RFQD - a Decelerating Radio Frequency Quadrupole for the CERN Antiproton Facility

The RFQD is designed to decelerate antiprotons of momentum 100 MeV/c (kinetic energy 5.33MeV)down to a kinetic energy variable between ~10 keV and 120 keV. Inside the RFQ body, at ground potential, the rf structure of the four-rod type is mounted on insulating supports. It can be biased between plus/minus 60 kV dc to achieve the continuous adjustment of output energy required by the ASACUSA experiment at the CERN Antiproton Decelerator AD. The different parts of the system are described and the present status reported

First operating experience with the CERN decelerating RFQ for antiprotons

The RFQD decelerates antiprotons from a momentum of 100 MeV/c (kinetic energy 5.31 MeV) down to a kinetic energy variable between ~10 keV and 120 keV. A novel feature is the implementation of a floating internal RF structure, mounted on HV insulators, to allow continuous post-deceleration or acceleration by a DC bias. A description of the system is given, followed by reports on the first operating experience with the ASACUSA experiment, dedicated performance measurements and consolidation progress

RELIABLE PRODUCTION OF MULTIPLE HIGH INTENSITY BEAMS WITH THE 500 MEV TRIUMF CYCLOTRON

In 2001, after 25 years of smooth cyclotron operation with up to 200 μAH− acceleration, developments towards higher intensities became compelling because of the ISAC expansion. Recently the goal of reliable total proton production current up to 300 μA, within a nominal∼90% duty cycle, was routinely achieved. Beam availability was 90- 94% over the last five years. Development highlights are discussed in the paperIMP;Chinese Academy of Science