ELECTRON CYCLOTRON HEATING
There are now 10 tokamak experiments which have provided information on ECRH; a list is given. The results from these experiments show that, within the range of conditions used: (1) The absorption efficiency is generally > 60%. (2) The energy confinement during ECRH is consistent with E alpha n-ea2Te**alpha where -0.5 < alpha < 0.5. (3) In most experiments a fall in density occurs during heating, although this appears to be a broadening of the profile rather than loss of particles. (4) The efficiency, deposition profiles and cut-off effects are as expected from classical electromagnetic wave theory. (5) When heating at either w-ce or 2w-ce the electron distribution function remains Maxwellian for correctly chosen target plasma conditions. (6) There is clear evidence that local heating by ECRH leads to profile shape changes and a consequent change in mind behaviour. (7) The heating systems are reliable. Compared with other heating schemes ECRH is still a maturing technology and progress depends on the development of gyrotron sources. There is a need now for experiments with MW power levels. Experimental data are also required on current drive efficiency and the question of non-linear effects due to distortion of the distribution function at high power levels.
Bibliographic Reference: 2ND WORKSHOP EUROPEAN TOKAMAK PROGRAMME, SAULX-LES- CHARTREUX (FRANCE), NOV. 30-DEC. 2, 1983 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32870 ORA
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Record Number: 1989125008100 / Last updated on: 1987-01-01
Available languages: en