A HYBRID REFLECTOMETER/ECE DIAGNOSTIC FOR ELECTRON DENSITY/TEMPERATURE MEASUREMENTS ON TOKAMAK FUSION PLASMAS.

THE TOKAMAK REPRESENTS THE MOST SUCCESSFUL FUSION DEVICE DEVELOPED TO DATE. HOWEVER, THE ADVENT OF RECENT TOKAMAK DEVICES, SUCH AS TFTR, JET, AND D111-D, TOGETHER WITH THEIR ASSOCIATED SUPPLEMENTARY HEATING SYSTEMS HAS HIGHLIGHTED THENEED FOR THE DEVELOPMENT OF DIAGNOSTIC SYSTEMS THAT PROVIDE MAXIMUM SPATIAL AND TEMPORAL INFORMATION OF PLASMA PARAMETERS SUCH AS NE(R), TE(R), AND E(R) ETC. WHILE OCCUPYING MINIMAL PORT SPACE. IN ADDITION, DIAGNOSTICSYSTEMS REQUIRED FOR MACHINES SUCH AS CIT OR ITER MUST BE RADIATION HARDENED OR CAPABLE OF REMOTE LOCATION. THE PRESENT PROPOSAL SEEKS TO DEVELOP A SINGLE DIAGNOSTIC SYSTEM TO MEASURE ON A SINGLE TOKAMAK DISCHARGE BOTH ELECTRON DENSITY AND TEMPERATURE PROFILES, AS WELL AS FLUCTUATIONS IN THESE QUANTITIES AT VARIOUS RADIAL LOCATIONS. THE SYSTEM WOULD COMBINE MANY OF THE DEMONSTRATED CAPABILITIES OF ELECTRON CYCLOTRON EMISSION (ECE) AND MILLIMETER-WAVE REFLECTOMETRY DIAGNOSTICS INTO A SINGLE HYBRID SYSTEM. PROFILE INFORMATION WOULD BE OBTAINEDBY OPERATING IN A FREQUENCY SWEPT MODE, WHEREAS LOCAL VARIATIONS IN TE AND NE WOULD BE ACHIEVED BY OPERATING AT A FIXED FREQUENCY. THE PHASE I RESEARCH PROGRAM WILL INVESTIGATE THE APPLICATION OF SUCH A HYBRID DIAGNOSTIC SYSTEM TO A VARIETY OF EXISTING AND PLANNED TOKAMAK DEVICES. CONCEPTUAL HARDWARE DESIGNS WILL BE GENERATED FOR VARIOUS EXISTING MAINLINE FUSION DEVICES. IN ADDITION, TECHNICAL DIFFICULTIES ASSOCIATED WITH OPERATION ON A MACHINE SUCH AS CIT WILL BE SPECIFICALLY ADDRESSED AND APPROPRIATE SOLUTIONSIDENTIFIED. PHASE II WOULD INVOLVE THE DETAILED DESIGN, CONSTRUCTION, TESTING AND INSTALLATION OF SUCH A SYSTEM ONTOA DESIGNATED TOKAMAK FUSION DEVICE IDENTIFIED DURING PHASE 1.