  Multistage Zeeman deceleration is a technique used to reduce the velocity of
neutral molecules with a magnetic dipole moment. Here we present a Zeeman
decelerator that consists of 100 solenoids and 100 magnetic hexapoles, that is
based on a short prototype design presented recently [Phys. Rev. A 95, 043415
(2017)]. The decelerator features a modular design with excellent thermal and
vacuum properties, and is robustly operated at a 10 Hz repetition rate. This
multistage Zeeman decelerator is particularly optimized to produce molecular
beams for applications in crossed beam molecular scattering experiments. We
characterize the decelerator using beams of atomic and molecular oxygen. For
atomic oxygen, the magnetic fields produced by the solenoids are used to tune
the final longitudinal velocity in the 500 - 125 m/s range, while for molecular
oxygen the velocity is tunable in the 350 - 150 m/s range. This corresponds to
a maximum kinetic energy reduction of 95% and 80% for atomic and molecular
oxygen, respectively.
