Routine density profile measurements by AM reflectometer

First experiments with time delay measurements by the AM reflectometer were done on T-10 tokamak [1]. In experiments on TJ-1 [2] and PBX-M [3] plasma density profiles were reconstructed from time delay vs. frequency dependence measured by AM reflectometers. On PBX-M density profiles were compared with density profiles measured by the laser beam scattering diagnostic. The comparison had shown no noticeable difference between results of two diagnostics. Now the AM reflectometer for routine density profile measurements with high spatial resolution is put into operation on the T-10 tokamak. The scheme and main parameters of the T-10 AM reflectometer are the same as parameters of reflectometers [2,3]: the accuracy of the time delay measurements is 0.06 nanoseconds, that is 1.5 % on the period of amplitude modulation 4 nanoseconds, that defines the absolute spatial accuracy (accuracy of calibration) about 0.9 cm; the frequency range for the time delay changes is 50 kHz (about 10 microseconds time resolution). Two circular antennas with 18 mm diameter are used: emitting and receiving antennas are separate. The antennas are installed in the equatorial plane of the T-10. Waveguides insid