rfq

1
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
• Q 4000
• Longitudinal phase spread ??? 14
• Longitudinal energy spread ?W/W 1.5

Beam direction
RF