The RF System for the Accelerator Production of Tritium (APT) Low Energy Demonstration Accelerator (LEDA) at Los Alamos*

To develop and demonstrate the crucial front end of the APT accelerator and some of the critical components for APT, Los Alamos is building a CW proton accelerator (LEDA) to provide 100-mA at up to 40-MeV. LEDA will be installed where the SDI-sponsored Ground Test Accelerator (GTA) was located. The first accelerating structure for LEDA is a 7-MeV RFQ operating at 350-MHz. This is then followed by several stages of a coupled-cavity Drift Tube Linac (CCDTL) operating at 700-MHz. The first stage of LEDA will go to 12-MeV. Higher energies, up to 40-MeV, come later in the program. Three 1.2-MW CW RF systems will be used to provide power to the RFQ. This paper describes the RF systems being assembled for LEDA, including the 350 and 700-MHz klystrons, the High Voltage Power Supplies, the transmitters, the RF transport, the window/coupler assemblies, and the controls. Some of the limitations imposed by the schedule and the building itself will be addressed. APT System Overview The accelerator for APT is nominally configured at 1300 MeV, 100 mA, CW [1]. The accelerator layout uses an RFQ to accelerate to 7 MeV and a coupled-cavity, drift-tube linac (CCDTL) [2) to accelerate from 7 to 100 MeV. Above 100 MeV, a Coupled Cavity Linac (CCL) is the baseline structure, but consideration is also being given to a superconducting structure. In the room temperature configuration now planned, over 225 1-MW klystrons are required for the entire accelerator