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

Award Information
Agency:
Department of Energy
Branch
n/a
Amount:
$495,000.00
Award Year:
1988
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Award Id:
7068
Agency Tracking Number:
7068
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
15 Ward St, Somerville, MA, 02143
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Dr Reich Watterson
(617) 547-1122
Business Contact:
() -
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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