The Quadrupole-Ioffe Configuration (QUIC) consists of two
quadrupole coils and Ioffe coil, with current directins shown by
the black arrows in the picture below.
The magnetic fields of the Ioffe coil and the quadrupole pair are
in the opposite direction on the z axis, so that they almost
cancel. If the currents in all the coils are equal then the design
of the coil geometry means a harmonic single well exists.
If the Ioffe coil current is less than that of the quadrupole pair
a double-well potential is created.
Atoms are lost at the two field zeros, where their spin-state can
change in the absence of a quantisation axis. We add a magnetic
field in the y-z plane so that the the zero-field position is
displaced outside the cloud, and rotate that field faster than the
atoms can move towards the zero. A time-averaged pseudo-potential
is the result. There are two harmonic wells with non-zero minima.
Next: Photo of the QUIC trap
Up: Creating a magnetic double-well potential
Previous: Creating a magnetic double-well potential
nk
2004-11-02
Next: Photo of the QUIC trap
![\includegraphics[width=0.75\columnwidth, clip]{C:/webpage/figs/dtopch.eps}](img3.gif)