKAMAK DISCHARGE. A SYNCHRONOUSLY POSITIONED OPTICAL ELEMENT (E.G., A MIRROR) WOULD DIRECT THE BEAM ALONG SEPARATE, NEARLY VERTICAL CHORDS FOR SUCCESSIVE LASER PULSES. TECHNIQUES TO SIMULTANEOUSLY DIRECT THE LASER BEAM AND COLLECT THE SCATTERED LIGHT RELIABLY FROM A TWO-DIMENSIONAL ARRAY OF LOCATIONS USING A LIMITED NUMBER OF SPECTROMETERS WILL BE EVALUATED. IN ADDITION, IMPORTANT ISSUES THAT MUST BE CONSIDERED IN DESIGNING SPECTROMETERS FOR THE HIGH TEMPERATURES (5-10-KEV)EXPECTED IN NEXT-GENERATION TOKAMAKE WILL BE EVALUATED.

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

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