The Injection Kicker System of the CERN Antiproton Accumulator

The antiprotons produced at the target are deflected onto the injection orbit by a kicker magnet. The beam emittance demands a very large kicker aperture and bunch interval imposes a short fall-time of the field pulse. A movable fast shutter shields the stack space from pulsed stray field and permits a free passage from injection to stack orbit within each injection cycle. The ferrite delay-line kicker, the servodriven shutter and the ultra high vacuum (UHV) tanks are described. Pulsed magnetic field measurements and operating experience with this kicker system are also reported.