QUAD 1-5b Rotating wall drive Nov 12, 2007

The QUAD 1-5b rotating wall drive is intended to create an electric rotating dipole or quadrupole field inside a Penning Ion Trap. The resulting “rotating wall” enables fast compression of big ion clouds.
The QUAD 1-5b is a suitable tool to handle a wide range of ions/plasma rotation frequencies with respect to this novel application. One can input a sinusoidal wave to the device, which maybe ramped in frequency for convenience, and the QUAD 1-5b will output an amplified 4-channel signal. All 4 channels have a precise relation of 90° and an equal amplitude, and therefore are suited to create a rotating electro-dynamical wall inside a cylindrical trap.
Since the outputs have a medium-impedance of nominally 350 Ohms and require no termination with 50 Ohms, the device is specially suited for ion traps, being located in vacuum setups, where usually no dedicated radio-frequency cables are used. Simple standard vacuum wire-cabling is therefore applicable.
The outputs can handle a very wide range of impedances and show practically under no conditions danger of oscillation in contrast to standard RF-amplifier outputs.
It is possible to add a constant DC-offset of up to +/-150V to all outputs simultaneously. This feature is specially useful with respect to ion traps, since one can float the attached trap electrodes on an arbitrary DC-potential within -150V … +150V, e.g. for ion trapping or ejection.

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