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Design of an injector and LEBT for the AAA (Advanced Accelerator Applications) accelerator is based on the LEDA (Low-Energy Demonstration Accelerator) injector. This injector uses a microwave-driven generator to produce 75-keV, 110-mA DC and pulsed proton beams. The low-energy beam transport system (LEBT), comprised of two solenoid magnets and two steering magnets, delivers the beam to the RFQ match point. The LEDA injector has demonstrated 98% availability while operating at design parameters; however, it was not designed to minimize down time for maintenance, a critical consideration for AAA. Since the injector ion source and high-voltage column are the components most likely to degrade, the AAA injector ion source and high voltage column are designed to be removed and replaced as a unit without disturbing the LEBT components. The injector can be returned to full-current operation within 45 minutes. The AAA LEBT contains a plunging beam stop, a variable control iris for proportional beam current control, and has provision for installation of a beam kicker. It is designed to be capable of replacement and return to full operation in less than four hours. |
