Also, magnetic sheaths have been experimentally studied and compared with theory.

Electron cyclotron measurements with the fastscanning heterodyne radiometer on the tokamak fusion test reactor Rev. Sci. Instrum. 57, 1974 (1986; 10.1063/1.1138810 Fast scanning heterodyne receiver for the measurement of the time evolution of the electron temperature profile on the Tokamak Fusion Test Reactor Rev. Sci. Instrum. 56, 928 (1985); A fastscanning heterodyne receiver for measurement of the electron cyclotron emission from hightemperature plasmas Rev. Sci. Instrum. 50, 949 (1979);Two fast scanning heterodyne receivers, swept between 75-110 and 110-170 GHz in 2 ms every 4 ms, were developed to measure the electron cyclotron emission on the horizontal midplane of the Tokamak Fusion Test Reactor (TFTR) plasma. An absolute, in situ calibration technique enables the determination of the profile of the plasma electron temperature from the cyclotron emission intensity. The 4-ms repetition rate of the receiver allowed the resolution of "sawtooth" fluctuations of temperature, whose period was 10-100 ms, in profiles with central temperatures of 1-2.5 keY.

No abstract

DlsraBllTlOf CF THIS DQCJK37 iS tKiSSITEB MOTIC3 This report was prepared as an-account c£ work sponsored ay the Baited States Government. Neither the United Sea«s nor the cjnited States Deparraent :~ merry, ncr any of chair employe**, nor aay o£ their contractors, sobcc-tractors, or their employees, makes any warranty, express or fcnplifc;, or assumes any latfal liability or responsibility fcr the accuracy, completeness or usefulness or any inroraatioa. apparatus, product or process disclosed/ or represents that its use would not inrrir.94 esivately owned rights.

No abstract

Two fast scanning heterodyne receivers, swept between 75–110 and 110–170 GHz in 2 ms every 4 ms, were developed to measure the electron cyclotron emission on the horizontal midplane of the Tokamak Fusion Test Reactor (TFTR) plasma. An absolute, in situ calibration technique enables the determination of the profile of the plasma electron temperature from the fundamental ordinary mode and second harmonic extraordinary mode cyclotron emission intensity, with an accuracy of better than 10%. Temperature measurements made with the scanning receivers agree well with data from laser TV Thomson scattering and x-ray pulse-height analysis measurements. The time evolution of the temperature profile during temperature sawteeth fluctuations is well documented when the period of the fluctuation (30–100 ms) is much longer than the instrument sweep repetition time.

No abstract