Septum magnet for electron slow extraction from the Yerevan synchrotron

The Yerevan synchrotron modernization program foresees the increase of the slow extraction time first from 2 to 10 msec and then up to 20 msec for the 6 GeV electrons. Increasing of the extracted beam time requires more reliability of the septum magnet, because of the release of heat on the thin current sheet. The following technical points have been used in the operating septum magnet, which ensures extracted beam time only up to 2 msec. Magnetic circuit, current sheet and cooling system as well as horizontal tuning device are installed in the vacuum chamber of the accelerator. In this case magnet is becoming bulky, with a large number of communications in the vacuum chamber. The main feature of the recent developed septum magnet is that the magnetic circuit return conductor of excitation winding as well as the water communications are put out of the accelerator vacuum chamber. The tuning device is out of vacuum chamber too. The above mentioned technical points used in the given construction ensure high reliability, low gas emission into the vacuum chamber and simple operation