  Spectroscopy of antihydrogen has the potential to yield high-precision tests
of the CPT theorem and shed light on the matter-antimatter imbalance in the
Universe. The ALPHA antihydrogen trap at CERN's Antiproton Decelerator aims to
prepare a sample of antihydrogen atoms confined in an octupole-based Ioffe trap
and to measure the frequency of several atomic transitions. We describe our
techniques to directly measure the antiproton temperature and a new technique
to cool them to below 10 K. We also show how our unique position-sensitive
annihilation detector provides us with a highly sensitive method of identifying
antiproton annihilations and effectively rejecting the cosmic-ray background.
