Analysis of operation of thyristor power supply system of the EhKU-6 ring electromagnet

In accordance with the program of reconstruction of the Erevan electron synchrotron at 6 GeV and to increase the stability of maanetic field parameters and the operational reliability of the power supply system the ignitron converters have been substituted by the thyristor ones. The thyristor rectifier is assembled on a three-phase bridge circuit utilizing high-voltage water-cooled thyristor modules. Every module consists of six series-connected thyristors. The thyristor mean current is 320 A, the mean current of the rectifier arm is 165 A. Under rated operating conditions of the accelerator the rectified voltage constitutes 4600 V, and the rectified current -330 A. The thyristor conve 330 A. The thyristor converter comprises four parallel branches of two series-connected modules each. The duration of the current pulse at a discharge is 2000 A, the mean discharge current is 125 A, the effective discharge current is 630 A. The tests of the thyristor power supply system demonstrate that the system is simple in operation, reliable, and provides a wide range of control of accelerated particle energies