PLASMA POSITION CONTROL IN A TOKAMAK REACTOR AROUND IGNITION
The plasma position control in a Tokamak reactor in the igniting phase is strictly related to the control of the burn. The plasma position becomes however sensitive to the thermal instability already in the approaching phase to ignition. Moreover, cyclic stabilization schemes around ignition involve positional instability in the heating- cooling phases and the deviations may be cumulative in time. A reliable control of the plasma in pressure position (p,R) space is achieved by rigidly constraining beforehand the p,R trajectory with suitable feedback vertical field stabilization, established already below ignition. The stabilizing values of the gain coefficient and the associated p and R excursions are discussed both analytically, with a O-D approximation including nonlinearity, and numerically, with a 1-D code in cylindrical geometry. The profile effects increase the excursions, particularly above ignition.
Bibliographic Reference: WRITE TO INSTITUTO DI FISICA DEL PLASMA, ASSOCIAZIONE C.N.R.-EURATOM, VIA BASSINI, 15 20133 MILANO (ITALY), MENTIONING REPORT FP 85/1, 1985
Record Number: 1989123071000 / Last updated on: 1987-01-01
Available languages: en