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rfq

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									                                                                    RFQ
    A Radio Frequency Quadrupole (RFQ) is favored for low
    energetic beams. It bunches, accelerates and focuses the ion beam.
    The 4-vane REXRFQ accelerates the radioactive ions with a
    charge-to-mass ratio larger than 1/4.5 from 5 keV/u to 300 keV/u.

• Theory
In principle an RFQ can be divided into
four sections: the radial matching section,
the shaper, the buncher, and the
accelerator section.

The 4-vane RFQ consists of four
electrodes, on which an alternating
voltage field is applied. The RF
quadrupole field provides transverse
focusing for the low energy ions while a
modulation of the spatial length of the
four rods performs smooth bunching of
the injected dc-beam and acceleration.
                                           • Data
                                           Energies Ein = 5 keV/u, Eout = 300 keV/u
                                           Tank length L = 3 m
                                           No. of cells: 232
                                           Electrode voltage Vrod = 42 kV
                                           Peak power consumption Wpeak = 53 kW
                                           Shunt impedance R = 100 km
Beam direction                             Q = 4000
                                           Longitudinal phase spread = ±14%
                         RF
                                           Longitudinal energy spread W/W = ±1.5%

								
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