[en] H^- ions are injected into the SSC boosters and main ring at a energy of 600 MeV by means of a three stage injector. It is composed of a RF quadrupole, a drift tube Linac, both operated in UHF-band, and a coupled cavity Linac operated in L-band at the third harmonic of the two first stages. These Linacs are powered by two types of klystron, and their procurement contracts were awarded to Thomson Tubes Electroniques in October 1991. A design review held in January 1992 finalized the proposed design and fixed the final details concerning the operation and specifications of the tubes optimized for SSC requirements. Since November 1992, the commissioning of both type of klystrons has been underway and several tubes of each type have so far been accepted in accordance with the tight contractual schedule. It is expected that all deliveries will be completed by the end of 1993

[en] A report is given of the design, development and production of power grid, klystron and gyrotron electron tubes required for RF plasma heating. (U.K.)

[en] Recent advances in accelerator technology are now making possible the operation of high duty factor or CW facilities. Emphasis is therefore frequently put on accelerators designed not only on purely technical factors, but also on cost criteria. From this point of view, the efficiency of high power RF sources feeding the electromagnetic power to the accelerating structures becomes an important issue in the design of a modern accelerator. It is thus important to consider the efficiency of high power RF sources in a very objective manner and to examine advantages and drawbacks for each possible RF generator. The objective of this paper is to give a broad survey of this issue and to clarify this performance and its consequences